linux-kernel - [PATCH v2 3/4] Makefile: lld: tell clang to use lld

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Date:   Mon, 11 Feb 2019 11:30:05 -0800
From:   ndesaulniers@...gle.com
To:     yamada.masahiro@...ionext.com
Cc:     natechancellor@...il.com, sedat.dilek@...il.com,
        keescook@...omium.org, samitolvanen@...gle.com,
        michal.lkml@...kovi.net, akpm@...ux-foundation.org,
        hannes@...xchg.org, peterz@...radead.org,
        linux@...inikbrodowski.net, npiggin@...il.com,
        mathieu.desnoyers@...icios.com, gor@...ux.ibm.com, adrian@...as.de,
        rgb@...hat.com, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH v2 3/4] Makefile: lld: tell clang to use lld

This is needed because clang doesn't select which linker to use based on
$LD but rather -fuse-ld=lld. 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@...il.com>
Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
Tested-by: Nathan Chancellor <natechancellor@...il.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
Changes V1->V2:
* add reviewed and tested by tags.
* move this addition up 2 statments so that it's properly added to
  KBUILD_*FLAGS as per Nathan.

 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index d3b65e96d183..00e8e01d23fc 100644
--- a/Makefile
+++ b/Makefile
@@ -500,6 +500,9 @@ ifneq ($(GCC_TOOLCHAIN),)
 CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
 endif
 CLANG_FLAGS	+= -no-integrated-as
+ifneq ($(shell $(LD) --version 2>&1 | head -n 1 | grep LLD),)
+CLANG_FLAGS	+= -fuse-ld=lld
+endif
 KBUILD_CFLAGS	+= $(CLANG_FLAGS)
 KBUILD_AFLAGS	+= $(CLANG_FLAGS)
 export CLANG_FLAGS
-- 
2.20.1.791.gb4d0f1c61a-goog