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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug preprocessor/108101] "#pragma once" causes other files not be
 included
Date: Wed, 14 Dec 2022 13:17:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108101

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Iirc pragma once uses a hash of the content and that is what is going on he=
re.
That or the underlying file system is using some inode being the same and c=
opy
on write.=