https://ov4.org/tags/gdb/ Recent content in GDB on _ov4 Press Hugo en Mon, 14 Sep 2026 18:32:41 +0800 https://ov4.org/posts/2026-09-14/gdb-cxx-catch/ Mon, 14 Sep 2026 18:32:41 +0800 https://ov4.org/posts/2026-09-14/gdb-cxx-catch/ <h2 id="intro">intro</h2> <pre tabindex="0"><code>terminate called after throwing an instance of &#39;std::logic_error&#39; what(): basic_string: construction from null is not valid [1] 441709 IOT instruction build/ccshell </code></pre><p>It&rsquo;s so annoying that you don&rsquo;t have any information regarding what&rsquo;s wrong</p> <p>It&rsquo;s usually a bad idea to binary search by adding print statements because it&rsquo;s slow (log time), but gdb is instant</p> <h2 id="compile-options">compile options</h2> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-sh" data-lang="sh"><span class="line"><span class="cl">-O0 <span class="nv">OPTFLAGS</span> <span class="o">+=</span> -ggdb3 -fno-omit-frame-pointer -fno-inline -D_GLIBCXX_ASSERTIONS </span></span></code></pre></div><h2 id="gdb">gdb</h2> <p>First run the program</p> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-sh" data-lang="sh"><span class="line"><span class="cl">$ gdb --args build/ccshell </span></span><span class="line"><span class="cl">gdb&gt; catch throw </span></span><span class="line"><span class="cl">gdb&gt; run </span></span></code></pre></div><p>When the program stops, check the status</p>