| dnl Copyright (C) 2025 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl This program is distributed in the hope that it will be useful, |
| dnl but WITHOUT ANY WARRANTY, to the extent permitted by law; without |
| dnl even the implied warranty of MERCHANTABILITY or FITNESS FOR A |
| dnl PARTICULAR PURPOSE. |
| |
| m4_include([m4/autoconf.m4]) |
| |
| dnl Check whether the target supports hidden visibility. |
| AC_DEFUN([LIBGA68_CHECK_ATTRIBUTE_VISIBILITY], [ |
| AC_CACHE_CHECK([whether the target supports hidden visibility], |
| libga68_cv_have_attribute_visibility, [ |
| save_CFLAGS="$CFLAGS" |
| CFLAGS="$CFLAGS -Werror" |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[void __attribute__((visibility("hidden"))) foo(void) { }]], [])], |
| [libga68_cv_have_attribute_visibility=yes], |
| [libga68_cv_have_attribute_visibility=no]) |
| CFLAGS="$save_CFLAGS"]) |
| if test $libga68_cv_have_attribute_visibility = yes; then |
| AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1, |
| [Define to 1 if the target supports __attribute__((visibility(...))).]) |
| fi]) |
