Makeconfig

   1 # Copyright (C) 1991-2003,2004,2005,2006,2007,2008,2009,2010,2011,2012
   2 #       Free Software Foundation, Inc.
   3 # This file is part of the GNU C Library.
   4
   5 # The GNU C Library is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU Lesser General Public
   7 # License as published by the Free Software Foundation; either
   8 # version 2.1 of the License, or (at your option) any later version.
   9
  10 # The GNU C Library is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # Lesser General Public License for more details.
  14
  15 # You should have received a copy of the GNU Lesser General Public
  16 # License along with the GNU C Library; if not, see
  17 # <http://www.gnu.org/licenses/>.
  18
  19 #
  20 #       Makefile configuration options for the GNU C library.
  21 #
  22 ifneq (,)
  23 This makefile requires GNU Make.
  24 endif
  25
  26 all: # Make this the default goal
  27
  28 ifneq "$(origin +included-Makeconfig)" "file"
  29
  30 +included-Makeconfig := yes
  31
  32 ifdef subdir
  33 .. := ../
  34 endif
  35
  36 # If config.make exists, the source directory was configured,
  37 # so don't try to be clever and find another directory to build in.
  38 ifneq (,$(wildcard $(..)config.make))
  39 ARCH =
  40 machine =
  41 else    # Not configured.
  42 ifndef ARCH
  43 ifdef machine
  44 ARCH = $(machine)
  45 endif # machine
  46 endif # ARCH
  47 endif # config.make
  48
  49 # Directory for object files and libc.a.  If this is not defined, the
  50 # object files live in the subdirectories where their sources live, and
  51 # libc.a lives in the parent directory (this probably doesn't work any
  52 # more).
  53 ifdef ARCH
  54 ifeq ($(filter /%,$(ARCH)),)
  55 objdir := $(..)$(ARCH)
  56 else
  57 objdir = $(ARCH)
  58 endif
  59 endif
  60
  61 # $(common-objdir) is the place to put objects and
  62 # such that are not specific to a single subdir.
  63 ifdef objdir
  64 objpfx := $(patsubst %//,%/,$(objdir)/$(subdir)/)
  65 common-objpfx = $(objdir)/
  66 common-objdir = $(objdir)
  67 else
  68 objpfx :=
  69 ifdef ..
  70 common-objpfx = $(..)
  71 common-objdir = ..
  72 else
  73 # This is a kludge.  make wizards might grok.
  74 common-objpfx = sysdeps/../
  75 common-objdir = .
  76 endif
  77 endif
  78
  79 # Root of the sysdeps tree.
  80 sysdep_dir := $(..)sysdeps
  81 export sysdep_dir := $(sysdep_dir)
  82
  83 # Get the values defined by options to `configure'.
  84 include $(common-objpfx)config.make
  85
  86 # What flags to give to sources which call user provided callbacks
  87 uses-callbacks = $(exceptions)
  88
  89 # What flags to give to tests which test stack alignment
  90 stack-align-test-flags =
  91
  92 # We have a special subdir for each binary format.
  93 # For now, only ELF is fully supported.
  94 binfmt-subdir = elf
  95
  96 # Complete path to sysdep dirs.
  97 # `configure' writes a definition of `config-sysdirs' in `config.make'.
  98 sysdirs := $(foreach D,$(config-sysdirs),$(firstword $(filter /%,$D) $(..)$D))
  99
 100 # Add-ons that contribute sysdeps trees get added to the include list
 101 # after sysdeps/generic.  This makes #include <sysdeps/...> work right
 102 # to find specific add-on files without assuming the add-on directory name.
 103 # It also means that headers can go into an add-on's base directory
 104 # instead of the add-on needing a sysdeps/generic of its own.
 105 sysdeps-srcdirs := $(foreach add-on,$(sysdeps-add-ons),\
 106                              $(firstword $(filter /%,$(add-on)) \
 107                                          $(..)$(add-on)))
 108 +sysdep_dirs = $(sysdirs) $(sysdeps-srcdirs)
 109 ifdef objdir
 110 +sysdep_dirs := $(objdir) $(+sysdep_dirs)
 111 endif
 112
 113 # Run config.status to update config.make and config.h.  We don't show the
 114 # dependence of config.h to Make, because it is only touched when it
 115 # changes and so config.status would be run every time; the dependence of
 116 # config.make should suffice to force regeneration and re-exec, and the new
 117 # image will notice if config.h changed.
 118 $(common-objpfx)config.make: $(common-objpfx)config.status \
 119                              $(..)config.make.in $(..)config.h.in
 120         cd $(<D); $(SHELL) $(<F)
 121
 122 # Find all the add-on and sysdeps configure fragments, to make sure we
 123 # re-run configure when any of them changes.
 124 $(common-objpfx)config.status: $(..)version.h $(..)configure \
 125                                $(foreach dir,$(sysdirs),\
 126                                          $(wildcard $(dir)/Implies) \
 127                                          $(patsubst %.in,%,\
 128                                                     $(firstword $(wildcard \
 129  $(addprefix $(dir)/,configure configure.in))))) \
 130                                $(patsubst %.in,%,\
 131                                           $(foreach add-on,$(add-ons),\
 132                                                     $(firstword $(wildcard \
 133  $(addprefix $(firstword $(filter /%,$(add-on)) $(..)$(add-on))/,\
 134              configure configure.in)))))
 135         @cd $(@D); if test -f $(@F); then exec $(SHELL) $(@F) --recheck; else \
 136          echo The GNU C library has not been configured. >&2; \
 137          echo Run \`configure\' to configure it before building. >&2; \
 138          echo Try \`configure --help\' for more details. >&2; \
 139          exit 1; fi
 140
 141 # We don't want CPPFLAGS to be exported to the command running configure.
 142 unexport CPPFLAGS
 143
 144 # Get the user's configuration parameters.
 145 ifneq ($(wildcard $(..)configparms),)
 146 include $(..)configparms
 147 endif
 148 ifneq ($(objpfx),)
 149 ifneq ($(wildcard $(common-objpfx)configparms),)
 150 include $(common-objpfx)configparms
 151 endif
 152 endif
 153 \f
 154 ####
 155 ####    These are the configuration variables.  You can define values for
 156 ####    the variables below in the file `configparms'.
 157 ####    Do NOT edit this file.
 158 ####
 159
 160
 161 # Common prefix for machine-independent installation directories.
 162 ifeq ($(origin prefix),undefined) # ifndef would override explicit empty value.
 163 prefix = /usr/local
 164 endif
 165
 166 # Decide whether we shall build the programs or not.  We always do this
 167 # unless the user tells us (in configparms) or we are building for a
 168 # standalone target.
 169 ifndef build-programs
 170 ifneq ($(config-os),none)
 171 build-programs=yes
 172 else
 173 build-programs=no
 174 endif
 175 endif
 176
 177 # Common prefix for machine-dependent installation directories.
 178 ifeq ($(origin exec_prefix),undefined)
 179 exec_prefix = $(prefix)
 180 endif
 181
 182 # Where to install the library and object files.
 183 ifndef libdir
 184 libdir = $(exec_prefix)/lib
 185 endif
 186 inst_libdir = $(install_root)$(libdir)
 187
 188 # Where to install the shared library and dynamic linker.
 189 ifndef slibdir
 190 slibdir = $(exec_prefix)/lib
 191 endif
 192 inst_slibdir = $(install_root)$(slibdir)
 193
 194 # Prefix to put on files installed in $(libdir).  For libraries `libNAME.a',
 195 # the prefix is spliced between `lib' and the name, so the linker switch
 196 # `-l$(libprefix)NAME' finds the library; for other files the prefix is
 197 # just prepended to the whole file name.
 198 ifeq ($(origin libprefix),undefined)
 199 libprefix =
 200 endif
 201
 202 # Where to install the header files.
 203 ifndef includedir
 204 includedir = $(prefix)/include
 205 endif
 206 inst_includedir = $(install_root)$(includedir)
 207
 208 # Where to install machine-independent data files.
 209 # These are the timezone database, and the locale database.
 210 ifndef datadir
 211 datadir = $(prefix)/share
 212 endif
 213 inst_datadir = $(install_root)$(datadir)
 214
 215 # Where to install the timezone data files (which are machine-independent).
 216 ifndef zonedir
 217 zonedir = $(datadir)/zoneinfo
 218 endif
 219 inst_zonedir = $(install_root)$(zonedir)
 220
 221 # Where to install the locale files.
 222 ifndef localedir
 223 localedir = $(libdir)/locale
 224 endif
 225 inst_localedir = $(install_root)$(localedir)
 226
 227 # Where to install the message catalog data files (which are
 228 # machine-independent).
 229 ifndef msgcatdir
 230 msgcatdir = $(datadir)/locale
 231 endif
 232 inst_msgcatdir = $(install_root)$(msgcatdir)
 233
 234 # Where to install the locale charmap source files.
 235 ifndef i18ndir
 236 i18ndir = $(datadir)/i18n
 237 endif
 238 inst_i18ndir = $(install_root)$(i18ndir)
 239
 240 # Where to install the shared object for charset transformation.
 241 ifndef gconvdir
 242 gconvdir = $(libdir)/gconv
 243 endif
 244 inst_gconvdir = $(install_root)$(gconvdir)
 245
 246 # Where to install programs.
 247 ifndef bindir
 248 bindir = $(exec_prefix)/bin
 249 endif
 250 inst_bindir = $(install_root)$(bindir)
 251
 252 # Where to install internal programs.
 253 ifndef libexecdir
 254 libexecdir = $(exec_prefix)/libexec
 255 endif
 256 inst_libexecdir = $(install_root)$(libexecdir)
 257
 258 # Where to install administrative programs.
 259 ifndef rootsbindir
 260 rootsbindir = $(exec_prefix)/sbin
 261 endif
 262 inst_rootsbindir = $(install_root)$(rootsbindir)
 263
 264 ifndef sbindir
 265 sbindir = $(exec_prefix)/sbin
 266 endif
 267 inst_sbindir = $(install_root)$(sbindir)
 268
 269 # Where to install the Info files.
 270 ifndef infodir
 271 infodir = $(prefix)/info
 272 endif
 273 inst_infodir = $(install_root)$(infodir)
 274
 275 # Where to install audit libraries.
 276 ifndef auditdir
 277 auditdir = $(libdir)/audit
 278 endif
 279 inst_auditdir = $(install_root)$(auditdir)
 280
 281 # Where to install default configuration files.  These include the local
 282 # timezone specification and network data base files.
 283 ifndef sysconfdir
 284 sysconfdir = $(prefix)/etc
 285 endif
 286 inst_sysconfdir = $(install_root)$(sysconfdir)
 287
 288 # Directory for the database files and Makefile for nss_db.
 289 ifndef vardbdir
 290 vardbdir = /var/db
 291 endif
 292 inst_vardbdir = $(install_root)$(vardbdir)
 293
 294 # Where to install the "localtime" timezone file; this is the file whose
 295 # contents $(localtime) specifies.  If this is a relative pathname, it is
 296 # relative to $(zonedir).  It is a good idea to put this somewhere
 297 # other than there, so the zoneinfo directory contains only universal data,
 298 # localizing the configuration data elsewhere.
 299 ifndef localtime-file
 300 localtime-file = $(sysconfdir)/localtime
 301 endif
 302
 303 # What to use for leap second specifications in compiling the default
 304 # timezone files.  Set this to `/dev/null' for no leap second handling as
 305 # 1003.1 requires, or to `leapseconds' for proper leap second handling.
 306 # Both zone flavors are always available as `posix/ZONE' and `right/ZONE'.
 307 # This variable determines the default: if it's `/dev/null',
 308 # ZONE==posix/ZONE; if it's `leapseconds', ZONE==right/ZONE.
 309 ifndef leapseconds
 310 leapseconds = /dev/null
 311 endif
 312
 313 # What timezone's DST rules should be used when a POSIX-style TZ
 314 # environment variable doesn't specify any rules.  For 1003.1 compliance
 315 # this timezone must use rules that are as U.S. federal law defines DST.
 316 # Run `make -C time echo-zonenames' to see a list of available zone names.
 317 # This setting can be changed with `zic -p TIMEZONE' at any time.
 318 # If you want POSIX.1 compatibility, use `America/New_York'.
 319 ifndef posixrules
 320 posixrules = America/New_York
 321 endif
 322
 323 # Where to install the "posixrules" timezone file; this is file
 324 # whose contents $(posixrules) specifies.  If this is a relative
 325 # pathname, it is relative to $(zonedir).
 326 ifndef posixrules-file
 327 posixrules-file = posixrules
 328 endif
 329
 330
 331 # Directory where your system's native header files live.
 332 # This is used on Unix systems to generate some GNU libc header files.
 333 ifndef sysincludedir
 334 sysincludedir = /usr/include
 335 endif
 336
 337
 338 # Commands to install files.
 339 ifndef INSTALL_DATA
 340 INSTALL_DATA = $(INSTALL) -m 644
 341 endif
 342 ifndef INSTALL_SCRIPT
 343 INSTALL_SCRIPT = $(INSTALL)
 344 endif
 345 ifndef INSTALL_PROGRAM
 346 INSTALL_PROGRAM = $(INSTALL)
 347 endif
 348 ifndef INSTALL
 349 INSTALL = install
 350 endif
 351
 352
 353 # The name of the C compiler.
 354 # If you've got GCC, and it works, use it.
 355 ifeq ($(origin CC),default)
 356 CC := gcc
 357 endif
 358
 359 # The name of the C compiler to use for compilations of programs to run on
 360 # the host that is building the library.  If you set CC to a
 361 # cross-compiler, you must set this to the normal compiler.
 362 ifndef BUILD_CC
 363 BUILD_CC = $(CC)
 364 endif
 365
 366 # Default flags to pass the C compiler.
 367 ifndef default_cflags
 368 ifeq ($(release),stable)
 369 default_cflags := -g -O2
 370 else
 371 default_cflags := -g -O
 372 endif
 373 endif
 374
 375 # Flags to pass the C compiler when assembling preprocessed assembly code
 376 # (`.S' files).  On some systems the assembler doesn't understand the `#' line
 377 # directives the preprocessor produces.  If you have troubling compiling
 378 # assembly code, try using -P here to suppress these directives.
 379 ifndef asm-CPPFLAGS
 380 asm-CPPFLAGS =
 381 endif
 382
 383 as-needed := -Wl,--as-needed
 384 no-as-needed := -Wl,--no-as-needed
 385
 386 # Must be supported by the linker.
 387 no-whole-archive = -Wl,--no-whole-archive
 388 whole-archive = -Wl,--whole-archive
 389
 390 # Installed name of the startup code.
 391 # The ELF convention is that the startfile is called crt1.o
 392 start-installed-name = crt1.o
 393 # On systems that do not need a special startfile for statically linked
 394 # binaries, simply set it to the normal name.
 395 ifndef static-start-installed-name
 396 static-start-installed-name = $(start-installed-name)
 397 endif
 398
 399 ifeq (yesyes,$(build-shared)$(have-z-combreloc))
 400 combreloc-LDFLAGS = -Wl,-z,combreloc
 401 LDFLAGS.so += $(combreloc-LDFLAGS)
 402 LDFLAGS-rtld += $(combreloc-LDFLAGS)
 403 endif
 404
 405 relro-LDFLAGS = -Wl,-z,relro
 406 LDFLAGS.so += $(relro-LDFLAGS)
 407 LDFLAGS-rtld += $(relro-LDFLAGS)
 408
 409 ifeq (yes,$(have-hash-style))
 410 # For the time being we unconditionally use 'both'.  At some time we
 411 # should declare statically linked code as 'out of luck' and compile
 412 # with --hash-style=gnu only.
 413 hashstyle-LDFLAGS = -Wl,--hash-style=both
 414 LDFLAGS.so += $(hashstyle-LDFLAGS)
 415 LDFLAGS-rtld += $(hashstyle-LDFLAGS)
 416 endif
 417
 418 # Command for linking programs with the C library.
 419 ifndef +link
 420 +link = $(CC) -nostdlib -nostartfiles -o $@ \
 421               $(sysdep-LDFLAGS) $(config-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
 422               $(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
 423               $(addprefix $(csu-objpfx),$(start-installed-name)) \
 424               $(+preinit) $(+prector) \
 425               $(filter-out $(addprefix $(csu-objpfx),start.o \
 426                                                      $(start-installed-name))\
 427                            $(+preinit) $(link-extra-libs) \
 428                            $(common-objpfx)libc% $(+postinit),$^) \
 429               $(link-extra-libs) $(link-libc) $(+postctor) $(+postinit)
 430 endif
 431 # Command for linking PIE programs with the C library.
 432 ifndef +link-pie
 433 +link-pie = $(CC) -pie -Wl,-O1 -nostdlib -nostartfiles -o $@ \
 434              $(sysdep-LDFLAGS) $(config-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
 435              $(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
 436              $(addprefix $(csu-objpfx),S$(start-installed-name)) \
 437              $(+preinit) $(+prectorS) \
 438              $(filter-out $(addprefix $(csu-objpfx),start.o \
 439                                                     S$(start-installed-name))\
 440                           $(+preinit) $(link-extra-libs) \
 441                           $(common-objpfx)libc% $(+postinit),$^) \
 442              $(link-extra-libs) $(link-libc) $(+postctorS) $(+postinit)
 443 endif
 444 # Command for statically linking programs with the C library.
 445 ifndef +link-static
 446 +link-static = $(CC) -nostdlib -nostartfiles -static -o $@ \
 447               $(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F))  \
 448               $(addprefix $(csu-objpfx),$(static-start-installed-name)) \
 449               $(+preinit) $(+prector) \
 450               $(filter-out $(addprefix $(csu-objpfx),start.o \
 451                                                      $(start-installed-name))\
 452                            $(+preinit) $(link-extra-libs-static) \
 453                            $(common-objpfx)libc% $(+postinit),$^) \
 454               $(link-extra-libs-static) $(link-libc-static) $(+postctor) $(+postinit)
 455 endif
 456 # Command for statically linking bounded-pointer programs with the C library.
 457 ifndef +link-bounded
 458 +link-bounded = $(CC) -nostdlib -nostartfiles -static -fbounded-pointers -o $@ \
 459               $(sysdep-LDFLAGS) $(LDFLAGS)  \
 460               $(addprefix $(csu-objpfx),b$(static-start-installed-name)) \
 461               $(+preinit) $(+prector) \
 462               $(filter-out $(addprefix $(csu-objpfx),start.ob \
 463                                                      $(start-installed-name))\
 464                            $(+preinit) $(link-extra-libs-bounded) \
 465                            $(common-objpfx)libc% $(+postinit),$^) \
 466               $(link-extra-libs-bounded) $(link-libc-bounded) $(+postctor) $(+postinit)
 467 endif
 468 ifndef config-LDFLAGS
 469 ifeq (yes,$(build-shared))
 470 config-LDFLAGS = -Wl,-dynamic-linker=$(slibdir)/$(rtld-installed-name)
 471 endif
 472 endif
 473 ifndef link-libc
 474 ifeq (yes,$(build-shared))
 475 # We need the versioned name of libc.so in the deps of $(others) et al
 476 # so that the symlink to libc.so is created before anything tries to
 477 # run the linked programs.
 478 link-libc = -Wl,-rpath-link=$(rpath-link) \
 479             $(common-objpfx)libc.so$(libc.so-version) \
 480             $(common-objpfx)$(patsubst %,$(libtype.oS),c) \
 481             $(as-needed) $(common-objpfx)elf/ld.so $(no-as-needed) $(gnulib)
 482 # This is how to find at build-time things that will be installed there.
 483 rpath-dirs = math elf dlfcn nss nis rt resolv crypt
 484 rpath-link = \
 485 $(common-objdir):$(subst $(empty) ,:,$(patsubst ../$(subdir),.,$(rpath-dirs:%=$(common-objpfx)%)))
 486 elfobjdir := $(patsubst ../$(subdir),.,$(common-objpfx)elf)
 487 else
 488 nssobjdir := $(patsubst ../$(subdir),.,$(common-objpfx)nss)
 489 resolvobjdir := $(patsubst ../$(subdir),.,$(common-objpfx)resolv)
 490 link-libc = $(common-objpfx)libc.a $(otherlibs) $(gnulib) $(common-objpfx)libc.a $(gnulib)
 491 endif
 492 endif
 493
 494 # Differences in the linkers on the various platforms.
 495 LDFLAGS-rpath-ORIGIN = -Wl,-rpath,'$$ORIGIN'
 496 LDFLAGS-soname-fname = -Wl,-soname,$(@F)
 497 LDFLAGS-rdynamic = -rdynamic
 498 LDFLAGS-Bsymbolic = -Bsymbolic
 499
 500 # Choose the default search path for the dynamic linker based on
 501 # where we will install libraries.
 502 ifneq ($(libdir),$(slibdir))
 503 default-rpath = $(slibdir):$(libdir)
 504 else
 505 default-rpath = $(libdir)
 506 endif
 507
 508 ifndef link-extra-libs
 509 link-extra-libs = $(LDLIBS-$(@F))
 510 link-extra-libs-static = $(link-extra-libs)
 511 link-extra-libs-bounded = $(link-extra-libs)
 512 endif
 513
 514 # The static libraries.
 515 link-libc-static = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib) -Wl,--end-group
 516 link-libc-bounded = $(common-objpfx)libc_b.a $(gnulib) $(common-objpfx)libc_b.a
 517
 518 ifndef gnulib
 519 ifneq ($(have-cc-with-libunwind),yes)
 520   libunwind =
 521 else
 522   libunwind = -lunwind
 523 endif
 524 libgcc_eh := -Wl,--as-needed -lgcc_s $(libunwind) -Wl,--no-as-needed
 525 gnulib := -lgcc $(libgcc_eh)
 526 static-gnulib := -lgcc -lgcc_eh $(libunwind)
 527 libc.so-gnulib := -lgcc
 528 endif
 529 +preinit = $(addprefix $(csu-objpfx),crti.o)
 530 +postinit = $(addprefix $(csu-objpfx),crtn.o)
 531 +prector = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbegin.o`
 532 +postctor = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtend.o`
 533 # Variants of the two previous definitions for linking PIE programs.
 534 +prectorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginS.o`
 535 +postctorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtendS.o`
 536 +interp = $(addprefix $(elf-objpfx),interp.os)
 537 csu-objpfx = $(common-objpfx)csu/
 538 elf-objpfx = $(common-objpfx)elf/
 539
 540 # How to run a program we just linked with our library.
 541 # The program binary is assumed to be $(word 2,$^).
 542 built-program-file = $(dir $(word 2,$^))$(notdir $(word 2,$^))
 543 ifeq (yes,$(build-shared))
 544 comma = ,
 545 sysdep-library-path = \
 546 $(subst $(empty) ,:,$(strip $(patsubst -Wl$(comma)-rpath-link=%, %,\
 547                                        $(filter -Wl$(comma)-rpath-link=%,\
 548                                                 $(sysdep-LDFLAGS)))))
 549 run-program-prefix = $(if $(filter $(notdir $(built-program-file)),\
 550                                    $(tests-static) $(xtests-static)),, \
 551                           $(elf-objpfx)$(rtld-installed-name) \
 552                           --library-path $(rpath-link)$(patsubst %,:%,$(sysdep-library-path)))
 553 else
 554 run-program-prefix =
 555 endif
 556 # Never use $(run-program-prefix) for the statically-linked %-bp test programs
 557 built-program-cmd = $(patsubst %,$(run-program-prefix),\
 558                         $(filter-out %-bp,$(built-program-file))) \
 559                     $(built-program-file)
 560
 561 ifndef LD
 562 LD := ld -X
 563 endif
 564
 565 # Extra flags to pass to GCC.
 566 ifeq ($(all-warnings),yes)
 567 +gccwarn := -Wall -Wwrite-strings -Winline -Wcast-qual -Wbad-function-cast -Wmissing-noreturn -Wmissing-prototypes -Wmissing-declarations -Wcomment -Wcomments -Wtrigraphs -Wsign-compare -Wfloat-equal -Wmultichar
 568 else
 569 +gccwarn := -Wall -Wwrite-strings -Winline
 570 endif
 571 +gccwarn-c = -Wstrict-prototypes
 572
 573 # We do not depend on the address of constants in different files to be
 574 # actually different, so allow the compiler to merge them all.
 575 +merge-constants = -fmerge-all-constants
 576
 577 # We have to assume that glibc functions are called in any rounding
 578 # mode and also change the rounding mode in a few functions. So,
 579 # disable any optimization that assume default rounding mode.
 580 +math-flags = -frounding-math
 581
 582 # This is the program that generates makefile dependencies from C source files.
 583 # The -MP flag tells GCC >= 3.2 (which we now require) to produce dummy
 584 # targets for headers so that removed headers don't break the build.
 585 ifndef +mkdep
 586 +mkdep = $(CC) -M -MP
 587 endif
 588
 589 # The program that makes Emacs-style TAGS files.
 590 ETAGS   := etags
 591
 592 # The `xgettext' program for producing .pot files from sources.
 593 ifndef XGETTEXT
 594 XGETTEXT = xgettext
 595 endif
 596
 597 # The `m4' macro processor; this is used by sysdeps/sparc/Makefile (and
 598 # perhaps others) to preprocess assembly code in some cases.
 599 M4 = m4
 600
 601 # To force installation of files even if they are older than the
 602 # installed files.  This variable is included in the dependency list
 603 # of all installation targets.
 604 ifeq ($(force-install),yes)
 605 +force = force-install
 606 else
 607 +force =
 608 endif
 609
 610 ####
 611 #### End of configuration variables.
 612 ####
 613 \f
 614 # This tells some versions of GNU make before 3.63 not to export all variables.
 615 .NOEXPORT:
 616
 617 # We want to echo the commands we're running without
 618 # umpteen zillion filenames along with it (we use `...' instead)
 619 # but we don't want this echoing done when the user has said
 620 # he doesn't want to see commands echoed by using -s.
 621 ifneq   "$(findstring s,$(MAKEFLAGS))" ""       # if -s
 622 +cmdecho        := echo >/dev/null
 623 else                                            # not -s
 624 +cmdecho        := echo
 625 endif                                           # -s
 626
 627 # These are the flags given to the compiler to tell
 628 # it what sort of optimization and/or debugging output to do.
 629 ifndef  +cflags
 630 # If `CFLAGS' was defined, use that.
 631 ifdef           CFLAGS
 632 +cflags := $(filter-out -I%,$(CFLAGS))
 633 endif           # CFLAGS
 634 endif   # +cflags
 635
 636 # If none of the above worked, default to "-g -O".
 637 ifeq    "$(strip $(+cflags))" ""
 638 +cflags := $(default_cflags)
 639 endif   # $(+cflags) == ""
 640
 641 +cflags += $(cflags-cpu) $(+gccwarn) $(+merge-constants) $(+math-flags)
 642 +gcc-nowarn := -w
 643
 644 # Don't duplicate options if we inherited variables from the parent.
 645 +cflags := $(sort $(+cflags))
 646
 647 # These are flags given to the C compiler to tell it to look for
 648 # include files (including ones given in angle brackets) in the parent
 649 # library source directory, in the include directory, and in the
 650 # current directory.
 651 +sysdep-includes = $(addprefix -I,$(+sysdep_dirs))
 652 +includes = -I$(..)include $(if $(subdir),$(objpfx:%/=-I%)) \
 653             $(+sysdep-includes) $(includes) \
 654             $(patsubst %/,-I%,$(..)) $(libio-include) -I. $(sysincludes)
 655
 656 # Since libio has several internal header files, we use a -I instead
 657 # of many little headers in the include directory.
 658 libio-include = -I$(..)libio
 659
 660 # These are the variables that the implicit compilation rules use.
 661 # Note that we can't use -std=* in CPPFLAGS, because it overrides
 662 # the implicit -lang-asm and breaks cpp behavior for .S files--notably
 663 # it causes cpp to stop predefining __ASSEMBLER__.
 664 CPPFLAGS = $(CPPUNDEFS) $(CPPFLAGS-config) $($(subdir)-CPPFLAGS) \
 665            $(+includes) $(defines) \
 666            -include $(..)include/libc-symbols.h $(sysdep-CPPFLAGS) \
 667            $(CPPFLAGS-$(suffix $@)) \
 668            $(foreach lib,$(libof-$(basename $(@F))) \
 669                          $(libof-$(<F)) $(libof-$(@F)),$(CPPFLAGS-$(lib))) \
 670            $(CPPFLAGS-$(<F)) $(CPPFLAGS-$(@F)) $(CPPFLAGS-$(basename $(@F)))
 671 override CFLAGS = -std=gnu99 $(gnu89-inline-CFLAGS) $(config-extra-cflags) \
 672                   $(filter-out %frame-pointer,$(+cflags)) $(+gccwarn-c) \
 673                   $(sysdep-CFLAGS) $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) \
 674                   $(CFLAGS-$(@F)) \
 675                   $(foreach lib,$(libof-$(basename $(@F))) \
 676                                 $(libof-$(<F)) $(libof-$(@F)),$(CFLAGS-$(lib)))
 677 override CXXFLAGS = $(c++-sysincludes) \
 678                     $(filter-out %frame-pointer,$(+cflags)) $(sysdep-CFLAGS) \
 679                     $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) $(CFLAGS-$(@F))
 680
 681 # If everything is compiled with -fPIC (implicitly) we must tell this by
 682 # defining the PIC symbol.
 683 ifeq (yes,$(build-pic-default))
 684 pic-default = -DPIC
 685 endif
 686
 687 # Enable object files for different versions of the library.
 688 # Various things use $(object-suffixes) to know what all to make.
 689 # The compilation rules use $(CPPFLAGS-${SUFFIX}) and $(CFLAGS-${SUFFIX})
 690 # to pass different flags for each flavor.
 691 libtypes = $(foreach o,$(object-suffixes-for-libc),$(libtype$o))
 692 all-object-suffixes := .o .os .op .og .ob .oS
 693 object-suffixes :=
 694 CPPFLAGS-.o = $(pic-default)
 695 CFLAGS-.o = $(filter %frame-pointer,$(+cflags))
 696 libtype.o := lib%.a
 697 object-suffixes += .o
 698 ifeq (yes,$(build-shared))
 699 # Under --enable-shared, we will build a shared library of PIC objects.
 700 # The PIC object files are named foo.os.
 701 object-suffixes += .os
 702 CPPFLAGS-.os = -DPIC -DSHARED
 703 CFLAGS-.os = $(filter %frame-pointer,$(+cflags)) $(pic-ccflag)
 704 libtype.os := lib%_pic.a
 705 # This can be changed by a sysdep makefile
 706 pic-ccflag = -fPIC
 707 # This one should always stay like this unless there is a very good reason.
 708 PIC-ccflag = -fPIC
 709 endif
 710 # This can be changed by a sysdep makefile
 711 pie-ccflag = -fpie
 712 # This one should always stay like this unless there is a very good reason.
 713 PIE-ccflag = -fPIE
 714 ifeq (yes,$(build-profile))
 715 # Under --enable-profile, we will build a static library of profiled objects.
 716 # The profiled object files are named foo.op.
 717 object-suffixes += .op
 718 CPPFLAGS-.op = -DPROF $(pic-default)
 719 CFLAGS-.op = -pg
 720 libtype.op = lib%_p.a
 721 endif
 722
 723 # Convenience variable for when we want to treat shared-library cases
 724 # differently from the rest.
 725 object-suffixes-noshared := $(filter-out .os,$(object-suffixes))
 726
 727 bppfx = BP-
 728 ifeq (yes,$(build-bounded))
 729 # Under --enable-bounded, we build the library with `-fbounded-pointers -g'
 730 # to runtime bounds checking.  The bounded-pointer objects are named foo.ob.
 731 # We disable sibling-call optimizations so that stack traces will be complete
 732 # and thus aid debugging, since after all, BPs are a debugging tool.
 733 object-suffixes += .ob
 734 CPPFLAGS-.ob = -fbounded-pointers $(pic-default)
 735 CFLAGS-.ob = -g -O2 -fno-optimize-sibling-calls -fno-strict-aliasing
 736 libtype.ob = lib%_b.a
 737 endif
 738
 739 object-suffixes-for-libc := $(object-suffixes)
 740
 741 ifeq (yes,$(build-shared))
 742 # Build special library that contains the static-only routines for libc.
 743 object-suffixes-for-libc += .oS
 744
 745 # Must build the routines as PIC, though, because they can end up in (users')
 746 # shared objects.  We don't want to use CFLAGS-os because users may, for
 747 # example, make that processor-specific.
 748 CFLAGS-.oS = $(CFLAGS-.o) $(PIC-ccflag)
 749 CPPFLAGS-.oS = $(CPPFLAGS-.o) -DPIC -DLIBC_NONSHARED=1
 750 libtype.oS = lib%_nonshared.a
 751 endif
 752
 753 # The assembler can generate debug information too.
 754 ifndef ASFLAGS
 755 ifeq ($(have-cpp-asm-debuginfo),yes)
 756 ASFLAGS := $(filter -g% -fdebug-prefix-map=%,$(CFLAGS))
 757 else
 758 ASFLAGS :=
 759 endif
 760 endif
 761 ASFLAGS += $(ASFLAGS-config) $(asflags-cpu)
 762
 763 ifndef BUILD_CC
 764 BUILD_CC = $(CC)
 765 endif
 766
 767 move-if-change = $(SHELL) $(..)scripts/move-if-change
 768 \f
 769 -include $(common-objpfx)sysd-sorted
 770 subdirs = $(sorted-subdirs)
 771 subdir-srcdirs = $(foreach dir,$(subdirs),\
 772                            $(firstword $($(dir)-srcdir) $(..)$(dir)))
 773
 774 ifeq (yes, $(build-shared))
 775
 776 # This is a pair of implicit rules to preprocess a file with # comments,
 777 # %ifdef et al, based on config.h settings or other %include'd files.
 778 # We use chained rules instead of a pipeline here so that we can properly
 779 # check the exit status of cpp rather than using its bad output when there
 780 # is a preprocessing error.  Another rule should depend on the output file
 781 # `FOO.v', and along with that `FOO.v.i' should be given dependencies
 782 # listing both its input files, and any header files that it may reference
 783 # (but no commands).
 784 %.v.i: $(common-objpfx)config.h $(..)Makeconfig
 785         sed '/^[        ]*%/!s/#.*$$//;/^[      ]*$$/d;s/^[     ]*%/#/' \
 786             $(filter-out FORCE %.h $(..)Makeconfig,$^) \
 787         | $(CC) -E -undef $(CPPFLAGS) -x assembler-with-cpp - \
 788                    > $@T
 789         mv -f $@T $@
 790 %.v: %.v.i
 791         sed '/^[        ]*#/d;/^[       ]*$$/d' $< > $@T
 792         mv -f $@T $@
 793
 794 # To generate a header to support more than one ABI for different
 795 # architecture variants, the CPU/Makefile defines abi-variants to be a
 796 # list of names for those variants (e.g. 32 64), and, for each variant,
 797 # defines abi-$(variant)-condition to be the condition for those options
 798 # to use in a C #if condition.  abi-includes may be defined to a list of
 799 # headers to include in the generated header, if the default does not
 800 # suffice.  default-abi is defined to be the ABI for the current glibc
 801 # build.
 802
 803 ifndef abi-includes
 804 abi-includes := bits/wordsize.h
 805 endif
 806
 807 # Process the shlib-versions file, which tells us what shared library
 808 # version numbers to use when we install shared objects on this system.
 809 # We need to wait until $(subdirs) is complete.
 810 ifeq ($(sysd-sorted-done),t)
 811 -include $(common-objpfx)soversions.mk
 812 ifndef avoid-generated
 813 # This lets add-ons give more-specific matches that override defaults
 814 # in the top-level file.
 815 $(common-objpfx)shlib-versions.v.i: \
 816         $(wildcard $(+sysdep_dirs:=/shlib-versions) \
 817                    $(subdir-srcdirs:=/shlib-versions)) \
 818         $(..)shlib-versions
 819
 820 soversions-default-setname = $(patsubst %, %,\
 821                                         $(filter-out %_default,\
 822                                                      $(oldest-abi:%=GLIBC_%)))
 823 $(common-objpfx)soversions.i: $(..)scripts/soversions.awk \
 824                               $(common-objpfx)shlib-versions.v
 825         $(AWK) -v default_setname='$(soversions-default-setname)' \
 826                -v cpu='$(config-machine)' \
 827                -v vendor='$(config-vendor)' \
 828                -v os='$(config-os)' \
 829                -f $^ > $@T
 830         mv -f $@T $@
 831 $(common-objpfx)soversions.mk: $(common-objpfx)soversions.i $(..)Makeconfig
 832         (while read which lib number setname; do \
 833            eval seen_$$which=1; \
 834            test x"$$which" != xABI || echo abi-name = "$$lib"; \
 835            test x"$$which" = xDEFAULT || continue; \
 836            case $$number in \
 837              [0-9]*) echo "$$lib.so-version=.$$number"; \
 838                      echo "all-sonames+=$$lib=$$lib.so\$$($$lib.so-version)";;\
 839              *)      echo "$$lib.so-version=\$$(if \$$(abi-$(default-abi)-$$lib-soname),\$$(abi-$(default-abi)-$$lib-soname),$$number)"; \
 840                      echo "all-sonames+=$$lib=\$$($$lib.so-version)";;\
 841            esac; \
 842          done; \
 843          echo soversions.mk-done = t;) < $< > $@T; exit 0
 844         mv -f $@T $@
 845 endif
 846 endif
 847
 848 postclean-generated += soversions.mk soversions.i \
 849                        shlib-versions.v shlib-versions.v.i
 850
 851 # Generate the header containing the names of all shared libraries.
 852 # We use a stamp file to avoid unnecessary recompilations.
 853 before-compile += $(common-objpfx)gnu/lib-names.h
 854 ifeq ($(soversions.mk-done),t)
 855 $(common-objpfx)gnu/lib-names.h: $(common-objpfx)gnu/lib-names.stmp; @:
 856 $(common-objpfx)gnu/lib-names.stmp: $(..)scripts/lib-names.awk \
 857                                     $(common-objpfx)soversions.i
 858         $(make-target-directory)
 859         { \
 860          echo '/* This file is automatically generated.';\
 861          echo '   It defines macros to allow user program to find the shared'; \
 862          echo '   library files which come as part of GNU libc.  */'; \
 863          echo '#ifndef __GNU_LIB_NAMES_H'; \
 864          echo '#define __GNU_LIB_NAMES_H        1'; \
 865          echo ''; \
 866          $(if $(abi-includes), \
 867           $(foreach h,$(abi-includes), echo '#include <$(h)>';) \
 868           echo '';) \
 869          $(if $(abi-variants), \
 870          $(foreach v,$(abi-variants),\
 871          $(if $(abi-$(v)-condition),\
 872          echo '#if $(abi-$(v)-condition)'; \
 873          ($(foreach s,$(all-sonames), \
 874            $(if $(abi-$(v)-$(firstword $(subst =, ,$(s)))-soname),\
 875              echo $(firstword $(subst =, ,$(s)))=$(abi-$(v)-$(firstword $(subst =, ,$(s)))-soname);, \
 876              echo $(s);))) \
 877          | LC_ALL=C $(AWK) -v multi=1 -f $(firstword $^) | LC_ALL=C sort;) \
 878          $(if $(abi-$(v)-condition),echo '#endif';)), \
 879          ($(foreach s,$(all-sonames), echo $(s);)) \
 880          | LC_ALL=C $(AWK) -f $(firstword $^) | LC_ALL=C sort;) \
 881          echo ''; \
 882          echo '#endif   /* gnu/lib-names.h */'; \
 883         } >  ${@:stmp=T}
 884         $(move-if-change) ${@:stmp=T} ${@:stmp=h}
 885         touch $@
 886 endif
 887
 888 common-generated += gnu/lib-names.h gnu/lib-names.stmp
 889
 890 # The name under which the run-time dynamic linker is installed.
 891 # We are currently going for the convention that `/lib/ld.so.1'
 892 # names the SVR4/ELF ABI-compliant dynamic linker.
 893 ifndef rtld-installed-name
 894 ifdef ld.so-version
 895 rtld-installed-name = $(ld.so-version)
 896 else
 897 rtld-installed-name = ld.so.1
 898 endif
 899 endif
 900
 901 ifndef rtld-version-installed-name
 902 rtld-version-installed-name = ld-$(version).so
 903 endif
 904
 905 endif # build-shared
 906
 907
 908 dlfcn = dlfcn
 909 ifeq ($(build-shared),yes)
 910 libdl = $(common-objpfx)dlfcn/libdl.so$(libdl.so-version)
 911 else
 912 libdl = $(common-objpfx)dlfcn/libdl.a
 913 endif
 914
 915 ifeq ($(build-shared),yes)
 916 libm = $(common-objpfx)math/libm.so$(libm.so-version)
 917 else
 918 libm = $(common-objpfx)math/libm.a
 919 endif
 920
 921 # These are the subdirectories containing the library source.  The order
 922 # is more or less arbitrary.  The sorting step will take care of the
 923 # dependencies.
 924 all-subdirs = csu assert ctype locale intl catgets math setjmp signal       \
 925               stdlib stdio-common libio malloc string wcsmbs time dirent    \
 926               grp pwd posix io termios resource misc socket sysvipc gmon    \
 927               gnulib iconv iconvdata wctype manual shadow gshadow po argp   \
 928               crypt nss localedata timezone rt conform debug                \
 929               $(add-on-subdirs) $(dlfcn) $(binfmt-subdir)
 930
 931 ifndef avoid-generated
 932 all-Depend-files := $(wildcard $(foreach dir,$(all-subdirs),\
 933                                          $(firstword $($(dir)-srcdir) \
 934                                                      $(..)$(dir))/Depend))
 935 $(common-objpfx)sysd-sorted: $(..)scripts/gen-sorted.awk \
 936                              $(common-objpfx)config.make $(..)Makeconfig \
 937                              $(wildcard $(sysdirs:=/Subdirs)) \
 938                              $(all-Depend-files)
 939         $(AWK) -f $< \
 940                -v subdirs='$(all-subdirs)' \
 941                -v srcpfx='$(..)' \
 942                $(filter %/Subdirs %/Depend,$^) > $@-tmp
 943         mv -f $@-tmp $@
 944 $(all-Depend-files): ;
 945 endif
 946
 947 # This gives partial TARGET:SOURCE pattern pairs to have rules
 948 # emitted into sysd-rules.  A sysdeps Makeconfig fragment can
 949 # add its own special object file prefix to this list with e.g. foo-%:%
 950 # to have foo-*.? compiled from *.? using $(foo-CPPFLAGS).
 951 sysd-rules-patterns := %:% rtld-%:rtld-% rtld-%:% m_%:s_%
 952
 953 # Let sysdeps/ subdirs contain a Makeconfig fragment for us to include here.
 954 sysdep-makeconfigs := $(wildcard $(+sysdep_dirs:=/Makeconfig))
 955 ifneq (,$(sysdep-makeconfigs))
 956 include $(sysdep-makeconfigs)
 957 endif
 958
 959 # Compute just the target patterns.  Makeconfig has set sysd-rules-patterns.
 960 sysd-rules-targets := $(sort $(foreach p,$(sysd-rules-patterns),\
 961                                          $(firstword $(subst :, ,$p))))
 962
 963 endif # Makeconfig not yet included
 964
 965 # Local Variables:
 966 # mode: makefile
 967 # End: