AC_CONFIG_HEADERS and autoheader

[Patrick Welche <prlw1@xxxxxxxxxxxxxx>]

>From Nov 19 autoconf source, info autoconf says:

 -- Macro: AC_CONFIG_HEADERS (HEADER ..., [CMDS], [INIT-CMDS])
...
     Usually the input file is named `HEADER.in'; however, you can
     override the input file name by appending to HEADER a
     colon-separated list of input files.  Examples:

          AC_CONFIG_HEADERS([config.h:config.hin])
          AC_CONFIG_HEADERS([defines.h:defs.pre:defines.h.in:defs.post])

     Doing this allows you to keep your file names acceptable to DOS
     variants, or to prepend and/or append boilerplate to the file.

but autoheader can't cope with the last variant. The attached patch seems
to do the right thing, except I'm not sure what to do when I have
the following in configure.ac:

AC_CONFIG_HEADERS(config.h::config.h.in:config.post)

i.e., no config.pre. Patched autoheader correctly creates config.h.in, but
then running configure gets me:

config.status: creating Makefile
config.status: error: cannot find input file: 

Is that AC_CONFIG_HEADERS syntax simply not allowed? (missing file name)

Cheers,

Patrick

Index: autoheader.in
===================================================================
RCS file: /cvsroot/autoconf/autoconf/bin/autoheader.in,v
retrieving revision 1.146
diff -u -r1.146 autoheader.in
--- autoheader.in	16 Oct 2006 20:58:44 -0000	1.146
+++ autoheader.in	5 Dec 2006 12:21:43 -0000
@@ -54,7 +54,9 @@
 # Lib files.
 my $autom4te = $ENV{'AUTOM4TE'} || '@bindir@/@autom4te-name@';
 local $config_h;
+my $config_h_pre;
 my $config_h_in;
+my $config_h_post;
 my @prepend_include;
 my @include;
 
@@ -192,7 +194,12 @@
 # We template only the first CONFIG_HEADER.
 $config_h =~ s/ .*//;
 # Support "outfile[:infile]", defaulting infile="outfile.in".
-($config_h, $config_h_in) = split (':', $config_h, 2);
+($config_h, $config_h_pre, $config_h_in, $config_h_post)
+                                                 = split (':', $config_h, 4);
+if (length($config_h_in) == 0 && length($config_h_post) == 0)
+  {
+    $config_h_in = $config_h_pre;
+  }
 $config_h_in ||= "$config_h.in";
 
 # %SYMBOL might contain things like `F77_FUNC(name,NAME)', but we keep

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