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# 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])
])
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