Re: autom4te and m4

[Paul Eggert]

Patrick Welche <address@hidden> writes:

> The attached patch is necessary as if you set the environment variable M4
> to "m4 --nesting-limit=2048", the regexp won't match as there is a '='
> rather than a ' ' after nesting-limit.
>
> BTW if even 2048 is too small what could be wrong with my configure
> script? (In fact this is apr, at the autoheader stage)

Hard to say, other than the obvious "you've got a recursive loop".

Thanks for reporting the problem.  I installed the following
slightly-different patch into CVS.  Does it work for you?

2005-07-04  Paul Eggert  <address@hidden>

        * bin/autom4te.in ($m4): Catch usages like --nesting-limit=2048.
        Problem reported by Patrick Welche.

Index: bin/autom4te.in
===================================================================
RCS file: /cvsroot/autoconf/autoconf/bin/autom4te.in,v
retrieving revision 1.95
diff -p -u -r1.95 autom4te.in
--- bin/autom4te.in     14 May 2005 07:00:39 -0000      1.95
+++ bin/autom4te.in     5 Jul 2005 06:45:24 -0000
@@ -95,7 +95,7 @@ fatal "need GNU m4 1.4 or later: $m4"
 # Set some high recursion limit as the default limit, 250, has already
 # been hit with AC_OUTPUT.  Don't override the user's choice.
 $m4 .= ' --nesting-limit=1024'
-  if " $m4 " !~ / (--nesting-limit|-L) /;
+  if " $m4 " !~ / (--nesting-limit(=[0-9]+)?|-L[0-9]*) /;
 
 
 # @M4_BUILTIN -- M4 builtins and a useful comment.