From: ndesaulniers@google.com
To: yamada.masahiro@socionext.com
Cc: natechancellor@gmail.com, sedat.dilek@gmail.com,
keescook@chromium.org, samitolvanen@google.com,
michal.lkml@markovi.net, akpm@linux-foundation.org,
hannes@cmpxchg.org, peterz@infradead.org,
linux@dominikbrodowski.net, npiggin@gmail.com,
mathieu.desnoyers@efficios.com, gor@linux.ibm.com,
adrian@lisas.de, rgb@redhat.com, linux-kbuild@vger.kernel.org,
linux-kernel@vger.kernel.org,
Nick Desaulniers <ndesaulniers@google.com>
Subject: [PATCH v2 2/4] Makefile: clang: choose GCC_TOOLCHAIN_DIR not on LD
Date: Mon, 11 Feb 2019 11:30:04 -0800 [thread overview]
Message-ID: <20190211193008.24101-2-ndesaulniers@google.com> (raw)
In-Reply-To: <20190211193008.24101-1-ndesaulniers@google.com>
This causes an issue when trying to build with `make LD=ld.lld` if
ld.lld and the rest of your cross tools aren't in the same directory
(ex. /usr/local/bin) (as is the case for Android's build system), as the
GCC_TOOLCHAIN_DIR then gets set based on `which $(LD)` which will point
where LLVM tools are, not GCC/binutils tools are located.
Instead, select the GCC_TOOLCHAIN_DIR based on another tool provided by
binutils for which LLVM does not provide a substitute for, such as
elfedit.
Fixes commit 785f11aa595b ("kbuild: Add better clang cross build support")
Link: https://github.com/ClangBuiltLinux/linux/issues/341
Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
Changes V1->V2:
* add reviewed and tested tags.
Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
index 86cf35d1d79d..d3b65e96d183 100644
--- a/Makefile
+++ b/Makefile
@@ -492,7 +492,7 @@ endif
ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
ifneq ($(CROSS_COMPILE),)
CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
-GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
+GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
endif
--
2.20.1.791.gb4d0f1c61a-goog
next prev parent reply other threads:[~2019-02-11 19:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-11 19:30 [PATCH v2 1/4] init/Kconfig: add config support for detecting linker ndesaulniers
2019-02-11 19:30 ` ndesaulniers [this message]
2019-02-16 3:02 ` [PATCH v2 2/4] Makefile: clang: choose GCC_TOOLCHAIN_DIR not on LD Masahiro Yamada
2019-02-11 19:30 ` [PATCH v2 3/4] Makefile: lld: tell clang to use lld ndesaulniers
2019-02-13 14:58 ` Masahiro Yamada
2019-02-13 17:41 ` Nick Desaulniers
2019-02-16 3:07 ` Masahiro Yamada
2019-04-02 3:54 ` Nick Desaulniers
2019-04-02 4:49 ` Masahiro Yamada
2019-04-02 7:08 ` [PATCH v3] " Nick Desaulniers
2019-04-02 7:27 ` Nathan Chancellor
2019-04-02 7:33 ` [PATCH v4] " Nick Desaulniers
2019-04-02 7:57 ` Nathan Chancellor
2019-04-02 7:52 ` [PATCH v3] " Sedat Dilek
2019-04-02 7:56 ` Nathan Chancellor
2019-04-05 10:16 ` Masahiro Yamada
2019-04-05 16:11 ` Kees Cook
2019-04-05 16:52 ` Nick Desaulniers
2019-04-07 2:20 ` Masahiro Yamada
2019-02-11 19:30 ` [PATCH v2 4/4] Makefile: lld: set -O2 linker flag when linking with LLD ndesaulniers
2019-02-12 12:22 ` Peter Zijlstra
2019-02-16 2:55 ` Masahiro Yamada
2019-02-11 19:30 ` [PATCH v2 0/4] Improve kernel LLD support ndesaulniers
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