yannstatic/static/2019/12/25/BuildRoot.html

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<!DOCTYPE html><html lang="fr">
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<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"><title>BuildRoot - YannStatic</title>
<meta name="description" content="BuildRoot">
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<script>
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resultsContainer: document.getElementById('results-container'),
json: '/search.json',
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searchResultTemplate: '<li><a href="{url}">{date}&nbsp;{title}</a></li>'
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<!-- Fin déclaration champ de recherche --></div><nav class="navigation">
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<article itemscope itemtype="http://schema.org/Article"><div class="article__header"><header><h1 style="color:Tomato;">BuildRoot</h1></header></div><meta itemprop="headline" content="BuildRoot"><div class="article__info clearfix"><ul class="left-col menu"><li>
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<i class="far fa-calendar-alt"></i>&nbsp;<span title="Création" style="color:#FF00FF">25&nbsp;déc.&nbsp;&nbsp;2019</span>
<span title="Modification" style="color:#00FF7F">28&nbsp;nov.&nbsp;&nbsp;2018</span></li></ul></div><meta itemprop="datePublished" content="2018-11-28T00:00:00+01:00">
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<summary><b>Afficher/cacher Sommaire</b></summary>
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</details><h2 id="buildroot">BuildRoot</h2>
<p><img src="/images/linux-embedded.jpg" alt="buildroot" width="20%" /><br />
<a href="https://buildroot.org/">https://buildroot.org/</a></p>
<p>Largement inspiré de l article <a href="https://www.blaess.fr/christophe/2015/12/08/creation-dun-systeme-complet-avec-buildroot/">Création dun système complet avec Buildroot</a> de <a href="https://www.blaess.fr/christophe/">Christophe Blaess</a> <em>Ingénierie et formations sur les systèmes libres</em></p>
<ul>
<li>Préparer une chaîne de cross-compilation</li>
<li>Construire un système minimal</li>
<li>Générer un système personnalisé</li>
</ul>
<p>Répertoire de base : <strong>/mnt/dplus</strong> ou <strong>~/media/dplus</strong><br />
Installer cpio : <code class="language-plaintext highlighter-rouge">yay -S cpio</code></p>
<h3 id="environnement-de-travail">Environnement de travail</h3>
<p>Créer une arborescence de travail qui contiendra tous les fichiers personnalisés, les répertoires de construction, la chaîne de compilation, etc.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>mkdir br-tree
cd br-tree
</code></pre></div></div>
<p>Au sein de cet environnement, nous allons essayer de respecter lorganisation des fichiers proposée par le projet Buildroot : une arborescence board/ contenant un sous-répertoire pour chaque carte que nous supporterons (ici le Raspberry Pi 3 uniquement). Tous nos fichiers personnalisés se trouveront dans cette sous-arborescence.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>mkdir -p board/rpi-3/
</code></pre></div></div>
<p>Nous téléchargeons les sources de la dernière version de Buildroot, les décompressons et entrons dans ce répertoire :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>wget https://buildroot.org/downloads/buildroot-2018.08.tar.bz2
tar xf buildroot-2018.08.tar.bz2
cd buildroot-2018.08/
</code></pre></div></div>
<h3 id="toolchain">Toolchain</h3>
<p>Jai lhabitude de commencer mes projets embarqués par la construction dune toolchain de cross-compilation. Il sagit dobtenir un compilateur et tous les outils associés fonctionnant sur la machine de développement (un PC par exemple) et produisant du code pour la plate-forme cible (ici le Raspberry Pi 3).</p>
<p>Il est tout à fait possible de se procurer une toolchain pré-compilée, mais je trouve quil est dommage de se priver de cette étape de construction, dautant que cela nous permet de maîtriser exactement les versions de la bibliothèque C, du noyau, des outils, etc. que nous souhaitons.</p>
<p>Si jisole cette étape de la production du système complet, cest quelle prend un temps significatif (une vingtaine de minutes sur un petit processeur i7 avec une connexion Internet fibre). La toolchain est donc compilée et installée une fois pour toutes, et ne sera plus modifiée même si nous réitérons autant de génération du système que nous le désirons.</p>
<p>Jai lhabitude de placer la toolchain dans le répertoire <strong>board/\target\/cross</strong>.</p>
<p>Pour produire la toolchain, nous demandons une configuration de Buildroot par défaut pour la cible choisie, et lélaguons pour ne laisser que la production du compilateur et de ses outils. Les configurations par défaut disponibles sont visibles dans le sous-répertoire configs/. Nous choisissons celle pour Raspberry Pi 3.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>make raspberrypi3_defconfig
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>#
# configuration written to /mnt/dplus/br-tree/buildroot-2018.08/.config
#
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>make menuconfig
</code></pre></div></div>
<p>Voici la liste des modifications apportées :</p>
<ul>
<li>Menu <strong>Target options</strong> : pas de changement, mais on peut en profiter pour observer et vérifier le support du processeur cible.</li>
<li>Menu <strong>Build options</strong> :
* <strong>Download dir</strong> : nous extrayons de larborescence de Buildroot ce répertoire dans lequel il stocke les fichiers téléchargés. Ainsi les compilations successives ne nécessiterons pas de nouveaux téléchargements. Nouvelle valeur : <strong>$(TOPDIR)/../dl</strong>
* <strong>Host dir</strong> : lemplacement où se trouvera la toolchain compilée. Comme indiqué plus haut, jai pour habitude de la placer dans le répertoire board/<target>/cross de notre arborescence de travail. Nouveau chemin : **$(TOPDIR)/../board/rpi-3/cross**</target></li>
<li>Menu <strong>Toolchain</strong> :
* <strong>C library</strong> : cest un choix qui dépend beaucoup du code métier. La bibliothèque C est un point-clé du système ; cest elle qui permet dentrer dans le noyau pour bénéficier de ses services (appels-système). Pour être le plus générique possible, nous choisissons la Gnu C library, un peu plus volumineuse que les autres, mais plus riche également. Nouvelle valeur : <strong>glibc</strong>
* <strong>Custom kernel headers series</strong> : la compilation de la bibliothèque C nécessite de charger les fichiers headers du noyau afin de connaître ses points dentrée (<a href="https://www.blaess.fr/christophe/2014/04/05/utiliser-un-appel-systeme-inconnu-de-la-libc/">voir cet article pour plus de détails</a>). Par défaut Buildroot utilise la même version de noyau que celui qui sera construit pour le système (Linux 4.9.x). Toutefois nous nallons pas compiler tout de suite de noyau aussi se rabat-il sur la version la plus récente quil connaît (Linux 4.15.x) pour produire la libC. Si nous laissons en létat, une fois que nous aurons compilé tout le système et booterons le Raspberry Pi 3, la GlibC compilée pour un 4.15 refusera de sinitialiser sur un 4.9. et affichera le message “Kernel too old” avant quun Kernel Panic se produise puisque le processus init ne peut démarrer. Nouvelle valeur : <strong>Linux 4.9.x kernel headers</strong>. Le menu Custom kernel headers series disparaît alors.
* <strong>Build cross gdb for the host</strong> : en prévision des éventuelles séances de débogage distant du code applicatif, jajoute dans la toolchain un débogueur qui fonctionne sur PC mais peut analyser du code au format de la cible. Nouvelle valeur : <strong>[*] Build cross gdb for the host</strong>.</li>
<li>Menu <strong>System configuration</strong> :
* <strong>Init system</strong> : cette option contient au préalable BusyBox mais nous la désactivons pour pouvoir éliminer ce package. Nouvelle valeur : <strong>None</strong>
* <strong>Custom scripts to run before creating filesystem images</strong> : nous nallons pas produire de système complet, il ne faut donc pas lancer le script qui finalise larborescence avant de créer les images des systèmes de fichiers. Nouvelle valeur : <strong>()</strong>.
* <strong>Custom scripts to run after creating filesystem images</strong> : pour la même raison nous ne lançons pas le script qui assemble les images des systèmes de fichiers pour créer une image complète de la carte microSD pour Raspberry Pi. Nouvelle valeur : <strong>()</strong>.</li>
<li>Menu <strong>Kernel</strong> :
* <strong>Linux Kernel</strong> : nous ne voulons, dans un premier temps, produire que la toolchain et rien dautre. Nous désactivons cette option. Nouvelle valeur : <strong>[ ]</strong></li>
<li>Menu <strong>Target packages</strong> :
* BusyBox : cest le seul package initialement présent. Nous le désactivons. Nouvelle valeur : <strong>[ ]</strong></li>
<li>Menu <strong>Filesystem images</strong> :
* <strong>ext2/3/4 root filesystem</strong> : inutile, nous ne voulons pas de filesystem pour le moment. Nouvelle valeur : <strong>[ ]</strong></li>
<li>Menu <strong>Legacy config options</strong> : Je jette toujours un œil à ce menu lorsque jutilise une nouvelle version de Buildroot avec un fichier de configuration pré-existant car il nous indique les fonctionnalités incompatibles (modifiées, disparues, etc.) entre deux versions.
Comme nous avons généré un fichier de configuration “from scratch“, ce nest pas nécessaire ici.</li>
</ul>
<p>Sauvegardons la configuration et lançons la compilation. Une nouvelle cible de compilation “toolchain” est disponible depuis quelques versions de Buildroot. Je suppose que certaines de nos modifications dans les menus “System configuration“, “Kernel” et “Target Packages” sont redondantes avec cette nouvelle cible mais je préfère les appliquer quand même.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cp .config ../board/rpi-3/buildroot-2018.08-toolchain.config
make toolchain # patienter de 5 à 20 minutes (suivant processeur)
</code></pre></div></div>
<p>Au terme de la compilation</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>-e 's#@@STAGING_SUBDIR@@#arm-buildroot-linux-gnueabihf/sysroot#'
-e 's#@@TARGET_CFLAGS@@#-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os#'
-e 's#@@TARGET_CXXFLAGS@@#-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os#'
-e 's#@@TARGET_FCFLAGS@@#-Os#' -e 's#@@TARGET_LDFLAGS@@##'
-e 's#@@TARGET_CC@@#bin/arm-buildroot-linux-gnueabihf-gcc#'
-e 's#@@TARGET_CXX@@#bin/arm-buildroot-linux-gnueabihf-g++#'
-e 's#@@TARGET_FC@@#bin/arm-buildroot-linux-gnueabihf-gfortran#'
-e 's#@@CMAKE_SYSTEM_PROCESSOR@@#armv8l#' -e 's#@@TOOLCHAIN_HAS_FORTRAN@@#0#'
-e 's#@@CMAKE_BUILD_TYPE@@#Release#'
/mnt/dplus/br-tree/buildroot-2018.08/support/misc/toolchainfile.cmake.in &gt; /mnt/dplus/br-tree/buildroot-2018.08/../board/rpi-3/cross/share/buildroot/toolchainfile.cmake
</code></pre></div></div>
<p>Vérifions la toolchain produite :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cd ..
ls board/rpi-3/cross/usr/bin/
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>arm-buildroot-linux-gnueabihf-addr2line arm-buildroot-linux-gnueabihf-gcc arm-buildroot-linux-gnueabihf-nm arm-linux-c++filt arm-linux-gcc-ranlib arm-linux-size
arm-buildroot-linux-gnueabihf-ar arm-buildroot-linux-gnueabihf-gcc-7.3.0 arm-buildroot-linux-gnueabihf-objcopy arm-linux-cc arm-linux-gcc.br_real arm-linux-strings
arm-buildroot-linux-gnueabihf-as arm-buildroot-linux-gnueabihf-gcc-7.3.0.br_real arm-buildroot-linux-gnueabihf-objdump arm-linux-cc.br_real arm-linux-gcov arm-linux-strip
arm-buildroot-linux-gnueabihf-c++ arm-buildroot-linux-gnueabihf-gcc-ar arm-buildroot-linux-gnueabihf-ranlib arm-linux-cpp arm-linux-gcov-dump bison
arm-buildroot-linux-gnueabihf-c++.br_real arm-buildroot-linux-gnueabihf-gcc-nm arm-buildroot-linux-gnueabihf-readelf arm-linux-cpp.br_real arm-linux-gcov-tool gawk
arm-buildroot-linux-gnueabihf-c++filt arm-buildroot-linux-gnueabihf-gcc-ranlib arm-buildroot-linux-gnueabihf-size arm-linux-elfedit arm-linux-gprof lzip
arm-buildroot-linux-gnueabihf-cc arm-buildroot-linux-gnueabihf-gcc.br_real arm-buildroot-linux-gnueabihf-strings arm-linux-g++ arm-linux-ld m4
arm-buildroot-linux-gnueabihf-cc.br_real arm-buildroot-linux-gnueabihf-gcov arm-buildroot-linux-gnueabihf-strip arm-linux-g++.br_real arm-linux-ld.bfd tar
arm-buildroot-linux-gnueabihf-cpp arm-buildroot-linux-gnueabihf-gcov-dump arm-linux-addr2line arm-linux-gcc arm-linux-nm toolchain-wrapper
arm-buildroot-linux-gnueabihf-cpp.br_real arm-buildroot-linux-gnueabihf-gcov-tool arm-linux-ar arm-linux-gcc-7.3.0 arm-linux-objcopy yacc
arm-buildroot-linux-gnueabihf-elfedit arm-buildroot-linux-gnueabihf-gprof arm-linux-as arm-linux-gcc-7.3.0.br_real arm-linux-objdump
arm-buildroot-linux-gnueabihf-g++ arm-buildroot-linux-gnueabihf-ld arm-linux-c++ arm-linux-gcc-ar arm-linux-ranlib
arm-buildroot-linux-gnueabihf-g++.br_real arm-buildroot-linux-gnueabihf-ld.bfd arm-linux-c++.br_real arm-linux-gcc-nm arm-linux-readelf
</code></pre></div></div>
<p>La toolchain de cross-compilation regroupe tous les outils dont les noms sont préfixés par larchitecture (arm), loutil de production (buildroot), le système dexploitation de la cible (linux) et les conventions dinterfaçage binaire entre applications et système (gnueabi). Pour simplifier lappel des outils, des liens symboliques existent raccourcissant le préfixe pour ne garder que larchitecture et le système dexploitation. On invoquera donc arm-linux-gcc ou arm-linux-g++ par exemple.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>board/rpi-3/cross/usr/bin/arm-linux-gcc -v
</code></pre></div></div>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>Utilisation des specs internes.
COLLECT_GCC=/mnt/dplus/br-tree/board/rpi-3/cross/bin/arm-linux-gcc.br_real
COLLECT_LTO_WRAPPER=/mnt/dplus/br-tree/board/rpi-3/cross/bin/../libexec/gcc/arm-buildroot-linux-gnueabihf/7.3.0/lto-wrapper
Cible : arm-buildroot-linux-gnueabihf
Configuré avec: ./configure --prefix=/mnt/dplus/br-tree/buildroot-2018.08/../board/rpi-3/cross --sysconfdir=/mnt/dplus/br-tree/buildroot-2018.08/../board/rpi-3/cross/etc --enable-static --target=arm-buildroot-linux-gnueabihf --with-sysroot=/mnt/dplus/br-tree/buildroot-2018.08/../board/rpi-3/cross/arm-buildroot-linux-gnueabihf/sysroot --disable-__cxa_atexit --with-gnu-ld --disable-libssp --disable-multilib --with-gmp=/mnt/dplus/br-tree/buildroot-2018.08/../board/rpi-3/cross --with-mpc=/mnt/dplus/br-tree/buildroot-2018.08/../board/rpi-3/cross --with-mpfr=/mnt/dplus/br-tree/buildroot-2018.08/../board/rpi-3/cross --with-pkgversion='Buildroot 2018.08' --with-bugurl=http://bugs.buildroot.net/ --disable-libquadmath --enable-tls --disable-libmudflap --enable-threads --without-isl --without-cloog --disable-decimal-float --with-abi=aapcs-linux --with-cpu=cortex-a53 --with-fpu=neon-vfpv4 --with-float=hard --with-mode=arm --enable-languages=c,c++ --with-build-time-tools=/mnt/dplus/br-tree/buildroot-2018.08/../board/rpi-3/cross/arm-buildroot-linux-gnueabihf/bin --enable-shared --disable-libgomp
Modèle de thread: posix
gcc version 7.3.0 (Buildroot 2018.08)
</code></pre></div></div>
<p>Si lon souhaite pouvoir invoquer directement le cross-compiler depuis la ligne de commande sans préciser tout le chemin (par exemple pendant une phase de développement de code métier hors Buildroot), on peut éditer le fichier ~/.bashrc afin dy ajouter à la fin la ligne suivante :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>PATH=$PATH:/home/yannick/media/dplus/br-tree/board/rpi-3/cross/usr/bin/
</code></pre></div></div>
<p>On peut aussi adopter une autre approche qui consiste à créer un script qui modifie dynamiquement le PATH, script que lon sourcera (que lon invoquera en le précédant dun point) avant chaque session de travail sur le code applicatif.</p>
<h3 id="système-complet">Système complet</h3>
<p>Nous allons construire à présent une image dun système complet, y compris le noyau, en utilisant la toolchain obtenue précédemment. Il nous faut effacer les fichiers objets, fichiers temporaires, etc. produits auparavant et lon serait tenté de faire un make clean. Abstenons-nous en néanmoins car cela aurait pour effet deffacer la toolchain compilée. La solution la plus simple pour éviter les erreurs de manipulation est de supprimer le répertoire de compilation de Buildroot et de décompresser à nouveau larchive téléchargée.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cd /home/yannick/media/dplus/br-tree
rm -rf buildroot-2018.08
tar xf buildroot-2018.08.tar.bz2
cd buildroot-2018.08/
</code></pre></div></div>
<p>Puis nous préparons une nouvelle configuration, toujours, en partant de celle par défaut.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>make raspberrypi3_defconfig
make menuconfig
</code></pre></div></div>
<p>Passons en revue les menus pour observer ce quil faut modifier :</p>
<ul>
<li><strong>Target options</strong> : rien à changer</li>
<li><strong>Build options</strong> :
* <strong>Download dir</strong> : configurons le répertoire de téléchargement pour retrouver le précédent. Nouvelle valeur : <strong>$(TOPDIR)/../dl</strong></li>
<li><strong>Toolchain</strong> : plusieurs modifications sont nécessaires pour retrouver la toolchain précédente.
* <strong>Toolchain type</strong> : nous souhaitons que Buildroot considère la toolchain comme préexistante, même si cest lui qui la créée auparavant. Nouvelle valeur : <strong>External toolchain</strong>
* <strong>Toolchain</strong> : elle a été compilée spécifiquement. Nouvelle valeur : <strong>Custom toolchain</strong>
* <strong>Toolchain origin</strong> : il nest pas nécessaire de la télécharger. Valeur conservée : <strong>Pre-installed toolchain</strong>
* <strong>Toolchain path</strong> : le répertoire dans lequel se trouve le sous-répertoire bin de la chaîne de compilation. Nouvelle valeur : <strong>$(TOPDIR)/../board/RPI-3/cross/usr</strong>
* <strong>External toolchain gcc version</strong> : si vous navez pas noté ce numéro de version lors de la configuration de la toolchain, vous pouvez lobtenir en appelant arm-linux-gcc -v comme ci-dessus. Nouvelle valeur : <strong>7.x</strong>
* <strong>External toolchain kernel headers series</strong> : on peut retrouver le numéro de version si on ne la pas noté, mais cest plus compliqué. Il faut regarder le contenu du fichier <em>../board/rpi-3/cross/usr/arm-buildroot-linux-gnueabihf/sysroot/usr/include/linux/version.h</em>. On y trouve une valeur LINUX_VERSION_CODE 266515. Il faut convertir ce nombre en hexadécimal, par exemple en saisissant sur la ligne de commande du shell printf %x\n 266515. Ceci nous affiche 41113 qui représente chiffre par chiffre le numéro de noyau 4.11.13. Ce sont les deux premiers chiffres qui comptent, le troisième nest pas nécessairement le même que celui qui sera effectivement sélectionné pour compiler le système complet. Nouvelle valeur : <strong>4.17.x</strong>
* <strong>External toolchain C library</strong> : en tant que bibliothèque C, nous avons choisi de compiler une GlibC. Nouvelle valeur : <strong>glibc/eglibc</strong>
* <strong>Toolchain has SSP support?</strong> : loption Stack Smashing Protection (qui limite les dégâts en cas de débordement de buffer dans la pile) est active par défaut dans la GCC. Nouvelle valeur : <strong>[<em>]**.
* **Toolchain has RPC support?** : le support pour les Remote Procedure Call est activé dans la chaîne de compilation produite. Nous pouvons lajouter ici. Nouvelle valeur : **[</em>]</strong>.
* <strong>Toolchain has C++ support</strong> : lintégration dun compilateur C++ dans la toolchain était activée par défaut lors de la compilation précédente. Nouvelle valeur : <strong>[*]</strong></li>
<li>System Configuration : rien à changer dans ce menu, mais nous lajusterons un peu plus tard.</li>
<li>Kernel : rien à changer</li>
<li>Target packages : rien à changer</li>
<li>Filesystem images : rien à changer</li>
<li>Bootloaders : rien à changer</li>
<li>Host utilities : rien à changer</li>
<li>Legacy config options : rien à changer</li>
</ul>
<p>À nouveau, sauvegardons notre configuration pour pouvoir la réutiliser directement si besoin et lançons la compilation.</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>cp .config ../board/rpi-3/buildroot-2018.08-system-01.config
make
</code></pre></div></div>
<p>La compilation se termine au bout de quelques minutes avec en haut de la page de message une ligne plutôt surprenante :</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>/usr/bin/install -m 0644 support/misc/target-dir-warning.txt /mnt/dplus/br-tree/buildroot-2018.08/output/target/THIS_IS_NOT_YOUR_ROOT_FILESYSTEM
&gt;&gt;&gt; skeleton-init-sysv Extracting
&gt;&gt;&gt; skeleton-init-sysv Patching
&gt;&gt;&gt; skeleton-init-sysv Configuring
&gt;&gt;&gt; skeleton-init-sysv Building
&gt;&gt;&gt; skeleton-init-sysv Installing to target
rsync -a --ignore-times --exclude .svn --exclude .git --exclude .hg --exclude .bzr --exclude CVS --chmod=u=rwX,go=rX --exclude .empty --exclude '*~' package/skeleton-init-sysv//skeleton/ /mnt/dplus/br-tree/buildroot-2018.08/output/target/
&gt;&gt;&gt; skeleton Extracting
&gt;&gt;&gt; skeleton Patching
&gt;&gt;&gt; skeleton Configuring
&gt;&gt;&gt; skeleton Building
&gt;&gt;&gt; skeleton Installing to target
&gt;&gt;&gt; toolchain-external-custom Extracting
&gt;&gt;&gt; toolchain-external-custom Patching
&gt;&gt;&gt; toolchain-external-custom Configuring
Cannot execute cross-compiler '/mnt/dplus/br-tree/buildroot-2018.08/../board/RPI-3/cross/usr/bin/arm-linux-gcc'
make: *** [package/pkg-generic.mk:222: /mnt/dplus/br-tree/buildroot-2018.08/output/build/toolchain-external-custom/.stamp_configured] Error 1
</code></pre></div></div>
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