From: Fangrui Song <maskray@google.com>
To: Nathan Chancellor <nathan@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
Michal Marek <michal.lkml@markovi.net>,
Nick Desaulniers <ndesaulniers@google.com>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com
Subject: Re: [PATCH 2/2] Makefile: Only specify '--prefix=' when building with clang + GNU as
Date: Tue, 2 Mar 2021 14:02:52 -0800 [thread overview]
Message-ID: <20210302220252.ulvlsfyp4ordwrky@google.com> (raw)
In-Reply-To: <20210302210646.3044738-2-nathan@kernel.org>
On 2021-03-02, Nathan Chancellor wrote:
>When building with LLVM_IAS=1, there is no point to specifying
>'--prefix=' because that flag is only used to find the cross assembler,
>which is clang itself when building with LLVM_IAS=1. All of the other
>tools are invoked directly from PATH or a full path specified via the
>command line, which does not depend on the value of '--prefix='.
>
>Sharing commands to reproduce issues becomes a little bit easier without
>a '--prefix=' value because that '--prefix=' value is specific to a
>user's machine due to it being an absolute path.
>
>Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Fangrui Song <maskray@google.com>
clang can spawn GNU as (if -f?no-integrated-as is specified) and GNU
objcopy (-f?no-integrated-as and -gsplit-dwarf and -g[123]).
With LLVM_IAS=1, these cases are ruled out.
next prev parent reply other threads:[~2021-03-03 1:43 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 21:06 [PATCH 1/2] Makefile: Remove '--gcc-toolchain' flag Nathan Chancellor
2021-03-02 21:06 ` [PATCH 2/2] Makefile: Only specify '--prefix=' when building with clang + GNU as Nathan Chancellor
2021-03-02 22:02 ` Fangrui Song [this message]
2021-03-02 22:09 ` Nick Desaulniers
2021-03-02 22:40 ` Nick Desaulniers
2021-03-09 19:55 ` Masahiro Yamada
2021-03-09 19:58 ` Masahiro Yamada
2021-09-29 17:26 ` kernel test robot
2021-09-29 19:32 ` kernel test robot
2021-03-02 21:43 ` [PATCH 1/2] Makefile: Remove '--gcc-toolchain' flag Fangrui Song
2021-03-03 8:33 ` Masahiro Yamada
2021-03-02 22:33 ` Nick Desaulniers
2021-03-03 3:25 ` Sedat Dilek
2021-03-03 14:22 ` Sedat Dilek
2021-03-09 20:59 ` [PATCH v2 " Nathan Chancellor
2021-03-09 20:59 ` [PATCH v2 2/2] Makefile: Only specify '--prefix=' when building with clang + GNU as Nathan Chancellor
2021-03-09 21:15 ` [PATCH v2 1/2] Makefile: Remove '--gcc-toolchain' flag Fangrui Song
2021-03-15 16:21 ` Masahiro Yamada
2021-03-15 16:41 ` Sedat Dilek
2021-03-16 15:36 ` Masahiro Yamada
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