1 dnl Copyright (C) 2005, 2006, 2007, 2008, 2011, 2012
2 dnl Free Software Foundation, Inc.
4 dnl This file is part of GCC.
6 dnl GCC 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, or (at your option)
11 dnl GCC 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.
16 dnl You should have received a copy of the GNU General Public License
17 dnl along with GCC; see the file COPYING3. If not see
18 dnl <http://www.gnu.org/licenses/>.
20 dnl See whether we need a declaration for a function.
21 dnl The result is highly dependent on the INCLUDES passed in, so make sure
22 dnl to use a different cache variable name in this macro if it is invoked
23 dnl in a different context somewhere else.
24 dnl gcc_AC_CHECK_DECL(SYMBOL,
25 dnl [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, INCLUDES]]])
26 AC_DEFUN([gcc_AC_CHECK_DECL],
27 [AC_MSG_CHECKING([whether $1 is declared])
28 AC_CACHE_VAL(gcc_cv_have_decl_$1,
29 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4],
31 char *(*pfn) = (char *(*)) $1 ;
32 #endif])], eval "gcc_cv_have_decl_$1=yes", eval "gcc_cv_have_decl_$1=no")])
33 if eval "test \"`echo '$gcc_cv_have_decl_'$1`\" = yes"; then
34 AC_MSG_RESULT(yes) ; ifelse([$2], , :, [$2])
36 AC_MSG_RESULT(no) ; ifelse([$3], , :, [$3])
40 dnl Check multiple functions to see whether each needs a declaration.
41 dnl Arrange to define HAVE_DECL_<FUNCTION> to 0 or 1 as appropriate.
42 dnl gcc_AC_CHECK_DECLS(SYMBOLS,
43 dnl [ACTION-IF-NEEDED [, ACTION-IF-NOT-NEEDED [, INCLUDES]]])
44 AC_DEFUN([gcc_AC_CHECK_DECLS],
45 [AC_FOREACH([gcc_AC_Func], [$1],
46 [AH_TEMPLATE(AS_TR_CPP(HAVE_DECL_[]gcc_AC_Func),
47 [Define to 1 if we found a declaration for ']gcc_AC_Func[', otherwise
51 ac_tr_decl=AS_TR_CPP([HAVE_DECL_$ac_func])
52 gcc_AC_CHECK_DECL($ac_func,
53 [AC_DEFINE_UNQUOTED($ac_tr_decl, 1) $2],
54 [AC_DEFINE_UNQUOTED($ac_tr_decl, 0) $3],
55 dnl It is possible that the include files passed in here are local headers
56 dnl which supply a backup declaration for the relevant prototype based on
57 dnl the definition of (or lack of) the HAVE_DECL_ macro. If so, this test
58 dnl will always return success. E.g. see libiberty.h's handling of
59 dnl `basename'. To avoid this, we define the relevant HAVE_DECL_ macro to
60 dnl 1 so that any local headers used do not provide their own prototype
69 dnl 'make compare' can be significantly faster, if cmp itself can
70 dnl skip bytes instead of using tail. The test being performed is
71 dnl "if cmp --ignore-initial=2 t1 t2 && ! cmp --ignore-initial=1 t1 t2"
72 dnl but we need to sink errors and handle broken shells. We also test
73 dnl for the parameter format "cmp file1 file2 skip1 skip2" which is
74 dnl accepted by cmp on some systems.
75 AC_DEFUN([gcc_AC_PROG_CMP_IGNORE_INITIAL],
76 [AC_CACHE_CHECK([for cmp's capabilities], gcc_cv_prog_cmp_skip,
79 gcc_cv_prog_cmp_skip=slowcompare
80 if cmp --ignore-initial=2 t1 t2 > /dev/null 2>&1; then
81 if cmp --ignore-initial=1 t1 t2 > /dev/null 2>&1; then
84 gcc_cv_prog_cmp_skip=gnucompare
87 if test $gcc_cv_prog_cmp_skip = slowcompare ; then
88 if cmp t1 t2 2 2 > /dev/null 2>&1; then
89 if cmp t1 t2 1 1 > /dev/null 2>&1; then
92 gcc_cv_prog_cmp_skip=fastcompare
98 make_compare_target=$gcc_cv_prog_cmp_skip
99 AC_SUBST(make_compare_target)
102 dnl See if symbolic links work and if not, try to substitute either hard links or simple copy.
103 AC_DEFUN([gcc_AC_PROG_LN_S],
104 [AC_MSG_CHECKING(whether ln -s works)
105 AC_CACHE_VAL(gcc_cv_prog_LN_S,
106 [rm -f conftestdata_t
108 if ln -s conftestdata_f conftestdata_t 2>/dev/null
110 gcc_cv_prog_LN_S="ln -s"
112 if ln conftestdata_f conftestdata_t 2>/dev/null
116 if cp -p conftestdata_f conftestdata_t 2>/dev/null
118 gcc_cv_prog_LN_S="cp -p"
124 rm -f conftestdata_f conftestdata_t
126 LN_S="$gcc_cv_prog_LN_S"
127 if test "$gcc_cv_prog_LN_S" = "ln -s"; then
130 if test "$gcc_cv_prog_LN_S" = "ln"; then
131 AC_MSG_RESULT([no, using ln])
133 AC_MSG_RESULT([no, and neither does ln, so using $gcc_cv_prog_LN_S])
139 dnl Define MKDIR_TAKES_ONE_ARG if mkdir accepts only one argument instead
141 AC_DEFUN([gcc_AC_FUNC_MKDIR_TAKES_ONE_ARG],
142 [AC_CACHE_CHECK([if mkdir takes one argument], gcc_cv_mkdir_takes_one_arg,
143 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
144 #include <sys/types.h>
145 #ifdef HAVE_SYS_STAT_H
146 # include <sys/stat.h>
153 #endif], [mkdir ("foo", 0);])],
154 gcc_cv_mkdir_takes_one_arg=no, gcc_cv_mkdir_takes_one_arg=yes)])
155 if test $gcc_cv_mkdir_takes_one_arg = yes ; then
156 AC_DEFINE(MKDIR_TAKES_ONE_ARG, 1, [Define if host mkdir takes a single argument.])
160 AC_DEFUN([gcc_AC_PROG_INSTALL],
161 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
162 # Find a good install program. We prefer a C program (faster),
163 # so one script is as good as another. But avoid the broken or
164 # incompatible versions:
165 # SysV /etc/install, /usr/sbin/install
166 # SunOS /usr/etc/install
169 # AFS /usr/afsws/bin/install, which mishandles nonexistent args
170 # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
171 # ./install, which can be erroneously created by make from ./install.sh.
172 AC_MSG_CHECKING(for a BSD compatible install)
173 if test -z "$INSTALL"; then
174 AC_CACHE_VAL(ac_cv_path_install,
175 [ IFS="${IFS= }"; ac_save_IFS="$IFS"; IFS="${IFS}:"
176 for ac_dir in $PATH; do
177 # Account for people who put trailing slashes in PATH elements.
179 /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;;
181 # OSF1 and SCO ODT 3.0 have their own names for install.
182 for ac_prog in ginstall scoinst install; do
183 if test -f $ac_dir/$ac_prog; then
184 if test $ac_prog = install &&
185 grep dspmsg $ac_dir/$ac_prog >/dev/null 2>&1; then
186 # AIX install. It has an incompatible calling convention.
187 # OSF/1 installbsd also uses dspmsg, but is usable.
190 ac_cv_path_install="$ac_dir/$ac_prog -c"
200 if test "${ac_cv_path_install+set}" = set; then
201 INSTALL="$ac_cv_path_install"
203 # As a last resort, use the slow shell script. We don't cache a
204 # path for INSTALL within a source directory, because that will
205 # break other packages using the cache if that directory is
206 # removed, or if the path is relative.
207 INSTALL="$ac_install_sh"
210 dnl We do special magic for INSTALL instead of AC_SUBST, to get
211 dnl relative paths right.
212 AC_MSG_RESULT($INSTALL)
215 # Use test -z because SunOS4 sh mishandles braces in ${var-val}.
216 # It thinks the first close brace ends the variable substitution.
217 test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}'
218 AC_SUBST(INSTALL_PROGRAM)dnl
220 test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
221 AC_SUBST(INSTALL_DATA)dnl
224 dnl Determine if enumerated bitfields are unsigned. ISO C says they can
225 dnl be either signed or unsigned.
227 AC_DEFUN([gcc_AC_C_ENUM_BF_UNSIGNED],
228 [AC_CACHE_CHECK(for unsigned enumerated bitfields, gcc_cv_enum_bf_unsigned,
229 [AC_RUN_IFELSE([AC_LANG_SOURCE([#include <stdlib.h>
230 enum t { BLAH = 128 } ;
231 struct s_t { enum t member : 8; } s ;
235 if (s.member < 0) exit(1);
238 }])], gcc_cv_enum_bf_unsigned=yes, gcc_cv_enum_bf_unsigned=no, gcc_cv_enum_bf_unsigned=yes)])
239 if test $gcc_cv_enum_bf_unsigned = yes; then
240 AC_DEFINE(ENUM_BITFIELDS_ARE_UNSIGNED, 1,
241 [Define if enumerated bitfields are treated as unsigned values.])
244 dnl Probe number of bits in a byte.
245 dnl Note C89 requires CHAR_BIT >= 8.
247 AC_DEFUN([gcc_AC_C_CHAR_BIT],
248 [AC_CACHE_CHECK(for CHAR_BIT, gcc_cv_decl_char_bit,
250 [#ifdef HAVE_LIMITS_H
255 #endif], gcc_cv_decl_char_bit=yes, gcc_cv_decl_char_bit=no)
257 if test $gcc_cv_decl_char_bit = no; then
258 AC_CACHE_CHECK(number of bits in a byte, gcc_cv_c_nbby,
261 while test $i -lt 65; do
262 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
264 case (unsigned char)((unsigned long)1 << $i) == ((unsigned long)1 << $i):
265 case (unsigned char)((unsigned long)1<<($i-1)) == ((unsigned long)1<<($i-1)):
267 [gcc_cv_c_nbby=$i; break])
270 test -z "$gcc_cv_c_nbby" && gcc_cv_c_nbby=failed
272 if test $gcc_cv_c_nbby = failed; then
273 AC_MSG_ERROR(cannot determine number of bits in a byte)
275 AC_DEFINE_UNQUOTED(CHAR_BIT, $gcc_cv_c_nbby,
276 [Define as the number of bits in a byte, if `limits.h' doesn't.])
280 AC_DEFUN([gcc_AC_INITFINI_ARRAY],
281 [AC_REQUIRE([gcc_SUN_LD_VERSION])dnl
282 AC_ARG_ENABLE(initfini-array,
283 [ --enable-initfini-array use .init_array/.fini_array sections],
285 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
286 gcc_cv_initfini_array, [dnl
287 if test "x${build}" = "x${target}" && test "x${build}" = "x${host}"; then
290 AC_RUN_IFELSE([AC_LANG_SOURCE([
294 /* We turn on .preinit_array/.init_array/.fini_array support for ia64
295 if it can be used. */
297 int main (void) { return x; }
298 int foo (void) { x = 0; }
299 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
301 [gcc_cv_initfini_array=yes], [gcc_cv_initfini_array=no],
302 [gcc_cv_initfini_array=no]);;
304 gcc_cv_initfini_array=no
305 if test $in_tree_ld = yes ; then
306 if test "$gcc_cv_gld_major_version" -eq 2 \
307 -a "$gcc_cv_gld_minor_version" -ge 22 \
308 -o "$gcc_cv_gld_major_version" -gt 2 \
309 && test $in_tree_ld_is_elf = yes; then
310 gcc_cv_initfini_array=yes
312 elif test x$gcc_cv_as != x -a x$gcc_cv_ld != x -a x$gcc_cv_objdump != x ; then
313 cat > conftest.s <<\EOF
314 .section .dtors,"a",%progbits
316 .byte 'A', 'A', 'A', 'A'
317 .section .ctors,"a",%progbits
319 .byte 'B', 'B', 'B', 'B'
320 .section .fini_array.65530,"a",%progbits
322 .byte 'C', 'C', 'C', 'C'
323 .section .init_array.65530,"a",%progbits
325 .byte 'D', 'D', 'D', 'D'
326 .section .dtors.64528,"a",%progbits
328 .byte 'E', 'E', 'E', 'E'
329 .section .ctors.64528,"a",%progbits
331 .byte 'F', 'F', 'F', 'F'
332 .section .fini_array.01005,"a",%progbits
334 .byte 'G', 'G', 'G', 'G'
335 .section .init_array.01005,"a",%progbits
337 .byte 'H', 'H', 'H', 'H'
342 if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1 \
343 && $gcc_cv_ld -o conftest conftest.o > /dev/null 2>&1 \
344 && $gcc_cv_objdump -s -j .init_array conftest \
345 | grep HHHHFFFFDDDDBBBB > /dev/null 2>&1 \
346 && $gcc_cv_objdump -s -j .fini_array conftest \
347 | grep GGGGEEEECCCCAAAA > /dev/null 2>&1; then
348 gcc_cv_initfini_array=yes
351 rm -f conftest conftest.*
354 AC_PREPROC_IFELSE([AC_LANG_SOURCE([
356 # error Not an ELF OS
359 #if defined __GLIBC_PREREQ
360 # if __GLIBC_PREREQ (2, 4)
362 # error GLIBC 2.4 required
365 # if defined __sun__ && defined __svr4__
366 /* Solaris ld.so.1 supports .init_array/.fini_array since Solaris 8. */
368 # error The C library not known to support .init_array/.fini_array
371 ])],, [gcc_cv_initfini_array=no]);;
374 AC_MSG_CHECKING(cross compile... guessing)
375 gcc_cv_initfini_array=no
377 enable_initfini_array=$gcc_cv_initfini_array
379 if test $enable_initfini_array = yes; then
380 AC_DEFINE(HAVE_INITFINI_ARRAY_SUPPORT, 1,
381 [Define .init_array/.fini_array sections are available and working.])
384 dnl # _gcc_COMPUTE_GAS_VERSION
385 dnl # Used by gcc_GAS_VERSION_GTE_IFELSE
388 dnl # gcc_cv_as_gas_srcdir must be defined before this.
389 dnl # This gross requirement will go away eventually.
390 AC_DEFUN([_gcc_COMPUTE_GAS_VERSION],
391 [gcc_cv_as_bfd_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/bfd
392 for f in $gcc_cv_as_bfd_srcdir/configure \
393 $gcc_cv_as_gas_srcdir/configure \
394 $gcc_cv_as_gas_srcdir/configure.in \
395 $gcc_cv_as_gas_srcdir/Makefile.in ; do
396 gcc_cv_gas_version=`sed -n -e 's/^[[ ]]*VERSION=[[^0-9A-Za-z_]]*\([[0-9]]*\.[[0-9]]*.*\)/VERSION=\1/p' < $f`
397 if test x$gcc_cv_gas_version != x; then
401 case $gcc_cv_gas_version in
403 *) AC_MSG_ERROR([[cannot find version of in-tree assembler]]);;
405 gcc_cv_gas_major_version=`expr "$gcc_cv_gas_version" : "VERSION=\([[0-9]]*\)"`
406 gcc_cv_gas_minor_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.\([[0-9]]*\)"`
407 gcc_cv_gas_patch_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)"`
408 case $gcc_cv_gas_patch_version in
409 "") gcc_cv_gas_patch_version="0" ;;
411 gcc_cv_gas_vers=`expr \( \( $gcc_cv_gas_major_version \* 1000 \) \
412 + $gcc_cv_gas_minor_version \) \* 1000 \
413 + $gcc_cv_gas_patch_version`
414 ]) []dnl # _gcc_COMPUTE_GAS_VERSION
416 dnl # gcc_GAS_VERSION_GTE_IFELSE([elf,] major, minor, patchlevel,
417 dnl # [command_if_true = :], [command_if_false = :])
418 dnl # Check to see if the version of GAS is greater than or
419 dnl # equal to the specified version.
421 dnl # The first ifelse() shortens the shell code if the patchlevel
422 dnl # is unimportant (the usual case). The others handle missing
423 dnl # commands. Note that the tests are structured so that the most
424 dnl # common version number cases are tested first.
425 AC_DEFUN([_gcc_GAS_VERSION_GTE_IFELSE],
427 [if test $in_tree_gas_is_elf = yes \
429 [if]) test $gcc_cv_gas_vers -ge `expr \( \( $2 \* 1000 \) + $3 \) \* 1000 + $4`
431 ifelse([$5],,:,[$5])[]dnl
436 AC_DEFUN([gcc_GAS_VERSION_GTE_IFELSE],
437 [AC_REQUIRE([_gcc_COMPUTE_GAS_VERSION])dnl
438 ifelse([$1], elf, [_gcc_GAS_VERSION_GTE_IFELSE($@)],
439 [_gcc_GAS_VERSION_GTE_IFELSE(,$@)])])
442 dnl # Used by gcc_GAS_CHECK_FEATURE
444 AC_DEFUN([gcc_GAS_FLAGS],
445 [AC_CACHE_CHECK([assembler flags], gcc_cv_as_flags,
447 i[[34567]]86-*-linux*)
448 dnl Always pass --32 to ia32 Linux assembler.
449 gcc_cv_as_flags="--32"
452 dnl Always pass -arch ppc to assembler.
453 gcc_cv_as_flags="-arch ppc"
461 dnl gcc_GAS_CHECK_FEATURE(description, cv, [[elf,]major,minor,patchlevel],
462 dnl [extra switches to as], [assembler input],
463 dnl [extra testing logic], [command if feature available])
465 dnl Checks for an assembler feature. If we are building an in-tree
466 dnl gas, the feature is available if the associated assembler version
467 dnl is greater than or equal to major.minor.patchlevel. If not, then
468 dnl ASSEMBLER INPUT is fed to the assembler and the feature is available
469 dnl if assembly succeeds. If EXTRA TESTING LOGIC is not the empty string,
470 dnl then it is run instead of simply setting CV to "yes" - it is responsible
471 dnl for doing so, if appropriate.
472 AC_DEFUN([gcc_GAS_CHECK_FEATURE],
473 [AC_REQUIRE([gcc_GAS_FLAGS])dnl
474 AC_CACHE_CHECK([assembler for $1], [$2],
477 if test $in_tree_gas = yes; then
478 gcc_GAS_VERSION_GTE_IFELSE($3, [[$2]=yes])
479 el])if test x$gcc_cv_as != x; then
480 AS_ECHO([ifelse(m4_substr([$5],0,1),[$], "[$5]", '[$5]')]) > conftest.s
481 if AC_TRY_COMMAND([$gcc_cv_as $gcc_cv_as_flags $4 -o conftest.o conftest.s >&AS_MESSAGE_LOG_FD])
483 ifelse([$6],, [$2]=yes, [$6])
485 echo "configure: failed program was" >&AS_MESSAGE_LOG_FD
486 cat conftest.s >&AS_MESSAGE_LOG_FD
488 rm -f conftest.o conftest.s
491 if test $[$2] = yes; then
495 dnl gcc_SUN_LD_VERSION
497 dnl Determines Sun linker version numbers, setting gcc_cv_sun_ld_vers to
498 dnl the complete version number and gcc_cv_sun_ld_vers_{major, minor} to
499 dnl the corresponding fields.
501 dnl ld and ld.so.1 are guaranteed to be updated in lockstep, so ld version
502 dnl numbers can be used in ld.so.1 feature checks even if a different
503 dnl linker is configured.
505 AC_DEFUN([gcc_SUN_LD_VERSION],
507 if test "x${build}" = "x${target}" && test "x${build}" = "x${host}"; then
511 # Solaris 2 ld -V output looks like this for a regular version:
513 # ld: Software Generation Utilities - Solaris Link Editors: 5.11-1.1699
515 # but test versions add stuff at the end:
517 # ld: Software Generation Utilities - Solaris Link Editors: 5.11-1.1701:onnv-ab196087-6931056-03/25/10
519 gcc_cv_sun_ld_ver=`/usr/ccs/bin/ld -V 2>&1`
520 if echo "$gcc_cv_sun_ld_ver" | grep 'Solaris Link Editors' > /dev/null; then
521 gcc_cv_sun_ld_vers=`echo $gcc_cv_sun_ld_ver | sed -n \
522 -e 's,^.*: 5\.[0-9][0-9]*-\([0-9]\.[0-9][0-9]*\).*$,\1,p'`
523 gcc_cv_sun_ld_vers_major=`expr "$gcc_cv_sun_ld_vers" : '\([0-9]*\)'`
524 gcc_cv_sun_ld_vers_minor=`expr "$gcc_cv_sun_ld_vers" : '[0-9]*\.\([0-9]*\)'`
532 dnl GCC_TARGET_TEMPLATE(KEY)
533 dnl ------------------------
534 dnl Define KEY as a valid configure key on the target machine.
536 m4_define([GCC_TARGET_TEMPLATE],
537 [m4_define([GCC_TARGET_TEMPLATE($1)],[])])
539 dnl AH_TEMPLATE(KEY, DESCRIPTION)
540 dnl -----------------------------
541 dnl Issue an autoheader template for KEY, i.e., a comment composed of
542 dnl DESCRIPTION (properly wrapped), and then #undef KEY. Redefinition
543 dnl of the macro in autoheader.m4, to support definition of only a few
544 dnl keys while compiling target libraries.
546 m4_define([AH_TEMPLATE],
547 [AH_VERBATIM([$1],m4_text_wrap([$2 */], [ ], [/* ])
548 m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[#ifndef USED_FOR_TARGET
549 ])[#undef $1]m4_ifdef([GCC_TARGET_TEMPLATE($1)],[],[
553 dnl Make sure that build_exeext is looked for
554 AC_DEFUN([gcc_AC_BUILD_EXEEXT], [
555 ac_executable_extensions="$build_exeext"])