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<a href="https://gitlab.com/stweil">Stefan Weil</a>
<a href="https://gitlab.com/gnutls/libtasn1/-/merge_requests/71#note_500136125">commented</a>:
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<p dir="auto">clang may handle the undefined expression (NULL + offset) as NULL. Compile this test program with <code>-O2</code> and run it with and without an argument:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">#include <stdio.h></span>
<span id="LC2" class="line" lang="plaintext"></span>
<span id="LC3" class="line" lang="plaintext">int main(int argc, char *argv[]) {</span>
<span id="LC4" class="line" lang="plaintext"> char *p = argv[1] + argc;</span>
<span id="LC5" class="line" lang="plaintext"> if (p != NULL) {</span>
<span id="LC6" class="line" lang="plaintext"> printf("%p+%d => %p (%c)\n", argv[1], argc, p, *p);</span>
<span id="LC7" class="line" lang="plaintext"> } else {</span>
<span id="LC8" class="line" lang="plaintext"> printf("%p+%d => NULL\n", argv[1], argc);</span>
<span id="LC9" class="line" lang="plaintext"> }</span>
<span id="LC10" class="line" lang="plaintext"> return 0;</span>
<span id="LC11" class="line" lang="plaintext">}</span></code></pre>
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