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Commit | Line | Data |
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48310492 RH |
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], | |
28 | [AC_COMPILE_IFELSE([int x __attribute__((mode($1)));], | |
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. | |
70 | CFLAGS='-O0 -S' | |
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 | |
0fe5522f RH |
77 | else |
78 | eval $2=no | |
48310492 RH |
79 | fi |
80 | CFLAGS="$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]) | |
99 | ]) | |
100 | ||
101 | dnl | |
102 | dnl Test if we have __atomic_test_and_set for mode $1, size $2 | |
103 | dnl | |
104 | AC_DEFUN([LIBAT_HAVE_ATOMIC_TAS],[ | |
105 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_test_and_set for size $2], | |
106 | [libat_cv_have_at_tas_$2], | |
107 | [typedef int T __attribute__((mode($1))); T *x; asm("" : "=g"(x)); | |
108 | __atomic_test_and_set(x, 0);]) | |
109 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_TAS_$2], [$libat_cv_have_at_tas_$2], | |
110 | [Have __atomic_test_and_set for $2 byte integers.]) | |
111 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_TAS_$2 HAVE_ATOMIC_TAS_$2]) | |
112 | ]) | |
113 | ||
114 | dnl | |
115 | dnl Test if we have __atomic_exchange for mode $1, size $2 | |
116 | dnl | |
117 | AC_DEFUN([LIBAT_HAVE_ATOMIC_EXCHANGE],[ | |
118 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_exchange for size $2], | |
119 | [libat_cv_have_at_exch_$2], | |
120 | [typedef int T __attribute__((mode($1))); T *x; asm("" : "=g"(x)); | |
121 | __atomic_exchange_n(x, 0, 0);]) | |
122 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_EXCHANGE_$2], [$libat_cv_have_at_exch_$2], | |
123 | [Have __atomic_exchange for $2 byte integers.]) | |
124 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_EXCHANGE_$2 HAVE_ATOMIC_EXCHANGE_$2]) | |
125 | ]) | |
126 | ||
127 | dnl | |
128 | dnl Test if we have __atomic_compare_exchange for mode $1, size $2 | |
129 | dnl | |
130 | AC_DEFUN([LIBAT_HAVE_ATOMIC_CAS],[ | |
131 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_compare_exchange for size $2], | |
132 | [libat_cv_have_at_cas_$2], | |
133 | [typedef int T __attribute__((mode($1))); T *x, *y; | |
134 | asm("" : "=g"(x), "=g"(y)); | |
135 | __atomic_compare_exchange_n(x, y, 0, 0, 0, 0);]) | |
136 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_CAS_$2], [$libat_cv_have_at_cas_$2], | |
137 | [Have __atomic_compare_exchange for $2 byte integers.]) | |
138 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_CAS_$2 HAVE_ATOMIC_CAS_$2]) | |
139 | ]) | |
140 | ||
141 | dnl | |
142 | dnl Test if we have __atomic_fetch_add for mode $1, size $2 | |
143 | dnl | |
144 | AC_DEFUN([LIBAT_HAVE_ATOMIC_FETCH_ADD],[ | |
145 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_fetch_add for size $2], | |
146 | [libat_cv_have_at_fadd_$2], | |
147 | [typedef int T __attribute__((mode($1))); T *x, y; | |
148 | asm("" : "=g"(x), "=g"(y)); | |
149 | __atomic_fetch_add (x, y, 0); | |
150 | __atomic_add_fetch (x, y, 0);]) | |
151 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_FETCH_ADD_$2], [$libat_cv_have_at_fadd_$2], | |
152 | [Have __atomic_fetch_add for $2 byte integers.]) | |
153 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_FETCH_ADD_$2 HAVE_ATOMIC_FETCH_ADD_$2]) | |
154 | ]) | |
155 | ||
156 | dnl | |
157 | dnl Test if we have __atomic_fetch_op for all op for mode $1, size $2 | |
158 | dnl | |
159 | AC_DEFUN([LIBAT_HAVE_ATOMIC_FETCH_OP],[ | |
160 | LIBAT_TEST_ATOMIC_BUILTIN([for __atomic_fetch_op for size $2], | |
161 | [libat_cv_have_at_fop_$2], | |
162 | [typedef int T __attribute__((mode($1))); T *x, y; | |
163 | asm("" : "=g"(x), "=g"(y)); | |
164 | __atomic_fetch_add (x, y, 0); __atomic_add_fetch (x, y, 0); | |
165 | __atomic_fetch_sub (x, y, 0); __atomic_sub_fetch (x, y, 0); | |
166 | __atomic_fetch_and (x, y, 0); __atomic_and_fetch (x, y, 0); | |
167 | __atomic_fetch_nand (x, y, 0); __atomic_nand_fetch (x, y, 0); | |
168 | __atomic_fetch_xor (x, y, 0); __atomic_xor_fetch (x, y, 0); | |
169 | __atomic_fetch_or (x, y, 0); __atomic_or_fetch (x, y, 0); ]) | |
170 | LIBAT_DEFINE_YESNO([HAVE_ATOMIC_FETCH_OP_$2], [$libat_cv_have_at_fop_$2], | |
171 | [Have __atomic_fetch_op for all op for $2 byte integers.]) | |
172 | AH_BOTTOM([#define MAYBE_HAVE_ATOMIC_FETCH_OP_$2 HAVE_ATOMIC_FETCH_OP_$2]) | |
173 | ]) | |
174 | ||
175 | dnl | |
176 | dnl Test for the size of the target word. | |
177 | dnl | |
178 | AC_DEFUN([LIBAT_WORDSIZE],[ | |
179 | AC_CACHE_CHECK([for the word size],[libat_cv_wordsize], | |
180 | [AC_COMPUTE_INT(libat_cv_wordsize, | |
181 | [sizeof(word)], [typedef int word __attribute__((mode(word)));], | |
182 | AC_ERROR([Could not determine word size.]))]) | |
183 | AC_DEFINE_UNQUOTED(WORDSIZE, $libat_cv_wordsize, | |
184 | [The word size in bytes of the machine.]) | |
185 | ]) | |
186 | ||
187 | dnl | |
188 | dnl Check whether the target supports ifuncs. | |
189 | dnl | |
190 | AC_DEFUN([LIBAT_CHECK_IFUNC], [ | |
191 | AC_CACHE_CHECK([whether the target supports funcs], libat_cv_have_ifunc, [ | |
192 | save_CFLAGS="$CFLAGS" | |
193 | CFLAGS="$CFLAGS -Werror" | |
194 | AC_TRY_LINK([ | |
195 | int foo_alt(void) { return 0; } | |
196 | void *foo_sel(void) { return foo_alt; } | |
197 | int foo(void) __attribute__((ifunc("foo_sel")));], | |
198 | [return foo();], libat_cv_have_ifunc=yes, libat_cv_have_ifunc=no)]) | |
199 | LIBAT_DEFINE_YESNO([HAVE_IFUNC], [$libat_cv_have_ifunc], | |
200 | [Define to 1 if the target supports __attribute__((ifunc(...))).]) | |
201 | ]) | |
202 | ||
203 | dnl ---------------------------------------------------------------------- | |
204 | dnl This whole bit snagged from libitm. | |
205 | ||
206 | dnl Check whether the target supports hidden visibility. | |
207 | AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_VISIBILITY], [ | |
208 | AC_CACHE_CHECK([whether the target supports hidden visibility], | |
209 | libat_cv_have_attribute_visibility, [ | |
210 | save_CFLAGS="$CFLAGS" | |
211 | CFLAGS="$CFLAGS -Werror" | |
212 | AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }], | |
213 | [], libat_cv_have_attribute_visibility=yes, | |
214 | libat_cv_have_attribute_visibility=no) | |
215 | CFLAGS="$save_CFLAGS"]) | |
216 | if test $libat_cv_have_attribute_visibility = yes; then | |
217 | AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1, | |
218 | [Define to 1 if the target supports __attribute__((visibility(...))).]) | |
219 | fi]) | |
220 | ||
221 | dnl Check whether the target supports dllexport | |
222 | AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_DLLEXPORT], [ | |
223 | AC_CACHE_CHECK([whether the target supports dllexport], | |
224 | libat_cv_have_attribute_dllexport, [ | |
225 | save_CFLAGS="$CFLAGS" | |
226 | CFLAGS="$CFLAGS -Werror" | |
227 | AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }], | |
228 | [], libat_cv_have_attribute_dllexport=yes, | |
229 | libat_cv_have_attribute_dllexport=no) | |
230 | CFLAGS="$save_CFLAGS"]) | |
231 | if test $libat_cv_have_attribute_dllexport = yes; then | |
232 | AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1, | |
233 | [Define to 1 if the target supports __attribute__((dllexport)).]) | |
234 | fi]) | |
235 | ||
236 | dnl Check whether the target supports symbol aliases. | |
237 | AC_DEFUN([LIBAT_CHECK_ATTRIBUTE_ALIAS], [ | |
238 | AC_CACHE_CHECK([whether the target supports symbol aliases], | |
239 | libat_cv_have_attribute_alias, [ | |
240 | AC_TRY_LINK([ | |
241 | void foo(void) { } | |
242 | extern void bar(void) __attribute__((alias("foo")));], | |
243 | [bar();], libat_cv_have_attribute_alias=yes, libat_cv_have_attribute_alias=no)]) | |
244 | if test $libat_cv_have_attribute_alias = yes; then | |
245 | AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1, | |
246 | [Define to 1 if the target supports __attribute__((alias(...))).]) | |
247 | fi]) | |
248 | ||
249 | dnl ---------------------------------------------------------------------- | |
250 | dnl This whole bit snagged from libstdc++-v3. | |
251 | ||
252 | dnl | |
253 | dnl LIBAT_ENABLE | |
254 | dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING) | |
255 | dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c) | |
256 | dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER) | |
257 | dnl | |
258 | dnl See docs/html/17_intro/configury.html#enable for documentation. | |
259 | dnl | |
260 | m4_define([LIBAT_ENABLE],[dnl | |
261 | m4_define([_g_switch],[--enable-$1])dnl | |
262 | m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl | |
263 | AC_ARG_ENABLE($1,_g_help, | |
264 | m4_bmatch([$5], | |
265 | [^permit ], | |
266 | [[ | |
267 | case "$enableval" in | |
268 | m4_bpatsubst([$5],[permit ])) ;; | |
269 | *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;; | |
270 | dnl Idea for future: generate a URL pointing to | |
271 | dnl "onlinedocs/configopts.html#whatever" | |
272 | esac | |
273 | ]], | |
274 | [^$], | |
275 | [[ | |
276 | case "$enableval" in | |
277 | yes|no) ;; | |
278 | *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;; | |
279 | esac | |
280 | ]], | |
281 | [[$5]]), | |
282 | [enable_]m4_bpatsubst([$1],-,_)[=][$2]) | |
283 | m4_undefine([_g_switch])dnl | |
284 | m4_undefine([_g_help])dnl | |
285 | ]) | |
286 | ||
287 | dnl | |
288 | dnl If GNU ld is in use, check to see if tricky linker opts can be used. If | |
289 | dnl the native linker is in use, all variables will be defined to something | |
290 | dnl safe (like an empty string). | |
291 | dnl | |
292 | dnl Defines: | |
293 | dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible | |
294 | dnl OPT_LDFLAGS='-Wl,-O1' if possible | |
295 | dnl LD (as a side effect of testing) | |
296 | dnl Sets: | |
297 | dnl with_gnu_ld | |
298 | dnl libat_ld_is_gold (possibly) | |
299 | dnl libat_gnu_ld_version (possibly) | |
300 | dnl | |
301 | dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will | |
302 | dnl set libat_gnu_ld_version to 12345. Zeros cause problems. | |
303 | dnl | |
304 | AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [ | |
305 | # If we're not using GNU ld, then there's no point in even trying these | |
306 | # tests. Check for that first. We should have already tested for gld | |
307 | # by now (in libtool), but require it now just to be safe... | |
308 | test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS='' | |
309 | test -z "$OPT_LDFLAGS" && OPT_LDFLAGS='' | |
310 | AC_REQUIRE([AC_PROG_LD]) | |
311 | AC_REQUIRE([AC_PROG_AWK]) | |
312 | ||
313 | # The name set by libtool depends on the version of libtool. Shame on us | |
314 | # for depending on an impl detail, but c'est la vie. Older versions used | |
315 | # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on | |
316 | # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually | |
317 | # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't | |
318 | # set (hence we're using an older libtool), then set it. | |
319 | if test x${with_gnu_ld+set} != xset; then | |
320 | if test x${ac_cv_prog_gnu_ld+set} != xset; then | |
321 | # We got through "ac_require(ac_prog_ld)" and still not set? Huh? | |
322 | with_gnu_ld=no | |
323 | else | |
324 | with_gnu_ld=$ac_cv_prog_gnu_ld | |
325 | fi | |
326 | fi | |
327 | ||
328 | # Start by getting the version number. I think the libtool test already | |
329 | # does some of this, but throws away the result. | |
330 | libat_ld_is_gold=no | |
331 | if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then | |
332 | libat_ld_is_gold=yes | |
333 | fi | |
334 | changequote(,) | |
335 | ldver=`$LD --version 2>/dev/null | | |
336 | 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'` | |
337 | changequote([,]) | |
338 | libat_gnu_ld_version=`echo $ldver | \ | |
339 | $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'` | |
340 | ||
341 | # Set --gc-sections. | |
342 | if test "$with_gnu_ld" = "notbroken"; then | |
343 | # GNU ld it is! Joy and bunny rabbits! | |
344 | ||
345 | # All these tests are for C++; save the language and the compiler flags. | |
346 | # Need to do this so that g++ won't try to link in libstdc++ | |
347 | ac_test_CFLAGS="${CFLAGS+set}" | |
348 | ac_save_CFLAGS="$CFLAGS" | |
349 | CFLAGS='-x c++ -Wl,--gc-sections' | |
350 | ||
351 | # Check for -Wl,--gc-sections | |
352 | # XXX This test is broken at the moment, as symbols required for linking | |
353 | # are now in libsupc++ (not built yet). In addition, this test has | |
354 | # cored on solaris in the past. In addition, --gc-sections doesn't | |
355 | # really work at the moment (keeps on discarding used sections, first | |
356 | # .eh_frame and now some of the glibc sections for iconv). | |
357 | # Bzzzzt. Thanks for playing, maybe next time. | |
358 | AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections]) | |
359 | AC_TRY_RUN([ | |
360 | int main(void) | |
361 | { | |
362 | try { throw 1; } | |
363 | catch (...) { }; | |
364 | return 0; | |
365 | } | |
366 | ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes]) | |
367 | if test "$ac_test_CFLAGS" = set; then | |
368 | CFLAGS="$ac_save_CFLAGS" | |
369 | else | |
370 | # this is the suspicious part | |
371 | CFLAGS='' | |
372 | fi | |
373 | if test "$ac_sectionLDflags" = "yes"; then | |
374 | SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS" | |
375 | fi | |
376 | AC_MSG_RESULT($ac_sectionLDflags) | |
377 | fi | |
378 | ||
379 | # Set linker optimization flags. | |
380 | if test x"$with_gnu_ld" = x"yes"; then | |
381 | OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS" | |
382 | fi | |
383 | ||
384 | AC_SUBST(SECTION_LDFLAGS) | |
385 | AC_SUBST(OPT_LDFLAGS) | |
386 | ]) | |
387 | ||
388 | ||
389 | dnl | |
390 | dnl If GNU ld is in use, check to see if tricky linker opts can be used. If | |
391 | dnl the native linker is in use, all variables will be defined to something | |
392 | dnl safe (like an empty string). | |
393 | dnl | |
394 | dnl Defines: | |
395 | dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible | |
396 | dnl OPT_LDFLAGS='-Wl,-O1' if possible | |
397 | dnl LD (as a side effect of testing) | |
398 | dnl Sets: | |
399 | dnl with_gnu_ld | |
400 | dnl libat_ld_is_gold (possibly) | |
401 | dnl libat_gnu_ld_version (possibly) | |
402 | dnl | |
403 | dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will | |
404 | dnl set libat_gnu_ld_version to 12345. Zeros cause problems. | |
405 | dnl | |
406 | AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [ | |
407 | # If we're not using GNU ld, then there's no point in even trying these | |
408 | # tests. Check for that first. We should have already tested for gld | |
409 | # by now (in libtool), but require it now just to be safe... | |
410 | test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS='' | |
411 | test -z "$OPT_LDFLAGS" && OPT_LDFLAGS='' | |
412 | AC_REQUIRE([AC_PROG_LD]) | |
413 | AC_REQUIRE([AC_PROG_AWK]) | |
414 | ||
415 | # The name set by libtool depends on the version of libtool. Shame on us | |
416 | # for depending on an impl detail, but c'est la vie. Older versions used | |
417 | # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on | |
418 | # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually | |
419 | # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't | |
420 | # set (hence we're using an older libtool), then set it. | |
421 | if test x${with_gnu_ld+set} != xset; then | |
422 | if test x${ac_cv_prog_gnu_ld+set} != xset; then | |
423 | # We got through "ac_require(ac_prog_ld)" and still not set? Huh? | |
424 | with_gnu_ld=no | |
425 | else | |
426 | with_gnu_ld=$ac_cv_prog_gnu_ld | |
427 | fi | |
428 | fi | |
429 | ||
430 | # Start by getting the version number. I think the libtool test already | |
431 | # does some of this, but throws away the result. | |
432 | libat_ld_is_gold=no | |
433 | if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then | |
434 | libat_ld_is_gold=yes | |
435 | fi | |
436 | changequote(,) | |
437 | ldver=`$LD --version 2>/dev/null | | |
438 | 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'` | |
439 | changequote([,]) | |
440 | libat_gnu_ld_version=`echo $ldver | \ | |
441 | $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'` | |
442 | ||
443 | # Set --gc-sections. | |
444 | if test "$with_gnu_ld" = "notbroken"; then | |
445 | # GNU ld it is! Joy and bunny rabbits! | |
446 | ||
447 | # All these tests are for C++; save the language and the compiler flags. | |
448 | # Need to do this so that g++ won't try to link in libstdc++ | |
449 | ac_test_CFLAGS="${CFLAGS+set}" | |
450 | ac_save_CFLAGS="$CFLAGS" | |
451 | CFLAGS='-x c++ -Wl,--gc-sections' | |
452 | ||
453 | # Check for -Wl,--gc-sections | |
454 | # XXX This test is broken at the moment, as symbols required for linking | |
455 | # are now in libsupc++ (not built yet). In addition, this test has | |
456 | # cored on solaris in the past. In addition, --gc-sections doesn't | |
457 | # really work at the moment (keeps on discarding used sections, first | |
458 | # .eh_frame and now some of the glibc sections for iconv). | |
459 | # Bzzzzt. Thanks for playing, maybe next time. | |
460 | AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections]) | |
461 | AC_TRY_RUN([ | |
462 | int main(void) | |
463 | { | |
464 | try { throw 1; } | |
465 | catch (...) { }; | |
466 | return 0; | |
467 | } | |
468 | ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes]) | |
469 | if test "$ac_test_CFLAGS" = set; then | |
470 | CFLAGS="$ac_save_CFLAGS" | |
471 | else | |
472 | # this is the suspicious part | |
473 | CFLAGS='' | |
474 | fi | |
475 | if test "$ac_sectionLDflags" = "yes"; then | |
476 | SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS" | |
477 | fi | |
478 | AC_MSG_RESULT($ac_sectionLDflags) | |
479 | fi | |
480 | ||
481 | # Set linker optimization flags. | |
482 | if test x"$with_gnu_ld" = x"yes"; then | |
483 | OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS" | |
484 | fi | |
485 | ||
486 | AC_SUBST(SECTION_LDFLAGS) | |
487 | AC_SUBST(OPT_LDFLAGS) | |
488 | ]) | |
489 | ||
490 | ||
491 | dnl | |
492 | dnl Add version tags to symbols in shared library (or not), additionally | |
493 | dnl marking other symbols as private/local (or not). | |
494 | dnl | |
495 | dnl --enable-symvers=style adds a version script to the linker call when | |
496 | dnl creating the shared library. The choice of version script is | |
497 | dnl controlled by 'style'. | |
498 | dnl --disable-symvers does not. | |
499 | dnl + Usage: LIBAT_ENABLE_SYMVERS[(DEFAULT)] | |
500 | dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to | |
501 | dnl choose a default style based on linker characteristics. Passing | |
502 | dnl 'no' disables versioning. | |
503 | dnl | |
504 | AC_DEFUN([LIBAT_ENABLE_SYMVERS], [ | |
505 | ||
506 | LIBAT_ENABLE(symvers,yes,[=STYLE], | |
507 | [enables symbol versioning of the shared library], | |
508 | [permit yes|no|gnu*|sun]) | |
509 | ||
510 | # If we never went through the LIBAT_CHECK_LINKER_FEATURES macro, then we | |
511 | # don't know enough about $LD to do tricks... | |
512 | AC_REQUIRE([LIBAT_CHECK_LINKER_FEATURES]) | |
513 | ||
514 | # Turn a 'yes' into a suitable default. | |
515 | if test x$enable_symvers = xyes ; then | |
516 | # FIXME The following test is too strict, in theory. | |
517 | if test $enable_shared = no || test "x$LD" = x; then | |
518 | enable_symvers=no | |
519 | else | |
520 | if test $with_gnu_ld = yes ; then | |
521 | enable_symvers=gnu | |
522 | else | |
523 | case ${target_os} in | |
524 | # Sun symbol versioning exists since Solaris 2.5. | |
525 | solaris2.[[5-9]]* | solaris2.1[[0-9]]*) | |
526 | enable_symvers=sun ;; | |
527 | *) | |
528 | enable_symvers=no ;; | |
529 | esac | |
530 | fi | |
531 | fi | |
532 | fi | |
533 | ||
534 | # Check if 'sun' was requested on non-Solaris 2 platforms. | |
535 | if test x$enable_symvers = xsun ; then | |
536 | case ${target_os} in | |
537 | solaris2*) | |
538 | # All fine. | |
539 | ;; | |
540 | *) | |
541 | # Unlikely to work. | |
542 | AC_MSG_WARN([=== You have requested Sun symbol versioning, but]) | |
543 | AC_MSG_WARN([=== you are not targetting Solaris 2.]) | |
544 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
545 | enable_symvers=no | |
546 | ;; | |
547 | esac | |
548 | fi | |
549 | ||
550 | # Check to see if libgcc_s exists, indicating that shared libgcc is possible. | |
551 | if test $enable_symvers != no; then | |
552 | AC_MSG_CHECKING([for shared libgcc]) | |
553 | ac_save_CFLAGS="$CFLAGS" | |
554 | CFLAGS=' -lgcc_s' | |
555 | AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes, libat_shared_libgcc=no) | |
556 | CFLAGS="$ac_save_CFLAGS" | |
557 | if test $libat_shared_libgcc = no; then | |
558 | cat > conftest.c <<EOF | |
559 | int main (void) { return 0; } | |
560 | EOF | |
561 | changequote(,)dnl | |
562 | libat_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ | |
563 | -shared -shared-libgcc -o conftest.so \ | |
564 | conftest.c -v 2>&1 >/dev/null \ | |
565 | | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'` | |
566 | changequote([,])dnl | |
567 | rm -f conftest.c conftest.so | |
568 | if test x${libat_libgcc_s_suffix+set} = xset; then | |
569 | CFLAGS=" -lgcc_s$libat_libgcc_s_suffix" | |
570 | AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes) | |
571 | CFLAGS="$ac_save_CFLAGS" | |
572 | fi | |
573 | fi | |
574 | AC_MSG_RESULT($libat_shared_libgcc) | |
575 | fi | |
576 | ||
577 | # For GNU ld, we need at least this version. The format is described in | |
578 | # LIBAT_CHECK_LINKER_FEATURES above. | |
579 | libat_min_gnu_ld_version=21400 | |
580 | # XXXXXXXXXXX libat_gnu_ld_version=21390 | |
581 | ||
582 | # Check to see if unspecified "yes" value can win, given results above. | |
583 | # Change "yes" into either "no" or a style name. | |
584 | if test $enable_symvers != no && test $libat_shared_libgcc = yes; then | |
585 | if test $with_gnu_ld = yes; then | |
586 | if test $libat_gnu_ld_version -ge $libat_min_gnu_ld_version ; then | |
587 | enable_symvers=gnu | |
588 | elif test $libat_ld_is_gold = yes ; then | |
589 | enable_symvers=gnu | |
590 | else | |
591 | # The right tools, the right setup, but too old. Fallbacks? | |
592 | AC_MSG_WARN(=== Linker version $libat_gnu_ld_version is too old for) | |
593 | AC_MSG_WARN(=== full symbol versioning support in this release of GCC.) | |
594 | AC_MSG_WARN(=== You would need to upgrade your binutils to version) | |
595 | AC_MSG_WARN(=== $libat_min_gnu_ld_version or later and rebuild GCC.) | |
596 | if test $libat_gnu_ld_version -ge 21200 ; then | |
597 | # Globbing fix is present, proper block support is not. | |
598 | dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.]) | |
599 | dnl enable_symvers=??? | |
600 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
601 | enable_symvers=no | |
602 | else | |
603 | # 2.11 or older. | |
604 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
605 | enable_symvers=no | |
606 | fi | |
607 | fi | |
608 | elif test $enable_symvers = sun; then | |
609 | : All interesting versions of Sun ld support sun style symbol versioning. | |
610 | else | |
611 | # just fail for now | |
612 | AC_MSG_WARN([=== You have requested some kind of symbol versioning, but]) | |
613 | AC_MSG_WARN([=== either you are not using a supported linker, or you are]) | |
614 | AC_MSG_WARN([=== not building a shared libgcc_s (which is required).]) | |
615 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
616 | enable_symvers=no | |
617 | fi | |
618 | fi | |
619 | if test $enable_symvers = gnu; then | |
620 | AC_DEFINE(LIBAT_GNU_SYMBOL_VERSIONING, 1, | |
621 | [Define to 1 if GNU symbol versioning is used for libatomic.]) | |
622 | fi | |
623 | ||
624 | AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB, test $enable_symvers != no) | |
625 | AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu) | |
626 | AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun) | |
627 | AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers) | |
628 | ]) | |
629 | ||
630 | dnl ---------------------------------------------------------------------- | |
631 | sinclude(../libtool.m4) | |
632 | dnl The lines below arrange for aclocal not to bring an installed | |
633 | dnl libtool.m4 into aclocal.m4, while still arranging for automake to | |
634 | dnl add a definition of LIBTOOL to Makefile.in. | |
635 | ifelse(,,,[AC_SUBST(LIBTOOL) | |
636 | AC_DEFUN([AM_PROG_LIBTOOL]) | |
637 | AC_DEFUN([AC_LIBTOOL_DLOPEN]) | |
638 | AC_DEFUN([AC_PROG_LD]) | |
639 | ]) |