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From: LRN <lrn1986 AT gmail DOT com>
Subject: Weird mismatch between cdefs and stdatomic
To: cygwin AT cygwin DOT com
Message-ID: <41073a89-b446-8051-faab-badef20bddfc@gmail.com>
Date: Mon, 28 Jan 2019 17:02:17 +0300
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From: LRN <lrn1986 AT gmail DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <41073a89-b446-8051-faab-badef20bddfc AT gmail DOT com>
Subject: Weird mismatch between cdefs and stdatomic


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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 extensions.

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, and=
 try
to access the "__val" struct member, with predictable and sad results.

I just stumbled upon this while compiling OpenSSL, and wanted to see if any=
one
else encountered this problem.

[0]
https://sourceware.org/git/gitweb.cgi?p=3Dnewlib-cygwin.git;a=3Dblob;f=3Dne=
wlib/libc/include/stdatomic.h;h=3D09c0cf73e0036537f54c6f5b86d854d1e77795b3;=
hb=3DHEAD#l36
[1]
https://sourceware.org/git/gitweb.cgi?p=3Dnewlib-cygwin.git;a=3Dblob;f=3Dne=
wlib/libc/include/sys/cdefs.h;h=3Dccb47ea4045d025b2ccd2319720879c5f37b3c0f;=
hb=3DHEAD#l290


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