Get it right :-)

(jm_CHECK_ALL_TYPES) [_GNU_SOURCE]: Emit the
actual #define via AH_VERBATIM.  Don't need separate AC_DEFINE.
Suggestion from Akim Demaille.

diff --git a/m4/jm-macros.m4 b/m4/jm-macros.m4
index 625a926..ebc1946 100644 (file)
--- a/m4/jm-macros.m4
+++ b/m4/jm-macros.m4
@@ -1,4 +1,4 @@
-#serial 15
+#serial 16
 
 dnl Misc type-related macros for fileutils, sh-utils, textutils.
 
@@ -198,12 +198,9 @@ AC_DEFUN(jm_CHECK_ALL_TYPES,
   # Emit this code into config.h.in.
   # The ifndef is to avoid redefinition warnings.
   AH_VERBATIM([_GNU_SOURCE], [#ifndef _GNU_SOURCE
-# undef _GNU_SOURCE
+# define _GNU_SOURCE
 #endif])
 
-  # Enable GNU extensions.
-  AC_DEFINE([_GNU_SOURCE])
-
   dnl This test must come as early as possible after the compiler configuration
   dnl tests, because the choice of the file model can (in principle) affect
   dnl whether functions and headers are available, whether they work, etc.