From nobody Mon Dec 8 11:02:59 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 6A8212DECA0; Mon, 6 Oct 2025 16:22:02 +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=1759767724; cv=none; b=WpKhE+d+kgdXvjYHf2DKUSJPQP4DZEKwhGo0sc7/O+3AApPsx51hyC3tkQab+GJFOD8E6QpFjERRygfLAmnqHzRnw9dz0f2Qqy7KK0fbJvI0EW2AqUJF2KyYTYDacZdTPjRF2SDcBctuYgXjJhgc1hUBcy/JFZxtUqYUoc32pUE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759767724; c=relaxed/simple; bh=wkvR3xgU9zsjoyU6Z+96rh2Bwjg67hx/XgTNQZzIguQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=o43AQTgX0ULSTpoFps05/hrp9ubwTLeR7R03aIihRM8476ZDwWuOateAdj83y4s1H81PEM26em8sfIg2ajnHY5uVpxK9w3F98pP0f1Pa7QThfTjf8rC8eGouujZqpkrMMmhbZo5iG9V8bjqTcXJgplWW0pXXmrvYAd09K5gD4Jk= 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 EA6961516; Mon, 6 Oct 2025 09:21:53 -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 605F73F738; Mon, 6 Oct 2025 09:21:59 -0700 (PDT) From: Leo Yan Date: Mon, 06 Oct 2025 17:21:30 +0100 Subject: [PATCH v3 8/9] perf build: Support build with clang Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251006-perf_build_android_ndk-v3-8-4305590795b2@arm.com> References: <20251006-perf_build_android_ndk-v3-0-4305590795b2@arm.com> In-Reply-To: <20251006-perf_build_android_ndk-v3-0-4305590795b2@arm.com> To: Arnaldo Carvalho de Melo , Namhyung Kim , Jiri Olsa , Ian Rogers , Adrian Hunter , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , James Clark Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, llvm@lists.linux.dev, linux-riscv@lists.infradead.org, Leo Yan X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1759767696; l=2815; i=leo.yan@arm.com; s=20250604; h=from:subject:message-id; bh=wkvR3xgU9zsjoyU6Z+96rh2Bwjg67hx/XgTNQZzIguQ=; b=/XWpMHeWTC73xiF7JjyT34LymlXXmT3i4DbrxJQQFnXHHoOY+du9YQ9nZamPxUiUN3H5F/yX3 kr/f0rOif9tD/Tc37CZFro3HV5ftH5Nih62dOt8yPUFj9yXH20hWjVa 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=3Dclang CC=3Dclang CXX=3Dclang++ 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=3Dclang CC=3Dclang CXX=3Dclang++ \ ARCH=3Ds390 CROSS_COMPILE=3Ds390x-linux-gnu- \ make -C tools/perf NO_LIBELF=3D1 NO_LIBTRACEEVENT=3D1 NO_LIBPYTHON=3D1 Signed-off-by: Leo Yan --- tools/perf/Makefile.config | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 5a5832ee7b53c604ec0d90c5ca7e2bee5bfa6a17..616e71b3d897493a2b14612cdcf= 4a872e2296f4d 100644 --- a/tools/perf/Makefile.config +++ b/tools/perf/Makefile.config @@ -23,8 +23,39 @@ HOSTCFLAGS :=3D $(filter-out -Wnested-externs,$(EXTRA_WA= RNINGS)) # borrowed from kernel headers depends on it, e.g. put_unaligned_*(). CFLAGS +=3D -fno-strict-aliasing =20 -# Enabled Wthread-safety analysis for clang builds. +# Set target flag and options when using clang as compiler. ifeq ($(CC_NO_CLANG), 0) + CLANG_TARGET_FLAGS_arm :=3D arm-linux-gnueabi + CLANG_TARGET_FLAGS_arm64 :=3D aarch64-linux-gnu + CLANG_TARGET_FLAGS_m68k :=3D m68k-linux-gnu + CLANG_TARGET_FLAGS_mips :=3D mipsel-linux-gnu + CLANG_TARGET_FLAGS_powerpc :=3D powerpc64le-linux-gnu + CLANG_TARGET_FLAGS_riscv :=3D riscv64-linux-gnu + CLANG_TARGET_FLAGS_s390 :=3D s390x-linux-gnu + CLANG_TARGET_FLAGS_x86 :=3D x86_64-linux-gnu + CLANG_TARGET_FLAGS_x86_64 :=3D x86_64-linux-gnu + + # Default to host architecture if ARCH is not explicitly given. + ifeq ($(ARCH), $(HOSTARCH)) + CLANG_TARGET_FLAGS :=3D $(shell $(CLANG) -print-target-triple) + else + CLANG_TARGET_FLAGS :=3D $(CLANG_TARGET_FLAGS_$(ARCH)) + endif + + ifeq ($(CROSS_COMPILE),) + ifeq ($(CLANG_TARGET_FLAGS),) + $(error Specify CROSS_COMPILE or add CLANG_TARGET_FLAGS for $(ARCH)) + else + CLANG_FLAGS +=3D --target=3D$(CLANG_TARGET_FLAGS) + endif # CLANG_TARGET_FLAGS + else + CLANG_FLAGS +=3D --target=3D$(notdir $(CROSS_COMPILE:%-=3D%)) + endif # CROSS_COMPILE + + CC :=3D $(CLANG) $(CLANG_FLAGS) -fintegrated-as + CXX :=3D $(CXX) $(CLANG_FLAGS) -fintegrated-as + + # Enabled Wthread-safety analysis for clang builds. CFLAGS +=3D -Wthread-safety endif =20 --=20 2.34.1