#serial 1 # 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. AC_DEFINE(_GNU_SOURCE_KLUDGE, [1 #ifndef _GNU_SOURCE # define _GNU_SOURCE #endif], [This definition has a four-line value, the last three of which ensure that _GNU_SOURCE is defined in confdefs.h.]) # 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]) ])