Diving into GCC Internals
If anyone wants to make an easy but useful improvement to GCC, might I suggest: <a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58770" rel="nofollow">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58770</a><p>Summary: headers that use pragma once are tracked using a list resulting in slow uniqueness checks. The performance fix is to use a hash table.