Re: _AC_LANG_OPENMP and m4_copy

[Bruno Haible]

Hello Ralf,

Thanks for the report and fix.

Eric Blake wrote:
> Looks fine to me, but let Bruno chime in before committing.  I agree with
> your approach of fixing gnulib to avoid the problem by not competing when
> a new-enough autoconf provides the macro

I agree with this approach. But the patch introduces the use of another
undocumented macro, namely 'm4_version_prereq'. I prefer to get away without
it, and am committing this:


2008-12-03  Ralf Wildenhues  <address@hidden>
            Bruno Haible  <address@hidden>

        * m4/openmp.m4 (AC_OPENMP): Do not define with Autoconf 2.62 or newer.

--- m4/openmp.m4.orig   2008-12-04 01:24:00.000000000 +0100
+++ m4/openmp.m4        2008-12-04 00:57:39.000000000 +0100
@@ -1,11 +1,15 @@
-# openmp.m4 serial 4
-dnl Copyright (C) 2006-2007 Free Software Foundation, Inc.
+# openmp.m4 serial 5
+dnl Copyright (C) 2006-2008 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
 dnl This file can be removed once we assume autoconf >= 2.62.
 
+dnl Expand to nothing in autoconf >= 2.62. m4_copy has a different
+dnl semantic in autoconf > 2.63.
+m4_ifdef([AC_OPENMP], [], [
+
 # _AC_LANG_OPENMP
 # ---------------
 # Expands to some language dependent source code for testing the presence of
@@ -90,3 +94,5 @@
   fi
   AC_SUBST([OPENMP_]_AC_LANG_PREFIX[FLAGS])
 ])
+
+])