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Subject: Re: [ANNOUNCEMENT] Updated: mingw64-*-gcc-5.4.0-1 (x86/x86_64) (Testing)
To: cygwin@cygwin.com
References: <announce.57A51E0B.4080204@gmail.com>
From: Yaakov Selkowitz <yselkowitz@cygwin.com>
Message-ID: <ab53c484-71e5-404d-2b78-3cce330753e8@cygwin.com>
Date: Sun, 7 Aug 2016 18:48:02 -0500
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On 2016-08-05 18:15, JonY wrote:
> I have just updated the mingw-w64 cross compilers Cygwin 32bit and 64bit.
>
> This version is considered testing and has --enable-vtable-verify set.
> I'd consider moving it to stable if it can build non-trivial C++
> applications.

I had no issues compiling a few different projects with this release, 
however enabling this configure flag means that linking C++ with -static 
does not work because libstdc++.a then requires VTV symbols.  Also, note 
that neither Fedora's nor (AFAICS) Debian's native gcc enable this 
feature, so I don't know how much exposure it has received yet.

I would recommend rebuilding a 5.4.0-2 without this configure flag, and 
releasing it as stable.

> ==== PLEASE RECOMPILE ALL YOUR C++ CODE FOR ABI COMPATIBILITY ====

Until this is stable and mingw-based C++ packages have been recompiled, 
-D_GLIBCXX_USE_CXX11_ABI=0 can be used as a workaround.

-- 
Yaakov

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