Fix a problem on some distros that have buggy versions of gcc (e.g.,

https://bugs.launchpad.net/ubuntu/+source/gcc-4.2/+bug/284401).
Ensure to test for -Wno-long-* in combination with other CFLAGS that
we added, not just individually.

This commit was SVN r19838.

config/ompi_setup_cc.m4

@@ -11,6 +11,7 @@ dnl                         University of Stuttgart.  All rights reserved.
 dnl Copyright (c) 2004-2006 The Regents of the University of California.
 dnl                         All rights reserved.
 dnl Copyright (c) 2007-2008 Sun Microsystems, Inc.  All rights reserved.
+dnl Copyright (c) 2008      Cisco Systems, Inc.  All rights reserved.
 dnl $COPYRIGHT$
 dnl 
 dnl Additional copyrights may follow
@@ -127,7 +128,7 @@ AC_DEFUN([OMPI_SETUP_CC],[
         #
         # Actually, this is not real fix, as GCC will pass on any -Wno- flag,
         # have fun with the warning: -Wno-britney
-        CFLAGS="$CFLAGS -Wno-long-double -Wstrict-prototypes"
+        CFLAGS="$CFLAGS $add -Wno-long-double -Wstrict-prototypes"
 
         AC_CACHE_CHECK([if $CC supports -Wno-long-double],
                    [ompi_cv_cc_wno_long_double],

config/ompi_setup_cxx.m4

@@ -13,6 +13,7 @@ dnl                         All rights reserved.
 dnl Copyright (c) 2006      Los Alamos National Security, LLC.  All rights
 dnl                         reserved. 
 dnl Copyright (c) 2007      Sun Microsystems, Inc.  All rights reserved.
+dnl Copyright (c) 2008      Cisco Systems, Inc.  All rights reserved.
 dnl $COPYRIGHT$
 dnl 
 dnl Additional copyrights may follow
@@ -58,7 +59,7 @@ AC_DEFUN([OMPI_SETUP_CXX],[
         # see if -Wno-long-double works...
         AC_LANG_PUSH(C++)
         CXXFLAGS_orig="$CXXFLAGS"
-        CXXFLAGS="$CXXFLAGS -Wno-long-double -fstrict-prototype"
+        CXXFLAGS="$CXXFLAGS $add -Wno-long-double -fstrict-prototype"
         AC_CACHE_CHECK([if $CXX supports -Wno-long-double],
                    [ompi_cv_cxx_wno_long_double],
                    [AC_TRY_COMPILE([], [],