gcc/acinclude.m4

   1 dnl Copyright (C) 2005, 2006, 2007, 2008 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='${INSTALL} -m 644'
 220 AC_SUBST(INSTALL_DATA)dnl
 221 ])
 222
 223 # mmap(2) blacklisting.  Some platforms provide the mmap library routine
 224 # but don't support all of the features we need from it.
 225 AC_DEFUN([gcc_AC_FUNC_MMAP_BLACKLIST],
 226 [
 227 AC_CHECK_HEADER([sys/mman.h],
 228                 [gcc_header_sys_mman_h=yes], [gcc_header_sys_mman_h=no])
 229 AC_CHECK_FUNC([mmap], [gcc_func_mmap=yes], [gcc_func_mmap=no])
 230 if test "$gcc_header_sys_mman_h" != yes \
 231  || test "$gcc_func_mmap" != yes; then
 232    gcc_cv_func_mmap_file=no
 233    gcc_cv_func_mmap_dev_zero=no
 234    gcc_cv_func_mmap_anon=no
 235 else
 236    AC_CACHE_CHECK([whether read-only mmap of a plain file works],
 237   gcc_cv_func_mmap_file,
 238   [# Add a system to this blacklist if
 239    # mmap(0, stat_size, PROT_READ, MAP_PRIVATE, fd, 0) doesn't return a
 240    # memory area containing the same data that you'd get if you applied
 241    # read() to the same fd.  The only system known to have a problem here
 242    # is VMS, where text files have record structure.
 243    case "$host_os" in
 244      vms* | ultrix*)
 245         gcc_cv_func_mmap_file=no ;;
 246      *)
 247         gcc_cv_func_mmap_file=yes;;
 248    esac])
 249    AC_CACHE_CHECK([whether mmap from /dev/zero works],
 250   gcc_cv_func_mmap_dev_zero,
 251   [# Add a system to this blacklist if it has mmap() but /dev/zero
 252    # does not exist, or if mmapping /dev/zero does not give anonymous
 253    # zeroed pages with both the following properties:
 254    # 1. If you map N consecutive pages in with one call, and then
 255    #    unmap any subset of those pages, the pages that were not
 256    #    explicitly unmapped remain accessible.
 257    # 2. If you map two adjacent blocks of memory and then unmap them
 258    #    both at once, they must both go away.
 259    # Systems known to be in this category are Windows (all variants),
 260    # VMS, and Darwin.
 261    case "$host_os" in
 262      vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)
 263         gcc_cv_func_mmap_dev_zero=no ;;
 264      *)
 265         gcc_cv_func_mmap_dev_zero=yes;;
 266    esac])
 267
 268    # Unlike /dev/zero, the MAP_ANON(YMOUS) defines can be probed for.
 269    AC_CACHE_CHECK([for MAP_ANON(YMOUS)], gcc_cv_decl_map_anon,
 270     [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
 271 [#include <sys/types.h>
 272 #include <sys/mman.h>
 273 #include <unistd.h>
 274
 275 #ifndef MAP_ANONYMOUS
 276 #define MAP_ANONYMOUS MAP_ANON
 277 #endif
 278 ],
 279 [int n = MAP_ANONYMOUS;])],
 280     gcc_cv_decl_map_anon=yes,
 281     gcc_cv_decl_map_anon=no)])
 282
 283    if test $gcc_cv_decl_map_anon = no; then
 284      gcc_cv_func_mmap_anon=no
 285    else
 286      AC_CACHE_CHECK([whether mmap with MAP_ANON(YMOUS) works],
 287      gcc_cv_func_mmap_anon,
 288   [# Add a system to this blacklist if it has mmap() and MAP_ANON or
 289    # MAP_ANONYMOUS, but using mmap(..., MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
 290    # doesn't give anonymous zeroed pages with the same properties listed
 291    # above for use of /dev/zero.
 292    # Systems known to be in this category are Windows, VMS, and SCO Unix.
 293    case "$host_os" in
 294      vms* | cygwin* | pe | mingw* | sco* | udk* )
 295         gcc_cv_func_mmap_anon=no ;;
 296      *)
 297         gcc_cv_func_mmap_anon=yes;;
 298    esac])
 299    fi
 300 fi
 301
 302 if test $gcc_cv_func_mmap_file = yes; then
 303   AC_DEFINE(HAVE_MMAP_FILE, 1,
 304             [Define if read-only mmap of a plain file works.])
 305 fi
 306 if test $gcc_cv_func_mmap_dev_zero = yes; then
 307   AC_DEFINE(HAVE_MMAP_DEV_ZERO, 1,
 308             [Define if mmap of /dev/zero works.])
 309 fi
 310 if test $gcc_cv_func_mmap_anon = yes; then
 311   AC_DEFINE(HAVE_MMAP_ANON, 1,
 312             [Define if mmap with MAP_ANON(YMOUS) works.])
 313 fi
 314 ])
 315
 316 dnl Determine if enumerated bitfields are unsigned.   ISO C says they can
 317 dnl be either signed or unsigned.
 318 dnl
 319 AC_DEFUN([gcc_AC_C_ENUM_BF_UNSIGNED],
 320 [AC_CACHE_CHECK(for unsigned enumerated bitfields, gcc_cv_enum_bf_unsigned,
 321 [AC_RUN_IFELSE([AC_LANG_SOURCE([#include <stdlib.h>
 322 enum t { BLAH = 128 } ;
 323 struct s_t { enum t member : 8; } s ;
 324 int main(void)
 325 {
 326         s.member = BLAH;
 327         if (s.member < 0) exit(1);
 328         exit(0);
 329
 330 }])], gcc_cv_enum_bf_unsigned=yes, gcc_cv_enum_bf_unsigned=no, gcc_cv_enum_bf_unsigned=yes)])
 331 if test $gcc_cv_enum_bf_unsigned = yes; then
 332   AC_DEFINE(ENUM_BITFIELDS_ARE_UNSIGNED, 1,
 333     [Define if enumerated bitfields are treated as unsigned values.])
 334 fi])
 335
 336 dnl Probe number of bits in a byte.
 337 dnl Note C89 requires CHAR_BIT >= 8.
 338 dnl
 339 AC_DEFUN([gcc_AC_C_CHAR_BIT],
 340 [AC_CACHE_CHECK(for CHAR_BIT, gcc_cv_decl_char_bit,
 341 [AC_EGREP_CPP(found,
 342 [#ifdef HAVE_LIMITS_H
 343 #include <limits.h>
 344 #endif
 345 #ifdef CHAR_BIT
 346 found
 347 #endif], gcc_cv_decl_char_bit=yes, gcc_cv_decl_char_bit=no)
 348 ])
 349 if test $gcc_cv_decl_char_bit = no; then
 350   AC_CACHE_CHECK(number of bits in a byte, gcc_cv_c_nbby,
 351 [i=8
 352  gcc_cv_c_nbby=
 353  while test $i -lt 65; do
 354    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
 355      [switch(0) {
 356   case (unsigned char)((unsigned long)1 << $i) == ((unsigned long)1 << $i):
 357   case (unsigned char)((unsigned long)1<<($i-1)) == ((unsigned long)1<<($i-1)):
 358   ; }])],
 359      [gcc_cv_c_nbby=$i; break])
 360    i=`expr $i + 1`
 361  done
 362  test -z "$gcc_cv_c_nbby" && gcc_cv_c_nbby=failed
 363 ])
 364 if test $gcc_cv_c_nbby = failed; then
 365   AC_MSG_ERROR(cannot determine number of bits in a byte)
 366 else
 367   AC_DEFINE_UNQUOTED(CHAR_BIT, $gcc_cv_c_nbby,
 368   [Define as the number of bits in a byte, if `limits.h' doesn't.])
 369 fi
 370 fi])
 371
 372 AC_DEFUN([gcc_AC_INITFINI_ARRAY],
 373 [AC_ARG_ENABLE(initfini-array,
 374         [  --enable-initfini-array      use .init_array/.fini_array sections],
 375         [], [
 376 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
 377                  gcc_cv_initfini_array, [dnl
 378   AC_RUN_IFELSE([AC_LANG_SOURCE([
 379 static int x = -1;
 380 int main (void) { return x; }
 381 int foo (void) { x = 0; }
 382 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;])],
 383              [gcc_cv_initfini_array=yes], [gcc_cv_initfini_array=no],
 384              [gcc_cv_initfini_array=no])])
 385   enable_initfini_array=$gcc_cv_initfini_array
 386 ])
 387 if test $enable_initfini_array = yes; then
 388   AC_DEFINE(HAVE_INITFINI_ARRAY, 1,
 389     [Define .init_array/.fini_array sections are available and working.])
 390 fi])
 391
 392 dnl # _gcc_COMPUTE_GAS_VERSION
 393 dnl # Used by gcc_GAS_VERSION_GTE_IFELSE
 394 dnl #
 395 dnl # WARNING:
 396 dnl # gcc_cv_as_gas_srcdir must be defined before this.
 397 dnl # This gross requirement will go away eventually.
 398 AC_DEFUN([_gcc_COMPUTE_GAS_VERSION],
 399 [gcc_cv_as_bfd_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/bfd
 400 for f in $gcc_cv_as_bfd_srcdir/configure \
 401          $gcc_cv_as_gas_srcdir/configure \
 402          $gcc_cv_as_gas_srcdir/configure.in \
 403          $gcc_cv_as_gas_srcdir/Makefile.in ; do
 404   gcc_cv_gas_version=`sed -n -e 's/^[[  ]]*\(VERSION=[[0-9]]*\.[[0-9]]*.*\)/\1/p' < $f`
 405   if test x$gcc_cv_gas_version != x; then
 406     break
 407   fi
 408 done
 409 gcc_cv_gas_major_version=`expr "$gcc_cv_gas_version" : "VERSION=\([[0-9]]*\)"`
 410 gcc_cv_gas_minor_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.\([[0-9]]*\)"`
 411 gcc_cv_gas_patch_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)"`
 412 case $gcc_cv_gas_patch_version in
 413   "") gcc_cv_gas_patch_version="0" ;;
 414 esac
 415 gcc_cv_gas_vers=`expr \( \( $gcc_cv_gas_major_version \* 1000 \) \
 416                             + $gcc_cv_gas_minor_version \) \* 1000 \
 417                             + $gcc_cv_gas_patch_version`
 418 ]) []dnl # _gcc_COMPUTE_GAS_VERSION
 419
 420 dnl # gcc_GAS_VERSION_GTE_IFELSE([elf,] major, minor, patchlevel,
 421 dnl #                     [command_if_true = :], [command_if_false = :])
 422 dnl # Check to see if the version of GAS is greater than or
 423 dnl # equal to the specified version.
 424 dnl #
 425 dnl # The first ifelse() shortens the shell code if the patchlevel
 426 dnl # is unimportant (the usual case).  The others handle missing
 427 dnl # commands.  Note that the tests are structured so that the most
 428 dnl # common version number cases are tested first.
 429 AC_DEFUN([_gcc_GAS_VERSION_GTE_IFELSE],
 430 [ifelse([$1], elf,
 431  [if test $in_tree_gas_is_elf = yes \
 432   &&],
 433  [if]) test $gcc_cv_gas_vers -ge `expr \( \( $2 \* 1000 \) + $3 \) \* 1000 + $4`
 434   then dnl
 435 ifelse([$5],,:,[$5])[]dnl
 436 ifelse([$6],,,[
 437   else $6])
 438 fi])
 439
 440 AC_DEFUN([gcc_GAS_VERSION_GTE_IFELSE],
 441 [AC_REQUIRE([_gcc_COMPUTE_GAS_VERSION])dnl
 442 ifelse([$1], elf, [_gcc_GAS_VERSION_GTE_IFELSE($@)],
 443                   [_gcc_GAS_VERSION_GTE_IFELSE(,$@)])])
 444
 445 dnl # gcc_GAS_FLAGS
 446 dnl # Used by gcc_GAS_CHECK_FEATURE
 447 dnl #
 448 AC_DEFUN([gcc_GAS_FLAGS],
 449 [AC_CACHE_CHECK([assembler flags], gcc_cv_as_flags,
 450 [ case "$target" in
 451   i[[34567]]86-*-linux*)
 452     dnl Always pass --32 to ia32 Linux assembler.
 453     gcc_cv_as_flags="--32"
 454     ;;
 455   powerpc*-*-darwin*)
 456     dnl Always pass -arch ppc to assembler.
 457     gcc_cv_as_flags="-arch ppc"
 458     ;;
 459   *)
 460     gcc_cv_as_flags=" "
 461     ;;
 462   esac])
 463 ])
 464
 465 dnl gcc_GAS_CHECK_FEATURE(description, cv, [[elf,]major,minor,patchlevel],
 466 dnl [extra switches to as], [assembler input],
 467 dnl [extra testing logic], [command if feature available])
 468 dnl
 469 dnl Checks for an assembler feature.  If we are building an in-tree
 470 dnl gas, the feature is available if the associated assembler version
 471 dnl is greater than or equal to major.minor.patchlevel.  If not, then
 472 dnl ASSEMBLER INPUT is fed to the assembler and the feature is available
 473 dnl if assembly succeeds.  If EXTRA TESTING LOGIC is not the empty string,
 474 dnl then it is run instead of simply setting CV to "yes" - it is responsible
 475 dnl for doing so, if appropriate.
 476 AC_DEFUN([gcc_GAS_CHECK_FEATURE],
 477 [AC_REQUIRE([gcc_GAS_FLAGS])dnl
 478 AC_CACHE_CHECK([assembler for $1], [$2],
 479  [[$2]=no
 480   ifelse([$3],,,[dnl
 481   if test $in_tree_gas = yes; then
 482     gcc_GAS_VERSION_GTE_IFELSE($3, [[$2]=yes])
 483   el])if test x$gcc_cv_as != x; then
 484     echo ifelse(m4_substr([$5],0,1),[$], "[$5]", '[$5]') > conftest.s
 485     if AC_TRY_COMMAND([$gcc_cv_as $gcc_cv_as_flags $4 -o conftest.o conftest.s >&AS_MESSAGE_LOG_FD])
 486     then
 487         ifelse([$6],, [$2]=yes, [$6])
 488     else
 489       echo "configure: failed program was" >&AS_MESSAGE_LOG_FD
 490       cat conftest.s >&AS_MESSAGE_LOG_FD
 491     fi
 492     rm -f conftest.o conftest.s
 493   fi])
 494 ifelse([$7],,,[dnl
 495 if test $[$2] = yes; then
 496   $7
 497 fi])])
 498
 499 dnl GCC_TARGET_TEMPLATE(KEY)
 500 dnl ------------------------
 501 dnl Define KEY as a valid configure key on the target machine.
 502
 503 m4_define([GCC_TARGET_TEMPLATE],
 504 [m4_define([GCC_TARGET_TEMPLATE($1)],[])])
 505
 506 dnl AH_TEMPLATE(KEY, DESCRIPTION)
 507 dnl -----------------------------
 508 dnl Issue an autoheader template for KEY, i.e., a comment composed of
 509 dnl DESCRIPTION (properly wrapped), and then #undef KEY.  Redefinition
 510 dnl of the macro in autoheader.m4, to support definition of only a few
 511 dnl keys while compiling target libraries.
 512
 513 m4_define([AH_TEMPLATE],
 514 [AH_VERBATIM([$1],m4_text_wrap([$2 */], [   ], [/* ])
 515 m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[#ifndef USED_FOR_TARGET
 516 ])[#undef $1]m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[
 517 #endif
 518 ]))])
 519
 520 dnl Make sure that build_exeext is looked for
 521 AC_DEFUN([gcc_AC_BUILD_EXEEXT], [
 522 ac_executable_extensions="$build_exeext"])
 523