From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6CAE02EE27C; Thu, 25 Sep 2025 10:27:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758796024; cv=none; b=UYyDZJq0MRfB4SQxfrlOw2ImdrPwxBBy6oCbfyPb6DamW6fUENWyvWPYIHxvtf2XCiLEueMvavCobaLDt6OWNuj2Os7EENSwLzviopZD0nWvFqDyqDO4lzrjhEpv2p+3BD5wedMoo2x4JZiD7vZCODhg7gkKlaLwIPccR6jtyok= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758796024; c=relaxed/simple; bh=miZL6Yzqk6/EUWPBBeudxyQE12NEiBHtXzL1MUUXC30=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=QZaCGqOogbOunNNZHAYtSZGc0O/M1rthukAg5GuKW7TOF5k3RwA9s84fyc0nXuNuT8rPl4ewabWgwUouCsOteZu/a6mVRRFRS7J7HdMK49rQavUoRaP9xx9sCkbYidBJLh2adKmpzus5bGkZNmd8P05T5Dpr4g1OJ4hotZcmFNs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E14541692; Thu, 25 Sep 2025 03:26:53 -0700 (PDT) Received: from e132581.arm.com (e132581.arm.com [10.1.196.87]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 795723F694; Thu, 25 Sep 2025 03:26:58 -0700 (PDT) From: Leo Yan Date: Thu, 25 Sep 2025 11:26:31 +0100 Subject: [PATCH 7/8] perf build: Support build with clang Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250925-perf_build_android_ndk-v1-7-8b35aadde3dc@arm.com> References: <20250925-perf_build_android_ndk-v1-0-8b35aadde3dc@arm.com> In-Reply-To: <20250925-perf_build_android_ndk-v1-0-8b35aadde3dc@arm.com> To: Arnaldo Carvalho de Melo , Namhyung Kim , Jiri Olsa , Ian Rogers , Adrian Hunter , Quentin Monnet , Andrii Nakryiko , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , James Clark Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, llvm@lists.linux.dev, bpf@vger.kernel.org, Leo Yan X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1758795991; l=2752; i=leo.yan@arm.com; s=20250604; h=from:subject:message-id; bh=miZL6Yzqk6/EUWPBBeudxyQE12NEiBHtXzL1MUUXC30=; b=Hr9emfh/TZ8Hx0PqH+HDb4IZnm7jKayCxaeqpAksyZkgzjctwlyF8b6sbr6SAHJ8znK1ey92I QrkFGN5YsDFC+vwgbRSY5EjPXgbIZFsDGyBbzFP9PBS+orkmHW2+6ED X-Developer-Key: i=leo.yan@arm.com; a=ed25519; pk=k4BaDbvkCXzBFA7Nw184KHGP5thju8lKqJYIrOWxDhI= Add support for building perf with clang. For cross compilation, the Makefile dynamically selects target flag for corresponding arch. This patch has been verified on x86_64 machine with Ubuntu distro, it can build successfully for native target, and for cross building Arm64 and s390. Example: native build on x86_64 / Ubuntu machine: $ HOSTCC=clang CC=clang CXX=clang++ make -C tools/perf Example: cross building s390 target on x86_64 / Ubuntu machine: # Install x390x cross toolchain and headers $ sudo apt-get install gcc-s390x-linux-gnu g++-s390x-linux-gnu \ libc6-dev-s390x-cross linux-libc-dev-s390x-cross # Build with clang $ HOSTCC=clang CC=clang CXX=clang++ \ ARCH=s390 CROSS_COMPILE=s390x-linux-gnu- \ make -C tools/perf NO_LIBELF=1 NO_LIBTRACEEVENT=1 NO_LIBPYTHON=1 Signed-off-by: Leo Yan --- tools/perf/Makefile.config | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 5a5832ee7b53c604ec0d90c5ca7e2bee5bfa6a17..a2b5c291a364cbf331c16384764520dfe330a04c 100644 --- a/tools/perf/Makefile.config +++ b/tools/perf/Makefile.config @@ -23,8 +23,38 @@ HOSTCFLAGS := $(filter-out -Wnested-externs,$(EXTRA_WARNINGS)) # borrowed from kernel headers depends on it, e.g. put_unaligned_*(). CFLAGS += -fno-strict-aliasing -# Enabled Wthread-safety analysis for clang builds. +# Set target flag and options when using clang as compiler. ifeq ($(CC_NO_CLANG), 0) + CLANG_TARGET_FLAGS_arm := arm-linux-gnueabi + CLANG_TARGET_FLAGS_arm64 := aarch64-linux-gnu + CLANG_TARGET_FLAGS_m68k := m68k-linux-gnu + CLANG_TARGET_FLAGS_mips := mipsel-linux-gnu + CLANG_TARGET_FLAGS_powerpc := powerpc64le-linux-gnu + CLANG_TARGET_FLAGS_riscv := riscv64-linux-gnu + CLANG_TARGET_FLAGS_s390 := s390x-linux-gnu + CLANG_TARGET_FLAGS_x86 := x86_64-linux-gnu + + # Default to host architecture if ARCH is not explicitly given. + ifeq ($(ARCH),) + CLANG_TARGET_FLAGS := $(shell $(CLANG) -print-target-triple) + else + CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(ARCH)) + endif + + ifeq ($(CROSS_COMPILE),) + ifeq ($(CLANG_TARGET_FLAGS),) + $(error Specify CROSS_COMPILE or add CLANG_TARGET_FLAGS for $(ARCH)) + else + CLANG_FLAGS += --target=$(CLANG_TARGET_FLAGS) + endif # CLANG_TARGET_FLAGS + else + CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) + endif # CROSS_COMPILE + + CC := $(CLANG) $(CLANG_FLAGS) -fintegrated-as + CXX := $(CXX) $(CLANG_FLAGS) -fintegrated-as + + # Enabled Wthread-safety analysis for clang builds. CFLAGS += -Wthread-safety endif -- 2.34.1