From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793145881; b=P2I1PQpzX4Waaq6yR0WPRbTc25bUVAk9ajqUkO+L+QNpZ/0rkhFevY5YP698ENca1qxa V0Mul6u+rEIgyXKWwEPgMAX19Pilk31PKVRny3im6tGZs3sdsxQaomT9wmVT/pv/GCFQm U3h7t5iTq5CvSLIvSEvoSE9NaPBd6qYUUc8sTgMWKF/zBaVmmQqxqMCVEZ0l+Ub6tDATd mhQEzPl6/T9iCwPJaY6l+PiTHZzJqcMoxgICmMT/32Rja1gRu3oCkUeJM875D54nwTCa5 i/SfBJy+91QBUb704boIBRQAu5mvG8ZBuu7oTCozM3aNsJFcC8jZcOMBd3LVVT3YqQw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793145881; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-ID: X-Mailer:MIME-Version:Content-Transfer-Encoding; bh=e2Gu+WtYg+b+BufeEKwovfJrZnzsq5njm/Oj2WFts14=; b=Y3HXGbjHCDyDmYw2GK9uSjpc0oxX7MYeJoy+rmLWzEBWtyhgfikYn1X4kSVAJ3IdOv1d lU5NnQmWZq6Ot4xS3R2lZWBfEjvAgxsnwwnCux3wm9CsvwrPY2FV+jt+UE8vMoEBpED43 iDZfeLRsPaG3vy1SEIWHH9NprtOyyZqSeJFV3/IqJjb14iNrG8ELRwgUiBjLgHPSvVj4o QRvqX8059vFm+tEz6h+5f+KNAz8UZaYkniTBepvaJbToWPaP1A9Wg5uDzJjExS58ARvdf F+1pkXDRWl9qdL0hUghXN265S83ASv+t17o/qnweKX0xX2pDRN1/1dtBXz5SWQCeDcw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=Kvmhccb4; arc=none smtp.remote-ip=95.215.58.18 Received: from mta1.migadu.com (out-18.mta1.migadu.com [95.215.58.18]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A4942606A31D for ; Wed, 28 Oct 2026 00:04:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org A4942606A31D Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=Kvmhccb4 X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=HvXm1nkfB3D6+zLr/zpDnWhSj8kJjYR8mhYehTdnkX0=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1793145878; v=1; x=1793750678; b=Kvmhccb4kEUDhPlHiAivfPegqnm/It+jWq8C8UaIr/rdb+eTIOqJFzdFiCIaEw/mSVcNxswB q+EmWEDIZeRgAzt0/KUXVevCY3KEhPXJA1FEdkn7EOVwkxVpXubVBqG+/D6vS8msqZgq/uX8Vp0 jGtRac1hH1qOfrieXf9TfRU8= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id b5640d5ee54acd6a; Wed, 28 Oct 2026 00:04:38 +0000 X-Mizu-Trace-ID: b5640d5ee54acd6a X-Migadu-Flow: FLOW_OUT From: Vineet Gupta To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev, john.fastabend@gmail.com, shuah@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, jose.marchesi@oracle.com, david.faust@oss.qualcomm.com, Vineet Gupta Subject: [PATCH bpf-next v1 2/7] selftests/bpf: don't pass clang-only warning flags to GCC Date: Tue, 27 Oct 2026 17:04:06 -0700 Message-ID: <20261028000411.4010967-3-vineet.gupta@linux.dev> X-Mailer: git-send-email 2.56.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The clang only togges are passed to every BPF object build, including for BPF_GCC build. GCC accepts an unknown -Wno-foo silently until some other diagnostic fires, and then appends a note to it, so every warning in a bpf_gcc build comes with two lines of noise: cc1: note: unrecognized command-line option '-Wno-initializer-overrides' may have been intended to silence earlier diagnostics cc1: note: unrecognized command-line option '-Wno-microsoft-anon-tag' may have been intended to silence earlier diagnostics Collect them in CLANG_BPF_CFLAGS and hand them only to the clang flavors, through the per-flavor BPF_CC_FLAGS that Makefile.skel appends after BPF_CFLAGS. Only these two are clang-only; -Wno-compare-distinct-pointer-types and -fms-extensions are understood by GCC 14 and later and stay in BPF_CFLAGS. Signed-off-by: Vineet Gupta --- tools/testing/selftests/bpf/Makefile | 8 ++++---- tools/testing/selftests/bpf/Makefile.buildvars | 6 ++++-- 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index 1e4af62e8312..b5303c28973e 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -376,7 +376,7 @@ CLANG_TARGET_ARCH = --target=$(notdir $(CROSS_COMPILE:%-=%)) endif CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH)) -CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) +CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) $(CLANG_BPF_CFLAGS) # genkey writes both outputs. Pattern rules group them even on make # versions before 4.3, preventing concurrent genkey invocations. @@ -521,7 +521,7 @@ BINARY := test_progs BPF_CC := $(CLANG) BPF_CC_MSG := CLNG-BPF BPF_SYS_INCLUDES := $(CLANG_SYS_INCLUDES) -BPF_CC_FLAGS := -O2 $(BPF_TARGET_ENDIAN) -mcpu=v3 +BPF_CC_FLAGS := -O2 $(BPF_TARGET_ENDIAN) -mcpu=v3 $(CLANG_BPF_CFLAGS) BPF_DEFINES := -DENABLE_ATOMICS_TESTS include Makefile.skel @@ -537,12 +537,12 @@ $(OUTPUT)/test_progs: $(RUNNER_PREREQS) $(BPF_OBJS) $(ALL_SKELS) FORCE $(OUTPUT)/test_progs-no_alu32: $(RUNNER_PREREQS) FORCE +$(Q)$(RUNNER_MAKE) RUNNER=test_progs FLAVOR=no_alu32 TESTS_DIR=prog_tests \ - $(CLANG_RUNNER_ARGS) BPF_CC_FLAGS='-O2 $(BPF_TARGET_ENDIAN) -mcpu=v2' + $(CLANG_RUNNER_ARGS) BPF_CC_FLAGS='-O2 $(BPF_TARGET_ENDIAN) -mcpu=v2 $(CLANG_BPF_CFLAGS)' ifneq ($(CLANG_CPUV4),) $(OUTPUT)/test_progs-cpuv4: $(RUNNER_PREREQS) FORCE +$(Q)$(RUNNER_MAKE) RUNNER=test_progs FLAVOR=cpuv4 TESTS_DIR=prog_tests \ - $(CLANG_RUNNER_ARGS) BPF_CC_FLAGS='-O2 $(BPF_TARGET_ENDIAN) -mcpu=v4' \ + $(CLANG_RUNNER_ARGS) BPF_CC_FLAGS='-O2 $(BPF_TARGET_ENDIAN) -mcpu=v4 $(CLANG_BPF_CFLAGS)' \ BPF_DEFINES=-DENABLE_ATOMICS_TESTS endif diff --git a/tools/testing/selftests/bpf/Makefile.buildvars b/tools/testing/selftests/bpf/Makefile.buildvars index ff3476bc40a4..8ae2792c0c1e 100644 --- a/tools/testing/selftests/bpf/Makefile.buildvars +++ b/tools/testing/selftests/bpf/Makefile.buildvars @@ -157,13 +157,15 @@ BPF_CFLAGS = -g -Wall -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) \ -I$(abspath $(OUTPUT)/../usr/include) \ -std=gnu11 \ -fno-strict-aliasing \ - -Wno-microsoft-anon-tag \ -fms-extensions \ -Wno-compare-distinct-pointer-types \ - -Wno-initializer-overrides \ # # TODO: enable me -Wsign-compare +# Warning flags that only clang has. GCC accepts an unknown -Wno-foo +# silently and then notes it on the next diagnostic it emits. +CLANG_BPF_CFLAGS := -Wno-microsoft-anon-tag -Wno-initializer-overrides + VERIFY_SIG_SETUP := $(CURDIR)/verify_sig_setup.sh VERIFICATION_CERT := $(BUILD_DIR)/signing_key.der PRIVATE_KEY := $(BUILD_DIR)/signing_key.pem -- 2.53.0-Meta