| dnl Check whether the target supports hidden visibility. |
| AC_DEFUN([GCC_CHECK_ATTRIBUTE_VISIBILITY], [ |
| AC_CACHE_CHECK([whether the target supports hidden visibility], |
| gcc_cv_have_attribute_visibility, [ |
| save_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS -Werror" |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[void __attribute__((visibility("hidden"))) foo(void) { }]], [])], |
| gcc_cv_have_attribute_visibility=yes, |
| gcc_cv_have_attribute_visibility=no) |
| CFLAGS="$save_CFLAGS"]) |
| if test $gcc_cv_have_attribute_visibility = yes; then |
| AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1, |
| [Define to 1 if the target supports __attribute__((visibility(...))).]) |
| fi]) |
