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From: ndesaulniers@google.com
To: yamada.masahiro@socionext.com
Cc: Nick Desaulniers <ndesaulniers@google.com>,
	Nathan Chancellor <natechancellor@gmail.com>,
	Michal Marek <michal.lkml@markovi.net>,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 3/4] Makefile: lld: tell clang to use lld
Date: Thu,  7 Feb 2019 14:01:51 -0800	[thread overview]
Message-ID: <20190207220155.81351-3-ndesaulniers@google.com> (raw)
In-Reply-To: <20190207220155.81351-1-ndesaulniers@google.com>

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
 export CLANG_FLAGS
 endif
 
-- 
2.20.1.791.gb4d0f1c61a-goog


  parent reply	other threads:[~2019-02-07 22:02 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 ` ndesaulniers [this message]
2019-02-08  5:50   ` [PATCH 3/4] Makefile: lld: tell clang to use lld Nathan Chancellor
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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