gold/configure.ac

   1 dnl Process this file with autoconf to produce a configure script.
   2 dnl
   3 dnl   Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
   4 dnl   Free Software Foundation, Inc.
   5 dnl
   6 dnl This file is free software; you can redistribute it and/or modify
   7 dnl it under the terms of the GNU General Public License as published by
   8 dnl the Free Software Foundation; either version 3 of the License, or
   9 dnl (at your option) any later version.
  10 dnl
  11 dnl This program is distributed in the hope that it will be useful,
  12 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 dnl GNU General Public License for more details.
  15 dnl
  16 dnl You should have received a copy of the GNU General Public License
  17 dnl along with this program; see the file COPYING3.  If not see
  18 dnl <http://www.gnu.org/licenses/>.
  19 dnl
  20
  21 AC_PREREQ(2.59)
  22
  23 AC_INIT(gold, 0.1)
  24 AC_CONFIG_SRCDIR(gold.cc)
  25
  26 AC_CANONICAL_TARGET
  27
  28 AM_INIT_AUTOMAKE([no-dist parallel-tests])
  29
  30 AM_CONFIG_HEADER(config.h:config.in)
  31
  32 # PR 14072
  33 AH_VERBATIM([00_CONFIG_H_CHECK],
  34 [/* Check that config.h is #included before system headers
  35    (this works only for glibc, but that should be enough).  */
  36 #if defined(__GLIBC__) && !defined(__FreeBSD_kernel__) && !defined(__CONFIG_H__)
  37 #  error config.h must be #included before system headers
  38 #endif
  39 #define __CONFIG_H__ 1])
  40
  41 AC_ARG_WITH(sysroot,
  42 [  --with-sysroot[=DIR]    search for usr/lib et al within DIR],
  43 [sysroot=$withval], [sysroot=no])
  44
  45 if test "$sysroot" = "yes"; then
  46   sysroot='${exec_prefix}/${target_alias}/sys-root'
  47 elif test "$sysroot" = "no"; then
  48   sysroot=
  49 fi
  50
  51 sysroot_relocatable=0
  52 if test -n "$sysroot"; then
  53   case "sysroot" in
  54     "${prefix}" | "${prefix}/"* | \
  55     "${exec_prefix}" | "${exec_prefix}/"* | \
  56     '${prefix}' | '${prefix}/'*| \
  57     '${exec_prefix}' | '${exec_prefix}/'*)
  58       sysroot_relocatable=1
  59       ;;
  60   esac
  61 fi
  62
  63 AC_DEFINE_UNQUOTED(TARGET_SYSTEM_ROOT, "$sysroot",
  64   [System root for target files])
  65 AC_DEFINE_UNQUOTED(TARGET_SYSTEM_ROOT_RELOCATABLE, $sysroot_relocatable,
  66   [Whether the system root can be relocated])
  67
  68 dnl "install_as_default" is true if the linker to be installed as the
  69 dnl default linker, ld.
  70 dnl "installed_linker" is the installed gold linker name.
  71
  72 installed_linker=ld.gold
  73 AC_ARG_ENABLE(gold,
  74 [[  --enable-gold[=ARG]     build gold [ARG={default,yes,no}]]],
  75 [case "${enableval}" in
  76  default)
  77    install_as_default=yes
  78    ;;
  79  yes)
  80    if test x${enable_ld} = xno; then
  81      install_as_default=yes
  82    fi
  83    ;;
  84  esac],
  85 [install_as_default=no])
  86 AC_SUBST(install_as_default)
  87 AC_SUBST(installed_linker)
  88
  89 dnl For now threads are a configure time option.
  90 AC_ARG_ENABLE([threads],
  91 [  --enable-threads        multi-threaded linking],
  92 [case "${enableval}" in
  93   yes | "") threads=yes ;;
  94   no) threads=no ;;
  95   *) threads=yes ;;
  96  esac],
  97 [threads=no])
  98 if test "$threads" = "yes"; then
  99   AC_DEFINE(ENABLE_THREADS, 1,
 100             [Define to do multi-threaded linking])
 101 fi
 102 AM_CONDITIONAL(THREADS, test "$threads" = "yes")
 103
 104 AC_ARG_ENABLE([plugins],
 105 [  --enable-plugins        linker plugins],
 106 [case "${enableval}" in
 107   yes | "") plugins=yes ;;
 108   no) plugins=no ;;
 109   *) plugins=yes ;;
 110  esac],
 111 [plugins=no])
 112 if test "$plugins" = "yes"; then
 113   AC_DEFINE(ENABLE_PLUGINS, 1,
 114             [Define to enable linker plugins])
 115 fi
 116 AM_CONDITIONAL(PLUGINS, test "$plugins" = "yes")
 117
 118 AC_ARG_ENABLE([targets],
 119 [  --enable-targets        alternative target configurations],
 120 [case "${enableval}" in
 121   yes | "")
 122     AC_MSG_ERROR([--enable-targets option must specify target names or 'all'])
 123     ;;
 124   no)
 125     enable_targets=
 126     ;;
 127   *)
 128     enable_targets=$enableval
 129     ;;
 130 esac],
 131 [# For now, enable all targets by default
 132  enable_targets=all
 133 ])
 134
 135 # Canonicalize the enabled targets.
 136 if test -n "$enable_targets"; then
 137   for targ in `echo $enable_targets | sed -e 's/,/ /g'`; do
 138     result=`$ac_config_sub $targ 2>/dev/null`
 139     if test -n "$result"; then
 140       canon_targets="$canon_targets $result"
 141     else
 142       # Permit unrecognized target names, like "all".
 143       canon_targets="$canon_targets $targ"
 144     fi
 145   done
 146 fi
 147
 148 # See which specific instantiations we need.
 149 targetobjs=
 150 all_targets=
 151 default_machine=
 152 default_size=
 153 default_big_endian=
 154 default_osabi=ELFOSABI_NONE
 155 targ_32_little=
 156 targ_32_big=
 157 targ_64_little=
 158 targ_64_big=
 159 for targ in $target $canon_targets; do
 160   if test "$targ" = "all"; then
 161     targ_32_little=yes
 162     targ_32_big=yes
 163     targ_64_little=yes
 164     targ_64_big=yes
 165     all_targets=yes
 166   else
 167     . ${srcdir}/configure.tgt
 168
 169     if test "$targ_obj" = "UNKNOWN"; then
 170       AC_MSG_ERROR("unsupported target $targ")
 171     else
 172       targetobjs="$targetobjs ${targ_obj}.\$(OBJEXT)"
 173       if test "$targ_extra_obj" != ""; then
 174         targetobjs="$targetobjs ${targ_extra_obj}.\$(OBJEXT)"
 175       fi
 176       if test "$targ_size" = "32" -o "$targ_extra_size" = "32"; then
 177           if test "$targ_big_endian" = "true" \
 178               -o "$targ_extra_big_endian" = "true"; then
 179               targ_32_big=yes
 180           fi
 181           if test "$targ_big_endian" = "false" \
 182               -o "$targ_extra_big_endian" = "false"; then
 183               targ_32_little=yes
 184           fi
 185       fi
 186       if test "$targ_size" = "64" -o "$targ_extra_size" = "64"; then
 187           if test "$targ_big_endian" = "true" \
 188               -o "$targ_extra_big_endian" = "true"; then
 189               targ_64_big=yes
 190           fi
 191           if test "$targ_big_endian" = "false" \
 192               -o "$targ_extra_big_endian" = "false"; then
 193               targ_64_little=yes
 194           fi
 195       fi
 196
 197       if test "$target" = "$targ"; then
 198         default_machine=$targ_machine
 199         default_size=$targ_size
 200         default_big_endian=$targ_big_endian
 201         default_osabi=$targ_osabi
 202
 203         AM_CONDITIONAL(DEFAULT_TARGET_ARM, test "$targ_obj" = "arm")
 204         AM_CONDITIONAL(DEFAULT_TARGET_I386, test "$targ_obj" = "i386")
 205         AM_CONDITIONAL(DEFAULT_TARGET_POWERPC, test "$targ_obj" = "powerpc")
 206         AM_CONDITIONAL(DEFAULT_TARGET_SPARC, test "$targ_obj" = "sparc")
 207         AM_CONDITIONAL(DEFAULT_TARGET_X86_64, test "$targ_obj" = "x86_64")
 208         AM_CONDITIONAL(DEFAULT_TARGET_TILEGX, test "$targ_obj" = "tilegx")
 209         DEFAULT_TARGET=${targ_obj}
 210         AC_SUBST(DEFAULT_TARGET)
 211       fi
 212     fi
 213   fi
 214 done
 215
 216 # Remove any duplicates.
 217 to=""
 218 for t in $targetobjs; do
 219   case " $to " in
 220   *" $t "*) ;;
 221   *) to="$to $t" ;;
 222   esac
 223 done
 224 targetobjs=$to
 225
 226 if test -n "$targ_32_little"; then
 227   AC_DEFINE(HAVE_TARGET_32_LITTLE, 1,
 228               [Define to support 32-bit little-endian targets])
 229 fi
 230 if test -n "$targ_32_big"; then
 231   AC_DEFINE(HAVE_TARGET_32_BIG, 1,
 232               [Define to support 32-bit big-endian targets])
 233 fi
 234 if test -n "$targ_64_little"; then
 235   AC_DEFINE(HAVE_TARGET_64_LITTLE, 1,
 236               [Define to support 64-bit little-endian targets])
 237 fi
 238 if test -n "$targ_64_big"; then
 239   AC_DEFINE(HAVE_TARGET_64_BIG, 1,
 240               [Define to support 64-bit big-endian targets])
 241 fi
 242
 243 if test -n "$all_targets"; then
 244   TARGETOBJS='$(ALL_TARGETOBJS)'
 245 else
 246   TARGETOBJS="$targetobjs"
 247 fi
 248 AC_SUBST(TARGETOBJS)
 249
 250 AC_DEFINE_UNQUOTED(GOLD_DEFAULT_MACHINE, $default_machine,
 251                    [Default machine code])
 252 AC_DEFINE_UNQUOTED(GOLD_DEFAULT_SIZE, $default_size,
 253                    [Default size (32 or 64)])
 254 AC_DEFINE_UNQUOTED(GOLD_DEFAULT_BIG_ENDIAN, $default_big_endian,
 255                    [Default big endian (true or false)])
 256 AC_DEFINE_UNQUOTED(GOLD_DEFAULT_OSABI, $default_osabi,
 257                    [Default OSABI code])
 258
 259 AC_ARG_WITH(lib-path,
 260 [  --with-lib-path=dir1:dir2...  set default LIB_PATH],
 261 [case "$withval" in
 262  yes) LIB_PATH='"/lib:/usr/lib"' ;;
 263  no) LIB_PATH='""' ;;
 264  *) LIB_PATH='"'"$withval"'"' ;;
 265  esac],
 266 [LIB_PATH='"::DEFAULT::"'])
 267 AC_DEFINE_UNQUOTED(LIB_PATH, $LIB_PATH,
 268                    [Default library search path])
 269 if test "x$target_alias" = "x" -o "x$host_alias" = "x$target_alias"; then
 270   AC_DEFINE(NATIVE_LINKER, 1, [Whether configured as a native linker])
 271 fi
 272
 273 AC_CHECK_TOOL(NM, nm)
 274
 275 AC_PROG_CC
 276 AC_PROG_CXX
 277 AC_PROG_YACC
 278 AC_PROG_RANLIB
 279 AC_PROG_INSTALL
 280 AC_PROG_LN_S
 281
 282 AC_GNU_SOURCE
 283
 284 ZW_GNU_GETTEXT_SISTER_DIR
 285 AM_PO_SUBDIRS
 286
 287 AC_C_BIGENDIAN
 288
 289 AC_EXEEXT
 290
 291 AM_CONDITIONAL(NATIVE_LINKER,
 292   test "x$target_alias" = "x" -o "x$host_alias" = "x$target_alias")
 293 AM_CONDITIONAL(GCC, test "$GCC" = yes)
 294
 295 AM_CONDITIONAL(NATIVE_OR_CROSS_LINKER,
 296   test "x$target_alias" = "x" -o "x$host_alias" = "x$target_alias" -o "x$host_alias" = "x$build_alias")
 297
 298 dnl Test for whether static linking is supported.  Some systems do not
 299 dnl install static libraries.  This only affects the set of tests that
 300 dnl we run.
 301 AC_CACHE_CHECK([whether static linking works], [gold_cv_lib_static],
 302 [LDFLAGS_hold=$LDFLAGS
 303 LDFLAGS="$LDFLAGS -static"
 304 AC_LINK_IFELSE([
 305 AC_LANG_PROGRAM([[void f() { }]])],
 306 [gold_cv_lib_static=yes], [gold_cv_lib_static=no])
 307 LDFLAGS=$LDFLAGS_hold])
 308 AM_CONDITIONAL(HAVE_STATIC, test "$gold_cv_lib_static" = "yes")
 309
 310 dnl Some architectures do not support taking pointers of functions
 311 dnl defined in shared libraries except in -fPIC mode.  We need to
 312 dnl tell the unittest framework if we're compiling for one of those
 313 dnl targets, so it doesn't try to run the tests that do that.
 314 AM_CONDITIONAL(FN_PTRS_IN_SO_WITHOUT_PIC, [
 315   case $target_cpu in
 316     powerpc*) false;;
 317     x86_64) false;;
 318     sparc64) false;;
 319     *) true;;
 320   esac])
 321
 322 dnl Test for gcc 4.1 or later.  Full support for -mcmodel=medium is
 323 dnl only available in gcc 4.1.
 324 AC_CACHE_CHECK([for gcc >= 4.1], [gold_cv_prog_gcc41],
 325 [AC_COMPILE_IFELSE([
 326 #if !defined __GNUC__
 327 error
 328 #elif __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 1)
 329 error
 330 #endif
 331 ], [gold_cv_prog_gcc41=yes], [gold_cv_prog_gcc41=no])])
 332
 333 save_CFLAGS="$CFLAGS"
 334 CFLAGS="$CFLAGS -mcmodel=medium"
 335 AC_COMPILE_IFELSE([int i;], [have_mcmodel_medium=yes], [have_mcmodel_medium=no])
 336 CFLAGS="$save_CFLAGS"
 337 dnl Whether we can test -mcmodel=medium.
 338 AM_CONDITIONAL(MCMODEL_MEDIUM,
 339 [test "$target_cpu" = "x86_64" -a "$have_mcmodel_medium" = "yes" -a "$gold_cv_prog_gcc41" = "yes"])
 340
 341 AC_CACHE_CHECK([whether $CC supports -fmerge-constants],
 342                [gold_cv_merge_constants], [
 343 save_CFLAGS="$CFLAGS"
 344 CFLAGS="$CFLAGS -fmerge-constants"
 345 AC_COMPILE_IFELSE([const char *s = "foo";],
 346                   [have_merge_constants=yes],
 347                   [have_merge_constants=no])
 348 CFLAGS="$save_CFLAGS"])
 349 AC_SUBST([MERGE_CONSTANTS_FLAG])
 350 AS_IF([test "$gold_cv_merge_constants" = yes],
 351       [MERGE_CONSTANTS_FLAG=-fmerge-constants],
 352       [MERGE_CONSTANTS_FLAG=])
 353
 354 dnl Test for __thread support.
 355 AC_CACHE_CHECK([for thread support], [gold_cv_c_thread],
 356 [AC_COMPILE_IFELSE([__thread int i = 1;],
 357 [gold_cv_c_thread=yes], [gold_cv_c_thread=no])])
 358
 359 AM_CONDITIONAL(TLS, test "$gold_cv_c_thread" = "yes")
 360
 361 dnl On GNU/Linux TLS in static programs only works when using glibc
 362 dnl 2.4 or later.
 363 AC_CACHE_CHECK([for glibc >= 2.4], [gold_cv_lib_glibc24],
 364 [AC_COMPILE_IFELSE([
 365 #include <features.h>
 366 #if !defined __GLIBC__
 367 error
 368 #elif __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 4)
 369 error
 370 #endif
 371 ], [gold_cv_lib_glibc24=yes], [gold_cv_lib_glibc24=no])])
 372
 373 AM_CONDITIONAL(STATIC_TLS, test "$gold_cv_lib_glibc24" = "yes")
 374
 375 dnl Test for #pragma omp threadprivate
 376 AC_CACHE_CHECK([for omp support], [gold_cv_c_threadprivate],
 377 [save_CFLAGS="$CFLAGS"
 378 CFLAGS="$CFLAGS -fopenmp"
 379 AC_COMPILE_IFELSE([
 380 #include <omp.h>
 381 int i;
 382 #pragma omp threadprivate (i)
 383 ], [gold_cv_c_threadprivate=yes], [gold_cv_c_threadprivate=no])
 384 CFLAGS="$save_CFLAGS"])
 385 if test "$gold_cv_c_threadprivate" = "yes"; then
 386   AC_DEFINE(HAVE_OMP_SUPPORT, 1,
 387             [Define if compiler supports #pragma omp threadprivate])
 388 fi
 389 AM_CONDITIONAL(OMP_SUPPORT, test "$gold_cv_c_threadprivate" = "yes")
 390
 391 dnl Test for the -ftls-dialect=gnu2 option.
 392 dnl Use -Werror in case of compilers that make unknown -m options warnings.
 393 dnl They would pass the test here, but fail in actual use when $WARN_CFLAGS
 394 dnl gets set later by default Autoconf magic to include -Werror.  (We are
 395 dnl assuming here that there is no compiler that groks -mtls-dialect=gnu2
 396 dnl but does not grok -Werror.)
 397 save_CFLAGS="$CFLAGS"
 398 CFLAGS="$CFLAGS -Werror -fpic -mtls-dialect=gnu2"
 399 AC_COMPILE_IFELSE([
 400 __thread int i;
 401 void foo (void)
 402 {
 403   i = 10;
 404 }
 405 ], [have_tls_gnu2=yes], [have_tls_gnu2=no])
 406 CFLAGS="$save_CFLAGS"
 407 AM_CONDITIONAL(TLS_GNU2_DIALECT, test "$have_tls_gnu2" = "yes")
 408
 409 dnl On GNU/Linux TLS descriptors are supported by the dynamic loader
 410 dnl only with glibc 2.9 or later.
 411 AC_CACHE_CHECK([for glibc >= 2.9], [gold_cv_lib_glibc29],
 412 [AC_COMPILE_IFELSE([
 413 #include <features.h>
 414 #if !defined __GLIBC__
 415 error
 416 #elif __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 9)
 417 error
 418 #endif
 419 ], [gold_cv_lib_glibc29=yes], [gold_cv_lib_glibc29=no])])
 420
 421 AM_CONDITIONAL(TLS_DESCRIPTORS, test "$gold_cv_lib_glibc29" = "yes")
 422
 423 dnl Test for the -frandom-seed option.
 424 AC_CACHE_CHECK([for -frandom-seed support], [gold_cv_c_random_seed],
 425 [save_CFLAGS="$CFLAGS"
 426 CFLAGS="$CFLAGS -frandom-seed=foo"
 427 AC_COMPILE_IFELSE([int i;], [gold_cv_c_random_seed=yes],
 428 [gold_cv_c_random_seed=no])
 429 CFLAGS="$save_CFLAGS"])
 430 if test "$gold_cv_c_random_seed" = "yes"; then
 431   # In Makefile, '$@' will be expanded to be the name of the file
 432   # being built, providing a unique seed for each file.
 433   RANDOM_SEED_CFLAGS=-frandom-seed=\$@
 434 fi
 435 AC_SUBST(RANDOM_SEED_CFLAGS)
 436
 437 dnl On GNU/Linux ifunc is supported by the dynamic linker in glibc
 438 dnl 2.11 or later, and by binutils 2.20.1 or later.
 439 AC_CACHE_CHECK([for glibc ifunc support], [gold_cv_lib_glibc_ifunc],
 440 [save_LDFLAGS="$LDFLAGS"
 441 LDFLAGS="$LDFLAGS -static"
 442 AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 443 #include <features.h>
 444 #if !defined __GLIBC__
 445 error
 446 #elif __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 11)
 447 error
 448 #endif
 449 void func (void) { }
 450 void invoke (void);
 451 __asm__(".type invoke, %gnu_indirect_function");
 452 typedef void (*funcptr) (void);
 453 funcptr dispatch (void) __asm__ ("invoke");
 454 funcptr dispatch (void) { return &func; }]],
 455 [[invoke();]])
 456 ], [
 457 if ${NM} conftest$EXEEXT | grep "__rela\?_iplt_start" >/dev/null 2>&1; then
 458   gold_cv_lib_glibc_ifunc=both
 459 else
 460   gold_cv_lib_glibc_ifunc=dyn
 461 fi], [gold_cv_lib_glibc_ifunc=no])
 462 LDFLAGS="$save_LDFLAGS"])
 463
 464 AM_CONDITIONAL(IFUNC, test "$gold_cv_lib_glibc_ifunc" != "no")
 465 AM_CONDITIONAL(IFUNC_STATIC, test "$gold_cv_lib_glibc_ifunc" = "both")
 466
 467 AM_BINUTILS_WARNINGS
 468
 469 WARN_CXXFLAGS=`echo ${WARN_CFLAGS} | sed -e 's/-Wstrict-prototypes//' -e 's/-Wmissing-prototypes//' -e 's/-Wshadow//'`
 470 AC_SUBST(WARN_CXXFLAGS)
 471
 472 AC_ARG_WITH(gold-ldflags,
 473 [  --with-gold-ldflags=FLAGS  additional link flags for gold],
 474 [if test "$withval" = "no" -o "$withval" = "yes"; then
 475    GOLD_LDFLAGS=
 476  else
 477    GOLD_LDFLAGS=$withval
 478  fi],
 479 [GOLD_LDFLAGS=])
 480 AC_SUBST(GOLD_LDFLAGS)
 481
 482 AC_ARG_WITH(gold-ldadd,
 483 [  --with-gold-ldadd=LIBS     additional libraries for gold],
 484 [if test "$withval" = "no" -o "$withval" = "yes"; then
 485    GOLD_LDADD=
 486  else
 487    GOLD_LDADD=$withval
 488  fi],
 489 [GOLD_LDADD=])
 490 AC_SUBST(GOLD_LDADD)
 491
 492 dnl Force support for large files by default.  This may need to be
 493 dnl host dependent.  If build == host, we can check getconf LFS_CFLAGS.
 494 LFS_CFLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
 495 AC_SUBST(LFS_CFLAGS)
 496
 497 AC_CHECK_HEADERS(sys/mman.h)
 498 AC_CHECK_FUNCS(chsize mmap)
 499 AC_REPLACE_FUNCS(pread ftruncate ffsll)
 500
 501 AC_CACHE_CHECK([mremap with MREMAP_MAYMOVE], [gold_cv_lib_mremap_maymove],
 502 [AC_LINK_IFELSE([
 503 AC_LANG_PROGRAM([[
 504 #include <sys/mman.h>
 505 void f() { mremap (0, 0, 0, MREMAP_MAYMOVE); }
 506 ]])], [gold_cv_lib_mremap_maymove=yes], [gold_cv_lib_mremap_maymove=no])])
 507 if test "$gold_cv_lib_mremap_maymove" = "yes"; then
 508   AC_DEFINE(HAVE_MREMAP, 1,
 509     [Define to 1 if you have the mremap function with MREMAP_MAYMOVE support])
 510 else
 511   AC_LIBOBJ(mremap)
 512 fi
 513
 514 # Link in zlib if we can.  This allows us to write compressed sections.
 515 AM_ZLIB
 516 AM_CONDITIONAL(HAVE_ZLIB, test "$ac_cv_header_zlib_h" = "yes")
 517
 518 dnl We have to check these in C, not C++, because autoconf generates
 519 dnl tests which have no type information, and current glibc provides
 520 dnl multiple declarations of functions like basename when compiling
 521 dnl with C++.
 522 AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strverscmp])
 523
 524 AC_LANG_PUSH(C++)
 525
 526 AC_CHECK_HEADERS(tr1/unordered_set tr1/unordered_map)
 527 AC_CHECK_HEADERS(ext/hash_map ext/hash_set)
 528 AC_CHECK_HEADERS(byteswap.h)
 529
 530 dnl When plugins enabled dynamic loader interface is required. Check headers
 531 dnl which may provide this interface. In case of dlfcn.h add libdl to link.
 532 AC_CHECK_HEADERS(windows.h)
 533 AC_CHECK_HEADERS(dlfcn.h, [DLOPEN_LIBS="-ldl"], [DLOPEN_LIBS=""])
 534 AC_SUBST(DLOPEN_LIBS)
 535
 536 AC_CHECK_FUNCS(mallinfo posix_fallocate fallocate readv sysconf times)
 537 AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strverscmp, strndup, memmem])
 538
 539 # Use of ::std::tr1::unordered_map::rehash causes undefined symbols
 540 # at link time with some versions of GCC.
 541 AC_CACHE_CHECK([whether ::std::tr1::unordered_map::rehash is usable.],
 542 [gold_cv_unordered_map_rehash],
 543 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[
 544 #include <tr1/unordered_map>
 545 void bar() { ::std::tr1::unordered_map<int, int> x; x.rehash(10); }
 546 ]])], [gold_cv_unordered_map_rehash=yes], [gold_cv_unordered_map_rehash=no])])
 547 if test "$gold_cv_unordered_map_rehash" = "yes"; then
 548   AC_DEFINE(HAVE_TR1_UNORDERED_MAP_REHASH, 1,
 549             [Define if ::std::tr1::unordered_map::rehash is usable])
 550 fi
 551
 552 # Use of tr1/unordered_map with off_t as a key is not supported on GCC
 553 # 4.1.xx when compiling in 32-bit mode with a 64-bit off_t type.
 554 AC_CACHE_CHECK([whether std::tr1::hash<off_t> is defined],
 555 [gold_cv_hash_off_t],
 556 [CXXFLAGS_hold=$CXXFLAGS
 557 CXXFLAGS="$CXXFLAGS $LFS_CFLAGS"
 558 AC_COMPILE_IFELSE([
 559 #include <sys/types.h>
 560 #include <tr1/unordered_map>
 561 std::tr1::hash<off_t> h;
 562 ],
 563 [gold_cv_hash_off_t=yes],
 564 [gold_cv_hash_off_t=no])
 565 CXXFLAGS=$CXXFLAGS_hold])
 566 if test "$gold_cv_hash_off_t" = "yes"; then
 567    AC_DEFINE(HAVE_TR1_HASH_OFF_T, 1,
 568              [Define if std::tr1::hash<off_t> is usable])
 569 fi
 570
 571 # gcc 4.3.0 doesn't recognize the printf attribute on a template
 572 # function.  Check for that.  This is gcc bug 35546.  This test can
 573 # probably be removed after the bug has been fixed for a while.
 574 AC_CACHE_CHECK([whether we can use attributes with template functions],
 575 [gold_cv_template_attribute],
 576 [AC_COMPILE_IFELSE([
 577 template<typename T> extern void foo(const char*, ...)
 578   __attribute__ ((__format__ (__printf__, 1, 2)));
 579 template<typename T> void foo(const char* format, ...) {}
 580 void bar() { foo<int>("%s\n", "foo"); }
 581 ], [gold_cv_template_attribute=yes], [gold_cv_template_attribute=no])])
 582 if test "$gold_cv_template_attribute" = "yes"; then
 583   AC_DEFINE(HAVE_TEMPLATE_ATTRIBUTES, 1,
 584             [Define if attributes work on C++ templates])
 585 fi
 586
 587 dnl Check if the system has struct stat::st_mtim.
 588 AC_CACHE_CHECK([for struct stat::st_mtim.],
 589 [gold_cv_stat_st_mtim],
 590 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 591 #include <sys/stat.h>
 592 long bar() { struct stat s; return (long)(s.st_mtim.tv_sec + s.st_mtim.tv_sec);}
 593 ]])], [gold_cv_stat_st_mtim=yes], [gold_cv_stat_st_mtim=no])])
 594 if test "$gold_cv_stat_st_mtim" = "yes"; then
 595   AC_DEFINE(HAVE_STAT_ST_MTIM, 1,
 596             [Define if struct stat has a field st_mtim with timespec for mtime])
 597 fi
 598
 599 dnl Check if gcc supports the -gpubnames option.
 600 dnl Use -Werror in case of compilers that make unknown -g options warnings.
 601 dnl They would pass the test here, but fail in actual use when $WARN_CFLAGS
 602 dnl gets set later by default Autoconf magic to include -Werror.  (We are
 603 dnl assuming here that there is no compiler that groks -gpubnames
 604 dnl but does not grok -Werror.)
 605 save_CXXFLAGS="$CXXFLAGS"
 606 CXXFLAGS="$CXXFLAGS -Werror -gpubnames"
 607 AC_COMPILE_IFELSE([int i;], [have_pubnames=yes], [have_pubnames=no])
 608 CXXFLAGS="$save_CXXFLAGS"
 609 AM_CONDITIONAL(HAVE_PUBNAMES, test "$have_pubnames" = "yes")
 610
 611 AC_LANG_POP(C++)
 612
 613 AC_CHECK_HEADERS(locale.h)
 614 AC_CHECK_FUNCS(setlocale)
 615 AM_LC_MESSAGES
 616
 617 AM_MAINTAINER_MODE
 618
 619 AC_OUTPUT(Makefile testsuite/Makefile po/Makefile.in:po/Make-in)