argv minus one<p>It's been a while since I ran a build with <a href="https://mastodon.sdf.org/tags/autoconf" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>autoconf</span></a> / <a href="https://mastodon.sdf.org/tags/autotools" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>autotools</span></a>. I had forgotten just how many different little things it checks for.</p><p>One of the main things it's checking for is whether certain headers and functions exist. That reminds me: <a href="https://mastodon.sdf.org/tags/Rust" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Rust</span></a> `cfg` directives really ought to allow a predicate of “such-and-such function/type/whatever exists”. Then you can, for example, call a libc function that exists only on platforms that have it, with fallback on platforms that don't.</p>