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[192.35.17.14]) by gmr-mx.google.com with ESMTPS id n6si694581lft.8.2021.09.13.11.16.54 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 Sep 2021 11:16:54 -0700 (PDT) Received-SPF: pass (google.com: domain of jan.kiszka@siemens.com designates 192.35.17.14 as permitted sender) client-ip=192.35.17.14; Authentication-Results: gmr-mx.google.com; spf=pass (google.com: domain of jan.kiszka@siemens.com designates 192.35.17.14 as permitted sender) smtp.mailfrom=jan.kiszka@siemens.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=siemens.com Received: from mail2.sbs.de (mail2.sbs.de [192.129.41.66]) by david.siemens.de (8.15.2/8.15.2) with ESMTPS id 18DIGsJi021327 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 13 Sep 2021 20:16:54 +0200 Received: from [139.22.39.76] ([139.22.39.76]) by mail2.sbs.de (8.15.2/8.15.2) with ESMTP id 18DIGr2o007214; Mon, 13 Sep 2021 20:16:53 +0200 Subject: Re: [PATCH 2/2] doc: Add section about ccache usage To: Uladzimir Bely , isar-users@googlegroups.com References: <20210913151009.28655-1-ubely@ilbers.de> <20210913151009.28655-3-ubely@ilbers.de> From: Jan Kiszka Message-ID: <63e43baf-4432-5e8a-18ed-ecf071f04fd9@siemens.com> Date: Mon, 13 Sep 2021 20:16:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20210913151009.28655-3-ubely@ilbers.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TUID: YrjLruOF/Zsw On 13.09.21 17:10, Uladzimir Bely wrote: > Signed-off-by: Uladzimir Bely > --- > doc/user_manual.md | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/doc/user_manual.md b/doc/user_manual.md > index 1da0e9d..903f9ae 100644 > --- a/doc/user_manual.md > +++ b/doc/user_manual.md > @@ -18,6 +18,7 @@ Copyright (C) 2016-2019, ilbers GmbH > - [Add a New Image Type](#add-a-new-image-type) > - [Add a Custom Application](#add-a-custom-application) > - [Enabling Cross-compilation](#isar-cross-compilation) > + - [Using ccache for custom packages](#using-ccache-for-custom-packages) > - [Create an ISAR SDK root filesystem](#create-an-isar-sdk-root-filesystem) > - [Create a containerized Isar SDK root filesystem](#create-a-containerized-isar-sdk-root-filesystem) > - [Creation of local apt repo caching upstream Debian packages](#creation-of-local-apt-repo-caching-upstream-debian-packages) > @@ -896,6 +897,21 @@ package build. To invoke it, just call > `bitbake mc:${MACHINE}-${DISTRO}: -c devshell`. > > > +## Using ccache for custom packages > + > +While base system is created from binary debian repositories, some user > +packages are built from sources. It's possible to reduce build time > +for such packages by enabling ccache. > + > +To enable global ccache functionality, `INHERIT += ccache` can be added > +to `local.conf`. If some package requires ccache to be always disabled, > +`CCACHE_DISABLE = '1'` can be used in the recipe. Why so complex? ISAR_CROSS_COMPILE is managed with a single variable, including per-recipe out-out/in. Would be better to follow that pattern consistently. > + > +By default, ccache directory is created inside `TMPDIR`, but it can be > +adjusted by `CCACHE_TOP_DIR` variable in `local.conf`. Ccache directory > +`CCACHE_DIR` default value is `"${CCACHE_TOP_DIR}/${DISTRO}-${MACHINE}"`, DISTRO-DISTRO_ARCH, just like for other cachings. There is nothing machine-specific in the cache. Jan > +that means caches for different distros and machines are not overlapped. > + > ## Create an ISAR SDK root filesystem > > ### Motivation > -- Siemens AG, T RDA IOT Corporate Competence Center Embedded Linux