Fix parsing Fortran linker output for gfortran 4.3 (was: generated configure script doesn't work when "diff" isn't available)

[Ralf Wildenhues]

* Vincent Lefevre wrote on Fri, Mar 21, 2008 at 04:51:54PM CET:
> On 2008-03-21 15:31:16 +0100, Ralf Wildenhues wrote:
> > On Fri, March 21, 2008 14:30, Vincent Lefevre wrote:
> > >
> > > First, on a Debian/unstable machine, "make check" gives the following
> > > failures:
> > >
> > > 194: AC_F77_MAIN                                     FAILED
> > > (acfortran.at:13)

> > Could you send tests/testsuite.log for this?  Thanks.
> 
> Attached.

Thanks.  I'm applying this patch, and putting you in THANKS.  Could you
please check that it fixes the failures you encounter?  Rerun them with
  make check TESTSUITEFLAGS='-k ".*_F77_.*" -k ".*_FC_.*"'

Cheers,
Ralf

    Fix Fortran testsuite failures with gfortran 4.3.
    
    * lib/autoconf/fortran.m4 (_AC_PROG_FC_V_OUTPUT): When scanning
    verbose compiler output, skip lines that set variables; gfortran
    4.3 sets LIBRARY_PATH, COMPILER_PATH, COLLECT_GCC_OPTIONS.
    * THANKS: Update.
    Report by Vincent Lefèvre.
    
    Signed-off-by: Ralf Wildenhues <address@hidden>

diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
index fa476b3..96ce4b8 100644
--- a/lib/autoconf/fortran.m4
+++ b/lib/autoconf/fortran.m4
@@ -1,6 +1,6 @@
 # This file is part of Autoconf.                       -*- Autoconf -*-
 # Fortran languages support.
-# Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007
+# Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2008
 # Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
@@ -549,7 +549,10 @@ _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS 
m4_default([$1], [$ac_cv_prog_
 eval "set x $ac_link"
 shift
 _AS_ECHO_LOG([$[*]])
-ac_[]_AC_LANG_ABBREV[]_v_output=`eval $ac_link AS_MESSAGE_LOG_FD>&1 2>&1 | 
grep -v 'Driving:'`
+# gfortran 4.3 outputs lines setting COLLECT_GCC_OPTIONS, COMPILER_PATH,
+# LIBRARY_PATH; skip all such settings.
+ac_[]_AC_LANG_ABBREV[]_v_output=`eval $ac_link AS_MESSAGE_LOG_FD>&1 2>&1 |
+  grep -v 'Driving:' | grep -v "^[[_$as_cr_Letters]][[_$as_cr_alnum]]*="`
 AS_ECHO(["$ac_[]_AC_LANG_ABBREV[]_v_output"]) >&AS_MESSAGE_LOG_FD
 _AC_LANG_PREFIX[]FLAGS=$ac_save_FFLAGS