From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 411E52EA75D; Thu, 25 Sep 2025 10:42:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758796965; cv=none; b=DyaaTQxCHGr+CYcDECr9O4wBmWtGYCtZcVd8U0bEgwM9rHeIbNOw/NKlUR9azBqwVF51hYdoABropa3l5iR1+hFJL789r9voOQoHCB9ZdGLjf8rfeBAsnReG3tXB/A+BJO9cs/Kc4ZcLoR6QyhNXwyx6E6+BA+4b41d89JO9YoE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758796965; c=relaxed/simple; bh=u7U036YsC/tIgi4yAuDO4E7PAwS1xrqPfbasQ3Ujv/c=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=AOgQgnj9kN59y67Xzlw5dC4Sm9wHtz7Dxs/D3eUYzZz3nId+gZEfNYRPAjf/5AxVfGuxI4CVe9/xDLY1iAQoP0JTYveKmSdWFT7WnEYk2cF79W35rAy6/m7GzMNMeYEEEag7v2z3c9h6p0P/EtIAmjnjF4TIIpApAfmiTA2ccZk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mvgxOavW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mvgxOavW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 18F94C4CEF0; Thu, 25 Sep 2025 10:42:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758796964; bh=u7U036YsC/tIgi4yAuDO4E7PAwS1xrqPfbasQ3Ujv/c=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=mvgxOavWfD6J4ad9MTct4h8LxkO2Guaq6oV6qdIL8WtJJ4A2XtpXe2LDojmrgZvWL bffdvw0+5uQ9ni6ma+SAzYm/e78N9pKeYo8OpXx1nJXdSivdVOAtmF91Ujw1Sf4C6x w+VLvkS8Cae3q5EDULHiOy/dHEhDX1kVj+DM72LAf3eBnOgiDyW2A8a9CYn7eDEWw4 Q3slXhA8GCrgRKj5smw4f8zEqkVnOage9LNOZx6aeFmOqbnh0Po2pNMNZgGmSpXFKG rDYAe5pnd9mgaWeCTqC3hKrU2J4HOx6JzQ8PQhcI97WTqoPEHHpg5f0PNawvzuMTyR UaywVVAN+uMgA== Message-ID: <52fe87ef-0797-4cf1-9e70-dc218f904e77@kernel.org> Date: Thu, 25 Sep 2025 11:42:39 +0100 Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/8] bpftool: Conditionally add -Wformat-signedness flag To: Leo Yan , Arnaldo Carvalho de Melo , Namhyung Kim , Jiri Olsa , Ian Rogers , Adrian Hunter , 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 References: <20250925-perf_build_android_ndk-v1-0-8b35aadde3dc@arm.com> <20250925-perf_build_android_ndk-v1-3-8b35aadde3dc@arm.com> From: Quentin Monnet Content-Language: en-GB In-Reply-To: <20250925-perf_build_android_ndk-v1-3-8b35aadde3dc@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 2025-09-25 11:26 UTC+0100 ~ Leo Yan > clang-18.1.3 on Ubuntu 24.04.2 reports warning: > > warning: unknown warning option '-Wformat-signedness' [-Wunknown-warning-option] > > Conditionally add the option only when it is supported by compiler. > > Signed-off-by: Leo Yan Hi, how annoying is this warning? I'm asking because as far as I understand, the option has been introduced in LLVM 19.1.0 [0] - the latest being 21.1.0 already - so we won't need this check once distros have transitioned, and I'm a bit reluctant to add it. Quentin [0] https://github.com/llvm/llvm-project/commit/ea92b1f9d0fc31f1fd97ad04eb0412003a37cb0d