+# Check for the visibility flags
+ATK_HIDDEN_VISIBILITY_CFLAGS=""
+case "$host" in
+ *-*-mingw*)
+ dnl on mingw32 we do -fvisibility=hidden and __declspec(dllexport)
+ AC_DEFINE([_ATK_EXTERN], [__attribute__((visibility("default"))) __declspec(dllexport) extern],
+ [defines how to decorate public symbols while building])
+ CFLAGS="${CFLAGS} -fvisibility=hidden"
+ ;;
+ *)
+ dnl on other compilers, check if we can do -fvisibility=hidden
+ SAVED_CFLAGS="${CFLAGS}"
+ CFLAGS="-fvisibility=hidden"
+ AC_MSG_CHECKING([for -fvisibility=hidden compiler flag])
+ AC_TRY_COMPILE([], [int main (void) { return 0; }],
+ AC_MSG_RESULT(yes)
+ enable_fvisibility_hidden=yes,
+ AC_MSG_RESULT(no)
+ enable_fvisibility_hidden=no)
+ CFLAGS="${SAVED_CFLAGS}"
+
+ AS_IF([test "${enable_fvisibility_hidden}" = "yes"], [
+ AC_DEFINE([_ATK_EXTERN], [__attribute__((visibility("default"))) extern],
+ [defines how to decorate public symbols while building])
+ ATK_HIDDEN_VISIBILITY_CFLAGS="-fvisibility=hidden"
+ ])
+ ;;
+esac
+AC_SUBST(ATK_HIDDEN_VISIBILITY_CFLAGS)
+