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Subject:	Re: Weird mismatch between cdefs and stdatomic
From:	LRN <lrn1986 AT gmail DOT com>
To:	cygwin AT cygwin DOT com
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Message-ID:	<3da40be0-c91a-27c3-ac41-8195e63e5e9c@gmail.com>
Date:	Wed, 30 Jan 2019 10:15:54 +0300
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From: LRN <lrn1986 AT gmail DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <3da40be0-c91a-27c3-ac41-8195e63e5e9c AT gmail DOT com>
Subject: Re: Weird mismatch between cdefs and stdatomic


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On 28.01.2019 17:02, LRN wrote:
> This[0] and this[1]. One header checks for atomic C/CXX extensions *and* =
for
> the presence of a C++ compiler, while the other only checks for extension=
s.
>=20
> The result is that the _Atomic() macro is *not* defined in cdefs.h when
> compiled with C++, but the stdatomic.h atomic macros assume that it is, a=
nd try
> to access the "__val" struct member, with predictable and sad results.
>=20
> I just stumbled upon this while compiling OpenSSL, and wanted to see if a=
nyone
> else encountered this problem.
>=20

There is also a "!defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L"
condition in cdefs.h that is not reproduced in stdatomic.h. So my initial g=
uess
seems to have been incorrect - it's not about C vs C++ compiler, it's about=
 C11
vs C99 compiler modes.


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