From mboxrd@z Thu Jan 1 00:00:00 1970 From: samitolvanen@google.com (Sami Tolvanen) Date: Wed, 15 Nov 2017 13:34:14 -0800 Subject: [PATCH v2 04/18] arm64: use -mno-implicit-float instead of -mgeneral-regs-only In-Reply-To: <20171115213428.22559-1-samitolvanen@google.com> References: <20171115213428.22559-1-samitolvanen@google.com> Message-ID: <20171115213428.22559-5-samitolvanen@google.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Greg Hackmann LLVM bug 30792 causes clang's AArch64 backend to crash compiling arch/arm64/crypto/aes-ce-cipher.c. Replacing -mgeneral-regs-only with -mno-implicit-float is the suggested workaround. Signed-off-by: Greg Hackmann Cc: Matthias Kaehlcke [added cc-ifversion to enable the workaround only for clang <6.0] Signed-off-by: Sami Tolvanen --- arch/arm64/Makefile | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index b35788c909f1..ecd5ed11c764 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -49,7 +49,13 @@ $(warning Detected assembler with broken .inst; disassembly will be unreliable) endif endif -KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) +ifeq ($(cc-name),clang) +# This is a workaround for https://bugs.llvm.org/show_bug.cgi?id=30792. +KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0600, -mno-implicit-float, -mgeneral-regs-only) +else +KBUILD_CFLAGS += -mgeneral-regs-only +endif +KBUILD_CFLAGS += $(lseinstr) $(brokengasinst) KBUILD_CFLAGS += -fno-asynchronous-unwind-tables KBUILD_CFLAGS += $(call cc-option, -mpc-relative-literal-loads) KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) -- 2.15.0.448.gf294e3d99a-goog