Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Luis Ressel <aranea@aixah.de>
To:     Josh Poimboeuf <jpoimboe@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        linux-kernel@vger.kernel.org (open list)
Cc:     Luis Ressel <aranea@aixah.de>, stable@vger.kernel.org
Subject: [PATCH] objtool: Don't use -Werror
Date:   Fri,  5 Apr 2019 13:01:50 +0200
Message-Id: <20190405110151.2461-1-aranea@aixah.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

-Werror can be handy for development, but enabling it for production
builds is a bad idea -- other compilers might produce unexpected
warnings, or #included library headers might trigger warnings.

In my case, libelf's (not elfutil's!) headers trigger several -Wundef
warnings. This wasn't a problem before 056d28d135bc, since gcc doesn't
emit warnings for system headers, but now that there's a
-I/usr/include/libelf/ in the gcc command line, those warnings appear
and break the build.

CC'ing stable@ since 056d28d135bc has also been included in stable
versions.

Fixes: 056d28d135bc ("objtool: Query pkg-config for libelf location")
Signed-off-by: Luis Ressel <aranea@aixah.de>
Cc: stable@vger.kernel.org
---
 tools/objtool/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 53f8be0f4a1f..ad2c11a881db 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -34,7 +34,7 @@ INCLUDES := -I$(srctree)/tools/include \
 	    -I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi \
 	    -I$(srctree)/tools/objtool/arch/$(ARCH)/include
 WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed
-CFLAGS   += -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBELF_FLAGS)
+CFLAGS   += $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBELF_FLAGS)
 LDFLAGS  += $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)
 
 # Allow old libelf to be used:
-- 
2.21.0