gcc/config/svr4.h

   1 /* Operating system specific defines to be used when targeting GCC for some
   2    generic System V Release 4 system.
   3    Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999,
   4    2000, 2001 Free Software Foundation, Inc.
   5    Contributed by Ron Guilmette (rfg@monkeys.com).
   6
   7 This file is part of GNU CC.
   8
   9 GNU CC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GNU CC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU CC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, USA.
  23
  24    To use this file, make up a line like that in config.gcc:
  25
  26         tm_file="$tm_file elfos.h svr4.h MACHINE/svr4.h"
  27
  28    where MACHINE is replaced by the name of the basic hardware that you
  29    are targeting for.  Then, in the file MACHINE/svr4.h, put any really
  30    system-specific defines (or overrides of defines) which you find that
  31    you need.  For example, CPP_PREDEFINES is defined here with only the
  32    defined -Dunix and -DSVR4.  You should probably override that in your
  33    target-specific MACHINE/svr4.h file with a set of defines that
  34    includes these, but also contains an appropriate define for the type
  35    of hardware that you are targeting.
  36 */
  37
  38 /* Define a symbol indicating that we are using svr4.h.  */
  39 #define USING_SVR4_H
  40
  41 /* Cpp, assembler, linker, library, and startfile spec's.  */
  42
  43 /* This defines which switch letters take arguments.  On svr4, most of
  44    the normal cases (defined in gcc.c) apply, and we also have -h* and
  45    -z* options (for the linker).  Note however that there is no such
  46    thing as a -T option for svr4.  */
  47
  48 #define SWITCH_TAKES_ARG(CHAR)          \
  49   (DEFAULT_SWITCH_TAKES_ARG (CHAR)      \
  50    || (CHAR) == 'h'                     \
  51    || (CHAR) == 'x'                     \
  52    || (CHAR) == 'z')
  53
  54 /* This defines which multi-letter switches take arguments.  On svr4,
  55    there are no such switches except those implemented by GCC itself.  */
  56
  57 #define WORD_SWITCH_TAKES_ARG(STR)                      \
  58  (DEFAULT_WORD_SWITCH_TAKES_ARG (STR)                   \
  59   && strcmp (STR, "Tdata") && strcmp (STR, "Ttext")     \
  60   && strcmp (STR, "Tbss"))
  61
  62 /* You should redefine CPP_PREDEFINES in any file which includes this one.
  63    The definition should be appropriate for the type of target system
  64    involved, and it should include any -A (assertion) options which are
  65    appropriate for the given target system.  */
  66 #undef CPP_PREDEFINES
  67
  68 /* Provide an ASM_SPEC appropriate for svr4.  Here we try to support as
  69    many of the specialized svr4 assembler options as seems reasonable,
  70    given that there are certain options which we can't (or shouldn't)
  71    support directly due to the fact that they conflict with other options
  72    for other svr4 tools (e.g. ld) or with other options for GCC itself.
  73    For example, we don't support the -o (output file) or -R (remove
  74    input file) options because GCC already handles these things.  We
  75    also don't support the -m (run m4) option for the assembler because
  76    that conflicts with the -m (produce load map) option of the svr4
  77    linker.  We do however allow passing arbitrary options to the svr4
  78    assembler via the -Wa, option.
  79
  80    Note that gcc doesn't allow a space to follow -Y in a -Ym,* or -Yd,*
  81    option.
  82
  83    The svr4 assembler wants '-' on the command line if it's expected to
  84    read its stdin.
  85 */
  86
  87 #undef  ASM_SPEC
  88 #define ASM_SPEC \
  89   "%{v:-V} %{Qy:} %{!Qn:-Qy} %{n} %{T} %{Ym,*} %{Yd,*} %{Wa,*:%*}"
  90
  91 #define AS_NEEDS_DASH_FOR_PIPED_INPUT
  92
  93 /* Under svr4, the normal location of the `ld' and `as' programs is the
  94    /usr/ccs/bin directory.  */
  95
  96 #ifndef CROSS_COMPILE
  97 #undef  MD_EXEC_PREFIX
  98 #define MD_EXEC_PREFIX "/usr/ccs/bin/"
  99 #endif
 100
 101 /* Under svr4, the normal location of the various *crt*.o files is the
 102    /usr/ccs/lib directory.  */
 103
 104 #ifndef CROSS_COMPILE
 105 #undef  MD_STARTFILE_PREFIX
 106 #define MD_STARTFILE_PREFIX "/usr/ccs/lib/"
 107 #endif
 108
 109 /* Provide a LIB_SPEC appropriate for svr4.  Here we tack on the default
 110    standard C library (unless we are building a shared library).  */
 111
 112 #undef  LIB_SPEC
 113 #define LIB_SPEC "%{!shared:%{!symbolic:-lc}}"
 114
 115 /* Provide an ENDFILE_SPEC appropriate for svr4.  Here we tack on our own
 116    magical crtend.o file (see crtstuff.c) which provides part of the
 117    support for getting C++ file-scope static object constructed before
 118    entering `main', followed by the normal svr3/svr4 "finalizer" file,
 119    which is either `gcrtn.o' or `crtn.o'.  */
 120
 121 #undef  ENDFILE_SPEC
 122 #define ENDFILE_SPEC "crtend.o%s %{pg:gcrtn.o%s}%{!pg:crtn.o%s}"
 123
 124 /* Provide a LINK_SPEC appropriate for svr4.  Here we provide support
 125    for the special GCC options -static, -shared, and -symbolic which
 126    allow us to link things in one of these three modes by applying the
 127    appropriate combinations of options at link-time.  We also provide
 128    support here for as many of the other svr4 linker options as seems
 129    reasonable, given that some of them conflict with options for other
 130    svr4 tools (e.g. the assembler).  In particular, we do support the
 131    -z*, -V, -b, -t, -Qy, -Qn, and -YP* options here, and the -e*, -l*,
 132    -o*, -r, -s, -u*, and -L* options are directly supported by gcc.c
 133    itself.  We don't directly support the -m (generate load map)
 134    option because that conflicts with the -m (run m4) option of the
 135    svr4 assembler.  We also don't directly support the svr4 linker's
 136    -I* or -M* options because these conflict with existing GCC
 137    options.  We do however allow passing arbitrary options to the svr4
 138    linker via the -Wl, option, in gcc.c.  We don't support the svr4
 139    linker's -a option at all because it is totally useless and because
 140    it conflicts with GCC's own -a option.
 141
 142    Note that gcc doesn't allow a space to follow -Y in a -YP,* option.
 143
 144    When the -G link option is used (-shared and -symbolic) a final link is
 145    not being done.  */
 146
 147 #undef  LINK_SPEC
 148 #ifdef CROSS_COMPILE
 149 #define LINK_SPEC "%{h*} %{v:-V} \
 150                    %{b} \
 151                    %{static:-dn -Bstatic} \
 152                    %{shared:-G -dy -z text} \
 153                    %{symbolic:-Bsymbolic -G -dy -z text} \
 154                    %{G:-G} \
 155                    %{YP,*} \
 156                    %{Qy:} %{!Qn:-Qy}"
 157 #else
 158 #define LINK_SPEC "%{h*} %{v:-V} \
 159                    %{b} \
 160                    %{static:-dn -Bstatic} \
 161                    %{shared:-G -dy -z text} \
 162                    %{symbolic:-Bsymbolic -G -dy -z text} \
 163                    %{G:-G} \
 164                    %{YP,*} \
 165                    %{!YP,*:%{p:-Y P,/usr/ccs/lib/libp:/usr/lib/libp:/usr/ccs/lib:/usr/lib} \
 166                     %{!p:-Y P,/usr/ccs/lib:/usr/lib}} \
 167                    %{Qy:} %{!Qn:-Qy}"
 168 #endif
 169
 170 /* Gcc automatically adds in one of the files /usr/ccs/lib/values-Xc.o
 171    or /usr/ccs/lib/values-Xa.o for each final link step (depending
 172    upon the other gcc options selected, such as -ansi).  These files
 173    each contain one (initialized) copy of a special variable called
 174    `_lib_version'.  Each one of these files has `_lib_version' initialized
 175    to a different (enum) value.  The SVR4 library routines query the
 176    value of `_lib_version' at run to decide how they should behave.
 177    Specifically, they decide (based upon the value of `_lib_version')
 178    if they will act in a strictly ANSI conforming manner or not.  */
 179
 180 #undef  STARTFILE_SPEC
 181 #define STARTFILE_SPEC "%{!shared: \
 182                          %{!symbolic: \
 183                           %{pg:gcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}}}\
 184                         %{pg:gcrti.o%s}%{!pg:crti.o%s} \
 185                         %{ansi:values-Xc.o%s} \
 186                         %{!ansi:values-Xa.o%s} \
 187                         crtbegin.o%s"
 188
 189 /* The numbers used to denote specific machine registers in the System V
 190    Release 4 DWARF debugging information are quite likely to be totally
 191    different from the numbers used in BSD stabs debugging information
 192    for the same kind of target machine.  Thus, we undefine the macro
 193    DBX_REGISTER_NUMBER here as an extra inducement to get people to
 194    provide proper machine-specific definitions of DBX_REGISTER_NUMBER
 195    (which is also used to provide DWARF registers numbers in dwarfout.c)
 196    in their tm.h files which include this file.  */
 197
 198 #undef DBX_REGISTER_NUMBER
 199
 200 /* Define the actual types of some ANSI-mandated types.  (These
 201    definitions should work for most SVR4 systems).  */
 202
 203 #undef  SIZE_TYPE
 204 #define SIZE_TYPE "unsigned int"
 205
 206 #undef  PTRDIFF_TYPE
 207 #define PTRDIFF_TYPE "int"
 208
 209 #undef  WCHAR_TYPE
 210 #define WCHAR_TYPE "long int"
 211
 212 #undef  WCHAR_TYPE_SIZE
 213 #define WCHAR_TYPE_SIZE BITS_PER_WORD
 214
 215 /* This causes trouble, because it requires the host machine
 216    to support ANSI C.  */
 217 /* #define MULTIBYTE_CHARS */
 218
 219 #define TARGET_HAS_F_SETLKW