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List:       fedora-devel-list
Subject:    Re: [ELN] gcc is going to be updated to gcc11 in the ELN buildroot ahead of Rawhide
From:       Jonathan Wakely <jwakely () fedoraproject ! org>
Date:       2020-10-28 15:00:51
Message-ID: 20201028150051.GV503596 () redhat ! com
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On 28/10/20 14:35 +0100, Florian Weimer wrote:
>* Jonathan Wakely:
>
>> On 28/10/20 13:31 +0100, Florian Weimer wrote:
>>>* Jonathan Wakely:
>>>
>>>> Dropping GCC 11 into rawhide now would mean I can't make certain
>>>> ABI-breaking changes to the C++20 library in upstream GCC, because it
>>>> would be landing on real users' machines. Which means I lose several
>>>> weeks of GCC's stage 1 development. No thanks.
>>>
>>>This is for C++20 library support only, right?
>>
>> Right.
>>
>>>Not much software in Fedora uses the C++ standard library (even at older
>>>C++ versions), so impact on Fedora itself should be limited.
>>
>> On Fedora iteself, yes. But not necessarily on users compiling their
>> own code (or other third-party libraries) using the system compiler.
>
>Does GCC 10 have a stable ABI for C++20 features?  It's still
>experimental.  So I think it's a wash for rawhide users after all?

Yes, that's true. But at least there's a "flag day" when GCC 11
arrives in rawhide, when it's pretty reasonable to expect things to
change.

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