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 dnl The lines below arrange for aclocal not to bring an installed
153 dnl libtool.m4 into aclocal.m4, while still arranging for automake to
154 dnl add a definition of LIBTOOL to Makefile.in.
155 ifelse(,,,[AC_SUBST(LIBTOOL)
156 AC_DEFUN([AM_PROG_LIBTOOL])
157 AC_DEFUN([AC_LIBTOOL_DLOPEN])
158 AC_DEFUN([AC_PROG_LD])
161 dnl ----------------------------------------------------------------------
162 dnl This whole bit snagged from libstdc++-v3.
166 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
167 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
168 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
170 dnl See docs/html/17_intro/configury.html#enable for documentation.
172 m4_define([LIBITM_ENABLE],[dnl
173 m4_define([_g_switch],[--enable-$1])dnl
174 m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
175 AC_ARG_ENABLE($1,_g_help,
180 m4_bpatsubst([$5],[permit ])) ;;
181 *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
182 dnl Idea for future: generate a URL pointing to
183 dnl "onlinedocs/configopts.html#whatever"
190 *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
194 [enable_]m4_bpatsubst([$1],-,_)[=][$2])
195 m4_undefine([_g_switch])dnl
196 m4_undefine([_g_help])dnl
201 dnl If GNU ld is in use, check to see if tricky linker opts can be used. If
202 dnl the native linker is in use, all variables will be defined to something
203 dnl safe (like an empty string).
206 dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible
207 dnl OPT_LDFLAGS='-Wl,-O1' if possible
208 dnl LD (as a side effect of testing)
211 dnl libitm_ld_is_gold (possibly)
212 dnl libitm_gnu_ld_version (possibly)
214 dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
215 dnl set libitm_gnu_ld_version to 12345. Zeros cause problems.
217 AC_DEFUN([LIBITM_CHECK_LINKER_FEATURES], [
218 # If we're not using GNU ld, then there's no point in even trying these
219 # tests. Check for that first. We should have already tested for gld
220 # by now (in libtool), but require it now just to be safe...
221 test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
222 test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
223 AC_REQUIRE([AC_PROG_LD])
224 AC_REQUIRE([AC_PROG_AWK])
226 # The name set by libtool depends on the version of libtool. Shame on us
227 # for depending on an impl detail, but c'est la vie. Older versions used
228 # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
229 # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
230 # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't
231 # set (hence we're using an older libtool), then set it.
232 if test x${with_gnu_ld+set} != xset; then
233 if test x${ac_cv_prog_gnu_ld+set} != xset; then
234 # We got through "ac_require(ac_prog_ld)" and still not set? Huh?
237 with_gnu_ld=$ac_cv_prog_gnu_ld
241 # Start by getting the version number. I think the libtool test already
242 # does some of this, but throws away the result.
244 if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
245 libitm_ld_is_gold=yes
248 ldver=`$LD --version 2>/dev/null |
249 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'`
251 libitm_gnu_ld_version=`echo $ldver | \
252 $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
255 if test "$with_gnu_ld" = "notbroken"; then
256 # GNU ld it is! Joy and bunny rabbits!
258 # All these tests are for C++; save the language and the compiler flags.
259 # Need to do this so that g++ won't try to link in libstdc++
260 ac_test_CFLAGS="${CFLAGS+set}"
261 ac_save_CFLAGS="$CFLAGS"
262 CFLAGS='-x c++ -Wl,--gc-sections'
264 # Check for -Wl,--gc-sections
265 # XXX This test is broken at the moment, as symbols required for linking
266 # are now in libsupc++ (not built yet). In addition, this test has
267 # cored on solaris in the past. In addition, --gc-sections doesn't
268 # really work at the moment (keeps on discarding used sections, first
269 # .eh_frame and now some of the glibc sections for iconv).
270 # Bzzzzt. Thanks for playing, maybe next time.
271 AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
279 ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
280 if test "$ac_test_CFLAGS" = set; then
281 CFLAGS="$ac_save_CFLAGS"
283 # this is the suspicious part
286 if test "$ac_sectionLDflags" = "yes"; then
287 SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
289 AC_MSG_RESULT($ac_sectionLDflags)
292 # Set linker optimization flags.
293 if test x"$with_gnu_ld" = x"yes"; then
294 OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
297 AC_SUBST(SECTION_LDFLAGS)
298 AC_SUBST(OPT_LDFLAGS)
303 dnl Add version tags to symbols in shared library (or not), additionally
304 dnl marking other symbols as private/local (or not).
306 dnl --enable-symvers=style adds a version script to the linker call when
307 dnl creating the shared library. The choice of version script is
308 dnl controlled by 'style'.
309 dnl --disable-symvers does not.
310 dnl + Usage: LIBITM_ENABLE_SYMVERS[(DEFAULT)]
311 dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to
312 dnl choose a default style based on linker characteristics. Passing
313 dnl 'no' disables versioning.
315 AC_DEFUN([LIBITM_ENABLE_SYMVERS], [
317 LIBITM_ENABLE(symvers,yes,[=STYLE],
318 [enables symbol versioning of the shared library],
319 [permit yes|no|gnu*|sun])
321 # If we never went through the LIBITM_CHECK_LINKER_FEATURES macro, then we
322 # don't know enough about $LD to do tricks...
323 AC_REQUIRE([LIBITM_CHECK_LINKER_FEATURES])
325 # Turn a 'yes' into a suitable default.
326 if test x$enable_symvers = xyes ; then
327 # FIXME The following test is too strict, in theory.
328 if test $enable_shared = no || test "x$LD" = x; then
331 if test $with_gnu_ld = yes ; then
335 # Sun symbol versioning exists since Solaris 2.5.
336 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
337 enable_symvers=sun ;;
345 # Check if 'sun' was requested on non-Solaris 2 platforms.
346 if test x$enable_symvers = xsun ; then
353 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
354 AC_MSG_WARN([=== you are not targetting Solaris 2.])
355 AC_MSG_WARN([=== Symbol versioning will be disabled.])
361 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
362 if test $enable_symvers != no; then
363 AC_MSG_CHECKING([for shared libgcc])
364 ac_save_CFLAGS="$CFLAGS"
366 AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes, libitm_shared_libgcc=no)
367 CFLAGS="$ac_save_CFLAGS"
368 if test $libitm_shared_libgcc = no; then
369 cat > conftest.c <<EOF
370 int main (void) { return 0; }
373 libitm_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
374 -shared -shared-libgcc -o conftest.so \
375 conftest.c -v 2>&1 >/dev/null \
376 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
378 rm -f conftest.c conftest.so
379 if test x${libitm_libgcc_s_suffix+set} = xset; then
380 CFLAGS=" -lgcc_s$libitm_libgcc_s_suffix"
381 AC_TRY_LINK(, [return 0;], libitm_shared_libgcc=yes)
382 CFLAGS="$ac_save_CFLAGS"
385 AC_MSG_RESULT($libitm_shared_libgcc)
388 # For GNU ld, we need at least this version. The format is described in
389 # LIBITM_CHECK_LINKER_FEATURES above.
390 libitm_min_gnu_ld_version=21400
391 # XXXXXXXXXXX libitm_gnu_ld_version=21390
393 # Check to see if unspecified "yes" value can win, given results above.
394 # Change "yes" into either "no" or a style name.
395 if test $enable_symvers != no && test $libitm_shared_libgcc = yes; then
396 if test $with_gnu_ld = yes; then
397 if test $libitm_gnu_ld_version -ge $libitm_min_gnu_ld_version ; then
399 elif test $libitm_ld_is_gold = yes ; then
402 # The right tools, the right setup, but too old. Fallbacks?
403 AC_MSG_WARN(=== Linker version $libitm_gnu_ld_version is too old for)
404 AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
405 AC_MSG_WARN(=== You would need to upgrade your binutils to version)
406 AC_MSG_WARN(=== $libitm_min_gnu_ld_version or later and rebuild GCC.)
407 if test $libitm_gnu_ld_version -ge 21200 ; then
408 # Globbing fix is present, proper block support is not.
409 dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.])
410 dnl enable_symvers=???
411 AC_MSG_WARN([=== Symbol versioning will be disabled.])
415 AC_MSG_WARN([=== Symbol versioning will be disabled.])
419 elif test $enable_symvers = sun; then
420 : All interesting versions of Sun ld support sun style symbol versioning.
423 AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])
424 AC_MSG_WARN([=== either you are not using a supported linker, or you are])
425 AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])
426 AC_MSG_WARN([=== Symbol versioning will be disabled.])
431 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)
432 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu)
433 AM_CONDITIONAL(LIBITM_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun)
434 AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)