fix problem when using Autoconf 2.59 when testing Bison

[Paul Eggert]

I ran into the following problem when testing CVS Bison using the
latest autotools, using "make check":

   ...
   make  check-local
   make[2]: Entering directory `/home/eggert/src/gnu/bison/tests'
   echo "WARNING: Multiple inclusion warning should be ignored." >&2
   WARNING: Multiple inclusion warning should be ignored.
   /bin/sh /home/eggert/src/gnu/bison/config/missing --run autom4te 
--language=autotest -I . testsuite.at -o testsuite.tmp
   NONE:0: error: m4_init: unbalanced m4_divert_push:
   local.at:204: m4_divert_push: KILL
   local.at:204: m4_divert_push: BODY
   local.at:204: m4_divert_push: KILL
   NONE:0: the top level
   autom4te: /home/eggert/opt/Linux-2.4.18-bf2.4-unknown/merged/bin/m4 failed 
with exit status: 1
   make[2]: *** [testsuite] Error 1
   make[2]: Leaving directory `/home/eggert/src/gnu/bison/tests'
   make[1]: *** [check-am] Error 2
   make[1]: Leaving directory `/home/eggert/src/gnu/bison/tests'
   make: *** [check-recursive] Error 1

Rather than try to debug this, I simply removed the
backwards-compatibility hack in Bison to try to accommodate Autoconf
2.57 and earlier.  I vaguely recall that 2.58 had problems so I simply
bumped the required Autoconf version to 2.59.  I'm not particularly
happy about this but I didn't have time to do the software archaeology
to figure out what went wrong above.

I noticed that m4sugar.m4 in Bison has diverged from Autoconf, but
merging this didn't seem to fix the problem so I left it alone for now.

I installed the following patch.

2003-12-23  Paul Eggert  <address@hidden>

        * tests/local.at: Require Autoconf 2.59's Autotest.
        * tests/testsuite.at: Don't include local.at, since we now assume
        Autoconf 2.59 or later.  Autoconf 2.59 had some problems with
        including it.

Index: tests/local.at
===================================================================
RCS file: /cvsroot/bison/bison/tests/local.at,v
retrieving revision 1.3
diff -p -u -r1.3 local.at
--- tests/local.at      25 Aug 2003 07:15:49 -0000      1.3
+++ tests/local.at      24 Dec 2003 07:34:39 -0000
@@ -19,7 +19,7 @@
 # 02111-1307, USA.
 
 # We want a recent Autotest.
-m4_version_prereq([2.57])
+m4_version_prereq([2.59])
 
 
 ## ------------------------------- ##
Index: tests/testsuite.at
===================================================================
RCS file: /cvsroot/bison/bison/tests/testsuite.at,v
retrieving revision 1.25
diff -p -u -r1.25 testsuite.at
--- tests/testsuite.at  30 Sep 2003 16:45:13 -0000      1.25
+++ tests/testsuite.at  24 Dec 2003 07:34:39 -0000
@@ -18,11 +18,6 @@
 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 # 02111-1307, USA.
 
-# Initializes Autotest, imports macros etc.  It will trigger a warning
-# with Autoconf 2.58, because it includes this file automatically, but
-# it causes no real problem.
-m4_include([local.at])
-
 
 # Testing resistance to user bugs.
 m4_include([input.at])