From patchwork Thu Dec 16 16:38:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 525354 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85C38C43219 for ; Thu, 16 Dec 2021 16:50:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235280AbhLPQuv (ORCPT ); Thu, 16 Dec 2021 11:50:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239688AbhLPQuu (ORCPT ); Thu, 16 Dec 2021 11:50:50 -0500 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B0A2CC061746 for ; Thu, 16 Dec 2021 08:50:49 -0800 (PST) Received: by mail-wr1-x430.google.com with SMTP id c4so45299870wrd.9 for ; Thu, 16 Dec 2021 08:50:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=pJRqVurWv/xPXVPfg9RJJPd9MELUol7kDVQDIoB29M4=; b=j11Nk8Sqnke5x2cKuVDNGRjjHdUv65mw61hzMSDPnxhKxKjz9QpmvRbTOAP7PT0Qj4 lRXxMRjip+9dtbSJwULLTlpd8uQFObXQRsWQK8/SkwknGd8VnKGckm/sWIgoysHaC/Z8 HdC4fr9IHtl+IEBfF+F9+H/3xJPYuVVbF95I7BezfRE6DXptsOftO9AhzQ6zL24dejmq jSJY9DN376cNEDYkyJoBYBC9NY7VYUdMQyBdZH/81RjvIU84Yl1ebNqL7SVO3KFoofjN 8moq9RwIwng4+LkWkIyMunWctj6e/4mQi717khuAB1ziYwlG6OJGS4YONFdZQtSx0VUB j5OA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=pJRqVurWv/xPXVPfg9RJJPd9MELUol7kDVQDIoB29M4=; b=r1TwzHqN7XAjtSZfXlHx3pJBBNaSW7LzDmKIqqmUudVGJujy4cKQ4O9i5G604bK/Py Ay/5hCD5yWIlSYFoadiFICAzErY85qqZ/3yikbEu7Uy5bf8XiovPsiI6sHRA0geK0CWs MFaOug2CuuC1907Y+DsHFYo+5ckwAR1tHWi6L1rMgD09pmroOTqX4i2oXyjhaXqa0bMU jX9ha7iR3stjilOYouQEkB/t9VfJdC6z4HrhjaS4CpO0BTgYC+AZgfVyBA0rzR1Wp/r+ 0VTFSUV4Ug2PHim4MPLDBMY04DbL96rCuj+oMXKEKWb444VPXJDJycR27DKTn/B7oQ0w bKMQ== X-Gm-Message-State: AOAM531pcay7r9HVODa9J65QyBK3n0ciRXDoTygAqlWwFG5Lz0e3CCo+ 47714I3RLG7tSCWid6epGCsB7w== X-Google-Smtp-Source: ABdhPJxzwdAAnWi1SsHBCOcf33UW6I563gS8lB7I43K9co91J+vPwBcD4O7ZqVJpBGGrEwajiLNvbw== X-Received: by 2002:adf:f708:: with SMTP id r8mr10213612wrp.198.1639673448266; Thu, 16 Dec 2021 08:50:48 -0800 (PST) Received: from localhost.localdomain (cpc92880-cmbg19-2-0-cust679.5-4.cable.virginm.net. [82.27.106.168]) by smtp.gmail.com with ESMTPSA id y15sm7438906wry.72.2021.12.16.08.50.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Dec 2021 08:50:47 -0800 (PST) From: Jean-Philippe Brucker To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, shuah@kernel.org, nathan@kernel.org, ndesaulniers@google.com Cc: kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, quentin@isovalent.com, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, llvm@lists.linux.dev, Jean-Philippe Brucker Subject: [PATCH bpf-next v2 2/6] tools/resolve_btfids: Support cross-building the kernel with clang Date: Thu, 16 Dec 2021 16:38:39 +0000 Message-Id: <20211216163842.829836-3-jean-philippe@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211216163842.829836-1-jean-philippe@linaro.org> References: <20211216163842.829836-1-jean-philippe@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The CROSS_COMPILE variable may be present during resolve_btfids build if the kernel is being cross-built. Since resolve_btfids is always executed on the host, we set CC to HOSTCC in order to use the host toolchain when cross-building with GCC. But instead of a toolchain prefix, cross-build with clang uses a "-target" parameter, which Makefile.include deduces from the CROSS_COMPILE variable. In order to avoid cross-building libbpf, clear CROSS_COMPILE before building resolve_btfids. Acked-by: Quentin Monnet Signed-off-by: Jean-Philippe Brucker --- tools/bpf/resolve_btfids/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/bpf/resolve_btfids/Makefile b/tools/bpf/resolve_btfids/Makefile index 751643f860b2..9ddeca947635 100644 --- a/tools/bpf/resolve_btfids/Makefile +++ b/tools/bpf/resolve_btfids/Makefile @@ -19,6 +19,7 @@ CC = $(HOSTCC) LD = $(HOSTLD) ARCH = $(HOSTARCH) RM ?= rm +CROSS_COMPILE = OUTPUT ?= $(srctree)/tools/bpf/resolve_btfids/