From octave-maintainers-request at bevo dot che dot wisc dot edu  Sat Dec  9 01:28:27 2000
Subject: gperf: compiling Octave from CVS sources
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: John Smith <john at arrows dot demon dot co dot uk>
Cc: octave-maintainers at bevo dot che dot wisc dot edu
Date: Sat, 9 Dec 2000 01:28:16 -0600

On  9-Dec-2000, John Smith <john at arrows dot demon dot co dot uk> wrote:

| I have collected Octave from CVS on 8 December 2000.
| 
| The ./configure is complaining about my gperf, and ultimately c++ complains
| about lex.cc in a way which looks related.
| 
| I have installed a new gperf; it says
| 
|    bash:> gperf --version
|    GNU gperf 2.7.2
| 
| ./configure is saying
| 
|   checking for gperf... gperf
|   configure: warning: I found gperf, but it does not support all of 
|              the following options: -t -C -D -E -G -L ANSI-C -H -N; 
|   you need gperf 2.7 or a more recent version
| 
| 
| I have started to search out an explanation: I think ./configure is 
| doing something like:
| 
| #! /bin/sh
| 
| echo "%{
| %}
| %%
| " | /usr/local/bin/gperf -t -C -D -E -G -L ANSI-C -H octave_kw_hash -N octave_kw_lookup 
| 
| which is giving the error message
| 
|    Empty input key is not allowed.
|    To recognize an empty input key, your code should check for
|    len == 0 before calling the gperf generated lookup function.
| 
| Can you give any advice?

Please try the following patch.  It sends

%{
%}
%%
foo

to gperf.

You'll need to rerun autoconf, remove config.cache, run configure
again, and probably also remove any incorrect version of
src/oct-gperf.h that you may have generated.

Thanks,

jwe



2000-12-09  John W. Eaton  <jwe at bevo dot che dot wisc dot edu>

	* aclocal.m4: Give gperf a keyword, to avoid complaints from newer
	versions.


Index: aclocal.m4
===================================================================
RCS file: /usr/local/cvsroot/octave/aclocal.m4,v
retrieving revision 1.49
diff -u -r1.49 aclocal.m4
--- aclocal.m4	2000/10/31 20:03:19	1.49
+++ aclocal.m4	2000/12/09 07:26:04
 at @ -875,7 +875,7 @@
     if echo "%{
 %}
 %%
-" | $GPERF -t -C -D -E -G -L ANSI-C -H octave_kw_hash -N octave_kw_lookup > /dev/null 2>&1; then
+foo" | $GPERF -t -C -D -E -G -L ANSI-C -H octave_kw_hash -N octave_kw_lookup > /dev/null 2>&1; then
       true
     else
       GPERF=""