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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=ow2DpQC2coKFnJ/SMWPFob1l5XzvaNidZbZlwjsfO1U=; b=MwUyD5qYy//XB09FZHEYXGiyyUo95WsYSwdXIJbR+6QNMw53ufwg9Vg9mpwOb1vSdC KOpmHXPj5VJvY3c9leBorgKxOL+daI8dYC+5eOuQGtnPMbPA46hD63p5wdXrSwQv1JBV u0CSnPHq+GDcWJxuhFDyPnfeANcfR4aHmvluR+pWDw7e9vNP10lSICnqMglKyDnvsHNs /kKRWCYReq1wJynpeYK8WA1/yC1rEbXSvl3SoBKvDMgZ3adQXXBzMAbn9uBD3XHc4S7R zQsCRDyx8dqpUkS6SyqUCG1vGjW1AFKQtSQ5ZF1FM7DWAkSdwKtTQeIc17tUGr0zjoBM qIRA== X-Gm-Message-State: AOAM533zfqx/wRuEgMgwnMxMe0rGgYOc+98fWX6BAKe3u/7CbbltbOJV q0G86sSw+ZPzBZHO09aRjB5luQ4weqt7KlNvOYQ= X-Google-Smtp-Source: ABdhPJxlOczNl134CJhArUI2DZNMqGi1FuYNGVwNL/HFfQHYPMGfW3r2ZHRfMfUt4l8ShCakf0Fc7HJg8TmQfC8ywFA= X-Received: from ndesaulniers1.mtv.corp.google.com ([2620:15c:211:202:4946:97e8:cb24:9825]) (user=ndesaulniers job=sendgmr) by 2002:a0c:c345:: with SMTP id j5mr2543715qvi.26.1625183709770; Thu, 01 Jul 2021 16:55:09 -0700 (PDT) Date: Thu, 1 Jul 2021 16:55:05 -0700 Message-Id: <20210701235505.1792711-1-ndesaulniers@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.32.0.93.g670b81a890-goog Subject: [PATCH] arm64: drop CROSS_COMPILE for LLVM=1 LLVM_IAS=1 From: Nick Desaulniers To: Catalin Marinas , Will Deacon Cc: Masahiro Yamada , Nick Desaulniers , Arnd Bergmann , Fangrui Song , Nathan Chancellor , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210701_165513_544384_DC88BE1C X-CRM114-Status: GOOD ( 12.61 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org We get constant feedback that the command line invocation of make is too long. CROSS_COMPILE is helpful when a toolchain has a prefix of the target triple, or is an absolute path outside of $PATH, but it's mostly redundant for a given ARCH. If CROSS_COMPILE is not set, simply set --target=aarch64-linux for CLANG_FLAGS, KBUILD_CFLAGS, and KBUILD_AFLAGS. Previously, we'd cross compile via: $ ARCH=arm64 CROSS_COMPILE=aarch64-linxu-gnu make LLVM=1 LLVM_IAS=1 Now: $ ARCH=arm64 make LLVM=1 LLVM_IAS=1 We can drop gnu from the triple, but dropping linux from the triple produces different .config files for the above invocations for the defconfig target. Link: https://github.com/ClangBuiltLinux/linux/issues/1399 Suggested-by: Arnd Bergmann Suggested-by: Fangrui Song Signed-off-by: Nick Desaulniers --- arch/arm64/Makefile | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 7bc37d0a1b68..016873fddcc3 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -34,6 +34,17 @@ $(warning LSE atomics not supported by binutils) endif endif +ifneq ($(LLVM),) +ifneq ($(LLVM_IAS),) +ifeq ($(CROSS_COMPILE),) +CLANG_TARGET :=--target=aarch64-linux +CLANG_FLAGS += $(CLANG_TARGET) +KBUILD_CFLAGS += $(CLANG_TARGET) +KBUILD_AFLAGS += $(CLANG_TARGET) +endif +endif +endif + cc_has_k_constraint := $(call try-run,echo \ 'int main(void) { \ asm volatile("and w0, w0, %w0" :: "K" (4294967295)); \