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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1228#note_317552481">configure.ac</a>:
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="plaintext">dnl We use its presence to detect C11 threads</span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="plaintext">AC_CHECK_HEADERS([threads.h])</span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="plaintext">AC_CHECK_HEADERS([valgrind/memcheck.h])</span>
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<p dir="auto">I would rather enable it unconditionally, given the cost is negligible:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true" style="background-color: #fff; font-family: monospace; font-size: 90%; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0;"><code><span id="LC1" class="line" lang="plaintext">18:59 >ueno< thanks; is there any performance penalty if I unconditionally instrument a program with VALGRIND_MAKE_MEM_UNDEFINED</span>
<span id="LC2" class="line" lang="plaintext">18:59 >ueno< like https://gitlab.com/gnutls/gnutls/-/merge_requests/1228/diffs</span>
<span id="LC3" class="line" lang="plaintext">19:00 =mjw= Nothing is zero cost, but it is really minimal.</span>
<span id="LC4" class="line" lang="plaintext">19:01 =mjw= It inserts some instructions that are basically NOPs, but that valgrind recognizes as a valgrind client request</span>
<span id="LC5" class="line" lang="plaintext">19:03 =mjw= If you want to make it even less overhead you can use if ((flags & GNUTLS_CLIENT) && RUNNING_ON_VALGRIND)</span></code></pre>
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