From f5140cab448e4819ca6f158cb4130352f73c92e4 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Tue, 21 Dec 2021 16:59:00 +1100
Subject: powerpc: check for support for -Wa,-m{power4,any}
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 <dja@axtens.net>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211221055904.555763-3-aik@ozlabs.ru
---
arch/powerpc/Makefile | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
(limited to 'arch/powerpc')
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)
--
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