gcc/acinclude.m4

   1 dnl Copyright (C) 2005-2016 Free Software Foundation, Inc.
   2 dnl
   3 dnl This file is part of GCC.
   4 dnl
   5 dnl GCC is free software; you can redistribute it and/or modify
   6 dnl it under the terms of the GNU General Public License as published by
   7 dnl the Free Software Foundation; either version 3, or (at your option)
   8 dnl any later version.
   9 dnl
  10 dnl GCC is distributed in the hope that it will be useful,
  11 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 dnl GNU General Public License for more details.
  14 dnl
  15 dnl You should have received a copy of the GNU General Public License
  16 dnl along with GCC; see the file COPYING3.  If not see
  17 dnl <http://www.gnu.org/licenses/>.
  18
  19 dnl See whether we need a declaration for a function.
  20 dnl The result is highly dependent on the INCLUDES passed in, so make sure
  21 dnl to use a different cache variable name in this macro if it is invoked
  22 dnl in a different context somewhere else.
  23 dnl gcc_AC_CHECK_DECL(SYMBOL,
  24 dnl     [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, INCLUDES]]])
  25 AC_DEFUN([gcc_AC_CHECK_DECL],
  26 [AC_MSG_CHECKING([whether $1 is declared])
  27 AC_CACHE_VAL(gcc_cv_have_decl_$1,
  28 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4],
  29 [#ifndef $1
  30 char *(*pfn) = (char *(*)) $1 ;
  31 #endif])], eval "gcc_cv_have_decl_$1=yes", eval "gcc_cv_have_decl_$1=no")])
  32 if eval "test \"`echo '$gcc_cv_have_decl_'$1`\" = yes"; then
  33   AC_MSG_RESULT(yes) ; ifelse([$2], , :, [$2])
  34 else
  35   AC_MSG_RESULT(no) ; ifelse([$3], , :, [$3])
  36 fi
  37 ])dnl
  38
  39 dnl Check multiple functions to see whether each needs a declaration.
  40 dnl Arrange to define HAVE_DECL_<FUNCTION> to 0 or 1 as appropriate.
  41 dnl gcc_AC_CHECK_DECLS(SYMBOLS,
  42 dnl     [ACTION-IF-NEEDED [, ACTION-IF-NOT-NEEDED [, INCLUDES]]])
  43 AC_DEFUN([gcc_AC_CHECK_DECLS],
  44 [AC_FOREACH([gcc_AC_Func], [$1],
  45   [AH_TEMPLATE(AS_TR_CPP(HAVE_DECL_[]gcc_AC_Func),
  46   [Define to 1 if we found a declaration for ']gcc_AC_Func[', otherwise
  47    define to 0.])])dnl
  48 for ac_func in $1
  49 do
  50   ac_tr_decl=AS_TR_CPP([HAVE_DECL_$ac_func])
  51 gcc_AC_CHECK_DECL($ac_func,
  52   [AC_DEFINE_UNQUOTED($ac_tr_decl, 1) $2],
  53   [AC_DEFINE_UNQUOTED($ac_tr_decl, 0) $3],
  54 dnl It is possible that the include files passed in here are local headers
  55 dnl which supply a backup declaration for the relevant prototype based on
  56 dnl the definition of (or lack of) the HAVE_DECL_ macro.  If so, this test
  57 dnl will always return success.  E.g. see libiberty.h's handling of
  58 dnl `basename'.  To avoid this, we define the relevant HAVE_DECL_ macro to
  59 dnl 1 so that any local headers used do not provide their own prototype
  60 dnl during this test.
  61 #undef $ac_tr_decl
  62 #define $ac_tr_decl 1
  63   $4
  64 )
  65 done
  66 ])
  67
  68 dnl 'make compare' can be significantly faster, if cmp itself can
  69 dnl skip bytes instead of using tail.  The test being performed is
  70 dnl "if cmp --ignore-initial=2 t1 t2 && ! cmp --ignore-initial=1 t1 t2"
  71 dnl but we need to sink errors and handle broken shells.  We also test
  72 dnl for the parameter format "cmp file1 file2 skip1 skip2" which is
  73 dnl accepted by cmp on some systems.
  74 AC_DEFUN([gcc_AC_PROG_CMP_IGNORE_INITIAL],
  75 [AC_CACHE_CHECK([for cmp's capabilities], gcc_cv_prog_cmp_skip,
  76 [ echo abfoo >t1
  77   echo cdfoo >t2
  78   gcc_cv_prog_cmp_skip=slowcompare
  79   if cmp --ignore-initial=2 t1 t2 > /dev/null 2>&1; then
  80     if cmp --ignore-initial=1 t1 t2 > /dev/null 2>&1; then
  81       :
  82     else
  83       gcc_cv_prog_cmp_skip=gnucompare
  84     fi
  85   fi
  86   if test $gcc_cv_prog_cmp_skip = slowcompare ; then
  87     if cmp t1 t2 2 2 > /dev/null 2>&1; then
  88       if cmp t1 t2 1 1 > /dev/null 2>&1; then
  89         :
  90       else
  91         gcc_cv_prog_cmp_skip=fastcompare
  92       fi
  93     fi
  94   fi
  95   rm t1 t2
  96 ])
  97 make_compare_target=$gcc_cv_prog_cmp_skip
  98 AC_SUBST(make_compare_target)
  99 ])
 100
 101 dnl See if symbolic links work and if not, try to substitute either hard links or simple copy.
 102 AC_DEFUN([gcc_AC_PROG_LN_S],
 103 [AC_MSG_CHECKING(whether ln -s works)
 104 AC_CACHE_VAL(gcc_cv_prog_LN_S,
 105 [rm -f conftestdata_t
 106 echo >conftestdata_f
 107 if ln -s conftestdata_f conftestdata_t 2>/dev/null
 108 then
 109   gcc_cv_prog_LN_S="ln -s"
 110 else
 111   if ln conftestdata_f conftestdata_t 2>/dev/null
 112   then
 113     gcc_cv_prog_LN_S=ln
 114   else
 115     if cp -p conftestdata_f conftestdata_t 2>/dev/null
 116     then
 117       gcc_cv_prog_LN_S="cp -p"
 118     else
 119       gcc_cv_prog_LN_S=cp
 120     fi
 121   fi
 122 fi
 123 rm -f conftestdata_f conftestdata_t
 124 ])dnl
 125 LN_S="$gcc_cv_prog_LN_S"
 126 if test "$gcc_cv_prog_LN_S" = "ln -s"; then
 127   AC_MSG_RESULT(yes)
 128 else
 129   if test "$gcc_cv_prog_LN_S" = "ln"; then
 130     AC_MSG_RESULT([no, using ln])
 131   else
 132     AC_MSG_RESULT([no, and neither does ln, so using $gcc_cv_prog_LN_S])
 133   fi
 134 fi
 135 AC_SUBST(LN_S)dnl
 136 ])
 137
 138 dnl Define MKDIR_TAKES_ONE_ARG if mkdir accepts only one argument instead
 139 dnl of the usual 2.
 140 AC_DEFUN([gcc_AC_FUNC_MKDIR_TAKES_ONE_ARG],
 141 [AC_CACHE_CHECK([if mkdir takes one argument], gcc_cv_mkdir_takes_one_arg,
 142 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
 143 #include <sys/types.h>
 144 #ifdef HAVE_SYS_STAT_H
 145 # include <sys/stat.h>
 146 #endif
 147 #ifdef HAVE_UNISTD_H
 148 # include <unistd.h>
 149 #endif
 150 #ifdef HAVE_DIRECT_H
 151 # include <direct.h>
 152 #endif], [mkdir ("foo", 0);])],
 153         gcc_cv_mkdir_takes_one_arg=no, gcc_cv_mkdir_takes_one_arg=yes)])
 154 if test $gcc_cv_mkdir_takes_one_arg = yes ; then
 155   AC_DEFINE(MKDIR_TAKES_ONE_ARG, 1, [Define if host mkdir takes a single argument.])
 156 fi
 157 ])
 158
 159 AC_DEFUN([gcc_AC_PROG_INSTALL],
 160 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
 161 # Find a good install program.  We prefer a C program (faster),
 162 # so one script is as good as another.  But avoid the broken or
 163 # incompatible versions:
 164 # SysV /etc/install, /usr/sbin/install
 165 # SunOS /usr/etc/install
 166 # IRIX /sbin/install
 167 # AIX /bin/install
 168 # AFS /usr/afsws/bin/install, which mishandles nonexistent args
 169 # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
 170 # ./install, which can be erroneously created by make from ./install.sh.
 171 AC_MSG_CHECKING(for a BSD compatible install)
 172 if test -z "$INSTALL"; then
 173 AC_CACHE_VAL(ac_cv_path_install,
 174 [  IFS="${IFS=  }"; ac_save_IFS="$IFS"; IFS="${IFS}:"
 175   for ac_dir in $PATH; do
 176     # Account for people who put trailing slashes in PATH elements.
 177     case "$ac_dir/" in
 178     /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;;
 179     *)
 180       # OSF1 and SCO ODT 3.0 have their own names for install.
 181       for ac_prog in ginstall scoinst install; do
 182         if test -f $ac_dir/$ac_prog; then
 183           if test $ac_prog = install &&
 184             grep dspmsg $ac_dir/$ac_prog >/dev/null 2>&1; then
 185             # AIX install.  It has an incompatible calling convention.
 186             # OSF/1 installbsd also uses dspmsg, but is usable.
 187             :
 188           else
 189             ac_cv_path_install="$ac_dir/$ac_prog -c"
 190             break 2
 191           fi
 192         fi
 193       done
 194       ;;
 195     esac
 196   done
 197   IFS="$ac_save_IFS"
 198 ])dnl
 199   if test "${ac_cv_path_install+set}" = set; then
 200     INSTALL="$ac_cv_path_install"
 201   else
 202     # As a last resort, use the slow shell script.  We don't cache a
 203     # path for INSTALL within a source directory, because that will
 204     # break other packages using the cache if that directory is
 205     # removed, or if the path is relative.
 206     INSTALL="$ac_install_sh"
 207   fi
 208 fi
 209 dnl We do special magic for INSTALL instead of AC_SUBST, to get
 210 dnl relative paths right.
 211 AC_MSG_RESULT($INSTALL)
 212 AC_SUBST(INSTALL)dnl
 213
 214 # Use test -z because SunOS4 sh mishandles braces in ${var-val}.
 215 # It thinks the first close brace ends the variable substitution.
 216 test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}'
 217 AC_SUBST(INSTALL_PROGRAM)dnl
 218
 219 test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
 220 AC_SUBST(INSTALL_DATA)dnl
 221 ])
 222
 223 dnl Determine if enumerated bitfields are unsigned.   ISO C says they can
 224 dnl be either signed or unsigned.
 225 dnl
 226 AC_DEFUN([gcc_AC_C_ENUM_BF_UNSIGNED],
 227 [AC_CACHE_CHECK(for unsigned enumerated bitfields, gcc_cv_enum_bf_unsigned,
 228 [AC_RUN_IFELSE([AC_LANG_SOURCE([#include <stdlib.h>
 229 enum t { BLAH = 128 } ;
 230 struct s_t { enum t member : 8; } s ;
 231 int main(void)
 232 {
 233         s.member = BLAH;
 234         if (s.member < 0) exit(1);
 235         exit(0);
 236
 237 }])], gcc_cv_enum_bf_unsigned=yes, gcc_cv_enum_bf_unsigned=no, gcc_cv_enum_bf_unsigned=yes)])
 238 if test $gcc_cv_enum_bf_unsigned = yes; then
 239   AC_DEFINE(ENUM_BITFIELDS_ARE_UNSIGNED, 1,
 240     [Define if enumerated bitfields are treated as unsigned values.])
 241 fi])
 242
 243 dnl Probe number of bits in a byte.
 244 dnl Note C89 requires CHAR_BIT >= 8.
 245 dnl
 246 AC_DEFUN([gcc_AC_C_CHAR_BIT],
 247 [AC_CACHE_CHECK(for CHAR_BIT, gcc_cv_decl_char_bit,
 248 [AC_EGREP_CPP(found,
 249 [#ifdef HAVE_LIMITS_H
 250 #include <limits.h>
 251 #endif
 252 #ifdef CHAR_BIT
 253 found
 254 #endif], gcc_cv_decl_char_bit=yes, gcc_cv_decl_char_bit=no)
 255 ])
 256 if test $gcc_cv_decl_char_bit = no; then
 257   AC_CACHE_CHECK(number of bits in a byte, gcc_cv_c_nbby,
 258 [i=8
 259  gcc_cv_c_nbby=
 260  while test $i -lt 65; do
 261    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
 262      [switch(0) {
 263   case (unsigned char)((unsigned long)1 << $i) == ((unsigned long)1 << $i):
 264   case (unsigned char)((unsigned long)1<<($i-1)) == ((unsigned long)1<<($i-1)):
 265   ; }])],
 266      [gcc_cv_c_nbby=$i; break])
 267    i=`expr $i + 1`
 268  done
 269  test -z "$gcc_cv_c_nbby" && gcc_cv_c_nbby=failed
 270 ])
 271 if test $gcc_cv_c_nbby = failed; then
 272   AC_MSG_ERROR(cannot determine number of bits in a byte)
 273 else
 274   AC_DEFINE_UNQUOTED(CHAR_BIT, $gcc_cv_c_nbby,
 275   [Define as the number of bits in a byte, if `limits.h' doesn't.])
 276 fi
 277 fi])
 278
 279 AC_DEFUN([gcc_AC_INITFINI_ARRAY],
 280 [AC_REQUIRE([gcc_SUN_LD_VERSION])dnl
 281 AC_ARG_ENABLE(initfini-array,
 282         [  --enable-initfini-array      use .init_array/.fini_array sections],
 283         [], [
 284 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
 285                  gcc_cv_initfini_array, [dnl
 286   if test "x${build}" = "x${target}" && test "x${build}" = "x${host}"; then
 287     case "${target}" in
 288       ia64-*)
 289         AC_RUN_IFELSE([AC_LANG_SOURCE([
 290 #ifndef __ELF__
 291 #error Not an ELF OS
 292 #endif
 293 /* We turn on .preinit_array/.init_array/.fini_array support for ia64
 294    if it can be used.  */
 295 static int x = -1;
 296 int main (void) { return x; }
 297 int foo (void) { x = 0; }
 298 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
 299 ])],
 300              [gcc_cv_initfini_array=yes], [gcc_cv_initfini_array=no],
 301              [gcc_cv_initfini_array=no]);;
 302       *)
 303         gcc_cv_initfini_array=no
 304         if test $in_tree_ld = yes ; then
 305           if test "$gcc_cv_gld_major_version" -eq 2 \
 306              -a "$gcc_cv_gld_minor_version" -ge 22 \
 307              -o "$gcc_cv_gld_major_version" -gt 2 \
 308              && test $in_tree_ld_is_elf = yes; then
 309             gcc_cv_initfini_array=yes
 310           fi
 311         elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x ; then
 312           case $target:$gas in
 313             *:yes)
 314               sh_flags='"a"'
 315               sh_type='%progbits'
 316               ;;
 317             i?86-*-solaris2*:no | x86_64-*-solaris2*:no)
 318               sh_flags='"a"'
 319               sh_type='@progbits'
 320               ;;
 321             sparc*-*-solaris2*:no)
 322               sh_flags='#alloc'
 323               sh_type='#progbits'
 324               sh_quote='"'
 325               ;;
 326           esac
 327           case "$target:$gnu_ld" in
 328             *:yes)
 329               cat > conftest.s <<EOF
 330 .section .dtors,$sh_flags,$sh_type
 331 .balign 4
 332 .byte 'A', 'A', 'A', 'A'
 333 .section .ctors,$sh_flags,$sh_type
 334 .balign 4
 335 .byte 'B', 'B', 'B', 'B'
 336 .section .fini_array.65530,$sh_flags,$sh_type
 337 .balign 4
 338 .byte 'C', 'C', 'C', 'C'
 339 .section .init_array.65530,$sh_flags,$sh_type
 340 .balign 4
 341 .byte 'D', 'D', 'D', 'D'
 342 .section .dtors.64528,$sh_flags,$sh_type
 343 .balign 4
 344 .byte 'E', 'E', 'E', 'E'
 345 .section .ctors.64528,$sh_flags,$sh_type
 346 .balign 4
 347 .byte 'F', 'F', 'F', 'F'
 348 .section .fini_array.01005,$sh_flags,$sh_type
 349 .balign 4
 350 .byte 'G', 'G', 'G', 'G'
 351 .section .init_array.01005,$sh_flags,$sh_type
 352 .balign 4
 353 .byte 'H', 'H', 'H', 'H'
 354 .text
 355 .globl _start
 356 _start:
 357 EOF
 358               if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1 \
 359                  && $gcc_cv_ld -o conftest conftest.o > /dev/null 2>&1 \
 360                  && $gcc_cv_objdump -s -j .init_array conftest \
 361                     | grep HHHHFFFFDDDDBBBB > /dev/null 2>&1 \
 362                  && $gcc_cv_objdump -s -j .fini_array conftest \
 363                     | grep GGGGEEEECCCCAAAA > /dev/null 2>&1; then
 364                 gcc_cv_initfini_array=yes
 365               fi
 366               ;;
 367             *-*-solaris2*:no)
 368               # When Solaris ld added constructor priority support, it was
 369               # decided to only handle .init_array.N/.fini_array.N since
 370               # there was no need for backwards compatibility with
 371               # .ctors.N/.dtors.N.  .ctors/.dtors remain as separate
 372               # sections with correct execution order resp. to
 373               # .init_array/.fini_array, while gld merges them into
 374               # .init_array/.fini_array.
 375               cat > conftest.s <<EOF
 376 .section $sh_quote.fini_array.65530$sh_quote,$sh_flags,$sh_type
 377 .align 4
 378 .byte 'C', 'C', 'C', 'C'
 379 .section $sh_quote.init_array.65530$sh_quote,$sh_flags,$sh_type
 380 .align 4
 381 .byte 'D', 'D', 'D', 'D'
 382 .section $sh_quote.fini_array.01005$sh_quote,$sh_flags,$sh_type
 383 .align 4
 384 .byte 'G', 'G', 'G', 'G'
 385 .section $sh_quote.init_array.01005$sh_quote,$sh_flags,$sh_type
 386 .align 4
 387 .byte 'H', 'H', 'H', 'H'
 388 .text
 389 .globl _start
 390 _start:
 391 EOF
 392               if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1 \
 393                  && $gcc_cv_ld -o conftest conftest.o > /dev/null 2>&1 \
 394                  && $gcc_cv_objdump -s -j .init_array conftest \
 395                     | grep HHHHDDDD > /dev/null 2>&1 \
 396                  && $gcc_cv_objdump -s -j .fini_array conftest \
 397                     | grep GGGGCCCC > /dev/null 2>&1; then
 398                 gcc_cv_initfini_array=yes
 399               fi
 400               ;;
 401             esac
 402 changequote(,)dnl
 403           rm -f conftest conftest.*
 404 changequote([,])dnl
 405         fi
 406         AC_PREPROC_IFELSE([AC_LANG_SOURCE([
 407 #ifndef __ELF__
 408 # error Not an ELF OS
 409 #endif
 410 #include <stdlib.h>
 411 #if defined __GLIBC_PREREQ
 412 # if __GLIBC_PREREQ (2, 4)
 413 # else
 414 #  error GLIBC 2.4 required
 415 # endif
 416 #else
 417 # if defined __sun__ && defined __svr4__
 418    /* Solaris ld.so.1 supports .init_array/.fini_array since Solaris 8.  */
 419 # else
 420 #  error The C library not known to support .init_array/.fini_array
 421 # endif
 422 #endif
 423 ])],, [gcc_cv_initfini_array=no]);;
 424     esac
 425   else
 426     AC_MSG_CHECKING(cross compile... guessing)
 427     gcc_cv_initfini_array=no
 428   fi])
 429   enable_initfini_array=$gcc_cv_initfini_array
 430 ])
 431 AC_DEFINE_UNQUOTED(HAVE_INITFINI_ARRAY_SUPPORT,
 432   [`if test $enable_initfini_array = yes; then echo 1; else echo 0; fi`],
 433   [Define 0/1 if .init_array/.fini_array sections are available and working.])
 434 ])
 435
 436 dnl # _gcc_COMPUTE_GAS_VERSION
 437 dnl # Used by gcc_GAS_VERSION_GTE_IFELSE
 438 dnl #
 439 dnl # WARNING:
 440 dnl # gcc_cv_as_gas_srcdir must be defined before this.
 441 dnl # This gross requirement will go away eventually.
 442 AC_DEFUN([_gcc_COMPUTE_GAS_VERSION],
 443 [gcc_cv_as_bfd_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/bfd
 444 for f in $gcc_cv_as_bfd_srcdir/configure \
 445          $gcc_cv_as_gas_srcdir/configure \
 446          $gcc_cv_as_gas_srcdir/configure.ac \
 447          $gcc_cv_as_gas_srcdir/Makefile.in ; do
 448   gcc_cv_gas_version=`sed -n -e 's/^[[  ]]*VERSION=[[^0-9A-Za-z_]]*\([[0-9]]*\.[[0-9]]*.*\)/VERSION=\1/p' < $f`
 449   if test x$gcc_cv_gas_version != x; then
 450     break
 451   fi
 452 done
 453 case $gcc_cv_gas_version in
 454   VERSION=[[0-9]]*) ;;
 455   *) AC_MSG_ERROR([[cannot find version of in-tree assembler]]);;
 456 esac
 457 gcc_cv_gas_major_version=`expr "$gcc_cv_gas_version" : "VERSION=\([[0-9]]*\)"`
 458 gcc_cv_gas_minor_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.\([[0-9]]*\)"`
 459 gcc_cv_gas_patch_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)"`
 460 case $gcc_cv_gas_patch_version in
 461   "") gcc_cv_gas_patch_version="0" ;;
 462 esac
 463 gcc_cv_gas_vers=`expr \( \( $gcc_cv_gas_major_version \* 1000 \) \
 464                             + $gcc_cv_gas_minor_version \) \* 1000 \
 465                             + $gcc_cv_gas_patch_version`
 466 ]) []dnl # _gcc_COMPUTE_GAS_VERSION
 467
 468 dnl # gcc_GAS_VERSION_GTE_IFELSE([elf,] major, minor, patchlevel,
 469 dnl #                     [command_if_true = :], [command_if_false = :])
 470 dnl # Check to see if the version of GAS is greater than or
 471 dnl # equal to the specified version.
 472 dnl #
 473 dnl # The first ifelse() shortens the shell code if the patchlevel
 474 dnl # is unimportant (the usual case).  The others handle missing
 475 dnl # commands.  Note that the tests are structured so that the most
 476 dnl # common version number cases are tested first.
 477 AC_DEFUN([_gcc_GAS_VERSION_GTE_IFELSE],
 478 [ifelse([$1], elf,
 479  [if test $in_tree_gas_is_elf = yes \
 480   &&],
 481  [if]) test $gcc_cv_gas_vers -ge `expr \( \( $2 \* 1000 \) + $3 \) \* 1000 + $4`
 482   then dnl
 483 ifelse([$5],,:,[$5])[]dnl
 484 ifelse([$6],,,[
 485   else $6])
 486 fi])
 487
 488 AC_DEFUN([gcc_GAS_VERSION_GTE_IFELSE],
 489 [AC_REQUIRE([_gcc_COMPUTE_GAS_VERSION])dnl
 490 ifelse([$1], elf, [_gcc_GAS_VERSION_GTE_IFELSE($@)],
 491                   [_gcc_GAS_VERSION_GTE_IFELSE(,$@)])])
 492
 493 dnl # gcc_GAS_FLAGS
 494 dnl # Used by gcc_GAS_CHECK_FEATURE
 495 dnl #
 496 AC_DEFUN([gcc_GAS_FLAGS],
 497 [AC_CACHE_CHECK([assembler flags], gcc_cv_as_flags,
 498 [ case "$target" in
 499   i[[34567]]86-*-linux*)
 500     dnl Override the default, which may be incompatible.
 501     gcc_cv_as_flags=--32
 502     ;;
 503   x86_64-*-linux-gnux32)
 504     dnl Override the default, which may be incompatible.
 505     gcc_cv_as_flags=--x32
 506     ;;
 507   x86_64-*-linux*)
 508     dnl Override the default, which may be incompatible.
 509     gcc_cv_as_flags=--64
 510     ;;
 511   powerpc*-*-darwin*)
 512     dnl Always pass -arch ppc to assembler.
 513     gcc_cv_as_flags="-arch ppc"
 514     ;;
 515   *)
 516     gcc_cv_as_flags=" "
 517     ;;
 518   esac])
 519 ])
 520
 521 dnl gcc_GAS_CHECK_FEATURE(description, cv, [[elf,]major,minor,patchlevel],
 522 dnl [extra switches to as], [assembler input],
 523 dnl [extra testing logic], [command if feature available])
 524 dnl
 525 dnl Checks for an assembler feature.  If we are building an in-tree
 526 dnl gas, the feature is available if the associated assembler version
 527 dnl is greater than or equal to major.minor.patchlevel.  If not, then
 528 dnl ASSEMBLER INPUT is fed to the assembler and the feature is available
 529 dnl if assembly succeeds.  If EXTRA TESTING LOGIC is not the empty string,
 530 dnl then it is run instead of simply setting CV to "yes" - it is responsible
 531 dnl for doing so, if appropriate.
 532 AC_DEFUN([gcc_GAS_CHECK_FEATURE],
 533 [AC_REQUIRE([gcc_GAS_FLAGS])dnl
 534 AC_CACHE_CHECK([assembler for $1], [$2],
 535  [[$2]=no
 536   ifelse([$3],,,[dnl
 537   if test $in_tree_gas = yes; then
 538     gcc_GAS_VERSION_GTE_IFELSE($3, [[$2]=yes])
 539   el])if test x$gcc_cv_as != x; then
 540     AS_ECHO([ifelse(m4_substr([$5],0,1),[$], "[$5]", '[$5]')]) > conftest.s
 541     if AC_TRY_COMMAND([$gcc_cv_as $gcc_cv_as_flags $4 -o conftest.o conftest.s >&AS_MESSAGE_LOG_FD])
 542     then
 543         ifelse([$6],, [$2]=yes, [$6])
 544     else
 545       echo "configure: failed program was" >&AS_MESSAGE_LOG_FD
 546       cat conftest.s >&AS_MESSAGE_LOG_FD
 547     fi
 548     rm -f conftest.o conftest.s
 549   fi])
 550 ifelse([$7],,,[dnl
 551 if test $[$2] = yes; then
 552   $7
 553 fi])])
 554
 555 dnl gcc_SUN_LD_VERSION
 556 dnl
 557 dnl Determines Sun linker version numbers, setting gcc_cv_sun_ld_vers to
 558 dnl the complete version number and gcc_cv_sun_ld_vers_{major, minor} to
 559 dnl the corresponding fields.
 560 dnl
 561 dnl ld and ld.so.1 are guaranteed to be updated in lockstep, so ld version
 562 dnl numbers can be used in ld.so.1 feature checks even if a different
 563 dnl linker is configured.
 564 dnl
 565 AC_DEFUN([gcc_SUN_LD_VERSION],
 566 [changequote(,)dnl
 567 if test "x${build}" = "x${target}" && test "x${build}" = "x${host}"; then
 568   case "${target}" in
 569     *-*-solaris2*)
 570       #
 571       # Solaris 2 ld -V output looks like this for a regular version:
 572       #
 573       # ld: Software Generation Utilities - Solaris Link Editors: 5.11-1.1699
 574       #
 575       # but test versions add stuff at the end:
 576       #
 577       # ld: Software Generation Utilities - Solaris Link Editors: 5.11-1.1701:onnv-ab196087-6931056-03/25/10
 578       #
 579       gcc_cv_sun_ld_ver=`/usr/ccs/bin/ld -V 2>&1`
 580       if echo "$gcc_cv_sun_ld_ver" | grep 'Solaris Link Editors' > /dev/null; then
 581         gcc_cv_sun_ld_vers=`echo $gcc_cv_sun_ld_ver | sed -n \
 582           -e 's,^.*: 5\.[0-9][0-9]*-\([0-9]\.[0-9][0-9]*\).*$,\1,p'`
 583         gcc_cv_sun_ld_vers_major=`expr "$gcc_cv_sun_ld_vers" : '\([0-9]*\)'`
 584         gcc_cv_sun_ld_vers_minor=`expr "$gcc_cv_sun_ld_vers" : '[0-9]*\.\([0-9]*\)'`
 585       fi
 586       ;;
 587   esac
 588 fi
 589 changequote([,])dnl
 590 ])
 591
 592 dnl GCC_TARGET_TEMPLATE(KEY)
 593 dnl ------------------------
 594 dnl Define KEY as a valid configure key on the target machine.
 595
 596 m4_define([GCC_TARGET_TEMPLATE],
 597 [m4_define([GCC_TARGET_TEMPLATE($1)],[])])
 598
 599 dnl AH_TEMPLATE(KEY, DESCRIPTION)
 600 dnl -----------------------------
 601 dnl Issue an autoheader template for KEY, i.e., a comment composed of
 602 dnl DESCRIPTION (properly wrapped), and then #undef KEY.  Redefinition
 603 dnl of the macro in autoheader.m4, to support definition of only a few
 604 dnl keys while compiling target libraries.
 605
 606 m4_define([AH_TEMPLATE],
 607 [AH_VERBATIM([$1],m4_text_wrap([$2 */], [   ], [/* ])
 608 m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[#ifndef USED_FOR_TARGET
 609 ])[#undef $1]m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[
 610 #endif
 611 ]))])
 612
 613 dnl Make sure that build_exeext is looked for
 614 AC_DEFUN([gcc_AC_BUILD_EXEEXT], [
 615 ac_executable_extensions="$build_exeext"])
 616
 617 dnl GCC_GLIBC_VERSION_GTE_IFELSE(MAJOR, MINOR, IF-TRUE, IF-FALSE)
 618 dnl -------------------------------------------------------------
 619 dnl If the target glibc version ($glibc_version_major.$glibc_version_minor)
 620 dnl is at least MAJOR.MINOR, call IF-TRUE, otherwise call IF-FALSE.
 621 AC_DEFUN([GCC_GLIBC_VERSION_GTE_IFELSE],
 622 [
 623 AS_IF([test $glibc_version_major -gt $1 \
 624   || ( test $glibc_version_major -eq $1 && test $glibc_version_minor -ge $2 )],
 625 [$3], [$4])])