On 10/28/20 7:29 AM, Jonathan Wakely wrote:
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.
> I can help you with diagnosing required ABI transitions and package
> rebuilds.
I'd rather just be able to change things freely during stage 1 :-)
The only thing on the table in the immediate term is to start dropping
gcc snapshots into rawhide after stage1 development closes -- ie mid
Nov. So it shouldn't impact your desire to be able to break things
during gcc stage1 :-)
While I think we should seriously consider even earlier drops, that
would be in the gcc-12/F36 timeframe and would require a distinct change
proposal and I think it would be significantly more controversial.
Jeff