From nobody Wed Dec 17 15:35:01 2025 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AFB5813AA45 for ; Mon, 15 Jul 2024 20:33:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721075630; cv=none; b=dUb4wOOLt8ZnCzYaz6Y4gpxLSeOO4gHYs7PBbIrKUkBG+gM9oHqxi9UbbhoAf54g1QH+IHlOuA+uk1tmXUErYT9b+FkigbP0dlgKFYZUvCQl+n2g+fSMhm70TzM7okSCNqssN/gUfKdNqDOBSCyMuPO5ffCaabWRAbsRNYtKd6o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721075630; c=relaxed/simple; bh=OtjVNwo381SC/keZfjeduCwHTRDWCVPReYZb0X3r5SY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HXFywl6jm5oHaruV3uqbE+Ym78o78vtsMyxVHuIgJ1mSBo7MWEMF+QdzP+0jYZCzFXgVLMRH2BFiDIzUoVfexJOBp2+b/5fLR5maFvs1GukGCHg5fEnBclf8JQTYTiBKNoFahPwjkHctA9/HpLkIwqUGDBDp4iNUg0dWpXYmanI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=RuqCN2nK; arc=none smtp.client-ip=209.85.214.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="RuqCN2nK" Received: by mail-pl1-f181.google.com with SMTP id d9443c01a7336-1fb4a807708so42282865ad.2 for ; Mon, 15 Jul 2024 13:33:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1721075628; x=1721680428; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=fV8GQ3sNmW9UM2g7XLCappSiUKhDHjx9Q2PF1jfbifQ=; b=RuqCN2nKYmAeFZeV5ORARlvFXdYTO58s/TEUh+/PWf+++qzABqrk+aSp4p7Q5VeUXk VMB5cJ5euX2BFh0p70PjMxR6ajgFR5pjupEA2vj5+CL/HXoMC2arkEhjgEIM0GI/vPTv Q+1RldTDreJ+TNOdFBN+oVPV6cJxuKOoVvAKY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1721075628; x=1721680428; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=fV8GQ3sNmW9UM2g7XLCappSiUKhDHjx9Q2PF1jfbifQ=; b=jbp9UxJgeftbV98OwLrsj4i3l31L1GYbUOphtZ7xTSo7l3rMJ18jIZAIZXA+cOjg2L ZBnyFSndqwa6lNTJ+Hwa5y3TtZlIx4HF2kx73b6vr2QD4DTKK9OGCpa6NoWwgu7phtm8 wGdzXlrIhPALA4gxx5tKUefNB7Zuja3y0E33S9GkyAcgvMUe9eh8Uvsi4twt0livlj3R bODNFkN6gPUoywLm1rvEczyTwT2jDCwHVWILXMizKBxb19N6NuPpIQBKbyMvG/OaLJo/ O/ZOB6Aq1gHwBtnOwV35+1etOXUVAV04z2CJJy3zFUgwlLiblVxKFUsejSRrPy7UHX17 PEHw== X-Gm-Message-State: AOJu0YypnwbY94YJtSyvzUb2DYanH/mOiNW4RZnADYjRmdoZF07ughm0 Z5qni9Eh+sxOC+6xmhEoRwB37OW/K9CyYmG6qM8jKzXQpfqNq7BDYpmWoebdmw== X-Google-Smtp-Source: AGHT+IFRhxgNHjtN3riipF2pMHlSVgaaC2CKlJ6yHHSh/TXqNehk7BJcZJvHPomUNrJFu/h5juOz3w== X-Received: by 2002:a17:902:ea07:b0:1fb:75b6:a43d with SMTP id d9443c01a7336-1fbb6d4c958mr208021045ad.32.1721075628124; Mon, 15 Jul 2024 13:33:48 -0700 (PDT) Received: from localhost ([2620:15c:9d:2:9b77:1ea5:9de2:19a3]) by smtp.gmail.com with UTF8SMTPSA id d9443c01a7336-1fc0bb9bf42sm45317405ad.79.2024.07.15.13.33.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 15 Jul 2024 13:33:47 -0700 (PDT) From: Brian Norris To: Arnaldo Carvalho de Melo , Namhyung Kim , Ian Rogers , Thomas Richter , Josh Poimboeuf , Peter Zijlstra Cc: linux-kernel@vger.kernel.org, Masahiro Yamada , bpf@vger.kernel.org, linux-kbuild@vger.kernel.org, Brian Norris , Jiri Olsa Subject: [PATCH v4 1/3] tools build: Correct libsubcmd fixdep dependencies Date: Mon, 15 Jul 2024 13:32:42 -0700 Message-ID: <20240715203325.3832977-2-briannorris@chromium.org> X-Mailer: git-send-email 2.45.2.993.g49e7a77208-goog In-Reply-To: <20240715203325.3832977-1-briannorris@chromium.org> References: <20240715203325.3832977-1-briannorris@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" All built targets need fixdep to be built first, before handling object dependencies [1]. We're missing one such dependency before the libsubcmd target. This resolves .cmd file generation issues such that the following sequence produces many fewer results: $ git clean -xfd tools/ $ make tools/objtool $ grep "cannot find fixdep" $(find tools/objtool -name '*.cmd') In particular, only a buggy tools/objtool/libsubcmd/.fixdep.o.cmd remains, due to circular dependencies of fixdep on itself. Such incomplete .cmd files don't usually cause a direct problem, since they're designed to fail "open", but they can cause some subtle problems that would otherwise be handled by proper fixdep'd dependency files. [2] [1] This problem is better described in commit abb26210a395 ("perf tools: Force fixdep compilation at the start of the build"). I don't apply its solution here, because additional recursive make can be a bit of overkill. [2] Example failure case: cp -arl linux-src linux-src2 cd linux-src2 make O=3D/path/to/out cd ../linux-src rm -rf ../linux-src2 make O=3D/path/to/out Previously, we'd see errors like: make[6]: *** No rule to make target '/path/to/linux-src2/tools/include/linux/compiler.h', needed by '/path/to/out/tools/bpf/resolve_btfids/libsubcmd/exec-cmd.o'. Stop. Now, the properly-fixdep'd .cmd files will ignore a missing /path/to/linux-src2/... Link: https://lore.kernel.org/all/ZGVi9HbI43R5trN8@bhelgaas/ Link: https://lore.kernel.org/all/Zk-C5Eg84yt6_nml@google.com/ Signed-off-by: Brian Norris Acked-by: Jiri Olsa --- (no changes since v3) Changes in v3: - update notes about failure cases - add Jiri's Acked-by tools/lib/subcmd/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/lib/subcmd/Makefile b/tools/lib/subcmd/Makefile index b87213263a5e..59b09f280e49 100644 --- a/tools/lib/subcmd/Makefile +++ b/tools/lib/subcmd/Makefile @@ -76,7 +76,7 @@ include $(srctree)/tools/build/Makefile.include =20 all: fixdep $(LIBFILE) =20 -$(SUBCMD_IN): FORCE +$(SUBCMD_IN): fixdep FORCE @$(MAKE) $(build)=3Dlibsubcmd =20 $(LIBFILE): $(SUBCMD_IN) --=20 2.45.2.993.g49e7a77208-goog