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Date: Wed, 7 Oct 2015 09:45:41 +0200
Message-ID: <CAEhDDbCxA9sA8DQzFXAC=8=H9aEHrytf8Ete99MwEdp+1U-uHw@mail.gmail.com>
Subject: Re: Updated: gcc-5.2.0-1 (Test x86/x86_64)
From: Csaba Raduly <rcsaba AT gmail DOT com>
To: cygwin list <cygwin AT cygwin DOT com>
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On Wed, Oct 7, 2015 at 12:12 AM, David Stacey  wrote:
>
> On 06/10/15 18:51, Ken Brown wrote:

(snip)

>>
>>
>> What about the following scenario: Package P links against library L. Library L is rebuilt to use the new ABI.  Isn't it possible that package P will then have to be rebuilt as well?
>
>
> My understanding is that if 'L' is built with -D_GLIBCXX_USE_CXX11_ABI=0 then P wouldn't need to be rebuilt (I haven't tested that, though). However, this compiler switch loses some C++11 features of the STL, so it isn't a magic cure.
>

If you use -D_GLIBCXX_USE_CXX11_ABI=0, you're stuck with the COW (the
old std::string implementation in libstdc++ which uses copy-on-write;
this is not standard-conforming anymore). std::list::size() remains
O(n) instead of the newly mandated O(1).

AFAIK, that's it.

Csaba
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