AC_GNU_SOURCE is broken, define _GNU_SOURCE unconditionally

diff --git a/m4/usual.m4 b/m4/usual.m4
index 3489e1e19cad525948158d9450fbfc8e003a360a..c06c78f2604bb668a37726de553df7f7bf094aff 100644 (file)
--- a/m4/usual.m4
+++ b/m4/usual.m4
@@ -35,7 +35,7 @@ dnl
 AC_DEFUN([AC_USUAL_PROGRAM_CHECK], [
 AC_PROG_CC
 AC_PROG_CPP
-AC_GNU_SOURCE
+AC_DEFINE([_GNU_SOURCE], [1], [Glibc requires it.])
 dnl Check if compiler supports __func__
 AC_CACHE_CHECK([whether compiler supports __func__], pgac_cv_funcname_func,
   [AC_TRY_COMPILE([#include <stdio.h>], [printf("%s\n", __func__);],