1 dnl BEGIN CF_GNU_SOURCE from lynx 2.8.5 distibution
2 dnl $Id: ac_cf_gnu_source.m4,v 1.1 2003/06/07 02:56:50 dnelson Exp $
3 dnl ---------------------------------------------------------------------------
4 dnl Check if we must define _GNU_SOURCE to get a reasonable value for
5 dnl _XOPEN_SOURCE, upon which many POSIX definitions depend. This is a defect
6 dnl (or misfeature) of glibc2, which breaks portability of many applications,
7 dnl since it is interwoven with GNU extensions.
9 dnl Well, yes we could work around it...
10 AC_DEFUN([CF_GNU_SOURCE],
12 AC_CACHE_CHECK(if we must define _GNU_SOURCE,cf_cv_gnu_source,[
13 AC_TRY_COMPILE([#include <sys/types.h>],[
17 [cf_cv_gnu_source=no],
19 CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
20 AC_TRY_COMPILE([#include <sys/types.h>],[
24 [cf_cv_gnu_source=no],
25 [cf_cv_gnu_source=yes])
29 test "$cf_cv_gnu_source" = yes && CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
31 dnl END CF_GNU_SOURCE from lynx 2.8.5 distibution