[PATCH llvm 2/6] powerpc: check for support for -Wa,-m{power4,any}
From: Alexey Kardashevskiy <hidden>
Date: 2021-12-21 06:00:29
Also in:
llvm
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
From: Daniel Axtens <redacted> LLVM's integrated assembler does not like either -Wa,-mpower4 or -Wa,-many. So just don't pass them if they're not supported. Signed-off-by: Daniel Axtens <redacted> Signed-off-by: Alexey Kardashevskiy <redacted> --- arch/powerpc/Makefile | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index e9aa4e8b07dd..5f16ac1583c5 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile@@ -245,7 +245,9 @@ cpu-as-$(CONFIG_E500) += -Wa,-me500 # When using '-many -mpower4' gas will first try and find a matching power4 # mnemonic and failing that it will allow any valid mnemonic that GAS knows # about. GCC will pass -many to GAS when assembling, clang does not. -cpu-as-$(CONFIG_PPC_BOOK3S_64) += -Wa,-mpower4 -Wa,-many +# LLVM IAS doesn't understand either flag: https://github.com/ClangBuiltLinux/linux/issues/675 +# but LLVM IAS only supports ISA >= 2.06 for Book3S 64 anyway... +cpu-as-$(CONFIG_PPC_BOOK3S_64) += $(call as-option,-Wa$(comma)-mpower4) $(call as-option,-Wa$(comma)-many) cpu-as-$(CONFIG_PPC_E500MC) += $(call as-option,-Wa$(comma)-me500mc) KBUILD_AFLAGS += $(cpu-as-y)
--
2.30.2