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e7f352cc | 1 | # mmap(2) blacklisting. Some platforms provide the mmap library routine |
2 | # but don't support all of the features we need from it. | |
3 | AC_DEFUN([AC_FUNC_MMAP_BLACKLIST], | |
e2f66690 | 4 | [ |
5 | AC_CHECK_HEADER([sys/mman.h], | |
6 | [libffi_header_sys_mman_h=yes], [libffi_header_sys_mman_h=no]) | |
7 | AC_CHECK_FUNC([mmap], [libffi_func_mmap=yes], [libffi_func_mmap=no]) | |
8 | if test "$libffi_header_sys_mman_h" != yes \ | |
9 | || test "$libffi_func_mmap" != yes; then | |
e7f352cc | 10 | ac_cv_func_mmap_file=no |
11 | ac_cv_func_mmap_dev_zero=no | |
12 | ac_cv_func_mmap_anon=no | |
13 | else | |
14 | AC_CACHE_CHECK([whether read-only mmap of a plain file works], | |
15 | ac_cv_func_mmap_file, | |
16 | [# Add a system to this blacklist if | |
17 | # mmap(0, stat_size, PROT_READ, MAP_PRIVATE, fd, 0) doesn't return a | |
18 | # memory area containing the same data that you'd get if you applied | |
19 | # read() to the same fd. The only system known to have a problem here | |
20 | # is VMS, where text files have record structure. | |
21 | case "$host_os" in | |
22 | vms* | ultrix*) | |
23 | ac_cv_func_mmap_file=no ;; | |
24 | *) | |
25 | ac_cv_func_mmap_file=yes;; | |
26 | esac]) | |
27 | AC_CACHE_CHECK([whether mmap from /dev/zero works], | |
28 | ac_cv_func_mmap_dev_zero, | |
29 | [# Add a system to this blacklist if it has mmap() but /dev/zero | |
30 | # does not exist, or if mmapping /dev/zero does not give anonymous | |
31 | # zeroed pages with both the following properties: | |
32 | # 1. If you map N consecutive pages in with one call, and then | |
33 | # unmap any subset of those pages, the pages that were not | |
34 | # explicitly unmapped remain accessible. | |
35 | # 2. If you map two adjacent blocks of memory and then unmap them | |
36 | # both at once, they must both go away. | |
37 | # Systems known to be in this category are Windows (all variants), | |
38 | # VMS, and Darwin. | |
39 | case "$host_os" in | |
40 | vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00) | |
41 | ac_cv_func_mmap_dev_zero=no ;; | |
42 | *) | |
43 | ac_cv_func_mmap_dev_zero=yes;; | |
44 | esac]) | |
45 | ||
46 | # Unlike /dev/zero, the MAP_ANON(YMOUS) defines can be probed for. | |
47 | AC_CACHE_CHECK([for MAP_ANON(YMOUS)], ac_cv_decl_map_anon, | |
48 | [AC_TRY_COMPILE( | |
49 | [#include <sys/types.h> | |
50 | #include <sys/mman.h> | |
51 | #include <unistd.h> | |
52 | ||
53 | #ifndef MAP_ANONYMOUS | |
54 | #define MAP_ANONYMOUS MAP_ANON | |
55 | #endif | |
56 | ], | |
57 | [int n = MAP_ANONYMOUS;], | |
58 | ac_cv_decl_map_anon=yes, | |
59 | ac_cv_decl_map_anon=no)]) | |
60 | ||
61 | if test $ac_cv_decl_map_anon = no; then | |
62 | ac_cv_func_mmap_anon=no | |
63 | else | |
64 | AC_CACHE_CHECK([whether mmap with MAP_ANON(YMOUS) works], | |
65 | ac_cv_func_mmap_anon, | |
66 | [# Add a system to this blacklist if it has mmap() and MAP_ANON or | |
67 | # MAP_ANONYMOUS, but using mmap(..., MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) | |
68 | # doesn't give anonymous zeroed pages with the same properties listed | |
69 | # above for use of /dev/zero. | |
70 | # Systems known to be in this category are Windows, VMS, and SCO Unix. | |
71 | case "$host_os" in | |
72 | vms* | cygwin* | pe | mingw* | sco* | udk* ) | |
73 | ac_cv_func_mmap_anon=no ;; | |
74 | *) | |
75 | ac_cv_func_mmap_anon=yes;; | |
76 | esac]) | |
77 | fi | |
78 | fi | |
79 | ||
80 | if test $ac_cv_func_mmap_file = yes; then | |
81 | AC_DEFINE(HAVE_MMAP_FILE, 1, | |
82 | [Define if read-only mmap of a plain file works.]) | |
83 | fi | |
84 | if test $ac_cv_func_mmap_dev_zero = yes; then | |
85 | AC_DEFINE(HAVE_MMAP_DEV_ZERO, 1, | |
86 | [Define if mmap of /dev/zero works.]) | |
87 | fi | |
88 | if test $ac_cv_func_mmap_anon = yes; then | |
89 | AC_DEFINE(HAVE_MMAP_ANON, 1, | |
90 | [Define if mmap with MAP_ANON(YMOUS) works.]) | |
91 | fi | |
92 | ]) | |
86d5c70d | 93 | |
94 | dnl ---------------------------------------------------------------------- | |
95 | dnl This whole bit snagged from libstdc++-v3, via libatomic. | |
96 | ||
97 | dnl | |
98 | dnl LIBAT_ENABLE | |
99 | dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING) | |
100 | dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c) | |
101 | dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER) | |
102 | dnl | |
103 | dnl See docs/html/17_intro/configury.html#enable for documentation. | |
104 | dnl | |
105 | m4_define([LIBAT_ENABLE],[dnl | |
106 | m4_define([_g_switch],[--enable-$1])dnl | |
107 | m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl | |
108 | AC_ARG_ENABLE($1,_g_help, | |
109 | m4_bmatch([$5], | |
110 | [^permit ], | |
111 | [[ | |
112 | case "$enableval" in | |
113 | m4_bpatsubst([$5],[permit ])) ;; | |
114 | *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;; | |
115 | dnl Idea for future: generate a URL pointing to | |
116 | dnl "onlinedocs/configopts.html#whatever" | |
117 | esac | |
118 | ]], | |
119 | [^$], | |
120 | [[ | |
121 | case "$enableval" in | |
122 | yes|no) ;; | |
123 | *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;; | |
124 | esac | |
125 | ]], | |
126 | [[$5]]), | |
127 | [enable_]m4_bpatsubst([$1],-,_)[=][$2]) | |
128 | m4_undefine([_g_switch])dnl | |
129 | m4_undefine([_g_help])dnl | |
130 | ]) | |
131 | ||
132 | dnl | |
133 | dnl If GNU ld is in use, check to see if tricky linker opts can be used. If | |
134 | dnl the native linker is in use, all variables will be defined to something | |
135 | dnl safe (like an empty string). | |
136 | dnl | |
137 | dnl Defines: | |
138 | dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible | |
139 | dnl OPT_LDFLAGS='-Wl,-O1' if possible | |
140 | dnl LD (as a side effect of testing) | |
141 | dnl Sets: | |
142 | dnl with_gnu_ld | |
143 | dnl libat_ld_is_gold (possibly) | |
144 | dnl libat_gnu_ld_version (possibly) | |
145 | dnl | |
146 | dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will | |
147 | dnl set libat_gnu_ld_version to 12345. Zeros cause problems. | |
148 | dnl | |
149 | AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [ | |
150 | # If we're not using GNU ld, then there's no point in even trying these | |
151 | # tests. Check for that first. We should have already tested for gld | |
152 | # by now (in libtool), but require it now just to be safe... | |
153 | test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS='' | |
154 | test -z "$OPT_LDFLAGS" && OPT_LDFLAGS='' | |
155 | AC_REQUIRE([AC_PROG_LD]) | |
156 | AC_REQUIRE([AC_PROG_AWK]) | |
157 | ||
158 | # The name set by libtool depends on the version of libtool. Shame on us | |
159 | # for depending on an impl detail, but c'est la vie. Older versions used | |
160 | # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on | |
161 | # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually | |
162 | # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't | |
163 | # set (hence we're using an older libtool), then set it. | |
164 | if test x${with_gnu_ld+set} != xset; then | |
165 | if test x${ac_cv_prog_gnu_ld+set} != xset; then | |
166 | # We got through "ac_require(ac_prog_ld)" and still not set? Huh? | |
167 | with_gnu_ld=no | |
168 | else | |
169 | with_gnu_ld=$ac_cv_prog_gnu_ld | |
170 | fi | |
171 | fi | |
172 | ||
173 | # Start by getting the version number. I think the libtool test already | |
174 | # does some of this, but throws away the result. | |
175 | libat_ld_is_gold=no | |
176 | if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then | |
177 | libat_ld_is_gold=yes | |
178 | fi | |
179 | changequote(,) | |
180 | ldver=`$LD --version 2>/dev/null | | |
181 | 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'` | |
182 | changequote([,]) | |
183 | libat_gnu_ld_version=`echo $ldver | \ | |
184 | $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'` | |
185 | ||
186 | # Set --gc-sections. | |
187 | if test "$with_gnu_ld" = "notbroken"; then | |
188 | # GNU ld it is! Joy and bunny rabbits! | |
189 | ||
190 | # All these tests are for C++; save the language and the compiler flags. | |
191 | # Need to do this so that g++ won't try to link in libstdc++ | |
192 | ac_test_CFLAGS="${CFLAGS+set}" | |
193 | ac_save_CFLAGS="$CFLAGS" | |
194 | CFLAGS='-x c++ -Wl,--gc-sections' | |
195 | ||
196 | # Check for -Wl,--gc-sections | |
197 | # XXX This test is broken at the moment, as symbols required for linking | |
198 | # are now in libsupc++ (not built yet). In addition, this test has | |
199 | # cored on solaris in the past. In addition, --gc-sections doesn't | |
200 | # really work at the moment (keeps on discarding used sections, first | |
201 | # .eh_frame and now some of the glibc sections for iconv). | |
202 | # Bzzzzt. Thanks for playing, maybe next time. | |
203 | AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections]) | |
204 | AC_TRY_RUN([ | |
205 | int main(void) | |
206 | { | |
207 | try { throw 1; } | |
208 | catch (...) { }; | |
209 | return 0; | |
210 | } | |
211 | ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes]) | |
212 | if test "$ac_test_CFLAGS" = set; then | |
213 | CFLAGS="$ac_save_CFLAGS" | |
214 | else | |
215 | # this is the suspicious part | |
216 | CFLAGS='' | |
217 | fi | |
218 | if test "$ac_sectionLDflags" = "yes"; then | |
219 | SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS" | |
220 | fi | |
221 | AC_MSG_RESULT($ac_sectionLDflags) | |
222 | fi | |
223 | ||
224 | # Set linker optimization flags. | |
225 | if test x"$with_gnu_ld" = x"yes"; then | |
226 | OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS" | |
227 | fi | |
228 | ||
229 | AC_SUBST(SECTION_LDFLAGS) | |
230 | AC_SUBST(OPT_LDFLAGS) | |
231 | ]) | |
232 | ||
233 | ||
234 | dnl | |
235 | dnl If GNU ld is in use, check to see if tricky linker opts can be used. If | |
236 | dnl the native linker is in use, all variables will be defined to something | |
237 | dnl safe (like an empty string). | |
238 | dnl | |
239 | dnl Defines: | |
240 | dnl SECTION_LDFLAGS='-Wl,--gc-sections' if possible | |
241 | dnl OPT_LDFLAGS='-Wl,-O1' if possible | |
242 | dnl LD (as a side effect of testing) | |
243 | dnl Sets: | |
244 | dnl with_gnu_ld | |
245 | dnl libat_ld_is_gold (possibly) | |
246 | dnl libat_gnu_ld_version (possibly) | |
247 | dnl | |
248 | dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will | |
249 | dnl set libat_gnu_ld_version to 12345. Zeros cause problems. | |
250 | dnl | |
251 | AC_DEFUN([LIBAT_CHECK_LINKER_FEATURES], [ | |
252 | # If we're not using GNU ld, then there's no point in even trying these | |
253 | # tests. Check for that first. We should have already tested for gld | |
254 | # by now (in libtool), but require it now just to be safe... | |
255 | test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS='' | |
256 | test -z "$OPT_LDFLAGS" && OPT_LDFLAGS='' | |
257 | AC_REQUIRE([AC_PROG_LD]) | |
258 | AC_REQUIRE([AC_PROG_AWK]) | |
259 | ||
260 | # The name set by libtool depends on the version of libtool. Shame on us | |
261 | # for depending on an impl detail, but c'est la vie. Older versions used | |
262 | # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on | |
263 | # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually | |
264 | # makes sense). We'll test with_gnu_ld everywhere else, so if that isn't | |
265 | # set (hence we're using an older libtool), then set it. | |
266 | if test x${with_gnu_ld+set} != xset; then | |
267 | if test x${ac_cv_prog_gnu_ld+set} != xset; then | |
268 | # We got through "ac_require(ac_prog_ld)" and still not set? Huh? | |
269 | with_gnu_ld=no | |
270 | else | |
271 | with_gnu_ld=$ac_cv_prog_gnu_ld | |
272 | fi | |
273 | fi | |
274 | ||
275 | # Start by getting the version number. I think the libtool test already | |
276 | # does some of this, but throws away the result. | |
277 | libat_ld_is_gold=no | |
278 | if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then | |
279 | libat_ld_is_gold=yes | |
280 | fi | |
281 | changequote(,) | |
282 | ldver=`$LD --version 2>/dev/null | | |
283 | 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'` | |
284 | changequote([,]) | |
285 | libat_gnu_ld_version=`echo $ldver | \ | |
286 | $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'` | |
287 | ||
288 | # Set --gc-sections. | |
289 | if test "$with_gnu_ld" = "notbroken"; then | |
290 | # GNU ld it is! Joy and bunny rabbits! | |
291 | ||
292 | # All these tests are for C++; save the language and the compiler flags. | |
293 | # Need to do this so that g++ won't try to link in libstdc++ | |
294 | ac_test_CFLAGS="${CFLAGS+set}" | |
295 | ac_save_CFLAGS="$CFLAGS" | |
296 | CFLAGS='-x c++ -Wl,--gc-sections' | |
297 | ||
298 | # Check for -Wl,--gc-sections | |
299 | # XXX This test is broken at the moment, as symbols required for linking | |
300 | # are now in libsupc++ (not built yet). In addition, this test has | |
301 | # cored on solaris in the past. In addition, --gc-sections doesn't | |
302 | # really work at the moment (keeps on discarding used sections, first | |
303 | # .eh_frame and now some of the glibc sections for iconv). | |
304 | # Bzzzzt. Thanks for playing, maybe next time. | |
305 | AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections]) | |
306 | AC_TRY_RUN([ | |
307 | int main(void) | |
308 | { | |
309 | try { throw 1; } | |
310 | catch (...) { }; | |
311 | return 0; | |
312 | } | |
313 | ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes]) | |
314 | if test "$ac_test_CFLAGS" = set; then | |
315 | CFLAGS="$ac_save_CFLAGS" | |
316 | else | |
317 | # this is the suspicious part | |
318 | CFLAGS='' | |
319 | fi | |
320 | if test "$ac_sectionLDflags" = "yes"; then | |
321 | SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS" | |
322 | fi | |
323 | AC_MSG_RESULT($ac_sectionLDflags) | |
324 | fi | |
325 | ||
326 | # Set linker optimization flags. | |
327 | if test x"$with_gnu_ld" = x"yes"; then | |
328 | OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS" | |
329 | fi | |
330 | ||
331 | AC_SUBST(SECTION_LDFLAGS) | |
332 | AC_SUBST(OPT_LDFLAGS) | |
333 | ]) | |
334 | ||
335 | ||
336 | dnl | |
337 | dnl Add version tags to symbols in shared library (or not), additionally | |
338 | dnl marking other symbols as private/local (or not). | |
339 | dnl | |
340 | dnl --enable-symvers=style adds a version script to the linker call when | |
341 | dnl creating the shared library. The choice of version script is | |
342 | dnl controlled by 'style'. | |
343 | dnl --disable-symvers does not. | |
344 | dnl + Usage: LIBAT_ENABLE_SYMVERS[(DEFAULT)] | |
345 | dnl Where DEFAULT is either 'yes' or 'no'. Passing `yes' tries to | |
346 | dnl choose a default style based on linker characteristics. Passing | |
347 | dnl 'no' disables versioning. | |
348 | dnl | |
349 | AC_DEFUN([LIBAT_ENABLE_SYMVERS], [ | |
350 | ||
351 | LIBAT_ENABLE(symvers,yes,[=STYLE], | |
352 | [enables symbol versioning of the shared library], | |
353 | [permit yes|no|gnu*|sun]) | |
354 | ||
355 | # If we never went through the LIBAT_CHECK_LINKER_FEATURES macro, then we | |
356 | # don't know enough about $LD to do tricks... | |
357 | AC_REQUIRE([LIBAT_CHECK_LINKER_FEATURES]) | |
358 | ||
359 | # Turn a 'yes' into a suitable default. | |
360 | if test x$enable_symvers = xyes ; then | |
361 | # FIXME The following test is too strict, in theory. | |
362 | if test $enable_shared = no || test "x$LD" = x; then | |
363 | enable_symvers=no | |
364 | else | |
365 | if test $with_gnu_ld = yes ; then | |
366 | enable_symvers=gnu | |
367 | else | |
368 | case ${target_os} in | |
369 | # Sun symbol versioning exists since Solaris 2.5. | |
370 | solaris2.[[5-9]]* | solaris2.1[[0-9]]*) | |
371 | enable_symvers=sun ;; | |
372 | *) | |
373 | enable_symvers=no ;; | |
374 | esac | |
375 | fi | |
376 | fi | |
377 | fi | |
378 | ||
379 | # Check if 'sun' was requested on non-Solaris 2 platforms. | |
380 | if test x$enable_symvers = xsun ; then | |
381 | case ${target_os} in | |
382 | solaris2*) | |
383 | # All fine. | |
384 | ;; | |
385 | *) | |
386 | # Unlikely to work. | |
387 | AC_MSG_WARN([=== You have requested Sun symbol versioning, but]) | |
388 | AC_MSG_WARN([=== you are not targetting Solaris 2.]) | |
389 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
390 | enable_symvers=no | |
391 | ;; | |
392 | esac | |
393 | fi | |
394 | ||
395 | # Check to see if libgcc_s exists, indicating that shared libgcc is possible. | |
396 | if test $enable_symvers != no; then | |
397 | AC_MSG_CHECKING([for shared libgcc]) | |
398 | ac_save_CFLAGS="$CFLAGS" | |
399 | CFLAGS=' -lgcc_s' | |
400 | AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes, libat_shared_libgcc=no) | |
401 | CFLAGS="$ac_save_CFLAGS" | |
402 | if test $libat_shared_libgcc = no; then | |
403 | cat > conftest.c <<EOF | |
404 | int main (void) { return 0; } | |
405 | EOF | |
406 | changequote(,)dnl | |
407 | libat_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ | |
408 | -shared -shared-libgcc -o conftest.so \ | |
409 | conftest.c -v 2>&1 >/dev/null \ | |
410 | | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'` | |
411 | changequote([,])dnl | |
412 | rm -f conftest.c conftest.so | |
413 | if test x${libat_libgcc_s_suffix+set} = xset; then | |
414 | CFLAGS=" -lgcc_s$libat_libgcc_s_suffix" | |
415 | AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes) | |
416 | CFLAGS="$ac_save_CFLAGS" | |
417 | fi | |
418 | fi | |
419 | AC_MSG_RESULT($libat_shared_libgcc) | |
420 | fi | |
421 | ||
422 | # For GNU ld, we need at least this version. The format is described in | |
423 | # LIBAT_CHECK_LINKER_FEATURES above. | |
424 | libat_min_gnu_ld_version=21400 | |
425 | # XXXXXXXXXXX libat_gnu_ld_version=21390 | |
426 | ||
427 | # Check to see if unspecified "yes" value can win, given results above. | |
428 | # Change "yes" into either "no" or a style name. | |
429 | if test $enable_symvers != no && test $libat_shared_libgcc = yes; then | |
430 | if test $with_gnu_ld = yes; then | |
431 | if test $libat_gnu_ld_version -ge $libat_min_gnu_ld_version ; then | |
432 | enable_symvers=gnu | |
433 | elif test $libat_ld_is_gold = yes ; then | |
434 | enable_symvers=gnu | |
435 | else | |
436 | # The right tools, the right setup, but too old. Fallbacks? | |
437 | AC_MSG_WARN(=== Linker version $libat_gnu_ld_version is too old for) | |
438 | AC_MSG_WARN(=== full symbol versioning support in this release of GCC.) | |
439 | AC_MSG_WARN(=== You would need to upgrade your binutils to version) | |
440 | AC_MSG_WARN(=== $libat_min_gnu_ld_version or later and rebuild GCC.) | |
441 | if test $libat_gnu_ld_version -ge 21200 ; then | |
442 | # Globbing fix is present, proper block support is not. | |
443 | dnl AC_MSG_WARN([=== Dude, you are soooo close. Maybe we can fake it.]) | |
444 | dnl enable_symvers=??? | |
445 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
446 | enable_symvers=no | |
447 | else | |
448 | # 2.11 or older. | |
449 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
450 | enable_symvers=no | |
451 | fi | |
452 | fi | |
453 | elif test $enable_symvers = sun; then | |
454 | : All interesting versions of Sun ld support sun style symbol versioning. | |
455 | else | |
456 | # just fail for now | |
457 | AC_MSG_WARN([=== You have requested some kind of symbol versioning, but]) | |
458 | AC_MSG_WARN([=== either you are not using a supported linker, or you are]) | |
459 | AC_MSG_WARN([=== not building a shared libgcc_s (which is required).]) | |
460 | AC_MSG_WARN([=== Symbol versioning will be disabled.]) | |
461 | enable_symvers=no | |
462 | fi | |
463 | fi | |
464 | if test $enable_symvers = gnu; then | |
465 | AC_DEFINE(LIBAT_GNU_SYMBOL_VERSIONING, 1, | |
466 | [Define to 1 if GNU symbol versioning is used for libatomic.]) | |
467 | fi | |
468 | ||
469 | AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB, test $enable_symvers != no) | |
470 | AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_GNU, test $enable_symvers = gnu) | |
471 | AM_CONDITIONAL(LIBAT_BUILD_VERSIONED_SHLIB_SUN, test $enable_symvers = sun) | |
472 | AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers) | |
473 | ]) |