linux-kernel - Re: [PATCH] objtool: Allow AR to be overridden with HOSTAR

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Message-ID: <2bdc6dfa-bbe8-208f-fab5-30d67573345c@codeaurora.org>
Date:   Wed, 15 May 2019 18:05:30 +0530
From:   Mukesh Ojha <mojha@...eaurora.org>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] objtool: Allow AR to be overridden with HOSTAR


On 5/15/2019 4:10 AM, Nathan Chancellor wrote:
> Currently, this Makefile hardcodes GNU ar, meaning that if it is not
> available, there is no way to supply a different one and the build will
> fail.
>
> $ make AR=llvm-ar CC=clang LD=ld.lld HOSTAR=llvm-ar HOSTCC=clang \
>         HOSTLD=ld.lld HOSTLDFLAGS=-fuse-ld=lld defconfig modules_prepare
> ...
>    AR       /out/tools/objtool/libsubcmd.a
> /bin/sh: 1: ar: not found
> ...
>
> Follow the logic of HOST{CC,LD} and allow the user to specify a
> different ar tool via HOSTAR (which is used elsewhere in other
> tools/ Makefiles).
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/481
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>


Nice catch.
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>

Cheers,
-Mukesh

> ---
>   tools/objtool/Makefile | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile
> index 53f8be0f4a1f..88158239622b 100644
> --- a/tools/objtool/Makefile
> +++ b/tools/objtool/Makefile
> @@ -7,11 +7,12 @@ ARCH := x86
>   endif
>   
>   # always use the host compiler
> +HOSTAR	?= ar
>   HOSTCC	?= gcc
>   HOSTLD	?= ld
> +AR	 = $(HOSTAR)
>   CC	 = $(HOSTCC)
>   LD	 = $(HOSTLD)
> -AR	 = ar
>   
>   ifeq ($(srctree),)
>   srctree := $(patsubst %/,%,$(dir $(CURDIR)))