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Date:      Wed, 21 Apr 2021 14:09:45 +0000
From:      bugzilla-noreply@freebsd.org
To:        standards@FreeBSD.org
Subject:   [Bug 255290] _POSIX_C_SOURCE=200809 hides static_assert
Message-ID:  <bug-255290-99-t4dE8V6WZM@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-255290-99@https.bugs.freebsd.org/bugzilla/>
References:  <bug-255290-99@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D255290

Warner Losh <imp@FreeBSD.org> changed:

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

--- Comment #1 from Warner Losh <imp@FreeBSD.org> ---
(In reply to Tobias Kortkamp from comment #0)
> I've reported this upstream
> but we have found no evidence that POSIX 2008 mandates C99 and
> should hide static_assert.

If POSIX 2008 and/or C99 do not mandate static_assert, it must be hidden for
them. A general rule is that system headers cannot pollute name spaces of t=
he
user when directed to do so by things like POSIX_C_SOURCE.

static_assert was added, I believe, in C11 and C++11. As such, it should be
hidden from the 2008 posix environment.

I've not checked to see if there's a newer value of POSIX_C_SOURCE that sho=
uld
define a higher value of either __POSIX_VISIBLE or __ISO_C_VISIBLE, but sin=
ce
you're using 200809, that's not relevant.

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