From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: linuxppc-dev@lists.ozlabs.org
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
llvm@lists.linux.dev, Nick Desaulniers <ndesaulniers@google.com>,
Alan Modra <amodra@au1.ibm.com>,
Nicholas Piggin <npiggin@gmail.com>,
Daniel Axtens <dja@axtens.net>
Subject: [PATCH llvm 2/6] powerpc: check for support for -Wa,-m{power4,any}
Date: Tue, 21 Dec 2021 16:59:00 +1100 [thread overview]
Message-ID: <20211221055904.555763-3-aik@ozlabs.ru> (raw)
In-Reply-To: <20211221055904.555763-1-aik@ozlabs.ru>
From: Daniel Axtens <dja@axtens.net>
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>
---
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
next prev parent reply other threads:[~2021-12-21 6:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-21 5:58 [PATCH kernel 0/6] powerpc: Build with LLVM_IAS=1 Alexey Kardashevskiy
2021-12-21 5:58 ` [PATCH llvm 1/6] powerpc/toc: PowerPC64 future proof kernel toc, revised for lld Alexey Kardashevskiy
2021-12-21 5:59 ` Alexey Kardashevskiy [this message]
2021-12-21 5:59 ` [PATCH llvm 3/6] powerpc/64/asm: Inline BRANCH_TO_C000 Alexey Kardashevskiy
2021-12-21 5:59 ` [PATCH llvm 4/6] powerpc/64/asm: Do not reassign labels Alexey Kardashevskiy
2021-12-21 5:59 ` [PATCH llvm 5/6] powerpc/mm: Switch obsolete dssall to .long Alexey Kardashevskiy
2021-12-21 5:59 ` [PATCH llvm 6/6] powerpc/mm/book3s64/hash: Switch pre 2.06 tlbiel " Alexey Kardashevskiy
2021-12-26 21:52 ` [PATCH kernel 0/6] powerpc: Build with LLVM_IAS=1 Michael Ellerman
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