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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/105021] New: [11/12 Regression] Missing freestanding
 headers: bits/atomic_base.h:41:10: fatal error: bits/atomic_wait.h: No such
 file or directory
Date: Tue, 22 Mar 2022 17:50:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105021

            Bug ID: 105021
           Summary: [11/12 Regression] Missing freestanding headers:
                    bits/atomic_base.h:41:10: fatal error:
                    bits/atomic_wait.h: No such file or directory
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

With -std=3Dc++20 a simple #include <atomic> fails for a freestanding libra=
ry:


In file included from /tmp/freestanding/include/c++/12.0.1/atomic:41,
                 from /tmp/freestanding/include/c++/12.0.1/bits/stdc++.h:4,
                 from <stdin>:1:
/tmp/freestanding/include/c++/12.0.1/bits/atomic_base.h:41:10: fatal error:
bits/atomic_wait.h: No such file or directory
   41 | #include <bits/atomic_wait.h>
      |          ^~~~~~~~~~~~~~~~~~~~
compilation terminated.


That header also needs <bits/functional_hash.h> and <bits/gthr.h> which are=
 not
freestanding either.=