#serial 2
# Make sure _GNU_SOURCE is defined where necessary: as early as possible
# for configure-time tests, as well as for every source file that includes
# config.h.
# From Jim Meyering.
AC_DEFUN(AC__GNU_SOURCE,
[
# Make sure that _GNU_SOURCE is defined for all subsequent
# configure-time compile tests.
# This definition must be emitted (into confdefs.h) before any
# test that involves compilation.
cat >>confdefs.h <<\EOF
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
EOF
# Emit this code into config.h.in.
# The ifndef is to avoid redefinition warnings.
AH_VERBATIM([_GNU_SOURCE], [#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif])
])
