1 dnl Copyright (C) 2005, 2006, 2007, 2008, 2011 Free Software Foundation, Inc.
3 dnl This file is part of GCC.
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)
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.
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/>.
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],
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])
35 AC_MSG_RESULT(no) ; ifelse([$3], , :, [$3])
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], [$1],
45 [AH_TEMPLATE(AS_TR_CPP(HAVE_DECL_[]gcc_AC_Func),
46 [Define to 1 if we found a declaration for ']gcc_AC_Func[', otherwise
50 ac_tr_decl=AS_TR_CPP([HAVE_DECL_$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
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,
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
83 gcc_cv_prog_cmp_skip=gnucompare
86 if test $gcc_cv_prog_cmp_skip = slowcompare ; then
87 if cmp t1 t2 2 2 > /dev/null 2>&1; then
88 if cmp t1 t2 1 1 > /dev/null 2>&1; then
91 gcc_cv_prog_cmp_skip=fastcompare
97 make_compare_target=$gcc_cv_prog_cmp_skip
98 AC_SUBST(make_compare_target)
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
107 if ln -s conftestdata_f conftestdata_t 2>/dev/null
109 gcc_cv_prog_LN_S="ln -s"
111 if ln conftestdata_f conftestdata_t 2>/dev/null
115 if cp -p conftestdata_f conftestdata_t 2>/dev/null
117 gcc_cv_prog_LN_S="cp -p"
123 rm -f conftestdata_f conftestdata_t
125 LN_S="$gcc_cv_prog_LN_S"
126 if test "$gcc_cv_prog_LN_S" = "ln -s"; then
129 if test "$gcc_cv_prog_LN_S" = "ln"; then
130 AC_MSG_RESULT([no, using ln])
132 AC_MSG_RESULT([no, and neither does ln, so using $gcc_cv_prog_LN_S])
138 dnl Define MKDIR_TAKES_ONE_ARG if mkdir accepts only one argument instead
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>
152 #endif], [mkdir ("foo", 0);])],
153 gcc_cv_mkdir_takes_one_arg=no, gcc_cv_mkdir_takes_one_arg=yes)])
154 if test $gcc_cv_mkdir_takes_one_arg = yes ; then
155 AC_DEFINE(MKDIR_TAKES_ONE_ARG, 1, [Define if host mkdir takes a single argument.])
159 AC_DEFUN([gcc_AC_PROG_INSTALL],
160 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
161 # Find a good install program. We prefer a C program (faster),
162 # so one script is as good as another. But avoid the broken or
163 # incompatible versions:
164 # SysV /etc/install, /usr/sbin/install
165 # SunOS /usr/etc/install
168 # AFS /usr/afsws/bin/install, which mishandles nonexistent args
169 # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
170 # ./install, which can be erroneously created by make from ./install.sh.
171 AC_MSG_CHECKING(for a BSD compatible install)
172 if test -z "$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.
178 /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;;
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.
189 ac_cv_path_install="$ac_dir/$ac_prog -c"
199 if test "${ac_cv_path_install+set}" = set; then
200 INSTALL="$ac_cv_path_install"
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="$ac_install_sh"
209 dnl We do special magic for INSTALL instead of AC_SUBST, to get
210 dnl relative paths right.
211 AC_MSG_RESULT($INSTALL)
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='${INSTALL}'
217 AC_SUBST(INSTALL_PROGRAM)dnl
219 test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
220 AC_SUBST(INSTALL_DATA)dnl
223 # mmap(2) blacklisting. Some platforms provide the mmap library routine
224 # but don't support all of the features we need from it.
225 AC_DEFUN([gcc_AC_FUNC_MMAP_BLACKLIST],
227 AC_CHECK_HEADER([sys/mman.h],
228 [gcc_header_sys_mman_h=yes], [gcc_header_sys_mman_h=no])
229 AC_CHECK_FUNC([mmap], [gcc_func_mmap=yes], [gcc_func_mmap=no])
230 if test "$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
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.
245 gcc_cv_func_mmap_file=no ;;
247 gcc_cv_func_mmap_file=yes;;
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),
262 vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)
263 gcc_cv_func_mmap_dev_zero=no ;;
265 gcc_cv_func_mmap_dev_zero=yes;;
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>
275 #ifndef MAP_ANONYMOUS
276 #define MAP_ANONYMOUS MAP_ANON
279 [int n = MAP_ANONYMOUS;])],
280 gcc_cv_decl_map_anon=yes,
281 gcc_cv_decl_map_anon=no)])
283 if test $gcc_cv_decl_map_anon = no; then
284 gcc_cv_func_mmap_anon=no
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.
294 vms* | cygwin* | pe | mingw* | sco* | udk* )
295 gcc_cv_func_mmap_anon=no ;;
297 gcc_cv_func_mmap_anon=yes;;
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.])
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.])
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.])
316 dnl Determine if enumerated bitfields are unsigned. ISO C says they can
317 dnl be either signed or unsigned.
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 ;
327 if (s.member < 0) exit(1);
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.])
336 dnl Probe number of bits in a byte.
337 dnl Note C89 requires CHAR_BIT >= 8.
339 AC_DEFUN([gcc_AC_C_CHAR_BIT],
340 [AC_CACHE_CHECK(for CHAR_BIT, gcc_cv_decl_char_bit,
342 [#ifdef HAVE_LIMITS_H
347 #endif], gcc_cv_decl_char_bit=yes, gcc_cv_decl_char_bit=no)
349 if test $gcc_cv_decl_char_bit = no; then
350 AC_CACHE_CHECK(number of bits in a byte, gcc_cv_c_nbby,
353 while test $i -lt 65; do
354 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
356 case (unsigned char)((unsigned long)1 << $i) == ((unsigned long)1 << $i):
357 case (unsigned char)((unsigned long)1<<($i-1)) == ((unsigned long)1<<($i-1)):
359 [gcc_cv_c_nbby=$i; break])
362 test -z "$gcc_cv_c_nbby" && gcc_cv_c_nbby=failed
364 if test $gcc_cv_c_nbby = failed; then
365 AC_MSG_ERROR(cannot determine number of bits in a byte)
367 AC_DEFINE_UNQUOTED(CHAR_BIT, $gcc_cv_c_nbby,
368 [Define as the number of bits in a byte, if `limits.h' doesn't.])
372 AC_DEFUN([gcc_AC_INITFINI_ARRAY],
373 [AC_ARG_ENABLE(initfini-array,
374 [ --enable-initfini-array use .init_array/.fini_array sections],
376 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
377 gcc_cv_initfini_array, [dnl
378 if test "x${build}" = "x${target}" && test "x${build}" = "x${host}"; then
379 AC_RUN_IFELSE([AC_LANG_SOURCE([
384 /* We turn on .preinit_array/.init_array/.fini_array support for ia64
385 if it can be used. */
387 int main (void) { return x; }
388 int foo (void) { x = 0; }
389 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
391 extern void abort ();
401 void (*const init_array1005[]) ()
402 __attribute__ ((section (".init_array.01005"), aligned (sizeof (void *))))
410 void (*const fini_array1005[]) ()
411 __attribute__ ((section (".fini_array.01005"), aligned (sizeof (void *))))
421 void (*const ctors1007[]) ()
422 __attribute__ ((section (".ctors.64528"), aligned (sizeof (void *))))
431 void (*const dtors1007[]) ()
432 __attribute__ ((section (".dtors.64528"), aligned (sizeof (void *))))
442 void (*const init_array65530[]) ()
443 __attribute__ ((section (".init_array.65530"), aligned (sizeof (void *))))
452 void (*const fini_array65530[]) ()
453 __attribute__ ((section (".fini_array.65530"), aligned (sizeof (void *))))
463 void (*const ctors65535[]) ()
464 __attribute__ ((section (".ctors"), aligned (sizeof (void *))))
473 void (*const dtors65535[]) ()
474 __attribute__ ((section (".dtors"), aligned (sizeof (void *))))
486 [gcc_cv_initfini_array=yes], [gcc_cv_initfini_array=no],
487 [gcc_cv_initfini_array=no])
489 AC_MSG_CHECKING(cross compile... guessing)
490 gcc_cv_initfini_array=no
492 enable_initfini_array=$gcc_cv_initfini_array
494 if test $enable_initfini_array = yes; then
495 AC_DEFINE(HAVE_INITFINI_ARRAY, 1,
496 [Define .init_array/.fini_array sections are available and working.])
499 dnl # _gcc_COMPUTE_GAS_VERSION
500 dnl # Used by gcc_GAS_VERSION_GTE_IFELSE
503 dnl # gcc_cv_as_gas_srcdir must be defined before this.
504 dnl # This gross requirement will go away eventually.
505 AC_DEFUN([_gcc_COMPUTE_GAS_VERSION],
506 [gcc_cv_as_bfd_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/bfd
507 for f in $gcc_cv_as_bfd_srcdir/configure \
508 $gcc_cv_as_gas_srcdir/configure \
509 $gcc_cv_as_gas_srcdir/configure.in \
510 $gcc_cv_as_gas_srcdir/Makefile.in ; do
511 gcc_cv_gas_version=`sed -n -e 's/^[[ ]]*\(VERSION=[[0-9]]*\.[[0-9]]*.*\)/\1/p' < $f`
512 if test x$gcc_cv_gas_version != x; then
516 gcc_cv_gas_major_version=`expr "$gcc_cv_gas_version" : "VERSION=\([[0-9]]*\)"`
517 gcc_cv_gas_minor_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.\([[0-9]]*\)"`
518 gcc_cv_gas_patch_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)"`
519 case $gcc_cv_gas_patch_version in
520 "") gcc_cv_gas_patch_version="0" ;;
522 gcc_cv_gas_vers=`expr \( \( $gcc_cv_gas_major_version \* 1000 \) \
523 + $gcc_cv_gas_minor_version \) \* 1000 \
524 + $gcc_cv_gas_patch_version`
525 ]) []dnl # _gcc_COMPUTE_GAS_VERSION
527 dnl # gcc_GAS_VERSION_GTE_IFELSE([elf,] major, minor, patchlevel,
528 dnl # [command_if_true = :], [command_if_false = :])
529 dnl # Check to see if the version of GAS is greater than or
530 dnl # equal to the specified version.
532 dnl # The first ifelse() shortens the shell code if the patchlevel
533 dnl # is unimportant (the usual case). The others handle missing
534 dnl # commands. Note that the tests are structured so that the most
535 dnl # common version number cases are tested first.
536 AC_DEFUN([_gcc_GAS_VERSION_GTE_IFELSE],
538 [if test $in_tree_gas_is_elf = yes \
540 [if]) test $gcc_cv_gas_vers -ge `expr \( \( $2 \* 1000 \) + $3 \) \* 1000 + $4`
542 ifelse([$5],,:,[$5])[]dnl
547 AC_DEFUN([gcc_GAS_VERSION_GTE_IFELSE],
548 [AC_REQUIRE([_gcc_COMPUTE_GAS_VERSION])dnl
549 ifelse([$1], elf, [_gcc_GAS_VERSION_GTE_IFELSE($@)],
550 [_gcc_GAS_VERSION_GTE_IFELSE(,$@)])])
553 dnl # Used by gcc_GAS_CHECK_FEATURE
555 AC_DEFUN([gcc_GAS_FLAGS],
556 [AC_CACHE_CHECK([assembler flags], gcc_cv_as_flags,
558 i[[34567]]86-*-linux*)
559 dnl Always pass --32 to ia32 Linux assembler.
560 gcc_cv_as_flags="--32"
563 dnl Always pass -arch ppc to assembler.
564 gcc_cv_as_flags="-arch ppc"
572 dnl gcc_GAS_CHECK_FEATURE(description, cv, [[elf,]major,minor,patchlevel],
573 dnl [extra switches to as], [assembler input],
574 dnl [extra testing logic], [command if feature available])
576 dnl Checks for an assembler feature. If we are building an in-tree
577 dnl gas, the feature is available if the associated assembler version
578 dnl is greater than or equal to major.minor.patchlevel. If not, then
579 dnl ASSEMBLER INPUT is fed to the assembler and the feature is available
580 dnl if assembly succeeds. If EXTRA TESTING LOGIC is not the empty string,
581 dnl then it is run instead of simply setting CV to "yes" - it is responsible
582 dnl for doing so, if appropriate.
583 AC_DEFUN([gcc_GAS_CHECK_FEATURE],
584 [AC_REQUIRE([gcc_GAS_FLAGS])dnl
585 AC_CACHE_CHECK([assembler for $1], [$2],
588 if test $in_tree_gas = yes; then
589 gcc_GAS_VERSION_GTE_IFELSE($3, [[$2]=yes])
590 el])if test x$gcc_cv_as != x; then
591 AS_ECHO([ifelse(m4_substr([$5],0,1),[$], "[$5]", '[$5]')]) > conftest.s
592 if AC_TRY_COMMAND([$gcc_cv_as $gcc_cv_as_flags $4 -o conftest.o conftest.s >&AS_MESSAGE_LOG_FD])
594 ifelse([$6],, [$2]=yes, [$6])
596 echo "configure: failed program was" >&AS_MESSAGE_LOG_FD
597 cat conftest.s >&AS_MESSAGE_LOG_FD
599 rm -f conftest.o conftest.s
602 if test $[$2] = yes; then
606 dnl GCC_TARGET_TEMPLATE(KEY)
607 dnl ------------------------
608 dnl Define KEY as a valid configure key on the target machine.
610 m4_define([GCC_TARGET_TEMPLATE],
611 [m4_define([GCC_TARGET_TEMPLATE($1)],[])])
613 dnl AH_TEMPLATE(KEY, DESCRIPTION)
614 dnl -----------------------------
615 dnl Issue an autoheader template for KEY, i.e., a comment composed of
616 dnl DESCRIPTION (properly wrapped), and then #undef KEY. Redefinition
617 dnl of the macro in autoheader.m4, to support definition of only a few
618 dnl keys while compiling target libraries.
620 m4_define([AH_TEMPLATE],
621 [AH_VERBATIM([$1],m4_text_wrap([$2 */], [ ], [/* ])
622 m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[#ifndef USED_FOR_TARGET
623 ])[#undef $1]m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[
627 dnl Make sure that build_exeext is looked for
628 AC_DEFUN([gcc_AC_BUILD_EXEEXT], [
629 ac_executable_extensions="$build_exeext"])