https://move.cyber-neurones.org/tags/gcc/ Recent content in Gcc on Blog GoHugo de Fredô : Linux, Proxmox, IA, Trail, Course, Randonnée, Gravel, Ski de Randonnée Hugo fr Mon, 05 Sep 2022 00:00:00 +0000 https://move.cyber-neurones.org/post/2022/09/2022-09-05-ubuntu-22-04-1-gcc-11-fcommon-issue-multiple-definition-of/ Mon, 05 Sep 2022 00:00:00 +0000 https://move.cyber-neurones.org/post/2022/09/2022-09-05-ubuntu-22-04-1-gcc-11-fcommon-issue-multiple-definition-of/ <p>Avec GCC 11 on a changer la valeur par défaut.</p> <ul> <li>GCC 11 : -fno-common (Release note : <a href="https://gcc.gnu.org/gcc-11/changes.html">https://gcc.gnu.org/gcc-11/changes.html</a> )</li> <li>GCC 10 : -fcommon</li> </ul> <p>Donc pour supprimer les problèmes (de facon rapide) il suffit d&rsquo;ajouter la directive -fcommon. La solution idéale est de revoir le code &hellip; et surtout les .h.</p> <p>Misère.</p> <p>Pour information Ubuntu <strong>22.04.1</strong> utilise gcc <strong>11.2.0-19</strong> .</p> <p>La doc : <a href="https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html">https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html</a></p> <blockquote> <p><strong>-fcommon</strong></p> <p>In C code, this option controls the placement of global variables defined without an initializer, known as <em>tentative definitions</em> in the C standard. Tentative definitions are distinct from declarations of a variable with the <code>extern</code> keyword, which do not allocate storage.</p>