linux-kernel - [PATCHv2] objtool: Support HOSTCFLAGS and HOSTLDFLAGS

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Message-Id: <20180411200432.3493-1-labbott@redhat.com>
Date:   Wed, 11 Apr 2018 13:04:32 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Laura Abbott <labbott@...hat.com>, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: [PATCHv2] objtool: Support HOSTCFLAGS and HOSTLDFLAGS

It may be useful to compile host programs with different flags (e.g.
hardening). Ensure that objtool picks up the appropriate flags.

Signed-off-by: Laura Abbott <labbott@...hat.com>
---
v2: Drop several flags that are already defined in HOSTCFLAGS
---
 tools/objtool/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
index e6acc281dd37..7df979ae4573 100644
--- a/tools/objtool/Makefile
+++ b/tools/objtool/Makefile
@@ -31,8 +31,8 @@ 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   += -Wall -Werror $(WARNINGS) -fomit-frame-pointer -O2 -g $(INCLUDES)
-LDFLAGS  += -lelf $(LIBSUBCMD)
+CFLAGS   += -Werror $(WARNINGS) $(HOSTCFLAGS) -g $(INCLUDES)
+LDFLAGS  += -lelf $(LIBSUBCMD) $(HOSTLDFLAGS)
 
 # Allow old libelf to be used:
 elfshdr := $(shell echo '\#include <libelf.h>' | $(CC) $(CFLAGS) -x c -E - | grep elf_getshdr)
-- 
2.14.3