linux-kernel - Re: [PATCH 2/3] objtool: Support HOSTCFLAGS and HOSTLDFLAGS

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Date:   Thu, 5 Apr 2018 15:01:23 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] objtool: Support HOSTCFLAGS and HOSTLDFLAGS

On 04/04/2018 09:42 PM, Masahiro Yamada wrote:
> 2018-03-29 9:48 GMT+09:00 Laura Abbott <labbott@...hat.com>:
>> 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>
>> ---
> 
> 
> I saw some similar patches before.
> 
> I thought they are fixing this way
> https://patchwork.kernel.org/patch/10251259/
> 
> but, I am not tacking the progress.
> 
> 
> 

That looks like a different issue since it's still not going to
pick up the HOST{C,LD}FLAGS.

> 
>>   tools/objtool/Makefile | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
>> index e6acc281dd37..0ff3bcac1ca9 100644
>> --- a/tools/objtool/Makefile
>> +++ b/tools/objtool/Makefile
>> @@ -31,8 +31,9 @@ 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   += -Wall -Werror $(WARNINGS) $(HOSTCFLAGS) -fomit-frame-pointer -O2 -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)
>> --
>> 2.16.2
>>
>> --
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> 
> 
>