tests: skip -Wall -Werror with Tru64 cc in cwrapper test.

[Ralf Wildenhues]

http://autobuild.josefsson.org/libtool/log-201008291316239205000.txt
Don't you love those permissive compilers where only the linker fails
later with:

libtool: link: /opt/fsw/bin/cc -g -Wall -Werror -o .libs/usea usea.o  
./.libs/liba.so -rpath /foo
Invalid flag usage: Wall, -Wx,-option must appear after -_SYSTYPE_SVR4
ld: Usage: ld [options] file [...]
stdout:
./../libtool/tests/cwrapper.at:77: exit code was 1, expected 0

Committed.

Cheers,
Ralf

    tests: skip -Wall -Werror with Tru64 cc in cwrapper test.
    
    * tests/cwrapper.at (cwrapper for uninstalled executables):
    Use a link test rather than a compile test to flesh out unknown
    compiler flags starting with -W; Tru64/OSF1 cc will happily
    accept `-Wall -Werror' as indication to pass flags on to
    subprocesses.

diff --git a/tests/cwrapper.at b/tests/cwrapper.at
index babd91e..248c0c0 100644
--- a/tests/cwrapper.at
+++ b/tests/cwrapper.at
@@ -1,6 +1,6 @@
 # cwrapper.at -- test cwrapper compliance with standards -*- Autotest -*-
 
-#   Copyright (C) 2009 Free Software Foundation, Inc.
+#   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
 #   Written by Charles Wilson, 2009
 #
 #   This file is part of GNU Libtool.
@@ -61,10 +61,10 @@ for restrictive_flags in '-Wall -Werror' '-std=c89 -Wall 
-Werror' '-std=c99 -Wal
   chmod +x libtool
   LIBTOOL=./libtool
 
-  # make sure $restrictive_flags do not cause a failure
+  # Make sure $restrictive_flags do not cause a failure
   # themselves (e.g. because a non-gcc compiler doesn't
-  # understand them)
-  $LIBTOOL --mode=compile $CC $CPPFLAGS $CFLAGS -c trivial.c || continue
+  # understand them).  Tru64 cc only fails when linking.
+  $LIBTOOL --mode=compile $CC $CPPFLAGS $CFLAGS trivial.c || continue
 
   AT_CHECK([$LIBTOOL --mode=compile $CC $CPPFLAGS $CFLAGS -c liba.c],
            [], [ignore], [ignore])
@@ -111,10 +111,10 @@ for debugwrapper_flags in '-DLT_DEBUGWRAPPER'; do
     < "$orig_LIBTOOL" > ./libtool
   LIBTOOL=./libtool
 
-  # make sure $debugwrapper_flags do not cause a failure
+  # Make sure $debugwrapper_flags do not cause a failure
   # themselves (e.g. because a non-gcc compiler doesn't
-  # understand them)
-  $LIBTOOL --mode=compile $CC $CPPFLAGS $CFLAGS -c trivial.c || continue
+  # understand them).  Tru64 cc only fails when linking.
+  $LIBTOOL --mode=compile $CC $CPPFLAGS $CFLAGS trivial.c || continue
 
   AT_CHECK([$LIBTOOL --mode=compile $CC $CPPFLAGS $CFLAGS -c liba.c],
            [], [ignore], [ignore])