m4/gnu-source.m4

   1 # AC_GNU_SOURCE
   2 # --------------
   3 AC_DEFUN([AC_GNU_SOURCE],
   4 [AH_VERBATIM([_GNU_SOURCE],
   5 [/* Enable GNU extensions on systems that have them.  */
   6 #ifndef _GNU_SOURCE
   7 # undef _GNU_SOURCE
   8 #endif])dnl
   9 AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
  10 AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
  11 AC_DEFINE([_GNU_SOURCE])
  12 ])