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Commit | Line | Data |
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6db1d2ca | 1 | dnl |
2 | dnl Unconditionally define a preprocessor macro, translating the shell | |
3 | dnl macro from yes/no to 1/0. | |
4 | dnl | |
5 | AC_DEFUN([LIBAT_DEFINE_YESNO], [ | |
6 | yesno=`echo $2 | tr 'yesno' '1 0 '` | |
7 | AC_DEFINE_UNQUOTED([$1], $yesno, [$3]) | |
8 | ]) | |
9 | dnl | |
10 | dnl Iterate over all of the modes we're prepared to check. | |
11 | dnl | |
12 | AC_DEFUN([LIBAT_FORALL_MODES], | |
13 | [$1(QI,1) | |
14 | $1(HI,2) | |
15 | $1(SI,4) | |
16 | $1(DI,8) | |
17 | $1(TI,16)] | |
18 | ) | |
19 | dnl | |
20 | dnl Check for builtin types by mode. | |
21 | dnl | |
22 | dnl A less interesting of size checking than autoconf normally provides. | |
23 | dnl We know that gcc always provides <stdint.h>, but we don't often | |
24 | dnl provide a builtin type for TImode. | |
25 | dnl | |
26 | AC_DEFUN([LIBAT_HAVE_INT_MODE],[ | |
27 | AC_CACHE_CHECK([for $2 byte integer],[libat_cv_have_mode_$1], | |
f00f02a3 | 28 | [AC_COMPILE_IFELSE([AC_LANG_SOURCE([int x __attribute__((mode($1)));])], |
6db1d2ca | 29 | [libat_cv_have_mode_$1=yes],[libat_cv_have_mode_$1=no])]) |
30 | LIBAT_DEFINE_YESNO([HAVE_INT$2], [$libat_cv_have_mode_$1], | |
31 | [Have support for $2 byte integers.]) | |
32 | if test x$libat_cv_have_mode_$1 = xyes; then | |
33 | SIZES="$SIZES $2" | |
34 | fi | |
35 | ]) | |
36 | dnl | |
37 | dnl Check for atomic builtins. | |
38 | dnl See: | |
39 | dnl http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html | |
40 | dnl | |
41 | dnl This checks to see if the host supports the compiler-generated | |
42 | dnl builtins for atomic operations for various integral sizes. | |
43 | dnl | |
44 | AC_DEFUN([LIBAT_TEST_ATOMIC_INIT],[ | |
45 | # Do link tests if possible, instead asm tests, limited to some platforms | |
46 | # see discussion in PR target/40134, PR libstdc++/40133 and the thread | |
47 | # starting at http://gcc.gnu.org/ml/gcc-patches/2009-07/msg00322.html | |
48 | atomic_builtins_link_tests=no | |
49 | if test x$gcc_no_link != xyes; then | |
50 | # Can do link tests. Limit to some tested platforms | |
51 | case "$host" in | |
52 | *-*-linux* | *-*-uclinux* | *-*-kfreebsd*-gnu | *-*-gnu*) | |
53 | atomic_builtins_link_tests=yes | |
54 | ;; | |
55 | esac | |
56 | fi | |
57 | ]) | |
58 | AC_DEFUN([LIBAT_TEST_ATOMIC_BUILTIN],[ | |
59 | AC_CACHE_CHECK([$1],[$2],[ | |
60 | AC_LANG_CONFTEST([AC_LANG_PROGRAM([],[$3])]) | |
61 | if test x$atomic_builtins_link_tests = xyes; then | |
62 | if AC_TRY_EVAL(ac_link); then | |
63 | eval $2=yes | |
64 | else | |
65 | eval $2=no | |
66 | fi | |
67 | else | |
68 | old_CFLAGS="$CFLAGS" | |
69 | # Compile unoptimized. | |
f699ded5 | 70 | CFLAGS="$CFLAGS -O0 -S" |
6db1d2ca | 71 | if AC_TRY_EVAL(ac_compile); then |
72 | if grep __atomic_ conftest.s >/dev/null 2>&1 ; then | |
73 | eval $2=no | |
74 | else | |
75 | eval $2=yes | |
76 | fi | |
b322ad89 | 77 | else |
78 | eval $2=no | |
6db1d2ca | 79 | fi |
80 | CFLAGS="$old_CFLAGS" | |
81 | fi | |
82 | rm -f conftest* | |
83 | ]) | |
84 | ]) | |
85 | ||
86 | dnl | |
87 | dnl Test if we have __atomic_load and __atomic_store for mode $1, size $2 | |
88 | dnl | |
89 | AC_DEFUN([LIBAT_HAVE_ATOMIC_LOADSTORE],[ | |
90 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_load/store for size $2], | |
91 | [libat_cv_have_at_ldst_$2], | |
92 | [typedef int T __attribute__((mode($1))); | |
93 | T *x; volatile T sink; asm("" : "=g"(x)); | |
94 | sink = __atomic_load_n(x, 0); | |
95 | __atomic_store_n(x, sink, 0);]) | |
96 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_LDST_$2], [$libat_cv_have_at_ldst_$2], | |
97 | [Have __atomic_load/store for $2 byte integers.]) | |
98 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_LDST_$2 HAVE_ATOMIC_LDST_$2]) | |
d5f5fa27 | 99 | AH_BOTTOM([#define FAST_ATOMIC_LDST_$2 HAVE_ATOMIC_LDST_$2]) |
6db1d2ca | 100 | ]) |
101 | ||
102 | dnl | |
103 | dnl Test if we have __atomic_test_and_set for mode $1, size $2 | |
104 | dnl | |
105 | AC_DEFUN([LIBAT_HAVE_ATOMIC_TAS],[ | |
106 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_test_and_set for size $2], | |
107 | [libat_cv_have_at_tas_$2], | |
108 | [typedef int T __attribute__((mode($1))); T *x; asm("" : "=g"(x)); | |
109 | __atomic_test_and_set(x, 0);]) | |
110 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_TAS_$2], [$libat_cv_have_at_tas_$2], | |
111 | [Have __atomic_test_and_set for $2 byte integers.]) | |
112 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_TAS_$2 HAVE_ATOMIC_TAS_$2]) | |
113 | ]) | |
114 | ||
115 | dnl | |
116 | dnl Test if we have __atomic_exchange for mode $1, size $2 | |
117 | dnl | |
118 | AC_DEFUN([LIBAT_HAVE_ATOMIC_EXCHANGE],[ | |
119 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_exchange for size $2], | |
120 | [libat_cv_have_at_exch_$2], | |
121 | [typedef int T __attribute__((mode($1))); T *x; asm("" : "=g"(x)); | |
122 | __atomic_exchange_n(x, 0, 0);]) | |
123 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_EXCHANGE_$2], [$libat_cv_have_at_exch_$2], | |
124 | [Have __atomic_exchange for $2 byte integers.]) | |
125 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_EXCHANGE_$2 HAVE_ATOMIC_EXCHANGE_$2]) | |
126 | ]) | |
127 | ||
128 | dnl | |
129 | dnl Test if we have __atomic_compare_exchange for mode $1, size $2 | |
130 | dnl | |
131 | AC_DEFUN([LIBAT_HAVE_ATOMIC_CAS],[ | |
132 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_compare_exchange for size $2], | |
133 | [libat_cv_have_at_cas_$2], | |
134 | [typedef int T __attribute__((mode($1))); T *x, *y; | |
135 | asm("" : "=g"(x), "=g"(y)); | |
136 | __atomic_compare_exchange_n(x, y, 0, 0, 0, 0);]) | |
137 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_CAS_$2], [$libat_cv_have_at_cas_$2], | |
138 | [Have __atomic_compare_exchange for $2 byte integers.]) | |
139 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_CAS_$2 HAVE_ATOMIC_CAS_$2]) | |
140 | ]) | |
141 | ||
142 | dnl | |
143 | dnl Test if we have __atomic_fetch_add for mode $1, size $2 | |
144 | dnl | |
145 | AC_DEFUN([LIBAT_HAVE_ATOMIC_FETCH_ADD],[ | |
146 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_fetch_add for size $2], | |
147 | [libat_cv_have_at_fadd_$2], | |
148 | [typedef int T __attribute__((mode($1))); T *x, y; | |
149 | asm("" : "=g"(x), "=g"(y)); | |
150 | __atomic_fetch_add (x, y, 0); | |
151 | __atomic_add_fetch (x, y, 0);]) | |
152 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_FETCH_ADD_$2], [$libat_cv_have_at_fadd_$2], | |
153 | [Have __atomic_fetch_add for $2 byte integers.]) | |
154 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_FETCH_ADD_$2 HAVE_ATOMIC_FETCH_ADD_$2]) | |
155 | ]) | |
156 | ||
157 | dnl | |
158 | dnl Test if we have __atomic_fetch_op for all op for mode $1, size $2 | |
159 | dnl | |
160 | AC_DEFUN([LIBAT_HAVE_ATOMIC_FETCH_OP],[ | |
161 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_fetch_op for size $2], | |
162 | [libat_cv_have_at_fop_$2], | |
163 | [typedef int T __attribute__((mode($1))); T *x, y; | |
164 | asm("" : "=g"(x), "=g"(y)); | |
165 | __atomic_fetch_add (x, y, 0); __atomic_add_fetch (x, y, 0); | |
166 | __atomic_fetch_sub (x, y, 0); __atomic_sub_fetch (x, y, 0); | |
167 | __atomic_fetch_and (x, y, 0); __atomic_and_fetch (x, y, 0); | |
168 | __atomic_fetch_nand (x, y, 0); __atomic_nand_fetch (x, y, 0); | |
169 | __atomic_fetch_xor (x, y, 0); __atomic_xor_fetch (x, y, 0); | |
170 | __atomic_fetch_or (x, y, 0); __atomic_or_fetch (x, y, 0); ]) | |
171 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_FETCH_OP_$2], [$libat_cv_have_at_fop_$2], | |
172 | [Have __atomic_fetch_op for all op for $2 byte integers.]) | |
173 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_FETCH_OP_$2 HAVE_ATOMIC_FETCH_OP_$2]) | |
174 | ]) | |
175 | ||
176 | dnl | |
177 | dnl Test for the size of the target word. | |
178 | dnl | |
179 | AC_DEFUN([LIBAT_WORDSIZE],[ | |
180 | AC_CACHE_CHECK([for the word size],[libat_cv_wordsize], | |
181 | [AC_COMPUTE_INT(libat_cv_wordsize, | |
182 | [sizeof(word)], [typedef int word __attribute__((mode(word)));], | |
183 | AC_ERROR([Could not determine word size.]))]) | |
184 | AC_DEFINE_UNQUOTED(WORDSIZE, $libat_cv_wordsize, | |
185 | [The word size in bytes of the machine.]) | |
186 | ]) | |
187 | ||
188 | dnl | |
e1f6d62c | 189 | dnl Check whether the target supports the ifunc attribute. |
6db1d2ca | 190 | dnl |
191 | AC_DEFUN([LIBAT_CHECK_IFUNC], [ | |
e1f6d62c | 192 | AC_CACHE_CHECK([whether the target supports the ifunc attribute], |
193 | libat_cv_have_ifunc, [ | |
6db1d2ca | 194 | save_CFLAGS="$CFLAGS" |
195 | CFLAGS="$CFLAGS -Werror" | |
196 | AC_TRY_LINK([ | |
197 | int foo_alt(void) { return 0; } | |
9d147806 | 198 | typedef int F (void); |
199 | F *foo_sel(void) { return foo_alt; } | |
6db1d2ca | 200 | int foo(void) __attribute__((ifunc("foo_sel")));], |
201 | [return foo();], libat_cv_have_ifunc=yes, libat_cv_have_ifunc=no)]) | |
202 | LIBAT_DEFINE_YESNO([HAVE_IFUNC], [$libat_cv_have_ifunc], | |
203 | [Define to 1 if the target supports __attribute__((ifunc(...))).]) | |
204 | ]) | |
205 | ||
206 | dnl ---------------------------------------------------------------------- | |
207 | dnl This whole bit snagged from libitm. | |
208 | ||
209 | dnl Check whether the target supports hidden visibility. | |
210 | AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_VISIBILITY], [ | |
211 | AC_CACHE_CHECK([whether the target supports hidden visibility], | |
212 | libat_cv_have_attribute_visibility, [ | |
213 | save_CFLAGS="$CFLAGS" | |
214 | CFLAGS="$CFLAGS -Werror" | |
215 | AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }], | |
216 | [], libat_cv_have_attribute_visibility=yes, | |
217 | libat_cv_have_attribute_visibility=no) | |
218 | CFLAGS="$save_CFLAGS"]) | |
219 | if test $libat_cv_have_attribute_visibility = yes; then | |
220 | AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1, | |
221 | [Define to 1 if the target supports __attribute__((visibility(...))).]) | |
222 | fi]) | |
223 | ||
224 | dnl Check whether the target supports dllexport | |
225 | AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_DLLEXPORT], [ | |
226 | AC_CACHE_CHECK([whether the target supports dllexport], | |
227 | libat_cv_have_attribute_dllexport, [ | |
228 | save_CFLAGS="$CFLAGS" | |
229 | CFLAGS="$CFLAGS -Werror" | |
230 | AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }], | |
231 | [], libat_cv_have_attribute_dllexport=yes, | |
232 | libat_cv_have_attribute_dllexport=no) | |
233 | CFLAGS="$save_CFLAGS"]) | |
234 | if test $libat_cv_have_attribute_dllexport = yes; then | |
235 | AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1, | |
236 | [Define to 1 if the target supports __attribute__((dllexport)).]) | |
237 | fi]) | |
238 | ||
239 | dnl Check whether the target supports symbol aliases. | |
240 | AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_ALIAS], [ | |
241 | AC_CACHE_CHECK([whether the target supports symbol aliases], | |
242 | libat_cv_have_attribute_alias, [ | |
243 | AC_TRY_LINK([ | |
244 | void foo(void) { } | |
245 | extern void bar(void) __attribute__((alias("foo")));], | |
246 | [bar();], libat_cv_have_attribute_alias=yes, libat_cv_have_attribute_alias=no)]) | |
247 | if test $libat_cv_have_attribute_alias = yes; then | |
248 | AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1, | |
249 | [Define to 1 if the target supports __attribute__((alias(...))).]) | |
250 | fi]) | |
251 | ||
252 | dnl ---------------------------------------------------------------------- | |
253 | dnl This whole bit snagged from libstdc++-v3. | |
254 | ||
255 | dnl | |
256 | dnl LIBAT_ENABLE | |
257 | dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING) | |
258 | dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c) | |
259 | dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER) | |
260 | dnl | |
261 | dnl See docs/html/17_intro/configury.html#enable for documentation. | |
262 | dnl | |
263 | m4_define([LIBAT_ENABLE],[dnl | |
264 | m4_define([_g_switch],[--enable-$1])dnl | |
265 | m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl | |
266 | AC_ARG_ENABLE($1,_g_help, | |
267 | m4_bmatch([$5], | |
268 | [^permit ], | |
269 | [[ | |
270 | case "$enableval" in | |
271 | m4_bpatsubst([$5],[permit ])) ;; | |
272 | *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;; | |
273 | dnl Idea for future: generate a URL pointing to | |
274 | dnl "onlinedocs/configopts.html#whatever" | |
275 | esac | |
276 | ]], | |
277 | [^$], | |
278 | [[ | |
279 | case "$enableval" in | |
280 | yes|no) ;; | |
281 | *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;; | |
282 | esac | |
283 | ]], | |
284 | [[$5]]), | |
285 | [enable_]m4_bpatsubst([$1],-,_)[=][$2]) | |
286 | m4_undefine([_g_switch])dnl | |
287 | m4_undefine([_g_help])dnl | |
288 | ]) | |
289 | ||
290 | dnl | |
291 | dnl If GNU ld is in use, check to see if tricky linker opts can be used. If | |
292 | dnl the native linker is in use, all variables will be defined to something | |
293 | dnl safe (like an empty string). | |
294 | dnl | |
295 | dnl Defines: | |
296 | dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible | |
297 | dnl OPT_LDFLAGS='-Wl,-O1' if possible | |
298 | dnl LD (as a side effect of testing) | |
299 | dnl Sets: | |
300 | dnl with_gnu_ld | |
301 | dnl libat_ld_is_gold (possibly) | |
302 | dnl libat_gnu_ld_version (possibly) | |
303 | dnl | |
304 | dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will | |
305 | dnl set libat_gnu_ld_version to 12345. Zeros cause problems. | |
306 | dnl | |
307 | AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [ | |
308 | # If we're not using GNU ld, then there's no point in even trying these | |
309 | # tests. Check for that first. We should have already tested for gld | |
310 | # by now (in libtool), but require it now just to be safe... | |
311 | test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS='' | |
312 | test -z "$OPT_LDFLAGS" && OPT_LDFLAGS='' | |
313 | AC_REQUIRE([AC_PROG_LD]) | |
314 | AC_REQUIRE([AC_PROG_AWK]) | |
315 | ||
316 | # The name set by libtool depends on the version of libtool. Shame on us | |
317 | # for depending on an impl detail, but c'est la vie. Older versions used | |
318 | # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on | |
319 | # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually | |
320 | # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't | |
321 | # set (hence we're using an older libtool), then set it. | |
322 | if test x${with_gnu_ld+set} != xset; then | |
323 | if test x${ac_cv_prog_gnu_ld+set} != xset; then | |
324 | # We got through "ac_require(ac_prog_ld)" and still not set? Huh? | |
325 | with_gnu_ld=no | |
326 | else | |
327 | with_gnu_ld=$ac_cv_prog_gnu_ld | |
328 | fi | |
329 | fi | |
330 | ||
331 | # Start by getting the version number. I think the libtool test already | |
332 | # does some of this, but throws away the result. | |
333 | libat_ld_is_gold=no | |
334 | if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then | |
335 | libat_ld_is_gold=yes | |
336 | fi | |
337 | changequote(,) | |
338 | ldver=`$LD --version 2>/dev/null | | |
339 | 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'` | |
340 | changequote([,]) | |
341 | libat_gnu_ld_version=`echo $ldver | \ | |
342 | $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'` | |
343 | ||
344 | # Set --gc-sections. | |
345 | if test "$with_gnu_ld" = "notbroken"; then | |
346 | # GNU ld it is! Joy and bunny rabbits! | |
347 | ||
348 | # All these tests are for C++; save the language and the compiler flags. | |
349 | # Need to do this so that g++ won't try to link in libstdc++ | |
350 | ac_test_CFLAGS="${CFLAGS+set}" | |
351 | ac_save_CFLAGS="$CFLAGS" | |
352 | CFLAGS='-x c++ -Wl,--gc-sections' | |
353 | ||
354 | # Check for -Wl,--gc-sections | |
355 | # XXX This test is broken at the moment, as symbols required for linking | |
356 | # are now in libsupc++ (not built yet). In addition, this test has | |
357 | # cored on solaris in the past. In addition, --gc-sections doesn't | |
358 | # really work at the moment (keeps on discarding used sections, first | |
359 | # .eh_frame and now some of the glibc sections for iconv). | |
360 | # Bzzzzt. Thanks for playing, maybe next time. | |
361 | AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections]) | |
362 | AC_TRY_RUN([ | |
363 | int main(void) | |
364 | { | |
365 | try { throw 1; } | |
366 | catch (...) { }; | |
367 | return 0; | |
368 | } | |
369 | ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes]) | |
370 | if test "$ac_test_CFLAGS" = set; then | |
371 | CFLAGS="$ac_save_CFLAGS" | |
372 | else | |
373 | # this is the suspicious part | |
374 | CFLAGS='' | |
375 | fi | |
376 | if test "$ac_sectionLDflags" = "yes"; then | |
377 | SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS" | |
378 | fi | |
379 | AC_MSG_RESULT($ac_sectionLDflags) | |
380 | fi | |
381 | ||
382 | # Set linker optimization flags. | |
383 | if test x"$with_gnu_ld" = x"yes"; then | |
384 | OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS" | |
385 | fi | |
386 | ||
387 | AC_SUBST(SECTION_LDFLAGS) | |
388 | AC_SUBST(OPT_LDFLAGS) | |
389 | ]) | |
390 | ||
391 | ||
392 | dnl | |
393 | dnl If GNU ld is in use, check to see if tricky linker opts can be used. If | |
394 | dnl the native linker is in use, all variables will be defined to something | |
395 | dnl safe (like an empty string). | |
396 | dnl | |
397 | dnl Defines: | |
398 | dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible | |
399 | dnl OPT_LDFLAGS='-Wl,-O1' if possible | |
400 | dnl LD (as a side effect of testing) | |
401 | dnl Sets: | |
402 | dnl with_gnu_ld | |
403 | dnl libat_ld_is_gold (possibly) | |
404 | dnl libat_gnu_ld_version (possibly) | |
405 | dnl | |
406 | dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will | |
407 | dnl set libat_gnu_ld_version to 12345. Zeros cause problems. | |
408 | dnl | |
409 | AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [ | |
410 | # If we're not using GNU ld, then there's no point in even trying these | |
411 | # tests. Check for that first. We should have already tested for gld | |
412 | # by now (in libtool), but require it now just to be safe... | |
413 | test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS='' | |
414 | test -z "$OPT_LDFLAGS" && OPT_LDFLAGS='' | |
415 | AC_REQUIRE([AC_PROG_LD]) | |
416 | AC_REQUIRE([AC_PROG_AWK]) | |
417 | ||
418 | # The name set by libtool depends on the version of libtool. Shame on us | |
419 | # for depending on an impl detail, but c'est la vie. Older versions used | |
420 | # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on | |
421 | # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually | |
422 | # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't | |
423 | # set (hence we're using an older libtool), then set it. | |
424 | if test x${with_gnu_ld+set} != xset; then | |
425 | if test x${ac_cv_prog_gnu_ld+set} != xset; then | |
426 | # We got through "ac_require(ac_prog_ld)" and still not set? Huh? | |
427 | with_gnu_ld=no | |
428 | else | |
429 | with_gnu_ld=$ac_cv_prog_gnu_ld | |
430 | fi | |
431 | fi | |
432 | ||
433 | # Start by getting the version number. I think the libtool test already | |
434 | # does some of this, but throws away the result. | |
435 | libat_ld_is_gold=no | |
436 | if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then | |
437 | libat_ld_is_gold=yes | |
438 | fi | |
439 | changequote(,) | |
440 | ldver=`$LD --version 2>/dev/null | | |
441 | 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'` | |
442 | changequote([,]) | |
443 | libat_gnu_ld_version=`echo $ldver | \ | |
444 | $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'` | |
445 | ||
446 | # Set --gc-sections. | |
447 | if test "$with_gnu_ld" = "notbroken"; then | |
448 | # GNU ld it is! Joy and bunny rabbits! | |
449 | ||
450 | # All these tests are for C++; save the language and the compiler flags. | |
451 | # Need to do this so that g++ won't try to link in libstdc++ | |
452 | ac_test_CFLAGS="${CFLAGS+set}" | |
453 | ac_save_CFLAGS="$CFLAGS" | |
454 | CFLAGS='-x c++ -Wl,--gc-sections' | |
455 | ||
456 | # Check for -Wl,--gc-sections | |
457 | # XXX This test is broken at the moment, as symbols required for linking | |
458 | # are now in libsupc++ (not built yet). In addition, this test has | |
459 | # cored on solaris in the past. In addition, --gc-sections doesn't | |
460 | # really work at the moment (keeps on discarding used sections, first | |
461 | # .eh_frame and now some of the glibc sections for iconv). | |
462 | # Bzzzzt. Thanks for playing, maybe next time. | |
463 | AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections]) | |
464 | AC_TRY_RUN([ | |
465 | int main(void) | |
466 | { | |
467 | try { throw 1; } | |
468 | catch (...) { }; | |
469 | return 0; | |
470 | } | |
471 | ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes]) | |
472 | if test "$ac_test_CFLAGS" = set; then | |
473 | CFLAGS="$ac_save_CFLAGS" | |
474 | else | |
475 | # this is the suspicious part | |
476 | CFLAGS='' | |
477 | fi | |
478 | if test "$ac_sectionLDflags" = "yes"; then | |
479 | SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS" | |
480 | fi | |
481 | AC_MSG_RESULT($ac_sectionLDflags) | |
482 | fi | |
483 | ||
484 | # Set linker optimization flags. | |
485 | if test x"$with_gnu_ld" = x"yes"; then | |
486 | OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS" | |
487 | fi | |
488 | ||
489 | AC_SUBST(SECTION_LDFLAGS) | |
490 | AC_SUBST(OPT_LDFLAGS) | |
491 | ]) | |
492 | ||
493 | ||
494 | dnl | |
495 | dnl Add version tags to symbols in shared library (or not), additionally | |
496 | dnl marking other symbols as private/local (or not). | |
497 | dnl | |
498 | dnl --enable-symvers=style adds a version script to the linker call when | |
499 | dnl creating the shared library. The choice of version script is | |
500 | dnl controlled by 'style'. | |
501 | dnl --disable-symvers does not. | |
502 | dnl + Usage: LIBAT_ENABLE_SYMVERS[(DEFAULT)] | |
503 | dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to | |
504 | dnl choose a default style based on linker characteristics. Passing | |
505 | dnl 'no' disables versioning. | |
506 | dnl | |
507 | AC_DEFUN([LIBAT_ENABLE_SYMVERS], [ | |
508 | ||
509 | LIBAT_ENABLE(symvers,yes,[=STYLE], | |
510 | [enables symbol versioning of the shared library], | |
511 | [permit yes|no|gnu*|sun]) | |
512 | ||
513 | # If we never went through the LIBAT_CHECK_LINKER_FEATURES macro, then we | |
514 | # don't know enough about $LD to do tricks... | |
515 | AC_REQUIRE([LIBAT_CHECK_LINKER_FEATURES]) | |
516 | ||
517 | # Turn a 'yes' into a suitable default. | |
518 | if test x$enable_symvers = xyes ; then | |
519 | # FIXME The following test is too strict, in theory. | |
520 | if test $enable_shared = no || test "x$LD" = x; then | |
521 | enable_symvers=no | |
522 | else | |
523 | if test $with_gnu_ld = yes ; then | |
524 | enable_symvers=gnu | |
525 | else | |
526 | case ${target_os} in | |
527 | # Sun symbol versioning exists since Solaris 2.5. | |
528 | solaris2.[[5-9]]* | solaris2.1[[0-9]]*) | |
529 | enable_symvers=sun ;; | |
530 | *) | |
531 | enable_symvers=no ;; | |
532 | esac | |
533 | fi | |
534 | fi | |
535 | fi | |
536 | ||
537 | # Check if 'sun' was requested on non-Solaris 2 platforms. | |
538 | if test x$enable_symvers = xsun ; then | |
539 | case ${target_os} in | |
540 | solaris2*) | |
541 | # All fine. | |
542 | ;; | |
543 | *) | |
544 | # Unlikely to work. | |
545 | AC_MSG_WARN([=== You have requested Sun symbol versioning, but]) | |
546 | AC_MSG_WARN([=== you are not targetting Solaris 2.]) | |
547 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
548 | enable_symvers=no | |
549 | ;; | |
550 | esac | |
551 | fi | |
552 | ||
553 | # Check to see if libgcc_s exists, indicating that shared libgcc is possible. | |
554 | if test $enable_symvers != no; then | |
555 | AC_MSG_CHECKING([for shared libgcc]) | |
556 | ac_save_CFLAGS="$CFLAGS" | |
557 | CFLAGS=' -lgcc_s' | |
558 | AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes, libat_shared_libgcc=no) | |
559 | CFLAGS="$ac_save_CFLAGS" | |
560 | if test $libat_shared_libgcc = no; then | |
561 | cat > conftest.c <<EOF | |
562 | int main (void) { return 0; } | |
563 | EOF | |
564 | changequote(,)dnl | |
565 | libat_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ | |
566 | -shared -shared-libgcc -o conftest.so \ | |
567 | conftest.c -v 2>&1 >/dev/null \ | |
568 | | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'` | |
569 | changequote([,])dnl | |
570 | rm -f conftest.c conftest.so | |
571 | if test x${libat_libgcc_s_suffix+set} = xset; then | |
572 | CFLAGS=" -lgcc_s$libat_libgcc_s_suffix" | |
573 | AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes) | |
574 | CFLAGS="$ac_save_CFLAGS" | |
575 | fi | |
576 | fi | |
577 | AC_MSG_RESULT($libat_shared_libgcc) | |
578 | fi | |
579 | ||
580 | # For GNU ld, we need at least this version. The format is described in | |
581 | # LIBAT_CHECK_LINKER_FEATURES above. | |
582 | libat_min_gnu_ld_version=21400 | |
583 | # XXXXXXXXXXX libat_gnu_ld_version=21390 | |
584 | ||
585 | # Check to see if unspecified "yes" value can win, given results above. | |
586 | # Change "yes" into either "no" or a style name. | |
587 | if test $enable_symvers != no && test $libat_shared_libgcc = yes; then | |
588 | if test $with_gnu_ld = yes; then | |
589 | if test $libat_gnu_ld_version -ge $libat_min_gnu_ld_version ; then | |
590 | enable_symvers=gnu | |
591 | elif test $libat_ld_is_gold = yes ; then | |
592 | enable_symvers=gnu | |
593 | else | |
594 | # The right tools, the right setup, but too old. Fallbacks? | |
595 | AC_MSG_WARN(=== Linker version $libat_gnu_ld_version is too old for) | |
596 | AC_MSG_WARN(=== full symbol versioning support in this release of GCC.) | |
597 | AC_MSG_WARN(=== You would need to upgrade your binutils to version) | |
598 | AC_MSG_WARN(=== $libat_min_gnu_ld_version or later and rebuild GCC.) | |
599 | if test $libat_gnu_ld_version -ge 21200 ; then | |
600 | # Globbing fix is present, proper block support is not. | |
601 | dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.]) | |
602 | dnl enable_symvers=??? | |
603 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
604 | enable_symvers=no | |
605 | else | |
606 | # 2.11 or older. | |
607 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
608 | enable_symvers=no | |
609 | fi | |
610 | fi | |
611 | elif test $enable_symvers = sun; then | |
612 | : All interesting versions of Sun ld support sun style symbol versioning. | |
613 | else | |
614 | # just fail for now | |
615 | AC_MSG_WARN([=== You have requested some kind of symbol versioning, but]) | |
616 | AC_MSG_WARN([=== either you are not using a supported linker, or you are]) | |
617 | AC_MSG_WARN([=== not building a shared libgcc_s (which is required).]) | |
618 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
619 | enable_symvers=no | |
620 | fi | |
621 | fi | |
622 | if test $enable_symvers = gnu; then | |
623 | AC_DEFINE(LIBAT_GNU_SYMBOL_VERSIONING, 1, | |
624 | [Define to 1 if GNU symbol versioning is used for libatomic.]) | |
625 | fi | |
626 | ||
627 | AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB, test $enable_symvers != no) | |
628 | AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu) | |
629 | AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun) | |
630 | AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers) | |
631 | ]) | |
632 | ||
633 | dnl ---------------------------------------------------------------------- | |
634 | sinclude(../libtool.m4) | |
2446cb9b | 635 | sinclude(../config/enable.m4) |
636 | sinclude(../config/cet.m4) | |
6db1d2ca | 637 | dnl The lines below arrange for aclocal not to bring an installed |
638 | dnl libtool.m4 into aclocal.m4, while still arranging for automake to | |
639 | dnl add a definition of LIBTOOL to Makefile.in. | |
640 | ifelse(,,,[AC_SUBST(LIBTOOL) | |
641 | AC_DEFUN([AM_PROG_LIBTOOL]) | |
642 | AC_DEFUN([AC_LIBTOOL_DLOPEN]) | |
643 | AC_DEFUN([AC_PROG_LD]) | |
644 | ]) |