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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [libgomp/] [acinclude.m4] - Blame information for rev 826

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Line No. Rev Author Line
1 273 jeremybenn
dnl ----------------------------------------------------------------------
2
dnl This whole bit snagged from libgfortran.
3
 
4
dnl Check whether the target supports __sync_*_compare_and_swap.
5
AC_DEFUN([LIBGOMP_CHECK_SYNC_BUILTINS], [
6
  AC_CACHE_CHECK([whether the target supports __sync_*_compare_and_swap],
7
                 libgomp_cv_have_sync_builtins, [
8
  AC_TRY_LINK([], [int foo, bar; bar = __sync_val_compare_and_swap(&foo, 0, 1);],
9
              libgomp_cv_have_sync_builtins=yes, libgomp_cv_have_sync_builtins=no)])
10
  if test $libgomp_cv_have_sync_builtins = yes; then
11
    AC_DEFINE(HAVE_SYNC_BUILTINS, 1,
12
              [Define to 1 if the target supports __sync_*_compare_and_swap])
13
  fi])
14
 
15
dnl Check whether the target supports hidden visibility.
16
AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_VISIBILITY], [
17
  AC_CACHE_CHECK([whether the target supports hidden visibility],
18
                 libgomp_cv_have_attribute_visibility, [
19
  save_CFLAGS="$CFLAGS"
20
  CFLAGS="$CFLAGS -Werror"
21
  AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
22
                 [], libgomp_cv_have_attribute_visibility=yes,
23
                 libgomp_cv_have_attribute_visibility=no)
24
  CFLAGS="$save_CFLAGS"])
25
  if test $libgomp_cv_have_attribute_visibility = yes; then
26
    AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
27
      [Define to 1 if the target supports __attribute__((visibility(...))).])
28
  fi])
29
 
30
dnl Check whether the target supports dllexport
31
AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_DLLEXPORT], [
32
  AC_CACHE_CHECK([whether the target supports dllexport],
33
                 libgomp_cv_have_attribute_dllexport, [
34
  save_CFLAGS="$CFLAGS"
35
  CFLAGS="$CFLAGS -Werror"
36
  AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }],
37
                 [], libgomp_cv_have_attribute_dllexport=yes,
38
                 libgomp_cv_have_attribute_dllexport=no)
39
  CFLAGS="$save_CFLAGS"])
40
  if test $libgomp_cv_have_attribute_dllexport = yes; then
41
    AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,
42
      [Define to 1 if the target supports __attribute__((dllexport)).])
43
  fi])
44
 
45
dnl Check whether the target supports symbol aliases.
46
AC_DEFUN([LIBGOMP_CHECK_ATTRIBUTE_ALIAS], [
47
  AC_CACHE_CHECK([whether the target supports symbol aliases],
48
                 libgomp_cv_have_attribute_alias, [
49
  AC_TRY_LINK([
50
void foo(void) { }
51
extern void bar(void) __attribute__((alias("foo")));],
52
    [bar();], libgomp_cv_have_attribute_alias=yes, libgomp_cv_have_attribute_alias=no)])
53
  if test $libgomp_cv_have_attribute_alias = yes; then
54
    AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
55
      [Define to 1 if the target supports __attribute__((alias(...))).])
56
  fi])
57
 
58
sinclude(../libtool.m4)
59
dnl The lines below arrange for aclocal not to bring an installed
60
dnl libtool.m4 into aclocal.m4, while still arranging for automake to
61
dnl add a definition of LIBTOOL to Makefile.in.
62
ifelse(,,,[AC_SUBST(LIBTOOL)
63
AC_DEFUN([AM_PROG_LIBTOOL])
64
AC_DEFUN([AC_LIBTOOL_DLOPEN])
65
AC_DEFUN([AC_PROG_LD])
66
])
67
 
68
dnl ----------------------------------------------------------------------
69
dnl This whole bit snagged from libstdc++-v3.
70
 
71
dnl
72
dnl LIBGOMP_ENABLE
73
dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING)
74
dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, permit a|b|c)
75
dnl    (FEATURE, DEFAULT, HELP-ARG, HELP-STRING, SHELL-CODE-HANDLER)
76
dnl
77
dnl See docs/html/17_intro/configury.html#enable for documentation.
78
dnl
79
m4_define([LIBGOMP_ENABLE],[dnl
80
m4_define([_g_switch],[--enable-$1])dnl
81
m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
82
 AC_ARG_ENABLE($1,_g_help,
83
  m4_bmatch([$5],
84
   [^permit ],
85
     [[
86
      case "$enableval" in
87
       m4_bpatsubst([$5],[permit ])) ;;
88
       *) AC_MSG_ERROR(Unknown argument to enable/disable $1) ;;
89
          dnl Idea for future:  generate a URL pointing to
90
          dnl "onlinedocs/configopts.html#whatever"
91
      esac
92
     ]],
93
   [^$],
94
     [[
95
      case "$enableval" in
96
       yes|no) ;;
97
       *) AC_MSG_ERROR(Argument to enable/disable $1 must be yes or no) ;;
98
      esac
99
     ]],
100
   [[$5]]),
101
  [enable_]m4_bpatsubst([$1],-,_)[=][$2])
102
m4_undefine([_g_switch])dnl
103
m4_undefine([_g_help])dnl
104
])
105
 
106
 
107
dnl
108
dnl If GNU ld is in use, check to see if tricky linker opts can be used.  If
109
dnl the native linker is in use, all variables will be defined to something
110
dnl safe (like an empty string).
111
dnl
112
dnl Defines:
113
dnl  SECTION_LDFLAGS='-Wl,--gc-sections' if possible
114
dnl  OPT_LDFLAGS='-Wl,-O1' if possible
115
dnl  LD (as a side effect of testing)
116
dnl Sets:
117
dnl  with_gnu_ld
118
dnl  libgomp_ld_is_gold (possibly)
119
dnl  libgomp_gnu_ld_version (possibly)
120
dnl
121
dnl The last will be a single integer, e.g., version 1.23.45.0.67.89 will
122
dnl set libgomp_gnu_ld_version to 12345.  Zeros cause problems.
123
dnl
124
AC_DEFUN([LIBGOMP_CHECK_LINKER_FEATURES], [
125
  # If we're not using GNU ld, then there's no point in even trying these
126
  # tests.  Check for that first.  We should have already tested for gld
127
  # by now (in libtool), but require it now just to be safe...
128
  test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
129
  test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
130
  AC_REQUIRE([AC_PROG_LD])
131
  AC_REQUIRE([AC_PROG_AWK])
132
 
133
  # The name set by libtool depends on the version of libtool.  Shame on us
134
  # for depending on an impl detail, but c'est la vie.  Older versions used
135
  # ac_cv_prog_gnu_ld, but now it's lt_cv_prog_gnu_ld, and is copied back on
136
  # top of with_gnu_ld (which is also set by --with-gnu-ld, so that actually
137
  # makes sense).  We'll test with_gnu_ld everywhere else, so if that isn't
138
  # set (hence we're using an older libtool), then set it.
139
  if test x${with_gnu_ld+set} != xset; then
140
    if test x${ac_cv_prog_gnu_ld+set} != xset; then
141
      # We got through "ac_require(ac_prog_ld)" and still not set?  Huh?
142
      with_gnu_ld=no
143
    else
144
      with_gnu_ld=$ac_cv_prog_gnu_ld
145
    fi
146
  fi
147
 
148
  # Start by getting the version number.  I think the libtool test already
149
  # does some of this, but throws away the result.
150
  libgomp_ld_is_gold=no
151
  if $LD --version 2>/dev/null | grep 'GNU gold'> /dev/null 2>&1; then
152
    libgomp_ld_is_gold=yes
153
  fi
154
  changequote(,)
155
  ldver=`$LD --version 2>/dev/null |
156
         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'`
157
  changequote([,])
158
  libgomp_gnu_ld_version=`echo $ldver | \
159
         $AWK -F. '{ if (NF<3) [$]3=0; print ([$]1*100+[$]2)*100+[$]3 }'`
160
 
161
  # Set --gc-sections.
162
  if test "$with_gnu_ld" = "notbroken"; then
163
    # GNU ld it is!  Joy and bunny rabbits!
164
 
165
    # All these tests are for C++; save the language and the compiler flags.
166
    # Need to do this so that g++ won't try to link in libstdc++
167
    ac_test_CFLAGS="${CFLAGS+set}"
168
    ac_save_CFLAGS="$CFLAGS"
169
    CFLAGS='-x c++  -Wl,--gc-sections'
170
 
171
    # Check for -Wl,--gc-sections
172
    # XXX This test is broken at the moment, as symbols required for linking
173
    # are now in libsupc++ (not built yet).  In addition, this test has
174
    # cored on solaris in the past.  In addition, --gc-sections doesn't
175
    # really work at the moment (keeps on discarding used sections, first
176
    # .eh_frame and now some of the glibc sections for iconv).
177
    # Bzzzzt.  Thanks for playing, maybe next time.
178
    AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
179
    AC_TRY_RUN([
180
     int main(void)
181
     {
182
       try { throw 1; }
183
       catch (...) { };
184
       return 0;
185
     }
186
    ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
187
    if test "$ac_test_CFLAGS" = set; then
188
      CFLAGS="$ac_save_CFLAGS"
189
    else
190
      # this is the suspicious part
191
      CFLAGS=''
192
    fi
193
    if test "$ac_sectionLDflags" = "yes"; then
194
      SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
195
    fi
196
    AC_MSG_RESULT($ac_sectionLDflags)
197
  fi
198
 
199
  # Set linker optimization flags.
200
  if test x"$with_gnu_ld" = x"yes"; then
201
    OPT_LDFLAGS="-Wl,-O1 $OPT_LDFLAGS"
202
  fi
203
 
204
  AC_SUBST(SECTION_LDFLAGS)
205
  AC_SUBST(OPT_LDFLAGS)
206
])
207
 
208
 
209
dnl
210
dnl Add version tags to symbols in shared library (or not), additionally
211
dnl marking other symbols as private/local (or not).
212
dnl
213
dnl --enable-symvers=style adds a version script to the linker call when
214
dnl       creating the shared library.  The choice of version script is
215
dnl       controlled by 'style'.
216
dnl --disable-symvers does not.
217
dnl  +  Usage:  LIBGOMP_ENABLE_SYMVERS[(DEFAULT)]
218
dnl       Where DEFAULT is either 'yes' or 'no'.  Passing `yes' tries to
219
dnl       choose a default style based on linker characteristics.  Passing
220
dnl       'no' disables versioning.
221
dnl
222
AC_DEFUN([LIBGOMP_ENABLE_SYMVERS], [
223
 
224
LIBGOMP_ENABLE(symvers,yes,[=STYLE],
225
  [enables symbol versioning of the shared library],
226
  [permit yes|no|gnu])
227
 
228
# If we never went through the LIBGOMP_CHECK_LINKER_FEATURES macro, then we
229
# don't know enough about $LD to do tricks...
230
AC_REQUIRE([LIBGOMP_CHECK_LINKER_FEATURES])
231
# FIXME  The following test is too strict, in theory.
232
if test $enable_shared = no ||
233
        test "x$LD" = x ||
234
        test x$libgomp_gnu_ld_version = x; then
235
  enable_symvers=no
236
fi
237
 
238
# Check to see if libgcc_s exists, indicating that shared libgcc is possible.
239
if test $enable_symvers != no; then
240
  AC_MSG_CHECKING([for shared libgcc])
241
  ac_save_CFLAGS="$CFLAGS"
242
  CFLAGS=' -lgcc_s'
243
  AC_TRY_LINK(, [return 0;], libgomp_shared_libgcc=yes, libgomp_shared_libgcc=no)
244
  CFLAGS="$ac_save_CFLAGS"
245
  if test $libgomp_shared_libgcc = no; then
246
    cat > conftest.c <<EOF
247
int main (void) { return 0; }
248
EOF
249
changequote(,)dnl
250
    libgomp_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
251
                             -shared -shared-libgcc -o conftest.so \
252
                             conftest.c -v 2>&1 >/dev/null \
253
                             | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
254
changequote([,])dnl
255
    rm -f conftest.c conftest.so
256
    if test x${libgomp_libgcc_s_suffix+set} = xset; then
257
      CFLAGS=" -lgcc_s$libgomp_libgcc_s_suffix"
258
      AC_TRY_LINK(, [return 0;], libgomp_shared_libgcc=yes)
259
      CFLAGS="$ac_save_CFLAGS"
260
    fi
261
  fi
262
  AC_MSG_RESULT($libgomp_shared_libgcc)
263
fi
264
 
265
# For GNU ld, we need at least this version.  The format is described in
266
# LIBGOMP_CHECK_LINKER_FEATURES above.
267
libgomp_min_gnu_ld_version=21400
268
# XXXXXXXXXXX libgomp_gnu_ld_version=21390
269
 
270
# Check to see if unspecified "yes" value can win, given results above.
271
# Change "yes" into either "no" or a style name.
272
if test $enable_symvers = yes; then
273
  if test $with_gnu_ld = yes &&
274
     test $libgomp_shared_libgcc = yes;
275
  then
276
    if test $libgomp_gnu_ld_version -ge $libgomp_min_gnu_ld_version ; then
277
      enable_symvers=gnu
278
    elif test $libgomp_ld_is_gold = yes ; then
279
      enable_symvers=gnu
280
    else
281
      # The right tools, the right setup, but too old.  Fallbacks?
282
      AC_MSG_WARN(=== Linker version $libgomp_gnu_ld_version is too old for)
283
      AC_MSG_WARN(=== full symbol versioning support in this release of GCC.)
284
      AC_MSG_WARN(=== You would need to upgrade your binutils to version)
285
      AC_MSG_WARN(=== $libgomp_min_gnu_ld_version or later and rebuild GCC.)
286
      if test $libgomp_gnu_ld_version -ge 21200 ; then
287
        # Globbing fix is present, proper block support is not.
288
        dnl AC_MSG_WARN([=== Dude, you are soooo close.  Maybe we can fake it.])
289
        dnl enable_symvers=???
290
        AC_MSG_WARN([=== Symbol versioning will be disabled.])
291
        enable_symvers=no
292
      else
293
        # 2.11 or older.
294
        AC_MSG_WARN([=== Symbol versioning will be disabled.])
295
        enable_symvers=no
296
      fi
297
    fi
298
  else
299
    # just fail for now
300
    AC_MSG_WARN([=== You have requested some kind of symbol versioning, but])
301
    AC_MSG_WARN([=== either you are not using a supported linker, or you are])
302
    AC_MSG_WARN([=== not building a shared libgcc_s (which is required).])
303
    AC_MSG_WARN([=== Symbol versioning will be disabled.])
304
    enable_symvers=no
305
  fi
306
fi
307
 
308
AC_CACHE_CHECK([whether the target supports .symver directive],
309
               libgomp_cv_have_as_symver_directive, [
310
  AC_TRY_COMPILE([void foo (void); __asm (".symver foo, bar@SYMVER");],
311
                 [], libgomp_cv_have_as_symver_directive=yes,
312
                 libgomp_cv_have_as_symver_directive=no)])
313
if test $libgomp_cv_have_as_symver_directive = yes; then
314
  AC_DEFINE(HAVE_AS_SYMVER_DIRECTIVE, 1,
315
    [Define to 1 if the target assembler supports .symver directive.])
316
fi
317
 
318
AM_CONDITIONAL(LIBGOMP_BUILD_VERSIONED_SHLIB, test $enable_symvers != no)
319
AC_MSG_NOTICE(versioning on shared library symbols is $enable_symvers)
320
])

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