From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it1-f201.google.com ([209.85.166.201]:56347 "EHLO mail-it1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388262AbfBKTap (ORCPT ); Mon, 11 Feb 2019 14:30:45 -0500 Received: by mail-it1-f201.google.com with SMTP id 135so91989itb.6 for ; Mon, 11 Feb 2019 11:30:45 -0800 (PST) Date: Mon, 11 Feb 2019 11:30:05 -0800 In-Reply-To: <20190211193008.24101-1-ndesaulniers@google.com> Message-Id: <20190211193008.24101-3-ndesaulniers@google.com> Mime-Version: 1.0 References: <20190211193008.24101-1-ndesaulniers@google.com> Subject: [PATCH v2 3/4] Makefile: lld: tell clang to use lld From: ndesaulniers@google.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kbuild-owner@vger.kernel.org List-ID: 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 This is needed because clang doesn't select which linker to use based on $LD but rather -fuse-ld=lld. This is problematic especially for cc-ldoption, which checks for linker flag support via invoking the compiler, rather than the linker. Link: https://github.com/ClangBuiltLinux/linux/issues/342 Suggested-by: Nathan Chancellor Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor Signed-off-by: Nick Desaulniers --- Changes V1->V2: * add reviewed and tested by tags. * move this addition up 2 statments so that it's properly added to KBUILD_*FLAGS as per Nathan. Makefile | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Makefile b/Makefile index d3b65e96d183..00e8e01d23fc 100644 --- a/Makefile +++ b/Makefile @@ -500,6 +500,9 @@ ifneq ($(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