1 dnl ----------------------------------------------------------------------
2 dnl This whole bit snagged from libgfortran.
4 dnl Check whether the target supports __sync_*_compare_and_swap.
5 AC_DEFUN([LIBITM_CHECK_SYNC_BUILTINS], [
6 AC_CACHE_CHECK([whether the target supports __sync_*_compare_and_swap],
7 libitm_cv_have_sync_builtins, [
8 AC_TRY_LINK([], [int foo, bar; bar = __sync_val_compare_and_swap(&foo, 0, 1);],
9 libitm_cv_have_sync_builtins=yes, libitm_cv_have_sync_builtins=no)])
10 if test $libitm_cv_have_sync_builtins = yes; then
11 AC_DEFINE(HAVE_SYNC_BUILTINS, 1,
12 [Define to 1 if the target supports __sync_*_compare_and_swap])
15 dnl Check whether the target supports 64-bit __sync_*_compare_and_swap.
16 AC_DEFUN([LIBITM_CHECK_64BIT_SYNC_BUILTINS], [
17 AC_CACHE_CHECK([whether the target supports 64-bit __sync_*_compare_and_swap],
18 libitm_cv_have_64bit_sync_builtins, [
19 AC_TRY_LINK([#include <stdint.h>],
21 bar = __sync_val_compare_and_swap(&foo, 0, 1);],
22 libitm_cv_have_64bit_sync_builtins=yes,
23 libitm_cv_have_64bit_sync_builtins=no)])
24 if test $libitm_cv_have_64bit_sync_builtins = yes; then
25 AC_DEFINE(HAVE_64BIT_SYNC_BUILTINS, 1,
26 [Define to 1 if the target supports 64-bit __sync_*_compare_and_swap])
29 dnl Check whether the target supports hidden visibility.
30 AC_DEFUN([LIBITM_CHECK_ATTRIBUTE_VISIBILITY], [
31 AC_CACHE_CHECK([whether the target supports hidden visibility],
32 libitm_cv_have_attribute_visibility, [
34 CFLAGS="$CFLAGS -Werror"
35 AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
36 [], libitm_cv_have_attribute_visibility=yes,
37 libitm_cv_have_attribute_visibility=no)
38 CFLAGS="$save_CFLAGS"])
39 if test $libitm_cv_have_attribute_visibility = yes; then
40 AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
41 [Define to 1 if the target supports __attribute__((visibility(...))).])
44 dnl Check whether the target supports dllexport
45 AC_DEFUN([LIBITM_CHECK_ATTRIBUTE_DLLEXPORT], [
46 AC_CACHE_CHECK([whether the target supports dllexport],
47 libitm_cv_have_attribute_dllexport, [
49 CFLAGS="$CFLAGS -Werror"
50 AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }],
51 [], libitm_cv_have_attribute_dllexport=yes,
52 libitm_cv_have_attribute_dllexport=no)
53 CFLAGS="$save_CFLAGS"])
54 if test $libitm_cv_have_attribute_dllexport = yes; then
55 AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,
56 [Define to 1 if the target supports __attribute__((dllexport)).])
59 dnl Check whether the target supports symbol aliases.
60 AC_DEFUN([LIBITM_CHECK_ATTRIBUTE_ALIAS], [
61 AC_CACHE_CHECK([whether the target supports symbol aliases],
62 libitm_cv_have_attribute_alias, [
65 extern void bar(void) __attribute__((alias("foo")));],
66 [bar();], libitm_cv_have_attribute_alias=yes, libitm_cv_have_attribute_alias=no)])
67 if test $libitm_cv_have_attribute_alias = yes; then
68 AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
69 [Define to 1 if the target supports __attribute__((alias(...))).])
72 dnl Check how size_t is mangled.
73 AC_DEFUN([LIBITM_CHECK_SIZE_T_MANGLING], [
74 AC_CACHE_CHECK([how size_t is mangled],
75 libitm_cv_size_t_mangling, [
76 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned long x;],
77 [libitm_cv_size_t_mangling=m], [
78 AC_TRY_COMPILE([], [extern __SIZE_TYPE__ x; extern unsigned int x;],
79 [libitm_cv_size_t_mangling=j], [
81 [extern __SIZE_TYPE__ x; extern unsigned long long x;],
82 [libitm_cv_size_t_mangling=y], [
84 [extern __SIZE_TYPE__ x; extern unsigned short x;],
85 [libitm_cv_size_t_mangling=t],
86 [libitm_cv_size_t_mangling=x])
91 if test $libitm_cv_size_t_mangling = x; then
92 AC_MSG_ERROR([Unknown underlying type for size_t])
94 AC_DEFINE_UNQUOTED(MANGLE_SIZE_T, [$libitm_cv_size_t_mangling],
95 [Define to the letter to which size_t is mangled.])
98 dnl Check if as supports AVX instructions.
99 AC_DEFUN([LIBITM_CHECK_AS_AVX], [
100 case "${target_cpu}" in
101 i[[34567]]86 | x86_64)
102 AC_CACHE_CHECK([if the assembler supports AVX], libitm_cv_as_avx, [
103 AC_TRY_COMPILE([], [asm("vzeroupper");],
104 [libitm_cv_as_avx=yes], [libitm_cv_as_avx=no])
106 if test x$libitm_cv_as_avx = xyes; then
107 AC_DEFINE(HAVE_AS_AVX, 1, [Define to 1 if the assembler supports AVX.])
112 dnl Check if as supports RTM instructions.
113 AC_DEFUN([LIBITM_CHECK_AS_RTM], [
114 case "${target_cpu}" in
115 i[[34567]]86 | x86_64)
116 AC_CACHE_CHECK([if the assembler supports RTM], libitm_cv_as_rtm, [
117 AC_TRY_COMPILE([], [asm("1: xbegin 1b; xend");],
118 [libitm_cv_as_rtm=yes], [libitm_cv_as_rtm=no])
120 if test x$libitm_cv_as_rtm = xyes; then
121 AC_DEFINE(HAVE_AS_RTM, 1, [Define to 1 if the assembler supports RTM.])
126 dnl Check if as supports HTM instructions.
127 AC_DEFUN([LIBITM_CHECK_AS_HTM], [
128 case "${target_cpu}" in
130 AC_CACHE_CHECK([if the assembler supports HTM], libitm_cv_as_htm, [
131 AC_TRY_COMPILE([], [asm("tbegin. 0; tend. 0");],
132 [libitm_cv_as_htm=yes], [libitm_cv_as_htm=no])
134 if test x$libitm_cv_as_htm = xyes; then
135 AC_DEFINE(HAVE_AS_HTM, 1, [Define to 1 if the assembler supports HTM.])
139 AC_CACHE_CHECK([if the assembler supports HTM], libitm_cv_as_htm, [
140 save_CFLAGS="$CFLAGS"
141 CFLAGS="$CFLAGS -march=zEC12"
142 AC_TRY_COMPILE([], [asm("tbegin 0,0; tend");],
143 [libitm_cv_as_htm=yes], [libitm_cv_as_htm=no])
144 CFLAGS="$save_CFLAGS"])
145 if test x$libitm_cv_as_htm = xyes; then
146 AC_DEFINE(HAVE_AS_HTM, 1, [Define to 1 if the assembler supports HTM.])
151 sinclude(../libtool.m4)
152 sinclude(../config/cet.m4)
153 dnl The lines below arrange for aclocal not to bring an installed
154 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
155 dnl add a definition of LIBTOOL to Makefile.in.
156 ifelse(,,,[AC_SUBST(LIBTOOL)
157 AC_DEFUN([AM_PROG_LIBTOOL])
158 AC_DEFUN([AC_LIBTOOL_DLOPEN])
159 AC_DEFUN([AC_PROG_LD])
162 dnl ----------------------------------------------------------------------
163 dnl This whole bit snagged from libstdc++-v3.
167 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
168 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
169 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
171 dnl See docs/html/17_intro/configury.html#enable for documentation.
173 m4_define([LIBITM_ENABLE],[dnl
174 m4_define([_g_switch],[--enable-$1])dnl
175 m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
176 AC_ARG_ENABLE($1,_g_help,
181 m4_bpatsubst([$5],[permit ])) ;;
182 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
183 dnl Idea for future: generate a URL pointing to
184 dnl "onlinedocs/configopts.html#whatever"
191 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
195 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
196 m4_undefine([_g_switch])dnl
197 m4_undefine([_g_help])dnl
202 dnl If GNU ld is in use, check to see if tricky linker opts can be used. If
203 dnl the native linker is in use, all variables will be defined to something
204 dnl safe (like an empty string).
207 dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible
208 dnl OPT_LDFLAGS='-Wl,-O1' if possible
209 dnl LD (as a side effect of testing)
212 dnl libitm_ld_is_gold (possibly)
213 dnl libitm_gnu_ld_version (possibly)
215 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
216 dnl set libitm_gnu_ld_version to 12345. Zeros cause problems.
218 AC_DEFUN([LIBITM_CHECK_LINKER_FEATURES], [
219 # If we're not using GNU ld, then there's no point in even trying these
220 # tests. Check for that first. We should have already tested for gld
221 # by now (in libtool), but require it now just to be safe...
222 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
223 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
224 AC_REQUIRE([AC_PROG_LD])
225 AC_REQUIRE([AC_PROG_AWK])
227 # The name set by libtool depends on the version of libtool. Shame on us
228 # for depending on an impl detail, but c'est la vie. Older versions used
229 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
230 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
231 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
232 # set (hence we're using an older libtool), then set it.
233 if test x${with_gnu_ld+set} != xset; then
234 if test x${ac_cv_prog_gnu_ld+set} != xset; then
235 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
238 with_gnu_ld=$ac_cv_prog_gnu_ld
242 # Start by getting the version number. I think the libtool test already
243 # does some of this, but throws away the result.
245 if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
246 libitm_ld_is_gold=yes
249 ldver=`$LD --version 2>/dev/null |
250 sed -e 's/GNU gold /GNU ld /;s/GNU ld version /GNU ld /;s/GNU ld ([^)]*) /GNU ld /;s/GNU ld \([0-9.][0-9.]*\).*/\1/; q'`
252 libitm_gnu_ld_version=`echo $ldver | \
253 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
256 if test "$with_gnu_ld" = "notbroken"; then
257 # GNU ld it is! Joy and bunny rabbits!
259 # All these tests are for C++; save the language and the compiler flags.
260 # Need to do this so that g++ won't try to link in libstdc++
261 ac_test_CFLAGS="${CFLAGS+set}"
262 ac_save_CFLAGS="$CFLAGS"
263 CFLAGS='-x c++ -Wl,--gc-sections'
265 # Check for -Wl,--gc-sections
266 # XXX This test is broken at the moment, as symbols required for linking
267 # are now in libsupc++ (not built yet). In addition, this test has
268 # cored on solaris in the past. In addition, --gc-sections doesn't
269 # really work at the moment (keeps on discarding used sections, first
270 # .eh_frame and now some of the glibc sections for iconv).
271 # Bzzzzt. Thanks for playing, maybe next time.
272 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
280 ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
281 if test "$ac_test_CFLAGS" = set; then
282 CFLAGS="$ac_save_CFLAGS"
284 # this is the suspicious part
287 if test "$ac_sectionLDflags" = "yes"; then
288 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
290 AC_MSG_RESULT($ac_sectionLDflags)
293 # Set linker optimization flags.
294 if test x"$with_gnu_ld" = x"yes"; then
295 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
298 AC_SUBST(SECTION_LDFLAGS)
299 AC_SUBST(OPT_LDFLAGS)
304 dnl Add version tags to symbols in shared library (or not), additionally
305 dnl marking other symbols as private/local (or not).
307 dnl --enable-symvers=style adds a version script to the linker call when
308 dnl creating the shared library. The choice of version script is
309 dnl controlled by 'style'.
310 dnl --disable-symvers does not.
311 dnl + Usage: LIBITM_ENABLE_SYMVERS[(DEFAULT)]
312 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
313 dnl choose a default style based on linker characteristics. Passing
314 dnl 'no' disables versioning.
316 AC_DEFUN([LIBITM_ENABLE_SYMVERS], [
318 LIBITM_ENABLE(symvers,yes,[=STYLE],
319 [enables symbol versioning of the shared library],
320 [permit yes|no|gnu*|sun])
322 # If we never went through the LIBITM_CHECK_LINKER_FEATURES macro, then we
323 # don't know enough about $LD to do tricks...
324 AC_REQUIRE([LIBITM_CHECK_LINKER_FEATURES])
326 # Turn a 'yes' into a suitable default.
327 if test x$enable_symvers = xyes ; then
328 # FIXME The following test is too strict, in theory.
329 if test $enable_shared = no || test "x$LD" = x; then
332 if test $with_gnu_ld = yes ; then
336 # Sun symbol versioning exists since Solaris 2.5.
337 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
338 enable_symvers=sun ;;
346 # Check if 'sun' was requested on non-Solaris 2 platforms.
347 if test x$enable_symvers = xsun ; then
354 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
355 AC_MSG_WARN([=== you are not targetting Solaris 2.])
356 AC_MSG_WARN([=== Symbol versioning will be disabled.])
362 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
363 if test $enable_symvers != no; then
364 AC_MSG_CHECKING([for shared libgcc])
365 ac_save_CFLAGS="$CFLAGS"
367 AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes, libitm_shared_libgcc=no)
368 CFLAGS="$ac_save_CFLAGS"
369 if test $libitm_shared_libgcc = no; then
370 cat > conftest.c <<EOF
371 int main (void) { return 0; }
374 libitm_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
375 -shared -shared-libgcc -o conftest.so \
376 conftest.c -v 2>&1 >/dev/null \
377 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
379 rm -f conftest.c conftest.so
380 if test x${libitm_libgcc_s_suffix+set} = xset; then
381 CFLAGS=" -lgcc_s$libitm_libgcc_s_suffix"
382 AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes)
383 CFLAGS="$ac_save_CFLAGS"
386 AC_MSG_RESULT($libitm_shared_libgcc)
389 # For GNU ld, we need at least this version. The format is described in
390 # LIBITM_CHECK_LINKER_FEATURES above.
391 libitm_min_gnu_ld_version=21400
392 # XXXXXXXXXXX libitm_gnu_ld_version=21390
394 # Check to see if unspecified "yes" value can win, given results above.
395 # Change "yes" into either "no" or a style name.
396 if test $enable_symvers != no && test $libitm_shared_libgcc = yes; then
397 if test $with_gnu_ld = yes; then
398 if test $libitm_gnu_ld_version -ge $libitm_min_gnu_ld_version ; then
400 elif test $libitm_ld_is_gold = yes ; then
403 # The right tools, the right setup, but too old. Fallbacks?
404 AC_MSG_WARN(=== Linker version $libitm_gnu_ld_version is too old for)
405 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
406 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
407 AC_MSG_WARN(=== $libitm_min_gnu_ld_version or later and rebuild GCC.)
408 if test $libitm_gnu_ld_version -ge 21200 ; then
409 # Globbing fix is present, proper block support is not.
410 dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.])
411 dnl enable_symvers=???
412 AC_MSG_WARN([=== Symbol versioning will be disabled.])
416 AC_MSG_WARN([=== Symbol versioning will be disabled.])
420 elif test $enable_symvers = sun; then
421 : All interesting versions of Sun ld support sun style symbol versioning.
424 AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])
425 AC_MSG_WARN([=== either you are not using a supported linker, or you are])
426 AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])
427 AC_MSG_WARN([=== Symbol versioning will be disabled.])
432 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)
433 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu)
434 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun)
435 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)