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

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Message-ID: <20180406172705.zvvmdf6d32jzj5v3@treble>
Date:   Fri, 6 Apr 2018 12:27:05 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] objtool: Support HOSTCFLAGS and HOSTLDFLAGS

On Wed, Mar 28, 2018 at 05:48:04PM -0700, Laura Abbott wrote:
> 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>
> ---
>  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)

HOSTCFLAGS already has '-Wall', '-fomit-frame-pointer', and '-O2', so we
can remove the setting of those in CFLAGS here.

-- 
Josh