[PATCH 3/3] arm64: use -mno-implicit-float instead of -mgeneral-regs-only
From: samitolvanen@google.com (Sami Tolvanen)
Date: 2017-11-29 00:00:44
Also in:
linux-kbuild, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
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> [added clang-ifversion to enable the workaround only for clang <6.0] Signed-off-by: Sami Tolvanen <samitolvanen@google.com> --- arch/arm64/Makefile | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index b35788c909f1..d2efb5a0212f 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile@@ -49,7 +49,10 @@ $(warning Detected assembler with broken .inst; disassembly will be unreliable) endif endif -KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) +# This is a workaround for https://bugs.llvm.org/show_bug.cgi?id=30792. +KBUILD_CFLAGS += $(call clang-ifversion, -lt, 0600, -mno-implicit-float, -mgeneral-regs-only) + +KBUILD_CFLAGS += $(lseinstr) $(brokengasinst) KBUILD_CFLAGS += -fno-asynchronous-unwind-tables KBUILD_CFLAGS += $(call cc-option, -mpc-relative-literal-loads) KBUILD_AFLAGS += $(lseinstr) $(brokengasinst)
--
2.15.0.417.g466bffb3ac-goog