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Date: Thu, 16 Mar 2017 17:15:15 -0700 From: Michael Davidson <md@...gle.com> To: Michal Marek <mmarek@...e.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Herbert Xu <herbert@...dor.apana.org.au>, "David S. Miller" <davem@...emloft.net>, Shaohua Li <shli@...nel.org> Cc: Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, Matthias Kaehlcke <mka@...omium.org>, x86@...nel.org, linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org, linux-raid@...r.kernel.org, Michael Davidson <md@...gle.com> Subject: [PATCH 2/7] Makefile, x86, LLVM: disable unsupported optimization flags Unfortunately, while clang generates a warning about these flags being unsupported it still exits with a status of 0 so we have to explicitly disable them instead of just using a cc-option check. Signed-off-by: Michael Davidson <md@...gle.com> --- Makefile | 2 ++ arch/x86/Makefile | 2 ++ 2 files changed, 4 insertions(+) diff --git a/Makefile b/Makefile index b21fd0ca2946..5e97e5fc1eea 100644 --- a/Makefile +++ b/Makefile @@ -629,7 +629,9 @@ ARCH_AFLAGS := ARCH_CFLAGS := include arch/$(SRCARCH)/Makefile +ifneq ($(cc-name),clang) KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) +endif KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 2d449337a360..894a8d18bf97 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -87,11 +87,13 @@ else KBUILD_AFLAGS += -m64 KBUILD_CFLAGS += -m64 +ifneq ($(cc-name),clang) # Align jump targets to 1 byte, not the default 16 bytes: KBUILD_CFLAGS += -falign-jumps=1 # Pack loops tightly as well: KBUILD_CFLAGS += -falign-loops=1 +endif # Don't autogenerate traditional x87 instructions KBUILD_CFLAGS += $(call cc-option,-mno-80387) -- 2.12.0.367.g23dc2f6d3c-goog
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