1#serial 3 2# Make sure _GNU_SOURCE is defined where necessary: as early as possible 3# for configure-time tests, as well as for every source file that includes 4# config.h. 5 6# From Jim Meyering. 7 8AC_DEFUN([AC__GNU_SOURCE], 9[ 10 # Make sure that _GNU_SOURCE is defined for all subsequent 11 # configure-time compile tests. 12 # This definition must be emitted (into confdefs.h) before any 13 # test that involves compilation. 14 cat >>confdefs.h <<\EOF 15#ifndef _GNU_SOURCE 16# define _GNU_SOURCE 17#endif 18EOF 19 20 # Emit this code into config.h.in. 21 # The ifndef is to avoid redefinition warnings. 22 AH_VERBATIM([_GNU_SOURCE], [#ifndef _GNU_SOURCE 23# define _GNU_SOURCE 24#endif]) 25]) 26