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

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Message-ID: <CAK7LNASd5Ano4G0Uay8MffBp0yb5TQ_1C+WaGv57pPv_J15_gQ@mail.gmail.com>
Date:   Thu, 5 Apr 2018 13:42:05 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Laura Abbott <labbott@...hat.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

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.




>  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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-- 
Best Regards
Masahiro Yamada