On 2022-01-03 08:43, Marc Mutz wrote:
Hi,
The Qt Creator folks have noted that compilation of Qt projects
against Qt 6.2 is sometimes almost twice as slow as it was in 5.15:
https://bugreports.qt.io/browse/QTBUG-97601
While we have some ideas where this may come from (including more std
headers, qmetatype compile-time typename construction, qglobal.h
becoming larger and larger), most of these should be fixed by PCH, yet
PCH builds are also slower.
The questions that we face now are a) do we care and b) if we do, then
what metrics should we use to define success?
Hi Marc,
Better first check what the problem is.
You can use "clang -ftime-trace" [1] or Microsoft's own thing [2]
Both were easy to use and helped for customer project's build times.
[1]
https://aras-p.info/blog/2019/01/16/time-trace-timeline-flame-chart-profiler-for-Clang/
[2] https://devblogs.microsoft.com/cppblog/introducing-c-build-insights/
Regards,
--
Sérgio Martins | [email protected] | Senior Software Engineer
Klarälvdalens Datakonsult AB, a KDAB Group company
Tel: Sweden (HQ) +46-563-540090, USA +1-866-777-KDAB(5322)
KDAB - The Qt, C++ and OpenGL Experts
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