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[2001:44b8:1113:6700:6e65:7e50:8dac:f7ef]) by smtp.gmail.com with ESMTPSA id 8sm4292406pfp.171.2021.02.24.19.10.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Feb 2021 19:10:19 -0800 (PST) From: Daniel Axtens To: llvmlinux@lists.linuxfoundation.org, linuxppc-dev@lists.ozlabs.org Subject: [RFC PATCH 2/8] powerpc: check for support for -Wa,-m{power4,any} Date: Thu, 25 Feb 2021 14:10:00 +1100 Message-Id: <20210225031006.1204774-3-dja@axtens.net> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210225031006.1204774-1-dja@axtens.net> References: <20210225031006.1204774-1-dja@axtens.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Axtens Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 --- arch/powerpc/Makefile | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 08cf0eade56a..3e2c72d20bb8 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -252,7 +252,9 @@ 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) -- 2.27.0