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| author | Brian J. Tarricone <brian@tarricone.org> | 2009-09-18 16:16:13 -0700 |
|---|---|---|
| committer | Brian J. Tarricone <brian@tarricone.org> | 2009-09-18 16:16:13 -0700 |
| commit | 104a024b94ae87ee87aedefd21b140505220a2c4 (patch) | |
| tree | 87a02a3b03d48b87f83b094bfb6f58ec76a1e311 /m4macros | |
| parent | 806ee07598a912c3e92498e98c29b35d29ea65ac (diff) | |
| download | xfce4-dev-tools-104a024b94ae87ee87aedefd21b140505220a2c4.tar.gz | |
add XDT_FEATURE_VISIBILITY
Diffstat (limited to 'm4macros')
| -rw-r--r-- | m4macros/xdt-features.m4 | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/m4macros/xdt-features.m4 b/m4macros/xdt-features.m4 index 9a35926..c2d2cd5 100644 --- a/m4macros/xdt-features.m4 +++ b/m4macros/xdt-features.m4 @@ -109,6 +109,57 @@ AC_HELP_STRING([--disable-debug], [Include no debugging support [default]]), ]) +dnl XDT_FEATURE_VISIBILITY() +dnl +dnl Checks to see if the compiler supports the 'visibility' attribute +dnl If so, adds -DHAVE_GNUC_VISIBILTY to CPPFLAGS. Also sets the +dnl automake conditional HAVE_GNUC_VISIBILITY. +dnl +AC_DEFUN([XDT_FEATURE_VISIBILITY], +[ + AC_ARG_ENABLE([visibility], + AC_HELP_STRING([--disable-visibility], + [Don't use ELF visibility attributes]), + [], [enable_visibility=yes]) + have_gnuc_visibility=no + if test "x$enable_visibility" != "xno"; then + XDT_SUPPORTED_FLAGS([xdt_vis_test_cflags], [-Wall -Werror -Wno-unused-parameter]) + saved_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $xdt_vis_test_cflags" + AC_MSG_CHECKING([whether $CC supports the GNUC visibility attribute]) + AC_COMPILE_IFELSE(AC_LANG_SOURCE( + [ + void test_default (void); + void test_hidden (void); + + void __attribute__ ((visibility("default"))) test_default (void) {} + void __attribute__ ((visibility("hidden"))) test_hidden (void) {} + + int main (int argc, char **argv) { + test_default (); + test_hidden (); + return 0; + } + ]), + [ + have_gnuc_visibility=yes + AC_MSG_RESULT([yes]) + ], + [ + AC_MSG_RESULT([no]) + ]) + CFLAGS="$saved_CFLAGS" + fi + + if test "x$have_gnuc_visibility" = "xyes"; then + CPPFLAGS="$CPPFLAGS -DHAVE_GNUC_VISIBILITY" + XDT_SUPPORTED_FLAGS([xdt_vis_hidden_cflags], [-fvisibility=hidden]) + CFLAGS="$CFLAGS $xdt_vis_hidden_cflags" + fi + + AM_CONDITIONAL([HAVE_GNUC_VISIBILITY], [test "x$have_gnuc_visibility" = "xyes"]) +]) + dnl BM_DEBUG_SUPPORT() dnl |