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Re: Detecting (g)m4


From: Joel E. Denny
Subject: Re: Detecting (g)m4
Date: Tue, 21 Jul 2009 14:40:32 -0400 (EDT)
User-agent: Alpine 1.00 (DEB 882 2007-12-20)

Hi Eric.

On Fri, 17 Jul 2009, Akim Demaille wrote:

> Le 16 juil. 09 à 19:27, Eric Blake a écrit :

> > Meanwhile, the latest git version uses serial 5 of autoconf's m4/m4.m4,
> > which
> > does a MUCH better job at picking m4 1.4.5 or newer, regardless of spelling.
> > Autoconf itself has moved on to serial 6 (which now checks for the m4 -g
> > flag
> > added in m4 1.4.12 or newer), so maybe it's time to do another submodule
> > update
> > to pick that up.
> 
> Sounds like a good idea.  Thanks for the advice!

I currently see serial 8 in autoconf's master branch.  Should that be ok 
for us?

I just noticed that branch-2.5 doesn't use the m4/m4.m4 from the autoconf 
submodule, so I pushed the following as a first step.

>From 62eb2d1bd97793cb641c88776965d75ccc14e8e6 Mon Sep 17 00:00:00 2001
From: Joel E. Denny <address@hidden>
Date: Tue, 21 Jul 2009 14:10:54 -0400
Subject: [PATCH] * m4/m4.m4: Make it a sym link to submodules/autoconf/m4/m4.m4.

diff --git a/m4/m4.m4 b/m4/m4.m4
deleted file mode 100644
index f27d8c0..5b176ba
--- a/m4/m4.m4
+++ /dev/null
@@ -1,46 +0,0 @@
-# m4.m4 serial 5
-dnl Copyright (C) 2000, 2006, 2007, 2008 Free Software Foundation, Inc.
-dnl This file is free software; the Free Software Foundation
-dnl gives unlimited permission to copy and/or distribute it,
-dnl with or without modifications, as long as this notice is preserved.
-
-# AC_PROG_GNU_M4
-# --------------
-# Check for GNU M4, at least 1.4.5 (all earlier versions had a bug in
-# trace support:
-# http://lists.gnu.org/archive/html/bug-gnu-utils/2006-11/msg00096.html)
-# Also, check whether --error-output (through 1.4.x) or --debugfile (2.0)
-# is supported, and AC_SUBST M4_DEBUGFILE accordingly.
-AC_DEFUN([AC_PROG_GNU_M4],
-  [AC_ARG_VAR([M4], [Location of GNU M4 1.4.5 or later.  Defaults to the first
-    program of `m4', `gm4', or `gnum4' on PATH that meets Autoconf needs.])
-  AC_CACHE_CHECK([for GNU M4 that supports accurate traces], [ac_cv_path_M4],
-    [rm -f conftest.m4f
-AC_PATH_PROGS_FEATURE_CHECK([M4], [m4 gm4 gnum4],
-      [dnl Creative quoting here to avoid raw dnl and ifdef in configure.
-      # Root out GNU M4 1.4.4, as well as non-GNU m4 that ignore -t, -F.
-      ac_snippet=change'quote(<,>)in''dir(<if''def>,mac,bug)d'nl
-      test -z "`$ac_path_M4 -F conftest.m4f </dev/null 2>&1`" \
-      && test -z "`echo $ac_snippet | $ac_path_M4 --trace=mac 2>&1`" \
-      && test -f conftest.m4f \
-      && ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:
-      rm -f conftest.m4f],
-      [AC_MSG_ERROR([no acceptable m4 could be found in \$PATH.
-GNU M4 1.4.5 or later is required; 1.4.11 is recommended])])])
-  M4=$ac_cv_path_M4
-  AC_CACHE_CHECK([how m4 supports trace files], [ac_cv_prog_gnu_m4_debugfile],
-    [case `$M4 --help < /dev/null 2>&1` in
-      *debugfile*) ac_cv_prog_gnu_m4_debugfile=--debugfile ;;
-      *) ac_cv_prog_gnu_m4_debugfile=--error-output ;;
-    esac])
-  AC_SUBST([M4_DEBUGFILE], [$ac_cv_prog_gnu_m4_debugfile])
-])
-
-# Compatibility for bootstrapping with Autoconf 2.61.
-dnl FIXME - replace this with AC_PREREQ([2.62]) after the release.
-# AC_PATH_PROGS_FEATURE_CHECK was added the same time the slightly broken,
-# undocumented _AC_PATH_PROG_FEATURE_CHECK was deleted.
-m4_ifndef([AC_PATH_PROGS_FEATURE_CHECK],
-  [m4_define([AC_PATH_PROGS_FEATURE_CHECK],
-    [_AC_PATH_PROG_FEATURE_CHECK([$1], [$2], [$3], [$5])
-])])
diff --git a/m4/m4.m4 b/m4/m4.m4
new file mode 120000
index f27d8c0..5b176ba
--- /dev/null
+++ b/m4/m4.m4
@@ -0,0 +1 @@
+../submodules/autoconf/m4/m4.m4
\ No newline at end of file
-- 
1.5.4.3

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