[Bug libstdc++/93421] futex.cc use of futex syscall is not time64-compatible

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93421

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 49267
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49267&action=edit
Proposed fix

Rich, does this work for musl?

As glibc hasn't updated its userspace timespec yet I have no way to test
whether this fixes the problem, because I don't have the problem.

Is inspecting __USE_TIME_BITS64 allowed with musl? The current proposal at 
https://sourceware.org/glibc/wiki/Y2038ProofnessDesign#API_design says users
can check if that's defined, although usually the __USE_xxx macros are not
meant for public consumption.