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| author | Jörg Frings-Fürst <debian@jff-webhosting.net> | 2015-02-04 14:09:54 +0100 |
|---|---|---|
| committer | Jörg Frings-Fürst <debian@jff-webhosting.net> | 2015-02-04 14:09:54 +0100 |
| commit | bd82d030011cd8b9655e5ded6b6df9343b42a6bd (patch) | |
| tree | de82d886dfea0cb7dbb6e80436218a25cb211bc3 /m4/gcc4_visibility.m4 | |
Imported Upstream version 3.22upstream/3.22
Diffstat (limited to 'm4/gcc4_visibility.m4')
| -rw-r--r-- | m4/gcc4_visibility.m4 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/m4/gcc4_visibility.m4 b/m4/gcc4_visibility.m4 new file mode 100644 index 0000000..708d42b --- /dev/null +++ b/m4/gcc4_visibility.m4 @@ -0,0 +1,21 @@ + +# GCC 4.x -fvisibility=hidden + +AC_DEFUN([CHECK_GCC_FVISIBILITY], [ + AC_LANG_PUSH([C]) + saved_CFLAGS="$CFLAGS" + CFLAGS="$saved_CFLAGS -fvisibility=hidden" + AC_CACHE_CHECK([whether compiler accepts -fvisibility=hidden], + [ac_cv_fvisibility_hidden], AC_COMPILE_IFELSE( + [AC_LANG_SOURCE()], + [ac_cv_fvisibility_hidden=yes], + [ac_cv_fvisibility_hidden=no] + )) + if test "$ac_cv_fvisibility_hidden" = "yes"; then + AC_DEFINE([HAVE_VISIBILITY_HIDDEN], [1], + [True if compiler supports -fvisibility=hidden]) + visibility_CFLAGS="-fvisibility=hidden" + fi + CFLAGS="$saved_CFLAGS" + AC_LANG_POP([C]) +]) |