Updated: gcc-5.2.0-1 (Test x86/x86_64)
Csaba Raduly
rcsaba@gmail.com
Wed Oct 7 07:45:00 GMT 2015
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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