[SCM] GNU Autoconf source repository branch, master, updated. v2.62-50-g4b8a55e

[Eric Blake]

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- Log -----------------------------------------------------------------
commit 4b8a55e1e015fc5ba0ceee63ce3739ea1e41b686
Author: Eric Blake <address@hidden>
Date:   Mon Jul 21 16:41:10 2008 -0600

    Ignore undefined macros, necessary with m4 1.6.
    
    * bin/autoupdate.in (_au___undefine): New macro,...
    (_au__undefine): ...wrapped by ifdef to silence m4 warnings.
    Reported by Ralf Wildenhues.
    
    Signed-off-by: Eric Blake <address@hidden>

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog         |    5 +++++
 bin/autoupdate.in |    4 +++-
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index a45513f..eda6995 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2008-07-21  Eric Blake  <address@hidden>
 
+       Ignore undefined macros, necessary with m4 1.6.
+       * bin/autoupdate.in (_au___undefine): New macro,...
+       (_au__undefine): ...wrapped by ifdef to silence m4 warnings.
+       Reported by Ralf Wildenhues.
+
        Resync with gnulib.
        * GNUmakefile: Grab from upstream, to fix issue where 'make
        install' would allow installation of stale version string.
diff --git a/bin/autoupdate.in b/bin/autoupdate.in
index 3a01af7..644de19 100644
--- a/bin/autoupdate.in
+++ b/bin/autoupdate.in
@@ -267,8 +267,10 @@ foreach my $file (@ARGV)
       # Define our special macros:
       define([_au__defn], defn([defn]))
       define([_au__divert], defn([divert]))
+      define([_au__ifdef], defn([ifdef]))
       define([_au__include], defn([include]))
-      define([_au__undefine], defn([undefine]))
+      define([_au___undefine], defn([undefine]))
+      define([_au__undefine], [_au__ifdef([$1], [_au___undefine([$1])])])
       define([_au__save], [m4_ifdef([$1], [m4_copy([$1], [_au_$1])])])
       define([_au__restore],
        [_au_m4_ifdef([_au_$1],


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