[Bug 271808] -D_POSIX_C_SOURCE=200809L shadows visibility of M_PI from math.h

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 19 Jun 2023 06:26:22 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271808

Konstantin Belousov <kib@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib@FreeBSD.org

--- Comment #1 from Konstantin Belousov <kib@FreeBSD.org> ---
It fails the same way on glibc 2.37.  M_PI etc seems to be required only by
late POSIX standards, e.g. IEEE Std 1003.1™-2017.  I did not tried to look
for the earliest reference.

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