From: Nathan Chancellor <natechancellor@gmail.com>
To: ndesaulniers@google.com
Cc: yamada.masahiro@socionext.com,
Michal Marek <michal.lkml@markovi.net>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/4] Makefile: lld: tell clang to use lld
Date: Thu, 7 Feb 2019 22:50:59 -0700 [thread overview]
Message-ID: <20190208055059.GD9647@archlinux-ryzen> (raw)
In-Reply-To: <20190207220155.81351-3-ndesaulniers@google.com>
On Thu, Feb 07, 2019 at 02:01:51PM -0800, ndesaulniers@google.com wrote:
> This is needed because clang doesn't select which linker to use based on
> $LD but rather -fuse-ld=$(LD). This is problematic especially for
> cc-ldoption, which checks for linker flag support via invoking the
> compiler, rather than the linker.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/342
> Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
> Makefile | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/Makefile b/Makefile
> index 0eae4277206e..6307c17259ea 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -502,6 +502,9 @@ endif
> CLANG_FLAGS += -no-integrated-as
> KBUILD_CFLAGS += $(CLANG_FLAGS)
> KBUILD_AFLAGS += $(CLANG_FLAGS)
> +ifneq ($(shell $(LD) --version 2>&1 | head -n 1 | grep LLD),)
> +CLANG_FLAGS += -fuse-ld=lld
> +endif
This section needs to be moved up above KBUILD_CFLAGS otherwise it never
actually gets passed along.
With that change, please add:
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
> export CLANG_FLAGS
> endif
>
> --
> 2.20.1.791.gb4d0f1c61a-goog
>
next prev parent reply other threads:[~2019-02-08 5:51 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-07 22:01 [PATCH 1/4] init/Kconfig: add config support for detecting linker ndesaulniers
2019-02-07 22:01 ` [PATCH 2/4] Makefile: clang: choose GCC_TOOLCHAIN_DIR not on LD ndesaulniers
2019-02-08 5:45 ` Nathan Chancellor
2019-02-07 22:01 ` [PATCH 3/4] Makefile: lld: tell clang to use lld ndesaulniers
2019-02-08 5:50 ` Nathan Chancellor [this message]
2019-02-08 17:27 ` Nick Desaulniers
2019-02-08 17:45 ` Nathan Chancellor
2019-02-11 15:32 ` Masahiro Yamada
2019-02-11 16:05 ` Sedat Dilek
2019-02-11 19:30 ` Nick Desaulniers
2019-02-11 19:27 ` Nick Desaulniers
2019-02-11 19:26 ` Nick Desaulniers
2019-02-07 22:01 ` [PATCH 4/4] Makefile: lld: set -O2 linker flag when linking with LLD ndesaulniers
2019-02-08 6:07 ` Nathan Chancellor
2019-02-08 0:48 ` [PATCH 1/4] init/Kconfig: add config support for detecting linker Kees Cook
2019-02-08 0:57 ` Mathieu Desnoyers
2019-02-08 5:41 ` Nathan Chancellor
2019-02-11 15:08 ` Masahiro Yamada
2019-02-08 5:14 ` Nathan Chancellor
2019-02-08 14:21 [PATCH 3/4] Makefile: lld: tell clang to use lld Sedat Dilek
2019-02-08 16:24 ` Nathan Chancellor
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