[PATCH 07/15] arm64: use -mno-implicit-float instead of -mgeneral-regs-only
From: mark.rutland@arm.com (Mark Rutland)
Date: 2017-11-03 18:03:03
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On Fri, Nov 03, 2017 at 10:11:52AM -0700, Sami Tolvanen wrote:
From: Greg Hackmann <redacted> 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 <redacted> Cc: Matthias Kaehlcke <mka@chromium.org> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Ah, so I guess this is what I was hitting when testing with clang 5.0.0. I was under the impression that this series was jsut enablnig LTO support, not clang support generally. It would be much nicer if we could depend on a fixed clang to start with... Thanks, Mark.
quoted hunk ↗ jump to hunk
--- arch/arm64/Makefile | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 939b310913cf..eb6f3c9ec6cb 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile@@ -45,7 +45,13 @@ $(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 += -mno-implicit-float +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)-- 2.15.0.403.gc27cc4dac6-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel at lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel