1 \input texinfo @c -*- Texinfo -*-
2 @setfilename binutils.info
3 @c Copyright 2001, 2002 Free Software Foundation, Inc.
10 * Binutils: (binutils). The GNU binary utilities.
11 * ar: (binutils)ar. Create, modify, and extract from archives
12 * nm: (binutils)nm. List symbols from object files
13 * objcopy: (binutils)objcopy. Copy and translate object files
14 * objdump: (binutils)objdump. Display information from object files
15 * ranlib: (binutils)ranlib. Generate index to archive contents
16 * readelf: (binutils)readelf. Display the contents of ELF format files.
17 * size: (binutils)size. List section sizes and total size
18 * strings: (binutils)strings. List printable strings from files
19 * strip: (binutils)strip. Discard symbols
20 * c++filt: (binutils)c++filt. Filter to demangle encoded C++ symbols
21 * cxxfilt: (binutils)c++filt. MS-DOS name for c++filt
22 * addr2line: (binutils)addr2line. Convert addresses to file and line
23 * nlmconv: (binutils)nlmconv. Converts object code into an NLM
24 * windres: (binutils)windres. Manipulate Windows resources
25 * dlltool: (binutils)dlltool. Create files needed to build and use DLLs
31 @c man begin COPYRIGHT
32 Copyright @copyright{} 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002 Free Software Foundation, Inc.
34 Permission is granted to copy, distribute and/or modify this document
35 under the terms of the GNU Free Documentation License, Version 1.1
36 or any later version published by the Free Software Foundation;
37 with no Invariant Sections, with no Front-Cover Texts, and with no
38 Back-Cover Texts. A copy of the license is included in the
39 section entitled ``GNU Free Documentation License''.
43 Permission is granted to process this file through TeX and print the
44 results, provided the printed document carries a copying permission
45 notice identical to this one except for the removal of this paragraph
46 (this paragraph not being relevant to the printed manual).
53 @c This file documents the GNU binary utilities "ar", "ld", "objcopy",
54 @c "objdump", "nm", "size", "strings", "strip", "readelf" and "ranlib".
56 @c Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002 Free Software Foundation, Inc.
58 @c This text may be freely distributed under the terms of the GNU
59 @c Free Documentation License.
62 @setchapternewpage odd
63 @settitle @sc{gnu} Binary Utilities
66 @title The @sc{gnu} Binary Utilities
67 @subtitle Version @value{VERSION}
70 @author Roland H. Pesch
71 @author Jeffrey M. Osier
72 @author Cygnus Support
76 {\parskip=0pt \hfill Cygnus Support\par \hfill
77 \TeX{}info \texinfoversion\par }
80 @vskip 0pt plus 1filll
81 Copyright @copyright{} 1991, 92, 93, 94, 95, 96, 97, 1998, 2000, 2001, 2002 Free Software Foundation, Inc.
83 Permission is granted to copy, distribute and/or modify this document
84 under the terms of the GNU Free Documentation License, Version 1.1
85 or any later version published by the Free Software Foundation;
86 with no Invariant Sections, with no Front-Cover Texts, and with no
87 Back-Cover Texts. A copy of the license is included in the
88 section entitled ``GNU Free Documentation License''.
96 This brief manual contains documentation for the @sc{gnu} binary
97 utilities (collectively version @value{VERSION}):
102 Create, modify, and extract from archives
105 List symbols from object files
108 Copy and translate object files
111 Display information from object files
114 Generate index to archive contents
117 Display the contents of ELF format files.
120 List file section sizes and total size
123 List printable strings from files
129 Demangle encoded C++ symbols (on MS-DOS, this program is named
133 Convert addresses into file names and line numbers
136 Convert object code into a Netware Loadable Module
139 Manipulate Windows resources
142 Create the files needed to build and use Dynamic Link Libraries
146 This document is distributed under the terms of the GNU Free
147 Documentation License. A copy of the license is included in the
148 section entitled "GNU Free Documentation License".
151 * ar:: Create, modify, and extract from archives
152 * nm:: List symbols from object files
153 * objcopy:: Copy and translate object files
154 * objdump:: Display information from object files
155 * ranlib:: Generate index to archive contents
156 * readelf:: Display the contents of ELF format files.
157 * size:: List section sizes and total size
158 * strings:: List printable strings from files
159 * strip:: Discard symbols
160 * c++filt:: Filter to demangle encoded C++ symbols
161 * cxxfilt: c++filt. MS-DOS name for c++filt
162 * addr2line:: Convert addresses to file and line
163 * nlmconv:: Converts object code into an NLM
164 * windres:: Manipulate Windows resources
165 * dlltool:: Create files needed to build and use DLLs
166 * Selecting The Target System:: How these utilities determine the target.
167 * Reporting Bugs:: Reporting Bugs
168 * GNU Free Documentation License:: GNU Free Documentation License
177 @cindex collections of files
179 @c man title ar create, modify, and extract from archives
182 ar [-]@var{p}[@var{mod} [@var{relpos}] [@var{count}]] @var{archive} [@var{member}@dots{}]
183 ar -M [ <mri-script ]
186 @c man begin DESCRIPTION ar
188 The @sc{gnu} @command{ar} program creates, modifies, and extracts from
189 archives. An @dfn{archive} is a single file holding a collection of
190 other files in a structure that makes it possible to retrieve
191 the original individual files (called @dfn{members} of the archive).
193 The original files' contents, mode (permissions), timestamp, owner, and
194 group are preserved in the archive, and can be restored on
198 @sc{gnu} @command{ar} can maintain archives whose members have names of any
199 length; however, depending on how @command{ar} is configured on your
200 system, a limit on member-name length may be imposed for compatibility
201 with archive formats maintained with other tools. If it exists, the
202 limit is often 15 characters (typical of formats related to a.out) or 16
203 characters (typical of formats related to coff).
206 @command{ar} is considered a binary utility because archives of this sort
207 are most often used as @dfn{libraries} holding commonly needed
211 @command{ar} creates an index to the symbols defined in relocatable
212 object modules in the archive when you specify the modifier @samp{s}.
213 Once created, this index is updated in the archive whenever @command{ar}
214 makes a change to its contents (save for the @samp{q} update operation).
215 An archive with such an index speeds up linking to the library, and
216 allows routines in the library to call each other without regard to
217 their placement in the archive.
219 You may use @samp{nm -s} or @samp{nm --print-armap} to list this index
220 table. If an archive lacks the table, another form of @command{ar} called
221 @command{ranlib} can be used to add just the table.
223 @cindex compatibility, @command{ar}
224 @cindex @command{ar} compatibility
225 @sc{gnu} @command{ar} is designed to be compatible with two different
226 facilities. You can control its activity using command-line options,
227 like the different varieties of @command{ar} on Unix systems; or, if you
228 specify the single command-line option @option{-M}, you can control it
229 with a script supplied via standard input, like the MRI ``librarian''
235 * ar cmdline:: Controlling @command{ar} on the command line
236 * ar scripts:: Controlling @command{ar} with a script
241 @section Controlling @command{ar} on the Command Line
244 @c man begin SYNOPSIS ar
245 ar [@option{-X32_64}] [@option{-}]@var{p}[@var{mod} [@var{relpos}] [@var{count}]] @var{archive} [@var{member}@dots{}]
249 @cindex Unix compatibility, @command{ar}
250 When you use @command{ar} in the Unix style, @command{ar} insists on at least two
251 arguments to execute: one keyletter specifying the @emph{operation}
252 (optionally accompanied by other keyletters specifying
253 @emph{modifiers}), and the archive name to act on.
255 Most operations can also accept further @var{member} arguments,
256 specifying particular files to operate on.
258 @c man begin OPTIONS ar
260 @sc{gnu} @command{ar} allows you to mix the operation code @var{p} and modifier
261 flags @var{mod} in any order, within the first command-line argument.
263 If you wish, you may begin the first command-line argument with a
266 @cindex operations on archive
267 The @var{p} keyletter specifies what operation to execute; it may be
268 any of the following, but you must specify only one of them:
272 @cindex deleting from archive
273 @emph{Delete} modules from the archive. Specify the names of modules to
274 be deleted as @var{member}@dots{}; the archive is untouched if you
275 specify no files to delete.
277 If you specify the @samp{v} modifier, @command{ar} lists each module
281 @cindex moving in archive
282 Use this operation to @emph{move} members in an archive.
284 The ordering of members in an archive can make a difference in how
285 programs are linked using the library, if a symbol is defined in more
288 If no modifiers are used with @code{m}, any members you name in the
289 @var{member} arguments are moved to the @emph{end} of the archive;
290 you can use the @samp{a}, @samp{b}, or @samp{i} modifiers to move them to a
291 specified place instead.
294 @cindex printing from archive
295 @emph{Print} the specified members of the archive, to the standard
296 output file. If the @samp{v} modifier is specified, show the member
297 name before copying its contents to standard output.
299 If you specify no @var{member} arguments, all the files in the archive are
303 @cindex quick append to archive
304 @emph{Quick append}; Historically, add the files @var{member}@dots{} to the end of
305 @var{archive}, without checking for replacement.
307 The modifiers @samp{a}, @samp{b}, and @samp{i} do @emph{not} affect this
308 operation; new members are always placed at the end of the archive.
310 The modifier @samp{v} makes @command{ar} list each file as it is appended.
312 Since the point of this operation is speed, the archive's symbol table
313 index is not updated, even if it already existed; you can use @samp{ar s} or
314 @command{ranlib} explicitly to update the symbol table index.
316 However, too many different systems assume quick append rebuilds the
317 index, so @sc{gnu} @command{ar} implements @samp{q} as a synonym for @samp{r}.
320 @cindex replacement in archive
321 Insert the files @var{member}@dots{} into @var{archive} (with
322 @emph{replacement}). This operation differs from @samp{q} in that any
323 previously existing members are deleted if their names match those being
326 If one of the files named in @var{member}@dots{} does not exist, @command{ar}
327 displays an error message, and leaves undisturbed any existing members
328 of the archive matching that name.
330 By default, new members are added at the end of the file; but you may
331 use one of the modifiers @samp{a}, @samp{b}, or @samp{i} to request
332 placement relative to some existing member.
334 The modifier @samp{v} used with this operation elicits a line of
335 output for each file inserted, along with one of the letters @samp{a} or
336 @samp{r} to indicate whether the file was appended (no old member
337 deleted) or replaced.
340 @cindex contents of archive
341 Display a @emph{table} listing the contents of @var{archive}, or those
342 of the files listed in @var{member}@dots{} that are present in the
343 archive. Normally only the member name is shown; if you also want to
344 see the modes (permissions), timestamp, owner, group, and size, you can
345 request that by also specifying the @samp{v} modifier.
347 If you do not specify a @var{member}, all files in the archive
350 @cindex repeated names in archive
351 @cindex name duplication in archive
352 If there is more than one file with the same name (say, @samp{fie}) in
353 an archive (say @samp{b.a}), @samp{ar t b.a fie} lists only the
354 first instance; to see them all, you must ask for a complete
355 listing---in our example, @samp{ar t b.a}.
356 @c WRS only; per Gumby, this is implementation-dependent, and in a more
357 @c recent case in fact works the other way.
360 @cindex extract from archive
361 @emph{Extract} members (named @var{member}) from the archive. You can
362 use the @samp{v} modifier with this operation, to request that
363 @command{ar} list each name as it extracts it.
365 If you do not specify a @var{member}, all files in the archive
370 A number of modifiers (@var{mod}) may immediately follow the @var{p}
371 keyletter, to specify variations on an operation's behavior:
375 @cindex relative placement in archive
376 Add new files @emph{after} an existing member of the
377 archive. If you use the modifier @samp{a}, the name of an existing archive
378 member must be present as the @var{relpos} argument, before the
379 @var{archive} specification.
382 Add new files @emph{before} an existing member of the
383 archive. If you use the modifier @samp{b}, the name of an existing archive
384 member must be present as the @var{relpos} argument, before the
385 @var{archive} specification. (same as @samp{i}).
388 @cindex creating archives
389 @emph{Create} the archive. The specified @var{archive} is always
390 created if it did not exist, when you request an update. But a warning is
391 issued unless you specify in advance that you expect to create it, by
395 Truncate names in the archive. @sc{gnu} @command{ar} will normally permit file
396 names of any length. This will cause it to create archives which are
397 not compatible with the native @command{ar} program on some systems. If
398 this is a concern, the @samp{f} modifier may be used to truncate file
399 names when putting them in the archive.
402 Insert new files @emph{before} an existing member of the
403 archive. If you use the modifier @samp{i}, the name of an existing archive
404 member must be present as the @var{relpos} argument, before the
405 @var{archive} specification. (same as @samp{b}).
408 This modifier is accepted but not used.
409 @c whaffor ar l modifier??? presumably compat; with
410 @c what???---doc@@cygnus.com, 25jan91
413 Uses the @var{count} parameter. This is used if there are multiple
414 entries in the archive with the same name. Extract or delete instance
415 @var{count} of the given name from the archive.
418 @cindex dates in archive
419 Preserve the @emph{original} dates of members when extracting them. If
420 you do not specify this modifier, files extracted from the archive
421 are stamped with the time of extraction.
424 Use the full path name when matching names in the archive. @sc{gnu}
425 @command{ar} can not create an archive with a full path name (such archives
426 are not POSIX complaint), but other archive creators can. This option
427 will cause @sc{gnu} @command{ar} to match file names using a complete path
428 name, which can be convenient when extracting a single file from an
429 archive created by another tool.
432 @cindex writing archive index
433 Write an object-file index into the archive, or update an existing one,
434 even if no other change is made to the archive. You may use this modifier
435 flag either with any operation, or alone. Running @samp{ar s} on an
436 archive is equivalent to running @samp{ranlib} on it.
439 @cindex not writing archive index
440 Do not generate an archive symbol table. This can speed up building a
441 large library in several steps. The resulting archive can not be used
442 with the linker. In order to build a symbol table, you must omit the
443 @samp{S} modifier on the last execution of @samp{ar}, or you must run
444 @samp{ranlib} on the archive.
447 @cindex updating an archive
448 Normally, @samp{ar r}@dots{} inserts all files
449 listed into the archive. If you would like to insert @emph{only} those
450 of the files you list that are newer than existing members of the same
451 names, use this modifier. The @samp{u} modifier is allowed only for the
452 operation @samp{r} (replace). In particular, the combination @samp{qu} is
453 not allowed, since checking the timestamps would lose any speed
454 advantage from the operation @samp{q}.
457 This modifier requests the @emph{verbose} version of an operation. Many
458 operations display additional information, such as filenames processed,
459 when the modifier @samp{v} is appended.
462 This modifier shows the version number of @command{ar}.
465 @command{ar} ignores an initial option spelt @samp{-X32_64}, for
466 compatibility with AIX. The behaviour produced by this option is the
467 default for @sc{gnu} @command{ar}. @command{ar} does not support any of the other
468 @samp{-X} options; in particular, it does not support @option{-X32}
469 which is the default for AIX @command{ar}.
474 @c man begin SEEALSO ar
475 nm(1), ranlib(1), and the Info entries for @file{binutils}.
480 @section Controlling @command{ar} with a Script
483 ar -M [ <@var{script} ]
486 @cindex MRI compatibility, @command{ar}
487 @cindex scripts, @command{ar}
488 If you use the single command-line option @samp{-M} with @command{ar}, you
489 can control its operation with a rudimentary command language. This
490 form of @command{ar} operates interactively if standard input is coming
491 directly from a terminal. During interactive use, @command{ar} prompts for
492 input (the prompt is @samp{AR >}), and continues executing even after
493 errors. If you redirect standard input to a script file, no prompts are
494 issued, and @command{ar} abandons execution (with a nonzero exit code)
497 The @command{ar} command language is @emph{not} designed to be equivalent
498 to the command-line options; in fact, it provides somewhat less control
499 over archives. The only purpose of the command language is to ease the
500 transition to @sc{gnu} @command{ar} for developers who already have scripts
501 written for the MRI ``librarian'' program.
503 The syntax for the @command{ar} command language is straightforward:
506 commands are recognized in upper or lower case; for example, @code{LIST}
507 is the same as @code{list}. In the following descriptions, commands are
508 shown in upper case for clarity.
511 a single command may appear on each line; it is the first word on the
515 empty lines are allowed, and have no effect.
518 comments are allowed; text after either of the characters @samp{*}
519 or @samp{;} is ignored.
522 Whenever you use a list of names as part of the argument to an @command{ar}
523 command, you can separate the individual names with either commas or
524 blanks. Commas are shown in the explanations below, for clarity.
527 @samp{+} is used as a line continuation character; if @samp{+} appears
528 at the end of a line, the text on the following line is considered part
529 of the current command.
532 Here are the commands you can use in @command{ar} scripts, or when using
533 @command{ar} interactively. Three of them have special significance:
535 @code{OPEN} or @code{CREATE} specify a @dfn{current archive}, which is
536 a temporary file required for most of the other commands.
538 @code{SAVE} commits the changes so far specified by the script. Prior
539 to @code{SAVE}, commands affect only the temporary copy of the current
543 @item ADDLIB @var{archive}
544 @itemx ADDLIB @var{archive} (@var{module}, @var{module}, @dots{} @var{module})
545 Add all the contents of @var{archive} (or, if specified, each named
546 @var{module} from @var{archive}) to the current archive.
548 Requires prior use of @code{OPEN} or @code{CREATE}.
550 @item ADDMOD @var{member}, @var{member}, @dots{} @var{member}
551 @c FIXME! w/Replacement?? If so, like "ar r @var{archive} @var{names}"
552 @c else like "ar q..."
553 Add each named @var{member} as a module in the current archive.
555 Requires prior use of @code{OPEN} or @code{CREATE}.
558 Discard the contents of the current archive, canceling the effect of
559 any operations since the last @code{SAVE}. May be executed (with no
560 effect) even if no current archive is specified.
562 @item CREATE @var{archive}
563 Creates an archive, and makes it the current archive (required for many
564 other commands). The new archive is created with a temporary name; it
565 is not actually saved as @var{archive} until you use @code{SAVE}.
566 You can overwrite existing archives; similarly, the contents of any
567 existing file named @var{archive} will not be destroyed until @code{SAVE}.
569 @item DELETE @var{module}, @var{module}, @dots{} @var{module}
570 Delete each listed @var{module} from the current archive; equivalent to
571 @samp{ar -d @var{archive} @var{module} @dots{} @var{module}}.
573 Requires prior use of @code{OPEN} or @code{CREATE}.
575 @item DIRECTORY @var{archive} (@var{module}, @dots{} @var{module})
576 @itemx DIRECTORY @var{archive} (@var{module}, @dots{} @var{module}) @var{outputfile}
577 List each named @var{module} present in @var{archive}. The separate
578 command @code{VERBOSE} specifies the form of the output: when verbose
579 output is off, output is like that of @samp{ar -t @var{archive}
580 @var{module}@dots{}}. When verbose output is on, the listing is like
581 @samp{ar -tv @var{archive} @var{module}@dots{}}.
583 Output normally goes to the standard output stream; however, if you
584 specify @var{outputfile} as a final argument, @command{ar} directs the
588 Exit from @command{ar}, with a @code{0} exit code to indicate successful
589 completion. This command does not save the output file; if you have
590 changed the current archive since the last @code{SAVE} command, those
593 @item EXTRACT @var{module}, @var{module}, @dots{} @var{module}
594 Extract each named @var{module} from the current archive, writing them
595 into the current directory as separate files. Equivalent to @samp{ar -x
596 @var{archive} @var{module}@dots{}}.
598 Requires prior use of @code{OPEN} or @code{CREATE}.
601 @c FIXME Tokens but no commands???
608 Display full contents of the current archive, in ``verbose'' style
609 regardless of the state of @code{VERBOSE}. The effect is like @samp{ar
610 tv @var{archive}}. (This single command is a @sc{gnu} @command{ar}
611 enhancement, rather than present for MRI compatibility.)
613 Requires prior use of @code{OPEN} or @code{CREATE}.
615 @item OPEN @var{archive}
616 Opens an existing archive for use as the current archive (required for
617 many other commands). Any changes as the result of subsequent commands
618 will not actually affect @var{archive} until you next use @code{SAVE}.
620 @item REPLACE @var{module}, @var{module}, @dots{} @var{module}
621 In the current archive, replace each existing @var{module} (named in
622 the @code{REPLACE} arguments) from files in the current working directory.
623 To execute this command without errors, both the file, and the module in
624 the current archive, must exist.
626 Requires prior use of @code{OPEN} or @code{CREATE}.
629 Toggle an internal flag governing the output from @code{DIRECTORY}.
630 When the flag is on, @code{DIRECTORY} output matches output from
631 @samp{ar -tv }@dots{}.
634 Commit your changes to the current archive, and actually save it as a
635 file with the name specified in the last @code{CREATE} or @code{OPEN}
638 Requires prior use of @code{OPEN} or @code{CREATE}.
647 The @sc{gnu} linker @command{ld} is now described in a separate manual.
648 @xref{Top,, Overview,, Using LD: the @sc{gnu} linker}.
656 @c man title nm list symbols from object files
659 @c man begin SYNOPSIS nm
660 nm [@option{-a}|@option{--debug-syms}] [@option{-g}|@option{--extern-only}]
661 [@option{-B}] [@option{-C}|@option{--demangle}[=@var{style}]] [@option{-D}|@option{--dynamic}]
662 [@option{-S}|@option{--print-size}] [@option{-s}|@option{--print-armap}]
663 [@option{-A}|@option{-o}|@option{--print-file-name}]
664 [@option{-n}|@option{-v}|@option{--numeric-sort}] [@option{-p}|@option{--no-sort}]
665 [@option{-r}|@option{--reverse-sort}] [@option{--size-sort}] [@option{-u}|@option{--undefined-only}]
666 [@option{-t} @var{radix}|@option{--radix=}@var{radix}] [@option{-P}|@option{--portability}]
667 [@option{--target=}@var{bfdname}] [@option{-f}@var{format}|@option{--format=}@var{format}]
668 [@option{--defined-only}] [@option{-l}|@option{--line-numbers}] [@option{--no-demangle}]
669 [@option{-V}|@option{--version}] [@option{-X 32_64}] [@option{--help}] [@var{objfile}@dots{}]
673 @c man begin DESCRIPTION nm
674 @sc{gnu} @command{nm} lists the symbols from object files @var{objfile}@dots{}.
675 If no object files are listed as arguments, @command{nm} assumes the file
678 For each symbol, @command{nm} shows:
682 The symbol value, in the radix selected by options (see below), or
683 hexadecimal by default.
686 The symbol type. At least the following types are used; others are, as
687 well, depending on the object file format. If lowercase, the symbol is
688 local; if uppercase, the symbol is global (external).
690 @c Some more detail on exactly what these symbol types are used for
694 The symbol's value is absolute, and will not be changed by further
698 The symbol is in the uninitialized data section (known as BSS).
701 The symbol is common. Common symbols are uninitialized data. When
702 linking, multiple common symbols may appear with the same name. If the
703 symbol is defined anywhere, the common symbols are treated as undefined
706 For more details on common symbols, see the discussion of
707 --warn-common in @ref{Options,,Linker options,ld.info,The GNU linker}.
711 The symbol is in the initialized data section.
714 The symbol is in an initialized data section for small objects. Some
715 object file formats permit more efficient access to small data objects,
716 such as a global int variable as opposed to a large global array.
719 The symbol is an indirect reference to another symbol. This is a @sc{gnu}
720 extension to the a.out object file format which is rarely used.
723 The symbol is a debugging symbol.
726 The symbol is in a read only data section.
729 The symbol is in an uninitialized data section for small objects.
732 The symbol is in the text (code) section.
735 The symbol is undefined.
738 The symbol is a weak object. When a weak defined symbol is linked with
739 a normal defined symbol, the normal defined symbol is used with no error.
740 When a weak undefined symbol is linked and the symbol is not defined,
741 the value of the weak symbol becomes zero with no error.
744 The symbol is a weak symbol that has not been specifically tagged as a
745 weak object symbol. When a weak defined symbol is linked with a normal
746 defined symbol, the normal defined symbol is used with no error.
747 When a weak undefined symbol is linked and the symbol is not defined,
748 the value of the weak symbol becomes zero with no error.
751 The symbol is a stabs symbol in an a.out object file. In this case, the
752 next values printed are the stabs other field, the stabs desc field, and
753 the stab type. Stabs symbols are used to hold debugging information.
755 For more information, see @ref{Top,Stabs,Stabs Overview,stabs.info, The
756 ``stabs'' debug format}.
760 The symbol type is unknown, or object file format specific.
769 @c man begin OPTIONS nm
770 The long and short forms of options, shown here as alternatives, are
776 @itemx --print-file-name
777 @cindex input file name
779 @cindex source file name
780 Precede each symbol by the name of the input file (or archive member)
781 in which it was found, rather than identifying the input file once only,
782 before all of its symbols.
786 @cindex debugging symbols
787 Display all symbols, even debugger-only symbols; normally these are not
791 @cindex @command{nm} format
792 @cindex @command{nm} compatibility
793 The same as @option{--format=bsd} (for compatibility with the MIPS @command{nm}).
796 @itemx --demangle[=@var{style}]
797 @cindex demangling in nm
798 Decode (@dfn{demangle}) low-level symbol names into user-level names.
799 Besides removing any initial underscore prepended by the system, this
800 makes C++ function names readable. Different compilers have different
801 mangling styles. The optional demangling style argument can be used to
802 choose an appropriate demangling style for your compiler. @xref{c++filt},
803 for more information on demangling.
806 Do not demangle low-level symbol names. This is the default.
810 @cindex dynamic symbols
811 Display the dynamic symbols rather than the normal symbols. This is
812 only meaningful for dynamic objects, such as certain types of shared
815 @item -f @var{format}
816 @itemx --format=@var{format}
817 @cindex @command{nm} format
818 @cindex @command{nm} compatibility
819 Use the output format @var{format}, which can be @code{bsd},
820 @code{sysv}, or @code{posix}. The default is @code{bsd}.
821 Only the first character of @var{format} is significant; it can be
822 either upper or lower case.
826 @cindex external symbols
827 Display only external symbols.
830 @itemx --line-numbers
831 @cindex symbol line numbers
832 For each symbol, use debugging information to try to find a filename and
833 line number. For a defined symbol, look for the line number of the
834 address of the symbol. For an undefined symbol, look for the line
835 number of a relocation entry which refers to the symbol. If line number
836 information can be found, print it after the other symbol information.
840 @itemx --numeric-sort
841 Sort symbols numerically by their addresses, rather than alphabetically
846 @cindex sorting symbols
847 Do not bother to sort the symbols in any order; print them in the order
852 Use the POSIX.2 standard output format instead of the default format.
853 Equivalent to @samp{-f posix}.
857 Print size of defined symbols for the @code{bsd} output format.
861 @cindex symbol index, listing
862 When listing symbols from archive members, include the index: a mapping
863 (stored in the archive by @command{ar} or @command{ranlib}) of which modules
864 contain definitions for which names.
867 @itemx --reverse-sort
868 Reverse the order of the sort (whether numeric or alphabetic); let the
872 Sort symbols by size. The size is computed as the difference between
873 the value of the symbol and the value of the symbol with the next higher
874 value. The size of the symbol is printed, rather than the value.
877 @itemx --radix=@var{radix}
878 Use @var{radix} as the radix for printing the symbol values. It must be
879 @samp{d} for decimal, @samp{o} for octal, or @samp{x} for hexadecimal.
881 @item --target=@var{bfdname}
882 @cindex object code format
883 Specify an object code format other than your system's default format.
884 @xref{Target Selection}, for more information.
887 @itemx --undefined-only
888 @cindex external symbols
889 @cindex undefined symbols
890 Display only undefined symbols (those external to each object file).
893 @cindex external symbols
894 @cindex undefined symbols
895 Display only defined symbols for each object file.
899 Show the version number of @command{nm} and exit.
902 This option is ignored for compatibility with the AIX version of
903 @command{nm}. It takes one parameter which must be the string
904 @option{32_64}. The default mode of AIX @command{nm} corresponds
905 to @option{-X 32}, which is not supported by @sc{gnu} @command{nm}.
908 Show a summary of the options to @command{nm} and exit.
914 @c man begin SEEALSO nm
915 ar(1), objdump(1), ranlib(1), and the Info entries for @file{binutils}.
922 @c man title objcopy copy and translate object files
925 @c man begin SYNOPSIS objcopy
926 objcopy [@option{-F} @var{bfdname}|@option{--target=}@var{bfdname}]
927 [@option{-I} @var{bfdname}|@option{--input-target=}@var{bfdname}]
928 [@option{-O} @var{bfdname}|@option{--output-target=}@var{bfdname}]
929 [@option{-B} @var{bfdarch}|@option{--binary-architecture=}@var{bfdarch}]
930 [@option{-S}|@option{--strip-all}] [@option{-g}|@option{--strip-debug}]
931 [@option{-K} @var{symbolname}|@option{--keep-symbol=}@var{symbolname}]
932 [@option{-N} @var{symbolname}|@option{--strip-symbol=}@var{symbolname}]
933 [@option{-G} @var{symbolname}|@option{--keep-global-symbol=}@var{symbolname}]
934 [@option{-L} @var{symbolname}|@option{--localize-symbol=}@var{symbolname}]
935 [@option{-W} @var{symbolname}|@option{--weaken-symbol=}@var{symbolname}]
936 [@option{-x}|@option{--discard-all}] [@option{-X}|@option{--discard-locals}]
937 [@option{-b} @var{byte}|@option{--byte=}@var{byte}]
938 [@option{-i} @var{interleave}|@option{--interleave=}@var{interleave}]
939 [@option{-j} @var{sectionname}|@option{--only-section=}@var{sectionname}]
940 [@option{-R} @var{sectionname}|@option{--remove-section=}@var{sectionname}]
941 [@option{-p}|@option{--preserve-dates}]
942 [@option{--debugging}]
943 [@option{--gap-fill=}@var{val}] [@option{--pad-to=}@var{address}]
944 [@option{--set-start=}@var{val}] [@option{--adjust-start=}@var{incr}]
945 [@option{--change-addresses=}@var{incr}]
946 [@option{--change-section-address} @var{section}@{=,+,-@}@var{val}]
947 [@option{--change-section-lma} @var{section}@{=,+,-@}@var{val}]
948 [@option{--change-section-vma} @var{section}@{=,+,-@}@var{val}]
949 [@option{--change-warnings}] [@option{--no-change-warnings}]
950 [@option{--set-section-flags} @var{section}=@var{flags}]
951 [@option{--add-section} @var{sectionname}=@var{filename}]
952 [@option{--rename-section} @var{oldname}=@var{newname}[,@var{flags}]]
953 [@option{--change-leading-char} ] [@option{--remove-leading-char}]
954 [@option{--srec-len=}@var{ival} ] [@option{--srec-forceS3}]
955 [@option{--redefine-sym} @var{old}=@var{new} ]
957 [@option{--keep-symbols=}@var{filename}]
958 [@option{--strip-symbols=}@var{filename}]
959 [@option{--keep-global-symbols=}@var{filename}]
960 [@option{--localize-symbols=}@var{filename}]
961 [@option{--weaken-symbols=}@var{filename}]
962 [@option{--alt-machine-code=}@var{index}]
963 [@option{--prefix-symbols=}@var{string}]
964 [@option{--prefix-sections=}@var{string}]
965 [@option{--prefix-alloc-sections=}@var{string}]
966 [@option{-v}|@option{--verbose}]
967 [@option{-V}|@option{--version}]
969 @var{infile} [@var{outfile}]
973 @c man begin DESCRIPTION objcopy
974 The @sc{gnu} @command{objcopy} utility copies the contents of an object
975 file to another. @command{objcopy} uses the @sc{gnu} @sc{bfd} Library to
976 read and write the object files. It can write the destination object
977 file in a format different from that of the source object file. The
978 exact behavior of @command{objcopy} is controlled by command-line options.
979 Note that @command{objcopy} should be able to copy a fully linked file
980 between any two formats. However, copying a relocatable object file
981 between any two formats may not work as expected.
983 @command{objcopy} creates temporary files to do its translations and
984 deletes them afterward. @command{objcopy} uses @sc{bfd} to do all its
985 translation work; it has access to all the formats described in @sc{bfd}
986 and thus is able to recognize most formats without being told
987 explicitly. @xref{BFD,,BFD,ld.info,Using LD}.
989 @command{objcopy} can be used to generate S-records by using an output
990 target of @samp{srec} (e.g., use @samp{-O srec}).
992 @command{objcopy} can be used to generate a raw binary file by using an
993 output target of @samp{binary} (e.g., use @option{-O binary}). When
994 @command{objcopy} generates a raw binary file, it will essentially produce
995 a memory dump of the contents of the input object file. All symbols and
996 relocation information will be discarded. The memory dump will start at
997 the load address of the lowest section copied into the output file.
999 When generating an S-record or a raw binary file, it may be helpful to
1000 use @option{-S} to remove sections containing debugging information. In
1001 some cases @option{-R} will be useful to remove sections which contain
1002 information that is not needed by the binary file.
1004 Note---@command{objcopy} is not able to change the endianness of its input
1005 files. If the input format has an endianness (some formats do not),
1006 @command{objcopy} can only copy the inputs into file formats that have the
1007 same endianness or which have no endianness (e.g., @samp{srec}).
1011 @c man begin OPTIONS objcopy
1015 @itemx @var{outfile}
1016 The input and output files, respectively.
1017 If you do not specify @var{outfile}, @command{objcopy} creates a
1018 temporary file and destructively renames the result with
1019 the name of @var{infile}.
1021 @item -I @var{bfdname}
1022 @itemx --input-target=@var{bfdname}
1023 Consider the source file's object format to be @var{bfdname}, rather than
1024 attempting to deduce it. @xref{Target Selection}, for more information.
1026 @item -O @var{bfdname}
1027 @itemx --output-target=@var{bfdname}
1028 Write the output file using the object format @var{bfdname}.
1029 @xref{Target Selection}, for more information.
1031 @item -F @var{bfdname}
1032 @itemx --target=@var{bfdname}
1033 Use @var{bfdname} as the object format for both the input and the output
1034 file; i.e., simply transfer data from source to destination with no
1035 translation. @xref{Target Selection}, for more information.
1037 @item -B @var{bfdarch}
1038 @itemx --binary-architecture=@var{bfdarch}
1039 Useful when transforming a raw binary input file into an object file.
1040 In this case the output architecture can be set to @var{bfdarch}. This
1041 option will be ignored if the input file has a known @var{bfdarch}. You
1042 can access this binary data inside a program by referencing the special
1043 symbols that are created by the conversion process. These symbols are
1044 called _binary_@var{objfile}_start, _binary_@var{objfile}_end and
1045 _binary_@var{objfile}_size. e.g. you can transform a picture file into
1046 an object file and then access it in your code using these symbols.
1048 @item -j @var{sectionname}
1049 @itemx --only-section=@var{sectionname}
1050 Copy only the named section from the input file to the output file.
1051 This option may be given more than once. Note that using this option
1052 inappropriately may make the output file unusable.
1054 @item -R @var{sectionname}
1055 @itemx --remove-section=@var{sectionname}
1056 Remove any section named @var{sectionname} from the output file. This
1057 option may be given more than once. Note that using this option
1058 inappropriately may make the output file unusable.
1062 Do not copy relocation and symbol information from the source file.
1065 @itemx --strip-debug
1066 Do not copy debugging symbols from the source file.
1068 @item --strip-unneeded
1069 Strip all symbols that are not needed for relocation processing.
1071 @item -K @var{symbolname}
1072 @itemx --keep-symbol=@var{symbolname}
1073 Copy only symbol @var{symbolname} from the source file. This option may
1074 be given more than once.
1076 @item -N @var{symbolname}
1077 @itemx --strip-symbol=@var{symbolname}
1078 Do not copy symbol @var{symbolname} from the source file. This option
1079 may be given more than once.
1081 @item -G @var{symbolname}
1082 @itemx --keep-global-symbol=@var{symbolname}
1083 Keep only symbol @var{symbolname} global. Make all other symbols local
1084 to the file, so that they are not visible externally. This option may
1085 be given more than once.
1087 @item -L @var{symbolname}
1088 @itemx --localize-symbol=@var{symbolname}
1089 Make symbol @var{symbolname} local to the file, so that it is not
1090 visible externally. This option may be given more than once.
1092 @item -W @var{symbolname}
1093 @itemx --weaken-symbol=@var{symbolname}
1094 Make symbol @var{symbolname} weak. This option may be given more than once.
1097 @itemx --discard-all
1098 Do not copy non-global symbols from the source file.
1099 @c FIXME any reason to prefer "non-global" to "local" here?
1102 @itemx --discard-locals
1103 Do not copy compiler-generated local symbols.
1104 (These usually start with @samp{L} or @samp{.}.)
1107 @itemx --byte=@var{byte}
1108 Keep only every @var{byte}th byte of the input file (header data is not
1109 affected). @var{byte} can be in the range from 0 to @var{interleave}-1,
1110 where @var{interleave} is given by the @option{-i} or @option{--interleave}
1111 option, or the default of 4. This option is useful for creating files
1112 to program @sc{rom}. It is typically used with an @code{srec} output
1115 @item -i @var{interleave}
1116 @itemx --interleave=@var{interleave}
1117 Only copy one out of every @var{interleave} bytes. Select which byte to
1118 copy with the @option{-b} or @option{--byte} option. The default is 4.
1119 @command{objcopy} ignores this option if you do not specify either @option{-b} or
1123 @itemx --preserve-dates
1124 Set the access and modification dates of the output file to be the same
1125 as those of the input file.
1128 Convert debugging information, if possible. This is not the default
1129 because only certain debugging formats are supported, and the
1130 conversion process can be time consuming.
1132 @item --gap-fill @var{val}
1133 Fill gaps between sections with @var{val}. This operation applies to
1134 the @emph{load address} (LMA) of the sections. It is done by increasing
1135 the size of the section with the lower address, and filling in the extra
1136 space created with @var{val}.
1138 @item --pad-to @var{address}
1139 Pad the output file up to the load address @var{address}. This is
1140 done by increasing the size of the last section. The extra space is
1141 filled in with the value specified by @option{--gap-fill} (default zero).
1143 @item --set-start @var{val}
1144 Set the start address of the new file to @var{val}. Not all object file
1145 formats support setting the start address.
1147 @item --change-start @var{incr}
1148 @itemx --adjust-start @var{incr}
1149 @cindex changing start address
1150 Change the start address by adding @var{incr}. Not all object file
1151 formats support setting the start address.
1153 @item --change-addresses @var{incr}
1154 @itemx --adjust-vma @var{incr}
1155 @cindex changing object addresses
1156 Change the VMA and LMA addresses of all sections, as well as the start
1157 address, by adding @var{incr}. Some object file formats do not permit
1158 section addresses to be changed arbitrarily. Note that this does not
1159 relocate the sections; if the program expects sections to be loaded at a
1160 certain address, and this option is used to change the sections such
1161 that they are loaded at a different address, the program may fail.
1163 @item --change-section-address @var{section}@{=,+,-@}@var{val}
1164 @itemx --adjust-section-vma @var{section}@{=,+,-@}@var{val}
1165 @cindex changing section address
1166 Set or change both the VMA address and the LMA address of the named
1167 @var{section}. If @samp{=} is used, the section address is set to
1168 @var{val}. Otherwise, @var{val} is added to or subtracted from the
1169 section address. See the comments under @option{--change-addresses},
1170 above. If @var{section} does not exist in the input file, a warning will
1171 be issued, unless @option{--no-change-warnings} is used.
1173 @item --change-section-lma @var{section}@{=,+,-@}@var{val}
1174 @cindex changing section LMA
1175 Set or change the LMA address of the named @var{section}. The LMA
1176 address is the address where the section will be loaded into memory at
1177 program load time. Normally this is the same as the VMA address, which
1178 is the address of the section at program run time, but on some systems,
1179 especially those where a program is held in ROM, the two can be
1180 different. If @samp{=} is used, the section address is set to
1181 @var{val}. Otherwise, @var{val} is added to or subtracted from the
1182 section address. See the comments under @option{--change-addresses},
1183 above. If @var{section} does not exist in the input file, a warning
1184 will be issued, unless @option{--no-change-warnings} is used.
1186 @item --change-section-vma @var{section}@{=,+,-@}@var{val}
1187 @cindex changing section VMA
1188 Set or change the VMA address of the named @var{section}. The VMA
1189 address is the address where the section will be located once the
1190 program has started executing. Normally this is the same as the LMA
1191 address, which is the address where the section will be loaded into
1192 memory, but on some systems, especially those where a program is held in
1193 ROM, the two can be different. If @samp{=} is used, the section address
1194 is set to @var{val}. Otherwise, @var{val} is added to or subtracted
1195 from the section address. See the comments under
1196 @option{--change-addresses}, above. If @var{section} does not exist in
1197 the input file, a warning will be issued, unless
1198 @option{--no-change-warnings} is used.
1200 @item --change-warnings
1201 @itemx --adjust-warnings
1202 If @option{--change-section-address} or @option{--change-section-lma} or
1203 @option{--change-section-vma} is used, and the named section does not
1204 exist, issue a warning. This is the default.
1206 @item --no-change-warnings
1207 @itemx --no-adjust-warnings
1208 Do not issue a warning if @option{--change-section-address} or
1209 @option{--adjust-section-lma} or @option{--adjust-section-vma} is used, even
1210 if the named section does not exist.
1212 @item --set-section-flags @var{section}=@var{flags}
1213 Set the flags for the named section. The @var{flags} argument is a
1214 comma separated string of flag names. The recognized names are
1215 @samp{alloc}, @samp{contents}, @samp{load}, @samp{noload},
1216 @samp{readonly}, @samp{code}, @samp{data}, @samp{rom}, @samp{share}, and
1217 @samp{debug}. You can set the @samp{contents} flag for a section which
1218 does not have contents, but it is not meaningful to clear the
1219 @samp{contents} flag of a section which does have contents--just remove
1220 the section instead. Not all flags are meaningful for all object file
1223 @item --add-section @var{sectionname}=@var{filename}
1224 Add a new section named @var{sectionname} while copying the file. The
1225 contents of the new section are taken from the file @var{filename}. The
1226 size of the section will be the size of the file. This option only
1227 works on file formats which can support sections with arbitrary names.
1229 @item --rename-section @var{oldname}=@var{newname}[,@var{flags}]
1230 Rename a section from @var{oldname} to @var{newname}, optionally
1231 changing the section's flags to @var{flags} in the process. This has
1232 the advantage over usng a linker script to perform the rename in that
1233 the output stays as an object file and does not become a linked
1236 This option is particularly helpful when the input format is binary,
1237 since this will always create a section called .data. If for example,
1238 you wanted instead to create a section called .rodata containing binary
1239 data you could use the following command line to achieve it:
1242 objcopy -I binary -O <output_format> -B <architecture> \
1243 --rename-section .data=.rodata,alloc,load,readonly,data,contents \
1244 <input_binary_file> <output_object_file>
1247 @item --change-leading-char
1248 Some object file formats use special characters at the start of
1249 symbols. The most common such character is underscore, which compilers
1250 often add before every symbol. This option tells @command{objcopy} to
1251 change the leading character of every symbol when it converts between
1252 object file formats. If the object file formats use the same leading
1253 character, this option has no effect. Otherwise, it will add a
1254 character, or remove a character, or change a character, as
1257 @item --remove-leading-char
1258 If the first character of a global symbol is a special symbol leading
1259 character used by the object file format, remove the character. The
1260 most common symbol leading character is underscore. This option will
1261 remove a leading underscore from all global symbols. This can be useful
1262 if you want to link together objects of different file formats with
1263 different conventions for symbol names. This is different from
1264 @option{--change-leading-char} because it always changes the symbol name
1265 when appropriate, regardless of the object file format of the output
1268 @item --srec-len=@var{ival}
1269 Meaningful only for srec output. Set the maximum length of the Srecords
1270 being produced to @var{ival}. This length covers both address, data and
1273 @item --srec-forceS3
1274 Meaningful only for srec output. Avoid generation of S1/S2 records,
1275 creating S3-only record format.
1277 @item --redefine-sym @var{old}=@var{new}
1278 Change the name of a symbol @var{old}, to @var{new}. This can be useful
1279 when one is trying link two things together for which you have no
1280 source, and there are name collisions.
1283 Change all global symbols in the file to be weak. This can be useful
1284 when building an object which will be linked against other objects using
1285 the @option{-R} option to the linker. This option is only effective when
1286 using an object file format which supports weak symbols.
1288 @item --keep-symbols=@var{filename}
1289 Apply @option{--keep-symbol} option to each symbol listed in the file
1290 @var{filename}. @var{filename} is simply a flat file, with one symbol
1291 name per line. Line comments may be introduced by the hash character.
1292 This option may be given more than once.
1294 @item --strip-symbols=@var{filename}
1295 Apply @option{--strip-symbol} option to each symbol listed in the file
1296 @var{filename}. @var{filename} is simply a flat file, with one symbol
1297 name per line. Line comments may be introduced by the hash character.
1298 This option may be given more than once.
1300 @item --keep-global-symbols=@var{filename}
1301 Apply @option{--keep-global-symbol} option to each symbol listed in the
1302 file @var{filename}. @var{filename} is simply a flat file, with one
1303 symbol name per line. Line comments may be introduced by the hash
1304 character. This option may be given more than once.
1306 @item --localize-symbols=@var{filename}
1307 Apply @option{--localize-symbol} option to each symbol listed in the file
1308 @var{filename}. @var{filename} is simply a flat file, with one symbol
1309 name per line. Line comments may be introduced by the hash character.
1310 This option may be given more than once.
1312 @item --weaken-symbols=@var{filename}
1313 Apply @option{--weaken-symbol} option to each symbol listed in the file
1314 @var{filename}. @var{filename} is simply a flat file, with one symbol
1315 name per line. Line comments may be introduced by the hash character.
1316 This option may be given more than once.
1318 @item --alt-machine-code=@var{index}
1319 If the output architecture has alternate machine codes, use the
1320 @var{index}th code instead of the default one. This is useful in case
1321 a machine is assigned an official code and the tool-chain adopts the
1322 new code, but other applications still depend on the original code
1325 @item --prefix-symbols=@var{string}
1326 Prefix all symbols in the output file with @var{string}.
1328 @item --prefix-sections=@var{string}
1329 Prefix all section names in the output file with @var{string}.
1331 @item --prefix-alloc-sections=@var{string}
1332 Prefix all the names of all allocated sections in the output file with
1337 Show the version number of @command{objcopy}.
1341 Verbose output: list all object files modified. In the case of
1342 archives, @samp{objcopy -V} lists all members of the archive.
1345 Show a summary of the options to @command{objcopy}.
1351 @c man begin SEEALSO objcopy
1352 ld(1), objdump(1), and the Info entries for @file{binutils}.
1359 @cindex object file information
1362 @c man title objdump display information from object files.
1365 @c man begin SYNOPSIS objdump
1366 objdump [@option{-a}|@option{--archive-headers}]
1367 [@option{-b} @var{bfdname}|@option{--target=@var{bfdname}}]
1368 [@option{-C}|@option{--demangle}[=@var{style}] ]
1369 [@option{-d}|@option{--disassemble}]
1370 [@option{-D}|@option{--disassemble-all}]
1371 [@option{-z}|@option{--disassemble-zeroes}]
1372 [@option{-EB}|@option{-EL}|@option{--endian=}@{big | little @}]
1373 [@option{-f}|@option{--file-headers}]
1374 [@option{--file-start-context}]
1375 [@option{-g}|@option{--debugging}]
1376 [@option{-h}|@option{--section-headers}|@option{--headers}]
1377 [@option{-i}|@option{--info}]
1378 [@option{-j} @var{section}|@option{--section=}@var{section}]
1379 [@option{-l}|@option{--line-numbers}]
1380 [@option{-S}|@option{--source}]
1381 [@option{-m} @var{machine}|@option{--architecture=}@var{machine}]
1382 [@option{-M} @var{options}|@option{--disassembler-options=}@var{options}]
1383 [@option{-p}|@option{--private-headers}]
1384 [@option{-r}|@option{--reloc}]
1385 [@option{-R}|@option{--dynamic-reloc}]
1386 [@option{-s}|@option{--full-contents}]
1387 [@option{-G}|@option{--stabs}]
1388 [@option{-t}|@option{--syms}]
1389 [@option{-T}|@option{--dynamic-syms}]
1390 [@option{-x}|@option{--all-headers}]
1391 [@option{-w}|@option{--wide}]
1392 [@option{--start-address=}@var{address}]
1393 [@option{--stop-address=}@var{address}]
1394 [@option{--prefix-addresses}]
1395 [@option{--[no-]show-raw-insn}]
1396 [@option{--adjust-vma=}@var{offset}]
1397 [@option{-V}|@option{--version}]
1398 [@option{-H}|@option{--help}]
1399 @var{objfile}@dots{}
1403 @c man begin DESCRIPTION objdump
1405 @command{objdump} displays information about one or more object files.
1406 The options control what particular information to display. This
1407 information is mostly useful to programmers who are working on the
1408 compilation tools, as opposed to programmers who just want their
1409 program to compile and work.
1411 @var{objfile}@dots{} are the object files to be examined. When you
1412 specify archives, @command{objdump} shows information on each of the member
1417 @c man begin OPTIONS objdump
1419 The long and short forms of options, shown here as alternatives, are
1420 equivalent. At least one option from the list
1421 @option{-a,-d,-D,-f,-g,-G,-h,-H,-p,-r,-R,-S,-t,-T,-V,-x} must be given.
1425 @itemx --archive-header
1426 @cindex archive headers
1427 If any of the @var{objfile} files are archives, display the archive
1428 header information (in a format similar to @samp{ls -l}). Besides the
1429 information you could list with @samp{ar tv}, @samp{objdump -a} shows
1430 the object file format of each archive member.
1432 @item --adjust-vma=@var{offset}
1433 @cindex section addresses in objdump
1434 @cindex VMA in objdump
1435 When dumping information, first add @var{offset} to all the section
1436 addresses. This is useful if the section addresses do not correspond to
1437 the symbol table, which can happen when putting sections at particular
1438 addresses when using a format which can not represent section addresses,
1441 @item -b @var{bfdname}
1442 @itemx --target=@var{bfdname}
1443 @cindex object code format
1444 Specify that the object-code format for the object files is
1445 @var{bfdname}. This option may not be necessary; @var{objdump} can
1446 automatically recognize many formats.
1450 objdump -b oasys -m vax -h fu.o
1453 displays summary information from the section headers (@option{-h}) of
1454 @file{fu.o}, which is explicitly identified (@option{-m}) as a VAX object
1455 file in the format produced by Oasys compilers. You can list the
1456 formats available with the @option{-i} option.
1457 @xref{Target Selection}, for more information.
1460 @itemx --demangle[=@var{style}]
1461 @cindex demangling in objdump
1462 Decode (@dfn{demangle}) low-level symbol names into user-level names.
1463 Besides removing any initial underscore prepended by the system, this
1464 makes C++ function names readable. Different compilers have different
1465 mangling styles. The optional demangling style argument can be used to
1466 choose an appropriate demangling style for your compiler. @xref{c++filt},
1467 for more information on demangling.
1471 Display debugging information. This attempts to parse debugging
1472 information stored in the file and print it out using a C like syntax.
1473 Only certain types of debugging information have been implemented.
1476 @itemx --disassemble
1477 @cindex disassembling object code
1478 @cindex machine instructions
1479 Display the assembler mnemonics for the machine instructions from
1480 @var{objfile}. This option only disassembles those sections which are
1481 expected to contain instructions.
1484 @itemx --disassemble-all
1485 Like @option{-d}, but disassemble the contents of all sections, not just
1486 those expected to contain instructions.
1488 @item --prefix-addresses
1489 When disassembling, print the complete address on each line. This is
1490 the older disassembly format.
1494 @itemx --endian=@{big|little@}
1496 @cindex disassembly endianness
1497 Specify the endianness of the object files. This only affects
1498 disassembly. This can be useful when disassembling a file format which
1499 does not describe endianness information, such as S-records.
1502 @itemx --file-headers
1503 @cindex object file header
1504 Display summary information from the overall header of
1505 each of the @var{objfile} files.
1507 @item --file-start-context
1508 @cindex source code context
1509 Specify that when displaying interlisted source code/disassembly
1510 (assumes @option{-S}) from a file that has not yet been displayed, extend the
1511 context to the start of the file.
1514 @itemx --section-headers
1516 @cindex section headers
1517 Display summary information from the section headers of the
1520 File segments may be relocated to nonstandard addresses, for example by
1521 using the @option{-Ttext}, @option{-Tdata}, or @option{-Tbss} options to
1522 @command{ld}. However, some object file formats, such as a.out, do not
1523 store the starting address of the file segments. In those situations,
1524 although @command{ld} relocates the sections correctly, using @samp{objdump
1525 -h} to list the file section headers cannot show the correct addresses.
1526 Instead, it shows the usual addresses, which are implicit for the
1531 Print a summary of the options to @command{objdump} and exit.
1535 @cindex architectures available
1536 @cindex object formats available
1537 Display a list showing all architectures and object formats available
1538 for specification with @option{-b} or @option{-m}.
1541 @itemx --section=@var{name}
1542 @cindex section information
1543 Display information only for section @var{name}.
1546 @itemx --line-numbers
1547 @cindex source filenames for object files
1548 Label the display (using debugging information) with the filename and
1549 source line numbers corresponding to the object code or relocs shown.
1550 Only useful with @option{-d}, @option{-D}, or @option{-r}.
1552 @item -m @var{machine}
1553 @itemx --architecture=@var{machine}
1554 @cindex architecture
1555 @cindex disassembly architecture
1556 Specify the architecture to use when disassembling object files. This
1557 can be useful when disassembling object files which do not describe
1558 architecture information, such as S-records. You can list the available
1559 architectures with the @option{-i} option.
1561 @item -M @var{options}
1562 @itemx --disassembler-options=@var{options}
1563 Pass target specific information to the disassembler. Only supported on
1566 If the target is an ARM architecture then this switch can be used to
1567 select which register name set is used during disassembler. Specifying
1568 @option{-M reg-name-std} (the default) will select the register names as
1569 used in ARM's instruction set documentation, but with register 13 called
1570 'sp', register 14 called 'lr' and register 15 called 'pc'. Specifying
1571 @option{-M reg-names-apcs} will select the name set used by the ARM
1572 Procedure Call Standard, whilst specifying @option{-M reg-names-raw} will
1573 just use @samp{r} followed by the register number.
1575 There are also two variants on the APCS register naming scheme enabled
1576 by @option{-M reg-names-atpcs} and @option{-M reg-names-special-atpcs} which
1577 use the ARM/Thumb Procedure Call Standard naming conventions. (Either
1578 with the normal register names or the special register names).
1580 This option can also be used for ARM architectures to force the
1581 disassembler to interpret all instructions as Thumb instructions by
1582 using the switch @option{--disassembler-options=force-thumb}. This can be
1583 useful when attempting to disassemble thumb code produced by other
1586 For the x86, some of the options duplicate functions of the @option{-m}
1587 switch, but allow finer grained control. Multiple selections from the
1588 following may be specified as a comma separated string.
1589 @option{x86-64}, @option{i386} and @option{i8086} select disassembly for
1590 the given architecture. @option{intel} and @option{att} select between
1591 intel syntax mode and AT&T syntax mode. @option{addr32},
1592 @option{addr16}, @option{data32} and @option{data16} specify the default
1593 address size and operand size. These four options will be overridden if
1594 @option{x86-64}, @option{i386} or @option{i8086} appear later in the
1595 option string. Lastly, @option{suffix}, when in AT&T mode,
1596 instructs the disassembler to print a mnemonic suffix even when the
1597 suffix could be inferred by the operands.
1599 For PPC, @option{booke}, @option{booke32} and @option{booke64} select
1600 disassembly of BookE instructions. @option{32} and @option{64} select
1601 PowerPC and PowerPC64 disassembly, respectively.
1603 For MIPS, this option controls the printing of register names in
1604 disassembled instructions. Multiple selections from the
1605 following may be specified as a comma separated string, and invalid
1606 options are ignored:
1609 @item gpr-names=@var{ABI}
1610 Print GPR (general-purpose register) names as appropriate
1611 for the specified ABI. By default, GPR names are selected according to
1612 the ABI of the binary being disassembled.
1614 @item fpr-names=@var{ABI}
1615 Print FPR (floating-point register) names as
1616 appropriate for the specified ABI. By default, FPR numbers are printed
1619 @item cp0-names=@var{ARCH}
1620 Print CP0 (system control coprocessor; coprocessor 0) register names
1621 as appropriate for the CPU or architecture specified by
1622 @var{ARCH}. By default, CP0 register names are selected according to
1623 the architecture and CPU of the binary being disassembled.
1625 @item hwr-names=@var{ARCH}
1626 Print HWR (hardware register, used by the @code{rdhwr} instruction) names
1627 as appropriate for the CPU or architecture specified by
1628 @var{ARCH}. By default, HWR names are selected according to
1629 the architecture and CPU of the binary being disassembled.
1631 @item reg-names=@var{ABI}
1632 Print GPR and FPR names as appropriate for the selected ABI.
1634 @item reg-names=@var{ARCH}
1635 Print CPU-specific register names (CP0 register and HWR names)
1636 as appropriate for the selected CPU or architecture.
1639 For any of the options listed above, @var{ABI} or
1640 @var{ARCH} may be specified as @samp{numeric} to have numbers printed
1641 rather than names, for the selected types of registers.
1642 You can list the available values of @var{ABI} and @var{ARCH} using
1643 the @option{--help} option.
1646 @itemx --private-headers
1647 Print information that is specific to the object file format. The exact
1648 information printed depends upon the object file format. For some
1649 object file formats, no additional information is printed.
1653 @cindex relocation entries, in object file
1654 Print the relocation entries of the file. If used with @option{-d} or
1655 @option{-D}, the relocations are printed interspersed with the
1659 @itemx --dynamic-reloc
1660 @cindex dynamic relocation entries, in object file
1661 Print the dynamic relocation entries of the file. This is only
1662 meaningful for dynamic objects, such as certain types of shared
1666 @itemx --full-contents
1667 @cindex sections, full contents
1668 @cindex object file sections
1669 Display the full contents of any sections requested.
1673 @cindex source disassembly
1674 @cindex disassembly, with source
1675 Display source code intermixed with disassembly, if possible. Implies
1678 @item --show-raw-insn
1679 When disassembling instructions, print the instruction in hex as well as
1680 in symbolic form. This is the default except when
1681 @option{--prefix-addresses} is used.
1683 @item --no-show-raw-insn
1684 When disassembling instructions, do not print the instruction bytes.
1685 This is the default when @option{--prefix-addresses} is used.
1691 @cindex debug symbols
1692 @cindex ELF object file format
1693 Display the full contents of any sections requested. Display the
1694 contents of the .stab and .stab.index and .stab.excl sections from an
1695 ELF file. This is only useful on systems (such as Solaris 2.0) in which
1696 @code{.stab} debugging symbol-table entries are carried in an ELF
1697 section. In most other file formats, debugging symbol-table entries are
1698 interleaved with linkage symbols, and are visible in the @option{--syms}
1701 For more information on stabs symbols, see @ref{Top,Stabs,Stabs
1702 Overview,stabs.info, The ``stabs'' debug format}.
1705 @item --start-address=@var{address}
1706 @cindex start-address
1707 Start displaying data at the specified address. This affects the output
1708 of the @option{-d}, @option{-r} and @option{-s} options.
1710 @item --stop-address=@var{address}
1711 @cindex stop-address
1712 Stop displaying data at the specified address. This affects the output
1713 of the @option{-d}, @option{-r} and @option{-s} options.
1717 @cindex symbol table entries, printing
1718 Print the symbol table entries of the file.
1719 This is similar to the information provided by the @samp{nm} program.
1722 @itemx --dynamic-syms
1723 @cindex dynamic symbol table entries, printing
1724 Print the dynamic symbol table entries of the file. This is only
1725 meaningful for dynamic objects, such as certain types of shared
1726 libraries. This is similar to the information provided by the @samp{nm}
1727 program when given the @option{-D} (@option{--dynamic}) option.
1731 Print the version number of @command{objdump} and exit.
1734 @itemx --all-headers
1735 @cindex all header information, object file
1736 @cindex header information, all
1737 Display all available header information, including the symbol table and
1738 relocation entries. Using @option{-x} is equivalent to specifying all of
1739 @option{-a -f -h -r -t}.
1743 @cindex wide output, printing
1744 Format some lines for output devices that have more than 80 columns.
1745 Also do not truncate symbol names when they are displayed.
1748 @itemx --disassemble-zeroes
1749 Normally the disassembly output will skip blocks of zeroes. This
1750 option directs the disassembler to disassemble those blocks, just like
1757 @c man begin SEEALSO objdump
1758 nm(1), readelf(1), and the Info entries for @file{binutils}.
1766 @cindex archive contents
1767 @cindex symbol index
1769 @c man title ranlib generate index to archive.
1772 @c man begin SYNOPSIS ranlib
1773 ranlib [@option{-vV}] @var{archive}
1777 @c man begin DESCRIPTION ranlib
1779 @command{ranlib} generates an index to the contents of an archive and
1780 stores it in the archive. The index lists each symbol defined by a
1781 member of an archive that is a relocatable object file.
1783 You may use @samp{nm -s} or @samp{nm --print-armap} to list this index.
1785 An archive with such an index speeds up linking to the library and
1786 allows routines in the library to call each other without regard to
1787 their placement in the archive.
1789 The @sc{gnu} @command{ranlib} program is another form of @sc{gnu} @command{ar}; running
1790 @command{ranlib} is completely equivalent to executing @samp{ar -s}.
1795 @c man begin OPTIONS ranlib
1801 Show the version number of @command{ranlib}.
1807 @c man begin SEEALSO ranlib
1808 ar(1), nm(1), and the Info entries for @file{binutils}.
1816 @cindex section sizes
1818 @c man title size list section sizes and total size.
1821 @c man begin SYNOPSIS size
1822 size [@option{-A}|@option{-B}|@option{--format=}@var{compatibility}]
1824 [@option{-d}|@option{-o}|@option{-x}|@option{--radix=}@var{number}]
1825 [@option{-t}|@option{--totals}]
1826 [@option{--target=}@var{bfdname}] [@option{-V}|@option{--version}]
1827 [@var{objfile}@dots{}]
1831 @c man begin DESCRIPTION size
1833 The @sc{gnu} @command{size} utility lists the section sizes---and the total
1834 size---for each of the object or archive files @var{objfile} in its
1835 argument list. By default, one line of output is generated for each
1836 object file or each module in an archive.
1838 @var{objfile}@dots{} are the object files to be examined.
1839 If none are specified, the file @code{a.out} will be used.
1843 @c man begin OPTIONS size
1845 The command line options have the following meanings:
1850 @itemx --format=@var{compatibility}
1851 @cindex @command{size} display format
1852 Using one of these options, you can choose whether the output from @sc{gnu}
1853 @command{size} resembles output from System V @command{size} (using @option{-A},
1854 or @option{--format=sysv}), or Berkeley @command{size} (using @option{-B}, or
1855 @option{--format=berkeley}). The default is the one-line format similar to
1857 @c Bonus for doc-source readers: you can also say --format=strange (or
1858 @c anything else that starts with 's') for sysv, and --format=boring (or
1859 @c anything else that starts with 'b') for Berkeley.
1861 Here is an example of the Berkeley (default) format of output from
1864 $ size --format=Berkeley ranlib size
1865 text data bss dec hex filename
1866 294880 81920 11592 388392 5ed28 ranlib
1867 294880 81920 11888 388688 5ee50 size
1871 This is the same data, but displayed closer to System V conventions:
1874 $ size --format=SysV ranlib size
1892 Show a summary of acceptable arguments and options.
1897 @itemx --radix=@var{number}
1898 @cindex @command{size} number format
1899 @cindex radix for section sizes
1900 Using one of these options, you can control whether the size of each
1901 section is given in decimal (@option{-d}, or @option{--radix=10}); octal
1902 (@option{-o}, or @option{--radix=8}); or hexadecimal (@option{-x}, or
1903 @option{--radix=16}). In @option{--radix=@var{number}}, only the three
1904 values (8, 10, 16) are supported. The total size is always given in two
1905 radices; decimal and hexadecimal for @option{-d} or @option{-x} output, or
1906 octal and hexadecimal if you're using @option{-o}.
1910 Show totals of all objects listed (Berkeley format listing mode only).
1912 @item --target=@var{bfdname}
1913 @cindex object code format
1914 Specify that the object-code format for @var{objfile} is
1915 @var{bfdname}. This option may not be necessary; @command{size} can
1916 automatically recognize many formats.
1917 @xref{Target Selection}, for more information.
1921 Display the version number of @command{size}.
1927 @c man begin SEEALSO size
1928 ar(1), objdump(1), readelf(1), and the Info entries for @file{binutils}.
1935 @cindex listings strings
1936 @cindex printing strings
1937 @cindex strings, printing
1939 @c man title strings print the strings of printable characters in files.
1942 @c man begin SYNOPSIS strings
1943 strings [@option{-afov}] [@option{-}@var{min-len}]
1944 [@option{-n} @var{min-len}] [@option{--bytes=}@var{min-len}]
1945 [@option{-t} @var{radix}] [@option{--radix=}@var{radix}]
1946 [@option{-e} @var{encoding}] [@option{--encoding=}@var{encoding}]
1947 [@option{-}] [@option{--all}] [@option{--print-file-name}]
1948 [@option{--target=}@var{bfdname}]
1949 [@option{--help}] [@option{--version}] @var{file}@dots{}
1953 @c man begin DESCRIPTION strings
1955 For each @var{file} given, @sc{gnu} @command{strings} prints the printable
1956 character sequences that are at least 4 characters long (or the number
1957 given with the options below) and are followed by an unprintable
1958 character. By default, it only prints the strings from the initialized
1959 and loaded sections of object files; for other types of files, it prints
1960 the strings from the whole file.
1962 @command{strings} is mainly useful for determining the contents of non-text
1967 @c man begin OPTIONS strings
1973 Do not scan only the initialized and loaded sections of object files;
1974 scan the whole files.
1977 @itemx --print-file-name
1978 Print the name of the file before each string.
1981 Print a summary of the program usage on the standard output and exit.
1983 @item -@var{min-len}
1984 @itemx -n @var{min-len}
1985 @itemx --bytes=@var{min-len}
1986 Print sequences of characters that are at least @var{min-len} characters
1987 long, instead of the default 4.
1990 Like @samp{-t o}. Some other versions of @command{strings} have @option{-o}
1991 act like @samp{-t d} instead. Since we can not be compatible with both
1992 ways, we simply chose one.
1994 @item -t @var{radix}
1995 @itemx --radix=@var{radix}
1996 Print the offset within the file before each string. The single
1997 character argument specifies the radix of the offset---@samp{o} for
1998 octal, @samp{x} for hexadecimal, or @samp{d} for decimal.
2000 @item -e @var{encoding}
2001 @itemx --encoding=@var{encoding}
2002 Select the character encoding of the strings that are to be found.
2003 Possible values for @var{encoding} are: @samp{s} = single-7-bit-byte
2004 characters (ASCII, ISO 8859, etc., default), @samp{S} =
2005 single-8-bit-byte characters, @samp{b} = 16-bit bigendian, @samp{l} =
2006 16-bit littleendian, @samp{B} = 32-bit bigendian, @samp{L} = 32-bit
2007 littleendian. Useful for finding wide character strings.
2009 @item --target=@var{bfdname}
2010 @cindex object code format
2011 Specify an object code format other than your system's default format.
2012 @xref{Target Selection}, for more information.
2016 Print the program version number on the standard output and exit.
2022 @c man begin SEEALSO strings
2023 ar(1), nm(1), objdump(1), ranlib(1), readelf(1)
2024 and the Info entries for @file{binutils}.
2032 @cindex removing symbols
2033 @cindex discarding symbols
2034 @cindex symbols, discarding
2036 @c man title strip Discard symbols from object files.
2039 @c man begin SYNOPSIS strip
2040 strip [@option{-F} @var{bfdname} |@option{--target=}@var{bfdname} ]
2041 [@option{-I} @var{bfdname} |@option{--input-target=}@var{bfdname} ]
2042 [@option{-O} @var{bfdname} |@option{--output-target=}@var{bfdname} ]
2043 [@option{-s}|@option{--strip-all}] [@option{-S}|@option{-g}|@option{-d}|@option{--strip-debug}]
2044 [@option{-K} @var{symbolname} |@option{--keep-symbol=}@var{symbolname} ]
2045 [@option{-N} @var{symbolname} |@option{--strip-symbol=}@var{symbolname} ]
2046 [@option{-x}|@option{--discard-all} ] [@option{-X} |@option{--discard-locals}]
2047 [@option{-R} @var{sectionname} |@option{--remove-section=}@var{sectionname} ]
2048 [@option{-o} @var{file} ] [@option{-p}|@option{--preserve-dates}]
2049 [@option{-v} |@option{--verbose}] [@option{-V}|@option{--version}] [@option{--help}]
2050 @var{objfile}@dots{}
2054 @c man begin DESCRIPTION strip
2056 @sc{gnu} @command{strip} discards all symbols from object files
2057 @var{objfile}. The list of object files may include archives.
2058 At least one object file must be given.
2060 @command{strip} modifies the files named in its argument,
2061 rather than writing modified copies under different names.
2065 @c man begin OPTIONS strip
2068 @item -F @var{bfdname}
2069 @itemx --target=@var{bfdname}
2070 Treat the original @var{objfile} as a file with the object
2071 code format @var{bfdname}, and rewrite it in the same format.
2072 @xref{Target Selection}, for more information.
2075 Show a summary of the options to @command{strip} and exit.
2077 @item -I @var{bfdname}
2078 @itemx --input-target=@var{bfdname}
2079 Treat the original @var{objfile} as a file with the object
2080 code format @var{bfdname}.
2081 @xref{Target Selection}, for more information.
2083 @item -O @var{bfdname}
2084 @itemx --output-target=@var{bfdname}
2085 Replace @var{objfile} with a file in the output format @var{bfdname}.
2086 @xref{Target Selection}, for more information.
2088 @item -R @var{sectionname}
2089 @itemx --remove-section=@var{sectionname}
2090 Remove any section named @var{sectionname} from the output file. This
2091 option may be given more than once. Note that using this option
2092 inappropriately may make the output file unusable.
2101 @itemx --strip-debug
2102 Remove debugging symbols only.
2104 @item --strip-unneeded
2105 Remove all symbols that are not needed for relocation processing.
2107 @item -K @var{symbolname}
2108 @itemx --keep-symbol=@var{symbolname}
2109 Keep only symbol @var{symbolname} from the source file. This option may
2110 be given more than once.
2112 @item -N @var{symbolname}
2113 @itemx --strip-symbol=@var{symbolname}
2114 Remove symbol @var{symbolname} from the source file. This option may be
2115 given more than once, and may be combined with strip options other than
2119 Put the stripped output in @var{file}, rather than replacing the
2120 existing file. When this argument is used, only one @var{objfile}
2121 argument may be specified.
2124 @itemx --preserve-dates
2125 Preserve the access and modification dates of the file.
2128 @itemx --discard-all
2129 Remove non-global symbols.
2132 @itemx --discard-locals
2133 Remove compiler-generated local symbols.
2134 (These usually start with @samp{L} or @samp{.}.)
2138 Show the version number for @command{strip}.
2142 Verbose output: list all object files modified. In the case of
2143 archives, @samp{strip -v} lists all members of the archive.
2149 @c man begin SEEALSO strip
2150 the Info entries for @file{binutils}.
2154 @node c++filt, addr2line, strip, Top
2158 @cindex demangling C++ symbols
2160 @c man title cxxfilt Demangle C++ and Java symbols.
2163 @c man begin SYNOPSIS cxxfilt
2164 c++filt [@option{-_}|@option{--strip-underscores}]
2165 [@option{-j}|@option{--java}]
2166 [@option{-n}|@option{--no-strip-underscores}]
2167 [@option{-s} @var{format}|@option{--format=}@var{format}]
2168 [@option{--help}] [@option{--version}] [@var{symbol}@dots{}]
2172 @c man begin DESCRIPTION cxxfilt
2175 The C++ and Java languages provides function overloading, which means
2176 that you can write many functions with the same name (providing each
2177 takes parameters of different types). All C++ and Java function names
2178 are encoded into a low-level assembly label (this process is known as
2179 @dfn{mangling}). The @command{c++filt}
2180 @footnote{MS-DOS does not allow @kbd{+} characters in file names, so on
2181 MS-DOS this program is named @command{cxxfilt}.}
2182 program does the inverse mapping: it decodes (@dfn{demangles}) low-level
2183 names into user-level names so that the linker can keep these overloaded
2184 functions from clashing.
2186 Every alphanumeric word (consisting of letters, digits, underscores,
2187 dollars, or periods) seen in the input is a potential label. If the
2188 label decodes into a C++ name, the C++ name replaces the low-level
2191 You can use @command{c++filt} to decipher individual symbols:
2194 c++filt @var{symbol}
2197 If no @var{symbol} arguments are given, @command{c++filt} reads symbol
2198 names from the standard input and writes the demangled names to the
2199 standard output. All results are printed on the standard output.
2203 @c man begin OPTIONS cxxfilt
2207 @itemx --strip-underscores
2208 On some systems, both the C and C++ compilers put an underscore in front
2209 of every name. For example, the C name @code{foo} gets the low-level
2210 name @code{_foo}. This option removes the initial underscore. Whether
2211 @command{c++filt} removes the underscore by default is target dependent.
2215 Prints demangled names using Java syntax. The default is to use C++
2219 @itemx --no-strip-underscores
2220 Do not remove the initial underscore.
2222 @item -s @var{format}
2223 @itemx --format=@var{format}
2224 @command{c++filt} can decode various methods of mangling, used by
2225 different compilers. The argument to this option selects which
2230 Automatic selection based on executable (the default method)
2232 the one used by the @sc{gnu} C++ compiler (g++)
2234 the one used by the Lucid compiler (lcc)
2236 the one specified by the C++ Annotated Reference Manual
2238 the one used by the HP compiler (aCC)
2240 the one used by the EDG compiler
2242 the one used by the @sc{gnu} C++ compiler (g++) with the V3 ABI.
2244 the one used by the @sc{gnu} Java compiler (gcj)
2246 the one used by the @sc{gnu} Ada compiler (GNAT).
2250 Print a summary of the options to @command{c++filt} and exit.
2253 Print the version number of @command{c++filt} and exit.
2259 @c man begin SEEALSO cxxfilt
2260 the Info entries for @file{binutils}.
2265 @emph{Warning:} @command{c++filt} is a new utility, and the details of its
2266 user interface are subject to change in future releases. In particular,
2267 a command-line option may be required in the the future to decode a name
2268 passed as an argument on the command line; in other words,
2271 c++filt @var{symbol}
2275 may in a future release become
2278 c++filt @var{option} @var{symbol}
2286 @cindex address to file name and line number
2288 @c man title addr2line convert addresses into file names and line numbers.
2291 @c man begin SYNOPSIS addr2line
2292 addr2line [@option{-b} @var{bfdname}|@option{--target=}@var{bfdname}]
2293 [@option{-C}|@option{--demangle}[=@var{style}]]
2294 [@option{-e} @var{filename}|@option{--exe=}@var{filename}]
2295 [@option{-f}|@option{--functions}] [@option{-s}|@option{--basename}]
2296 [@option{-H}|@option{--help}] [@option{-V}|@option{--version}]
2301 @c man begin DESCRIPTION addr2line
2303 @command{addr2line} translates program addresses into file names and line
2304 numbers. Given an address and an executable, it uses the debugging
2305 information in the executable to figure out which file name and line
2306 number are associated with a given address.
2308 The executable to use is specified with the @option{-e} option. The
2309 default is the file @file{a.out}.
2311 @command{addr2line} has two modes of operation.
2313 In the first, hexadecimal addresses are specified on the command line,
2314 and @command{addr2line} displays the file name and line number for each
2317 In the second, @command{addr2line} reads hexadecimal addresses from
2318 standard input, and prints the file name and line number for each
2319 address on standard output. In this mode, @command{addr2line} may be used
2320 in a pipe to convert dynamically chosen addresses.
2322 The format of the output is @samp{FILENAME:LINENO}. The file name and
2323 line number for each address is printed on a separate line. If the
2324 @command{-f} option is used, then each @samp{FILENAME:LINENO} line is
2325 preceded by a @samp{FUNCTIONNAME} line which is the name of the function
2326 containing the address.
2328 If the file name or function name can not be determined,
2329 @command{addr2line} will print two question marks in their place. If the
2330 line number can not be determined, @command{addr2line} will print 0.
2334 @c man begin OPTIONS addr2line
2336 The long and short forms of options, shown here as alternatives, are
2340 @item -b @var{bfdname}
2341 @itemx --target=@var{bfdname}
2342 @cindex object code format
2343 Specify that the object-code format for the object files is
2347 @itemx --demangle[=@var{style}]
2348 @cindex demangling in objdump
2349 Decode (@dfn{demangle}) low-level symbol names into user-level names.
2350 Besides removing any initial underscore prepended by the system, this
2351 makes C++ function names readable. Different compilers have different
2352 mangling styles. The optional demangling style argument can be used to
2353 choose an appropriate demangling style for your compiler. @xref{c++filt},
2354 for more information on demangling.
2356 @item -e @var{filename}
2357 @itemx --exe=@var{filename}
2358 Specify the name of the executable for which addresses should be
2359 translated. The default file is @file{a.out}.
2363 Display function names as well as file and line number information.
2367 Display only the base of each file name.
2373 @c man begin SEEALSO addr2line
2374 Info entries for @file{binutils}.
2381 @command{nlmconv} converts a relocatable object file into a NetWare
2385 @command{nlmconv} currently works with @samp{i386} object
2386 files in @code{coff}, @sc{elf}, or @code{a.out} format, and @sc{SPARC}
2387 object files in @sc{elf}, or @code{a.out} format@footnote{
2388 @command{nlmconv} should work with any @samp{i386} or @sc{sparc} object
2389 format in the Binary File Descriptor library. It has only been tested
2390 with the above formats.}.
2394 @emph{Warning:} @command{nlmconv} is not always built as part of the binary
2395 utilities, since it is only useful for NLM targets.
2398 @c man title nlmconv converts object code into an NLM.
2401 @c man begin SYNOPSIS nlmconv
2402 nlmconv [@option{-I} @var{bfdname}|@option{--input-target=}@var{bfdname}]
2403 [@option{-O} @var{bfdname}|@option{--output-target=}@var{bfdname}]
2404 [@option{-T} @var{headerfile}|@option{--header-file=}@var{headerfile}]
2405 [@option{-d}|@option{--debug}] [@option{-l} @var{linker}|@option{--linker=}@var{linker}]
2406 [@option{-h}|@option{--help}] [@option{-V}|@option{--version}]
2407 @var{infile} @var{outfile}
2411 @c man begin DESCRIPTION nlmconv
2413 @command{nlmconv} converts the relocatable @samp{i386} object file
2414 @var{infile} into the NetWare Loadable Module @var{outfile}, optionally
2415 reading @var{headerfile} for NLM header information. For instructions
2416 on writing the NLM command file language used in header files, see the
2417 @samp{linkers} section, @samp{NLMLINK} in particular, of the @cite{NLM
2418 Development and Tools Overview}, which is part of the NLM Software
2419 Developer's Kit (``NLM SDK''), available from Novell, Inc.
2420 @command{nlmconv} uses the @sc{gnu} Binary File Descriptor library to read
2423 see @ref{BFD,,BFD,ld.info,Using LD}, for more information.
2426 @command{nlmconv} can perform a link step. In other words, you can list
2427 more than one object file for input if you list them in the definitions
2428 file (rather than simply specifying one input file on the command line).
2429 In this case, @command{nlmconv} calls the linker for you.
2433 @c man begin OPTIONS nlmconv
2436 @item -I @var{bfdname}
2437 @itemx --input-target=@var{bfdname}
2438 Object format of the input file. @command{nlmconv} can usually determine
2439 the format of a given file (so no default is necessary).
2440 @xref{Target Selection}, for more information.
2442 @item -O @var{bfdname}
2443 @itemx --output-target=@var{bfdname}
2444 Object format of the output file. @command{nlmconv} infers the output
2445 format based on the input format, e.g. for a @samp{i386} input file the
2446 output format is @samp{nlm32-i386}.
2447 @xref{Target Selection}, for more information.
2449 @item -T @var{headerfile}
2450 @itemx --header-file=@var{headerfile}
2451 Reads @var{headerfile} for NLM header information. For instructions on
2452 writing the NLM command file language used in header files, see@ see the
2453 @samp{linkers} section, of the @cite{NLM Development and Tools
2454 Overview}, which is part of the NLM Software Developer's Kit, available
2459 Displays (on standard error) the linker command line used by @command{nlmconv}.
2461 @item -l @var{linker}
2462 @itemx --linker=@var{linker}
2463 Use @var{linker} for any linking. @var{linker} can be an absolute or a
2468 Prints a usage summary.
2472 Prints the version number for @command{nlmconv}.
2478 @c man begin SEEALSO nlmconv
2479 the Info entries for @file{binutils}.
2486 @command{windres} may be used to manipulate Windows resources.
2489 @emph{Warning:} @command{windres} is not always built as part of the binary
2490 utilities, since it is only useful for Windows targets.
2493 @c man title windres manipulate Windows resources.
2496 @c man begin SYNOPSIS windres
2497 windres [options] [input-file] [output-file]
2501 @c man begin DESCRIPTION windres
2503 @command{windres} reads resources from an input file and copies them into
2504 an output file. Either file may be in one of three formats:
2508 A text format read by the Resource Compiler.
2511 A binary format generated by the Resource Compiler.
2514 A COFF object or executable.
2517 The exact description of these different formats is available in
2518 documentation from Microsoft.
2520 When @command{windres} converts from the @code{rc} format to the @code{res}
2521 format, it is acting like the Windows Resource Compiler. When
2522 @command{windres} converts from the @code{res} format to the @code{coff}
2523 format, it is acting like the Windows @code{CVTRES} program.
2525 When @command{windres} generates an @code{rc} file, the output is similar
2526 but not identical to the format expected for the input. When an input
2527 @code{rc} file refers to an external filename, an output @code{rc} file
2528 will instead include the file contents.
2530 If the input or output format is not specified, @command{windres} will
2531 guess based on the file name, or, for the input file, the file contents.
2532 A file with an extension of @file{.rc} will be treated as an @code{rc}
2533 file, a file with an extension of @file{.res} will be treated as a
2534 @code{res} file, and a file with an extension of @file{.o} or
2535 @file{.exe} will be treated as a @code{coff} file.
2537 If no output file is specified, @command{windres} will print the resources
2538 in @code{rc} format to standard output.
2540 The normal use is for you to write an @code{rc} file, use @command{windres}
2541 to convert it to a COFF object file, and then link the COFF file into
2542 your application. This will make the resources described in the
2543 @code{rc} file available to Windows.
2547 @c man begin OPTIONS windres
2550 @item -i @var{filename}
2551 @itemx --input @var{filename}
2552 The name of the input file. If this option is not used, then
2553 @command{windres} will use the first non-option argument as the input file
2554 name. If there are no non-option arguments, then @command{windres} will
2555 read from standard input. @command{windres} can not read a COFF file from
2558 @item -o @var{filename}
2559 @itemx --output @var{filename}
2560 The name of the output file. If this option is not used, then
2561 @command{windres} will use the first non-option argument, after any used
2562 for the input file name, as the output file name. If there is no
2563 non-option argument, then @command{windres} will write to standard output.
2564 @command{windres} can not write a COFF file to standard output.
2566 @item -I @var{format}
2567 @itemx --input-format @var{format}
2568 The input format to read. @var{format} may be @samp{res}, @samp{rc}, or
2569 @samp{coff}. If no input format is specified, @command{windres} will
2570 guess, as described above.
2572 @item -O @var{format}
2573 @itemx --output-format @var{format}
2574 The output format to generate. @var{format} may be @samp{res},
2575 @samp{rc}, or @samp{coff}. If no output format is specified,
2576 @command{windres} will guess, as described above.
2578 @item -F @var{target}
2579 @itemx --target @var{target}
2580 Specify the BFD format to use for a COFF file as input or output. This
2581 is a BFD target name; you can use the @option{--help} option to see a list
2582 of supported targets. Normally @command{windres} will use the default
2583 format, which is the first one listed by the @option{--help} option.
2585 @ref{Target Selection}.
2588 @item --preprocessor @var{program}
2589 When @command{windres} reads an @code{rc} file, it runs it through the C
2590 preprocessor first. This option may be used to specify the preprocessor
2591 to use, including any leading arguments. The default preprocessor
2592 argument is @code{gcc -E -xc-header -DRC_INVOKED}.
2594 @item --include-dir @var{directory}
2595 Specify an include directory to use when reading an @code{rc} file.
2596 @command{windres} will pass this to the preprocessor as an @option{-I}
2597 option. @command{windres} will also search this directory when looking for
2598 files named in the @code{rc} file.
2600 @item -D @var{target}
2601 @itemx --define @var{sym}[=@var{val}]
2602 Specify a @option{-D} option to pass to the preprocessor when reading an
2606 Enable verbose mode. This tells you what the preprocessor is if you
2609 @item --language @var{val}
2610 Specify the default language to use when reading an @code{rc} file.
2611 @var{val} should be a hexadecimal language code. The low eight bits are
2612 the language, and the high eight bits are the sublanguage.
2614 @item --use-temp-file
2615 Use a temporary file to instead of using popen to read the output of
2616 the preprocessor. Use this option if the popen implementation is buggy
2617 on the host (eg., certain non-English language versions of Windows 95 and
2618 Windows 98 are known to have buggy popen where the output will instead
2621 @item --no-use-temp-file
2622 Use popen, not a temporary file, to read the output of the preprocessor.
2623 This is the default behaviour.
2626 Prints a usage summary.
2629 Prints the version number for @command{windres}.
2632 If @command{windres} is compiled with @code{YYDEBUG} defined as @code{1},
2633 this will turn on parser debugging.
2639 @c man begin SEEALSO windres
2640 the Info entries for @file{binutils}.
2645 @chapter Create files needed to build and use DLLs
2649 @command{dlltool} may be used to create the files needed to build and use
2650 dynamic link libraries (DLLs).
2653 @emph{Warning:} @command{dlltool} is not always built as part of the binary
2654 utilities, since it is only useful for those targets which support DLLs.
2657 @c man title dlltool Create files needed to build and use DLLs.
2660 @c man begin SYNOPSIS dlltool
2661 dlltool [@option{-d}|@option{--input-def} @var{def-file-name}]
2662 [@option{-b}|@option{--base-file} @var{base-file-name}]
2663 [@option{-e}|@option{--output-exp} @var{exports-file-name}]
2664 [@option{-z}|@option{--output-def} @var{def-file-name}]
2665 [@option{-l}|@option{--output-lib} @var{library-file-name}]
2666 [@option{--export-all-symbols}] [@option{--no-export-all-symbols}]
2667 [@option{--exclude-symbols} @var{list}]
2668 [@option{--no-default-excludes}]
2669 [@option{-S}|@option{--as} @var{path-to-assembler}] [@option{-f}|@option{--as-flags} @var{options}]
2670 [@option{-D}|@option{--dllname} @var{name}] [@option{-m}|@option{--machine} @var{machine}]
2671 [@option{-a}|@option{--add-indirect}] [@option{-U}|@option{--add-underscore}] [@option{-k}|@option{--kill-at}]
2672 [@option{-A}|@option{--add-stdcall-alias}]
2673 [@option{-x}|@option{--no-idata4}] [@option{-c}|@option{--no-idata5}] [@option{-i}|@option{--interwork}]
2674 [@option{-n}|@option{--nodelete}] [@option{-v}|@option{--verbose}]
2675 [@option{-h}|@option{--help}] [@option{-V}|@option{--version}]
2676 [object-file @dots{}]
2680 @c man begin DESCRIPTION dlltool
2682 @command{dlltool} reads its inputs, which can come from the @option{-d} and
2683 @option{-b} options as well as object files specified on the command
2684 line. It then processes these inputs and if the @option{-e} option has
2685 been specified it creates a exports file. If the @option{-l} option
2686 has been specified it creates a library file and if the @option{-z} option
2687 has been specified it creates a def file. Any or all of the @option{-e},
2688 @option{-l} and @option{-z} options can be present in one invocation of
2691 When creating a DLL, along with the source for the DLL, it is necessary
2692 to have three other files. @command{dlltool} can help with the creation of
2695 The first file is a @samp{.def} file which specifies which functions are
2696 exported from the DLL, which functions the DLL imports, and so on. This
2697 is a text file and can be created by hand, or @command{dlltool} can be used
2698 to create it using the @option{-z} option. In this case @command{dlltool}
2699 will scan the object files specified on its command line looking for
2700 those functions which have been specially marked as being exported and
2701 put entries for them in the .def file it creates.
2703 In order to mark a function as being exported from a DLL, it needs to
2704 have an @option{-export:<name_of_function>} entry in the @samp{.drectve}
2705 section of the object file. This can be done in C by using the
2709 asm (".section .drectve");
2710 asm (".ascii \"-export:my_func\"");
2712 int my_func (void) @{ @dots{} @}
2715 The second file needed for DLL creation is an exports file. This file
2716 is linked with the object files that make up the body of the DLL and it
2717 handles the interface between the DLL and the outside world. This is a
2718 binary file and it can be created by giving the @option{-e} option to
2719 @command{dlltool} when it is creating or reading in a .def file.
2721 The third file needed for DLL creation is the library file that programs
2722 will link with in order to access the functions in the DLL. This file
2723 can be created by giving the @option{-l} option to dlltool when it
2724 is creating or reading in a .def file.
2726 @command{dlltool} builds the library file by hand, but it builds the
2727 exports file by creating temporary files containing assembler statements
2728 and then assembling these. The @option{-S} command line option can be
2729 used to specify the path to the assembler that dlltool will use,
2730 and the @option{-f} option can be used to pass specific flags to that
2731 assembler. The @option{-n} can be used to prevent dlltool from deleting
2732 these temporary assembler files when it is done, and if @option{-n} is
2733 specified twice then this will prevent dlltool from deleting the
2734 temporary object files it used to build the library.
2736 Here is an example of creating a DLL from a source file @samp{dll.c} and
2737 also creating a program (from an object file called @samp{program.o})
2742 dlltool -e exports.o -l dll.lib dll.o
2743 gcc dll.o exports.o -o dll.dll
2744 gcc program.o dll.lib -o program
2749 @c man begin OPTIONS dlltool
2751 The command line options have the following meanings:
2755 @item -d @var{filename}
2756 @itemx --input-def @var{filename}
2757 @cindex input .def file
2758 Specifies the name of a .def file to be read in and processed.
2760 @item -b @var{filename}
2761 @itemx --base-file @var{filename}
2763 Specifies the name of a base file to be read in and processed. The
2764 contents of this file will be added to the relocation section in the
2765 exports file generated by dlltool.
2767 @item -e @var{filename}
2768 @itemx --output-exp @var{filename}
2769 Specifies the name of the export file to be created by dlltool.
2771 @item -z @var{filename}
2772 @itemx --output-def @var{filename}
2773 Specifies the name of the .def file to be created by dlltool.
2775 @item -l @var{filename}
2776 @itemx --output-lib @var{filename}
2777 Specifies the name of the library file to be created by dlltool.
2779 @item --export-all-symbols
2780 Treat all global and weak defined symbols found in the input object
2781 files as symbols to be exported. There is a small list of symbols which
2782 are not exported by default; see the @option{--no-default-excludes}
2783 option. You may add to the list of symbols to not export by using the
2784 @option{--exclude-symbols} option.
2786 @item --no-export-all-symbols
2787 Only export symbols explicitly listed in an input .def file or in
2788 @samp{.drectve} sections in the input object files. This is the default
2789 behaviour. The @samp{.drectve} sections are created by @samp{dllexport}
2790 attributes in the source code.
2792 @item --exclude-symbols @var{list}
2793 Do not export the symbols in @var{list}. This is a list of symbol names
2794 separated by comma or colon characters. The symbol names should not
2795 contain a leading underscore. This is only meaningful when
2796 @option{--export-all-symbols} is used.
2798 @item --no-default-excludes
2799 When @option{--export-all-symbols} is used, it will by default avoid
2800 exporting certain special symbols. The current list of symbols to avoid
2801 exporting is @samp{DllMain@@12}, @samp{DllEntryPoint@@0},
2802 @samp{impure_ptr}. You may use the @option{--no-default-excludes} option
2803 to go ahead and export these special symbols. This is only meaningful
2804 when @option{--export-all-symbols} is used.
2807 @itemx --as @var{path}
2808 Specifies the path, including the filename, of the assembler to be used
2809 to create the exports file.
2811 @item -f @var{options}
2812 @itemx --as-flags @var{options}
2813 Specifies any specific command line options to be passed to the
2814 assembler when building the exports file. This option will work even if
2815 the @option{-S} option is not used. This option only takes one argument,
2816 and if it occurs more than once on the command line, then later
2817 occurrences will override earlier occurrences. So if it is necessary to
2818 pass multiple options to the assembler they should be enclosed in
2822 @itemx --dll-name @var{name}
2823 Specifies the name to be stored in the .def file as the name of the DLL
2824 when the @option{-e} option is used. If this option is not present, then
2825 the filename given to the @option{-e} option will be used as the name of
2828 @item -m @var{machine}
2829 @itemx -machine @var{machine}
2830 Specifies the type of machine for which the library file should be
2831 built. @command{dlltool} has a built in default type, depending upon how
2832 it was created, but this option can be used to override that. This is
2833 normally only useful when creating DLLs for an ARM processor, when the
2834 contents of the DLL are actually encode using Thumb instructions.
2837 @itemx --add-indirect
2838 Specifies that when @command{dlltool} is creating the exports file it
2839 should add a section which allows the exported functions to be
2840 referenced without using the import library. Whatever the hell that
2844 @itemx --add-underscore
2845 Specifies that when @command{dlltool} is creating the exports file it
2846 should prepend an underscore to the names of the exported functions.
2850 Specifies that when @command{dlltool} is creating the exports file it
2851 should not append the string @samp{@@ <number>}. These numbers are
2852 called ordinal numbers and they represent another way of accessing the
2853 function in a DLL, other than by name.
2856 @itemx --add-stdcall-alias
2857 Specifies that when @command{dlltool} is creating the exports file it
2858 should add aliases for stdcall symbols without @samp{@@ <number>}
2859 in addition to the symbols with @samp{@@ <number>}.
2863 Specifies that when @command{dlltool} is creating the exports and library
2864 files it should omit the @code{.idata4} section. This is for compatibility
2865 with certain operating systems.
2869 Specifies that when @command{dlltool} is creating the exports and library
2870 files it should omit the @code{.idata5} section. This is for compatibility
2871 with certain operating systems.
2875 Specifies that @command{dlltool} should mark the objects in the library
2876 file and exports file that it produces as supporting interworking
2877 between ARM and Thumb code.
2881 Makes @command{dlltool} preserve the temporary assembler files it used to
2882 create the exports file. If this option is repeated then dlltool will
2883 also preserve the temporary object files it uses to create the library
2888 Make dlltool describe what it is doing.
2892 Displays a list of command line options and then exits.
2896 Displays dlltool's version number and then exits.
2903 @c man begin SEEALSO dlltool
2904 the Info entries for @file{binutils}.
2911 @cindex ELF file information
2914 @c man title readelf Displays information about ELF files.
2917 @c man begin SYNOPSIS readelf
2918 readelf [@option{-a}|@option{--all}]
2919 [@option{-h}|@option{--file-header}]
2920 [@option{-l}|@option{--program-headers}|@option{--segments}]
2921 [@option{-S}|@option{--section-headers}|@option{--sections}]
2922 [@option{-e}|@option{--headers}]
2923 [@option{-s}|@option{--syms}|@option{--symbols}]
2924 [@option{-n}|@option{--notes}]
2925 [@option{-r}|@option{--relocs}]
2926 [@option{-u}|@option{--unwind}]
2927 [@option{-d}|@option{--dynamic}]
2928 [@option{-V}|@option{--version-info}]
2929 [@option{-A}|@option{--arch-specific}]
2930 [@option{-D}|@option{--use-dynamic}]
2931 [@option{-x} <number>|@option{--hex-dump=}<number>]
2932 [@option{-w[liaprmfFso]}|
2933 @option{--debug-dump}[=line,=info,=abbrev,=pubnames,=ranges,=macro,=frames,=frames-interp,=str,=loc]]
2934 [@option{-I}|@option{-histogram}]
2935 [@option{-v}|@option{--version}]
2936 [@option{-W}|@option{--wide}]
2937 [@option{-H}|@option{--help}]
2938 @var{elffile}@dots{}
2942 @c man begin DESCRIPTION readelf
2944 @command{readelf} displays information about one or more ELF format object
2945 files. The options control what particular information to display.
2947 @var{elffile}@dots{} are the object files to be examined. At the
2948 moment, @command{readelf} does not support examining archives, nor does it
2949 support examining 64 bit ELF files.
2953 @c man begin OPTIONS readelf
2955 The long and short forms of options, shown here as alternatives, are
2956 equivalent. At least one option besides @samp{-v} or @samp{-H} must be
2962 Equivalent to specifiying @option{--file-header},
2963 @option{--program-headers}, @option{--sections}, @option{--symbols},
2964 @option{--relocs}, @option{--dynamic}, @option{--notes} and
2965 @option{--version-info}.
2968 @itemx --file-header
2969 @cindex ELF file header information
2970 Displays the information contained in the ELF header at the start of the
2974 @itemx --program-headers
2976 @cindex ELF program header information
2977 @cindex ELF segment information
2978 Displays the information contained in the file's segment headers, if it
2983 @itemx --section-headers
2984 @cindex ELF section information
2985 Displays the information contained in the file's section headers, if it
2991 @cindex ELF symbol table information
2992 Displays the entries in symbol table section of the file, if it has one.
2996 Display all the headers in the file. Equivalent to @option{-h -l -S}.
3000 @cindex ELF core notes
3001 Displays the contents of the NOTE segment, if it exists.
3005 @cindex ELF reloc information
3006 Displays the contents of the file's relocation section, if it has one.
3010 @cindex unwind information
3011 Displays the contents of the file's unwind section, if it has one. Only
3012 the unwind sections for IA64 ELF files are currently supported.
3016 @cindex unwind information
3017 Displays the contents of the file's unwind section, if it has one. Only
3018 the unwind sections for IA64 ELF files are currently supported.
3022 @cindex ELF dynamic section information
3023 Displays the contents of the file's dynamic section, if it has one.
3026 @itemx --version-info
3027 @cindex ELF version sections informations
3028 Displays the contents of the version sections in the file, it they
3032 @itemx --arch-specific
3033 Displays architecture-specific information in the file, if there
3037 @itemx --use-dynamic
3038 When displaying symbols, this option makes @command{readelf} use the
3039 symbol table in the file's dynamic section, rather than the one in the
3043 @itemx --hex-dump=<number>
3044 Displays the contents of the indicated section as a hexadecimal dump.
3046 @item -w[liaprmfFso]
3047 @itemx --debug-dump[=line,=info,=abbrev,=pubnames,=ranges,=macro,=frames,=frames-interp,=str,=loc]
3048 Displays the contents of the debug sections in the file, if any are
3049 present. If one of the optional letters or words follows the switch
3050 then only data found in those specific sections will be dumped.
3054 Display a histogram of bucket list lengths when displaying the contents
3055 of the symbol tables.
3059 Display the version number of readelf.
3063 Don't break output lines to fit into 80 columns. By default
3064 @command{readelf} breaks section header and segment listing lines for
3065 64-bit ELF files, so that they fit into 80 columns. This option causes
3066 @command{readelf} to print each section header resp. each segment one a
3067 single line, which is far more readable on terminals wider than 80 columns.
3071 Display the command line options understood by @command{readelf}.
3078 @c man begin SEEALSO readelf
3079 objdump(1), and the Info entries for @file{binutils}.
3083 @node Selecting The Target System
3084 @chapter Selecting the Target System
3086 You can specify two aspects of the target system to the @sc{gnu}
3087 binary file utilities, each in several ways:
3097 In the following summaries, the lists of ways to specify values are in
3098 order of decreasing precedence. The ways listed first override those
3101 The commands to list valid values only list the values for which the
3102 programs you are running were configured. If they were configured with
3103 @option{--enable-targets=all}, the commands list most of the available
3104 values, but a few are left out; not all targets can be configured in at
3105 once because some of them can only be configured @dfn{native} (on hosts
3106 with the same type as the target system).
3109 * Target Selection::
3110 * Architecture Selection::
3113 @node Target Selection
3114 @section Target Selection
3116 A @dfn{target} is an object file format. A given target may be
3117 supported for multiple architectures (@pxref{Architecture Selection}).
3118 A target selection may also have variations for different operating
3119 systems or architectures.
3121 The command to list valid target values is @samp{objdump -i}
3122 (the first column of output contains the relevant information).
3124 Some sample values are: @samp{a.out-hp300bsd}, @samp{ecoff-littlemips},
3125 @samp{a.out-sunos-big}.
3127 You can also specify a target using a configuration triplet. This is
3128 the same sort of name that is passed to @file{configure} to specify a
3129 target. When you use a configuration triplet as an argument, it must be
3130 fully canonicalized. You can see the canonical version of a triplet by
3131 running the shell script @file{config.sub} which is included with the
3134 Some sample configuration triplets are: @samp{m68k-hp-bsd},
3135 @samp{mips-dec-ultrix}, @samp{sparc-sun-sunos}.
3137 @subheading @command{objdump} Target
3143 command line option: @option{-b} or @option{--target}
3146 environment variable @code{GNUTARGET}
3149 deduced from the input file
3152 @subheading @command{objcopy} and @command{strip} Input Target
3158 command line options: @option{-I} or @option{--input-target}, or @option{-F} or @option{--target}
3161 environment variable @code{GNUTARGET}
3164 deduced from the input file
3167 @subheading @command{objcopy} and @command{strip} Output Target
3173 command line options: @option{-O} or @option{--output-target}, or @option{-F} or @option{--target}
3176 the input target (see ``@command{objcopy} and @command{strip} Input Target'' above)
3179 environment variable @code{GNUTARGET}
3182 deduced from the input file
3185 @subheading @command{nm}, @command{size}, and @command{strings} Target
3191 command line option: @option{--target}
3194 environment variable @code{GNUTARGET}
3197 deduced from the input file
3200 @node Architecture Selection
3201 @section Architecture Selection
3203 An @dfn{architecture} is a type of @sc{cpu} on which an object file is
3204 to run. Its name may contain a colon, separating the name of the
3205 processor family from the name of the particular @sc{cpu}.
3207 The command to list valid architecture values is @samp{objdump -i} (the
3208 second column contains the relevant information).
3210 Sample values: @samp{m68k:68020}, @samp{mips:3000}, @samp{sparc}.
3212 @subheading @command{objdump} Architecture
3218 command line option: @option{-m} or @option{--architecture}
3221 deduced from the input file
3224 @subheading @command{objcopy}, @command{nm}, @command{size}, @command{strings} Architecture
3230 deduced from the input file
3233 @node Reporting Bugs
3234 @chapter Reporting Bugs
3236 @cindex reporting bugs
3238 Your bug reports play an essential role in making the binary utilities
3241 Reporting a bug may help you by bringing a solution to your problem, or
3242 it may not. But in any case the principal function of a bug report is
3243 to help the entire community by making the next version of the binary
3244 utilities work better. Bug reports are your contribution to their
3247 In order for a bug report to serve its purpose, you must include the
3248 information that enables us to fix the bug.
3251 * Bug Criteria:: Have you found a bug?
3252 * Bug Reporting:: How to report bugs
3256 @section Have You Found a Bug?
3257 @cindex bug criteria
3259 If you are not sure whether you have found a bug, here are some guidelines:
3262 @cindex fatal signal
3265 If a binary utility gets a fatal signal, for any input whatever, that is
3266 a bug. Reliable utilities never crash.
3268 @cindex error on valid input
3270 If a binary utility produces an error message for valid input, that is a
3274 If you are an experienced user of binary utilities, your suggestions for
3275 improvement are welcome in any case.
3279 @section How to Report Bugs
3281 @cindex bugs, reporting
3283 A number of companies and individuals offer support for @sc{gnu}
3284 products. If you obtained the binary utilities from a support
3285 organization, we recommend you contact that organization first.
3287 You can find contact information for many support companies and
3288 individuals in the file @file{etc/SERVICE} in the @sc{gnu} Emacs
3291 In any event, we also recommend that you send bug reports for the binary
3292 utilities to @samp{bug-binutils@@gnu.org}.
3294 The fundamental principle of reporting bugs usefully is this:
3295 @strong{report all the facts}. If you are not sure whether to state a
3296 fact or leave it out, state it!
3298 Often people omit facts because they think they know what causes the
3299 problem and assume that some details do not matter. Thus, you might
3300 assume that the name of a file you use in an example does not matter.
3301 Well, probably it does not, but one cannot be sure. Perhaps the bug is
3302 a stray memory reference which happens to fetch from the location where
3303 that pathname is stored in memory; perhaps, if the pathname were
3304 different, the contents of that location would fool the utility into
3305 doing the right thing despite the bug. Play it safe and give a
3306 specific, complete example. That is the easiest thing for you to do,
3307 and the most helpful.
3309 Keep in mind that the purpose of a bug report is to enable us to fix the bug if
3310 it is new to us. Therefore, always write your bug reports on the assumption
3311 that the bug has not been reported previously.
3313 Sometimes people give a few sketchy facts and ask, ``Does this ring a
3314 bell?'' This cannot help us fix a bug, so it is basically useless. We
3315 respond by asking for enough details to enable us to investigate.
3316 You might as well expedite matters by sending them to begin with.
3318 To enable us to fix the bug, you should include all these things:
3322 The version of the utility. Each utility announces it if you start it
3323 with the @option{--version} argument.
3325 Without this, we will not know whether there is any point in looking for
3326 the bug in the current version of the binary utilities.
3329 Any patches you may have applied to the source, including any patches
3330 made to the @code{BFD} library.
3333 The type of machine you are using, and the operating system name and
3337 What compiler (and its version) was used to compile the utilities---e.g.
3341 The command arguments you gave the utility to observe the bug. To
3342 guarantee you will not omit something important, list them all. A copy
3343 of the Makefile (or the output from make) is sufficient.
3345 If we were to try to guess the arguments, we would probably guess wrong
3346 and then we might not encounter the bug.
3349 A complete input file, or set of input files, that will reproduce the
3350 bug. If the utility is reading an object file or files, then it is
3351 generally most helpful to send the actual object files, uuencoded if
3352 necessary to get them through the mail system. Note that
3353 @samp{bug-binutils@@gnu.org} is a mailing list, so you should avoid
3354 sending very large files to it. Making the files available for
3355 anonymous FTP is OK.
3357 If the source files were produced exclusively using @sc{gnu} programs
3358 (e.g., @command{gcc}, @command{gas}, and/or the @sc{gnu} @command{ld}), then it
3359 may be OK to send the source files rather than the object files. In
3360 this case, be sure to say exactly what version of @command{gcc}, or
3361 whatever, was used to produce the object files. Also say how
3362 @command{gcc}, or whatever, was configured.
3365 A description of what behavior you observe that you believe is
3366 incorrect. For example, ``It gets a fatal signal.''
3368 Of course, if the bug is that the utility gets a fatal signal, then we
3369 will certainly notice it. But if the bug is incorrect output, we might
3370 not notice unless it is glaringly wrong. You might as well not give us
3371 a chance to make a mistake.
3373 Even if the problem you experience is a fatal signal, you should still
3374 say so explicitly. Suppose something strange is going on, such as your
3375 copy of the utility is out of synch, or you have encountered a bug in
3376 the C library on your system. (This has happened!) Your copy might
3377 crash and ours would not. If you told us to expect a crash, then when
3378 ours fails to crash, we would know that the bug was not happening for
3379 us. If you had not told us to expect a crash, then we would not be able
3380 to draw any conclusion from our observations.
3383 If you wish to suggest changes to the source, send us context diffs, as
3384 generated by @command{diff} with the @option{-u}, @option{-c}, or @option{-p}
3385 option. Always send diffs from the old file to the new file. If you
3386 wish to discuss something in the @command{ld} source, refer to it by
3387 context, not by line number.
3389 The line numbers in our development sources will not match those in your
3390 sources. Your line numbers would convey no useful information to us.
3393 Here are some things that are not necessary:
3397 A description of the envelope of the bug.
3399 Often people who encounter a bug spend a lot of time investigating
3400 which changes to the input file will make the bug go away and which
3401 changes will not affect it.
3403 This is often time consuming and not very useful, because the way we
3404 will find the bug is by running a single example under the debugger
3405 with breakpoints, not by pure deduction from a series of examples.
3406 We recommend that you save your time for something else.
3408 Of course, if you can find a simpler example to report @emph{instead}
3409 of the original one, that is a convenience for us. Errors in the
3410 output will be easier to spot, running under the debugger will take
3411 less time, and so on.
3413 However, simplification is not vital; if you do not want to do this,
3414 report the bug anyway and send us the entire test case you used.
3417 A patch for the bug.
3419 A patch for the bug does help us if it is a good one. But do not omit
3420 the necessary information, such as the test case, on the assumption that
3421 a patch is all we need. We might see problems with your patch and decide
3422 to fix the problem another way, or we might not understand it at all.
3424 Sometimes with programs as complicated as the binary utilities it is
3425 very hard to construct an example that will make the program follow a
3426 certain path through the code. If you do not send us the example, we
3427 will not be able to construct one, so we will not be able to verify that
3430 And if we cannot understand what bug you are trying to fix, or why your
3431 patch should be an improvement, we will not install it. A test case will
3432 help us to understand.
3435 A guess about what the bug is or what it depends on.
3437 Such guesses are usually wrong. Even we cannot guess right about such
3438 things without first using the debugger to find the facts.