Save and check Autom4te version in cache

Problem reported in <https://bugs.debian.org/219621>.
* bin/autom4te.in: Save and check autom4te version number into cache index.
* lib/Autom4te/C4che.pm (save): New arg $version.  All callers changed.
(good_version): New sub.

1 files changed, 3 insertions, 2 deletions

diff --git a/bin/autom4te.in b/bin/autom4te.in
index bcf0d498..4e2af77e 100644
--- a/bin/autom4te.in
+++ b/bin/autom4te.in
@@ -996,7 +996,8 @@ $icache_file->lock (LOCK_EX)
 # If autom4te is younger, then some structures such as C4che might
 # have changed, which would corrupt its processing.
 Autom4te::C4che->load ($icache_file)
-  if -f $icache && mtime ($icache) > mtime ($0);
+  if (-f $icache && mtime ($icache) > mtime ($0)
+      && Autom4te::C4che->good_version ($icache_file, '@VERSION@'));
 
 # Add the new trace requests.
 my $req = Autom4te::C4che->request ('input' => \@ARGV,
@@ -1061,7 +1062,7 @@ else
 
 # If we ran up to here, the cache is valid.
 $req->valid (1);
-Autom4te::C4che->save ($icache_file);
+Autom4te::C4che->save ($icache_file, '@VERSION@');
 
 exit $exit_code;