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111
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1 # mmap(2) blacklisting. Some platforms provide the mmap library routine
|
|
|
2 # but don't support all of the features we need from it.
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3 AC_DEFUN([AC_FUNC_MMAP_BLACKLIST],
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4 [
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5 AC_CHECK_HEADER([sys/mman.h],
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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])
|
|
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8 if test "$libffi_header_sys_mman_h" != yes \
|
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9 || test "$libffi_func_mmap" != yes; then
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10 ac_cv_func_mmap_file=no
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11 ac_cv_func_mmap_dev_zero=no
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12 ac_cv_func_mmap_anon=no
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13 else
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14 AC_CACHE_CHECK([whether read-only mmap of a plain file works],
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15 ac_cv_func_mmap_file,
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16 [# Add a system to this blacklist if
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17 # mmap(0, stat_size, PROT_READ, MAP_PRIVATE, fd, 0) doesn't return a
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18 # memory area containing the same data that you'd get if you applied
|
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|
19 # read() to the same fd. The only system known to have a problem here
|
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20 # is VMS, where text files have record structure.
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21 case "$host_os" in
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22 vms* | ultrix*)
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23 ac_cv_func_mmap_file=no ;;
|
|
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24 *)
|
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25 ac_cv_func_mmap_file=yes;;
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26 esac])
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27 AC_CACHE_CHECK([whether mmap from /dev/zero works],
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28 ac_cv_func_mmap_dev_zero,
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29 [# Add a system to this blacklist if it has mmap() but /dev/zero
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30 # does not exist, or if mmapping /dev/zero does not give anonymous
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31 # zeroed pages with both the following properties:
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32 # 1. If you map N consecutive pages in with one call, and then
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33 # unmap any subset of those pages, the pages that were not
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34 # explicitly unmapped remain accessible.
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35 # 2. If you map two adjacent blocks of memory and then unmap them
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36 # both at once, they must both go away.
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37 # Systems known to be in this category are Windows (all variants),
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38 # VMS, and Darwin.
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39 case "$host_os" in
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40 vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)
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41 ac_cv_func_mmap_dev_zero=no ;;
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42 *)
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43 ac_cv_func_mmap_dev_zero=yes;;
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44 esac])
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45
|
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46 # Unlike /dev/zero, the MAP_ANON(YMOUS) defines can be probed for.
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47 AC_CACHE_CHECK([for MAP_ANON(YMOUS)], ac_cv_decl_map_anon,
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48 [AC_TRY_COMPILE(
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49 [#include <sys/types.h>
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50 #include <sys/mman.h>
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51 #include <unistd.h>
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52
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53 #ifndef MAP_ANONYMOUS
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54 #define MAP_ANONYMOUS MAP_ANON
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55 #endif
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56 ],
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57 [int n = MAP_ANONYMOUS;],
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58 ac_cv_decl_map_anon=yes,
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59 ac_cv_decl_map_anon=no)])
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60
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61 if test $ac_cv_decl_map_anon = no; then
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62 ac_cv_func_mmap_anon=no
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63 else
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64 AC_CACHE_CHECK([whether mmap with MAP_ANON(YMOUS) works],
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65 ac_cv_func_mmap_anon,
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66 [# Add a system to this blacklist if it has mmap() and MAP_ANON or
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67 # MAP_ANONYMOUS, but using mmap(..., MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
|
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68 # doesn't give anonymous zeroed pages with the same properties listed
|
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69 # above for use of /dev/zero.
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70 # Systems known to be in this category are Windows, VMS, and SCO Unix.
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71 case "$host_os" in
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72 vms* | cygwin* | pe | mingw* | sco* | udk* )
|
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73 ac_cv_func_mmap_anon=no ;;
|
|
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74 *)
|
|
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75 ac_cv_func_mmap_anon=yes;;
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|
|
76 esac])
|
|
|
77 fi
|
|
|
78 fi
|
|
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79
|
|
|
80 if test $ac_cv_func_mmap_file = yes; then
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81 AC_DEFINE(HAVE_MMAP_FILE, 1,
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82 [Define if read-only mmap of a plain file works.])
|
|
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83 fi
|
|
|
84 if test $ac_cv_func_mmap_dev_zero = yes; then
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85 AC_DEFINE(HAVE_MMAP_DEV_ZERO, 1,
|
|
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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 ])
|
|
|
93
|
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|
94 dnl ----------------------------------------------------------------------
|
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95 dnl This whole bit snagged from libstdc++-v3, via libatomic.
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96
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97 dnl
|
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98 dnl LIBAT_ENABLE
|
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99 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
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100 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
|
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|
101 dnl (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
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|
102 dnl
|
|
|
103 dnl See docs/html/17_intro/configury.html#enable for documentation.
|
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104 dnl
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|
105 m4_define([LIBAT_ENABLE],[dnl
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|
|
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 |
|
|
145
|
181 sed -e 's/[. ][0-9]\{8\}$//;s/.* \([^ ]\{1,\}\)$/\1/; q'`
|
|
111
|
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 |
|
|
145
|
283 sed -e 's/[. ][0-9]\{8\}$//;s/.* \([^ ]\{1,\}\)$/\1/; q'`
|
|
111
|
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],
|
|
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352 [enables symbol versioning of the shared library],
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353 [permit yes|no|gnu*|sun])
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354
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355 # If we never went through the LIBAT_CHECK_LINKER_FEATURES macro, then we
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356 # don't know enough about $LD to do tricks...
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357 AC_REQUIRE([LIBAT_CHECK_LINKER_FEATURES])
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358
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359 # Turn a 'yes' into a suitable default.
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360 if test x$enable_symvers = xyes ; then
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361 # FIXME The following test is too strict, in theory.
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362 if test $enable_shared = no || test "x$LD" = x; then
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363 enable_symvers=no
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364 else
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365 if test $with_gnu_ld = yes ; then
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366 enable_symvers=gnu
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367 else
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368 case ${target_os} in
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369 # Sun symbol versioning exists since Solaris 2.5.
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370 solaris2.[[5-9]]* | solaris2.1[[0-9]]*)
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371 enable_symvers=sun ;;
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372 *)
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373 enable_symvers=no ;;
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374 esac
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375 fi
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376 fi
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377 fi
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378
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379 # Check if 'sun' was requested on non-Solaris 2 platforms.
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380 if test x$enable_symvers = xsun ; then
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381 case ${target_os} in
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382 solaris2*)
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383 # All fine.
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384 ;;
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385 *)
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386 # Unlikely to work.
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387 AC_MSG_WARN([=== You have requested Sun symbol versioning, but])
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388 AC_MSG_WARN([=== you are not targetting Solaris 2.])
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389 AC_MSG_WARN([=== Symbol versioning will be disabled.])
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390 enable_symvers=no
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391 ;;
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392 esac
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393 fi
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394
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395 # Check to see if libgcc_s exists, indicating that shared libgcc is possible.
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396 if test $enable_symvers != no; then
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397 AC_MSG_CHECKING([for shared libgcc])
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398 ac_save_CFLAGS="$CFLAGS"
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399 CFLAGS=' -lgcc_s'
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400 AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes, libat_shared_libgcc=no)
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401 CFLAGS="$ac_save_CFLAGS"
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402 if test $libat_shared_libgcc = no; then
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403 cat > conftest.c <<EOF
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404 int main (void) { return 0; }
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405 EOF
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406 changequote(,)dnl
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407 libat_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
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408 -shared -shared-libgcc -o conftest.so \
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409 conftest.c -v 2>&1 >/dev/null \
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410 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
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411 changequote([,])dnl
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412 rm -f conftest.c conftest.so
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413 if test x${libat_libgcc_s_suffix+set} = xset; then
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414 CFLAGS=" -lgcc_s$libat_libgcc_s_suffix"
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415 AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes)
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416 CFLAGS="$ac_save_CFLAGS"
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417 fi
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418 fi
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419 AC_MSG_RESULT($libat_shared_libgcc)
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420 fi
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421
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422 # For GNU ld, we need at least this version. The format is described in
|
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423 # LIBAT_CHECK_LINKER_FEATURES above.
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424 libat_min_gnu_ld_version=21400
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425 # XXXXXXXXXXX libat_gnu_ld_version=21390
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426
|
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427 # Check to see if unspecified "yes" value can win, given results above.
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|
|
428 # Change "yes" into either "no" or a style name.
|
|
|
429 if test $enable_symvers != no && test $libat_shared_libgcc = yes; then
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430 if test $with_gnu_ld = yes; then
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|
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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
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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 ])
|
