linux-kernel - [PATCH 4/4] objtool: Disable GCC '-Wpacked' warnings

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Message-Id: <76d85d7b5a87566465095c500bce222ff5d7b146.1501188854.git.jpoimboe@redhat.com>
Date:   Thu, 27 Jul 2017 15:56:56 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] objtool: Disable GCC '-Wpacked' warnings

Objtool is failing to build with GCC 4.4.7 due to the following
warnings:

  cc1: warnings being treated as errors
  In file included from orc.h:21,
                   from orc_gen.c:21:
  orc_types.h:86: error: packed attribute is unnecessary for ‘sp_offset’
  orc_types.h:87: error: packed attribute is unnecessary for ‘bp_offset’
  orc_types.h:88: error: packed attribute is unnecessary for ‘sp_reg’

I suspect those warnings are a GCC bug.  But -Wpacked isn't very useful
anyway, so just disable it.

Fixes: 627fce14809b ("objtool: Add ORC unwind table generation")
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 tools/objtool/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index 3a6425fefc43..6976c73e60c4 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -25,7 +25,8 @@ OBJTOOL_IN := $(OBJTOOL)-in.o
 all: $(OBJTOOL)
 
 INCLUDES := -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi
-CFLAGS   += -Wall -Werror $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -fomit-frame-pointer -O2 -g $(INCLUDES)
+WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed
+CFLAGS   += -Wall -Werror $(WARNINGS) -fomit-frame-pointer -O2 -g $(INCLUDES)
 LDFLAGS  += -lelf $(LIBSUBCMD)
 
 # Allow old libelf to be used:
-- 
2.13.3