[PATCH] autoheader: Write to stdout if an argument was given.

The documentation says:

    If you give `autoheader' an argument, it uses that file instead of
    `configure.ac' and writes the header file to the standard output
    instead of to `config.h.in'.  If you give `autoheader' an argument of
    `-', it reads the standard input instead of `configure.ac' and writes
    the header file to the standard output.

However, currently autoheader writes its output to a file, regardless
of whether an argument is given. This patch makes it work as advertised.

Signed-off-by: Andre Noll <[email protected]>
---
 bin/autoheader.in | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/bin/autoheader.in b/bin/autoheader.in
index 14b8f03..8f9dd51 100644
--- a/bin/autoheader.in
+++ b/bin/autoheader.in
@@ -55,7 +55,7 @@ local $config_h;
 my $config_h_in;
 my @prepend_include;
 my @include;
-
+my $dst;
 
 # $HELP
 # -----
@@ -119,6 +119,10 @@ sub parse_args ()
       my $configure_ac = require_configure_ac;
       push @ARGV, $configure_ac;
     }
+  else
+    {
+      $dst = "-";
+    }
 }
 
 
@@ -298,7 +302,8 @@ $out->close;
     if keys %symbol;
 }
 
-update_file ("$tmp/config.hin", "$config_h_in", $force);
+$dst = "$config_h_in" unless defined $dst;
+update_file ("$tmp/config.hin", "$dst", $force);
 
 ### Setup "GNU" style for perl-mode and cperl-mode.
 ## Local Variables:
-- 
2.7.4