On 24/7/23 17:01, Cristian Adam wrote:
The compilation time degradation is being tracked at [QTBUG-97601]
Compilation speed decrease with Qt 6.2 compared to Qt 5.15.2 - Qt Bug
Tracker <https://bugreports.qt.io/browse/QTBUG-97601>
For Qt Creator I use https://ccache.dev/ (yes, it works with MSVC) so
that even if it takes longer to compile, I won't be compiling the same
file in same situation twice.
Thanks, good to know this a known issue with work in progress. I do use
ccache on my linux builds, though I'm finding it increasingly unreliable
with PCH enabled so I will have to decide which is more useful.
My test compile results for 5.15.13 versus 6.5.2 are even worse than the
figures you reported in that issue.
For a project with ~600 TUs, compiled on linux with clang 14, PCH on but
no ccache, I see 40 seconds -> 96 seconds.
For another project with ~900 TUs, compiled with MSVC 2022 with jom, PCH
on but no ccache, I see 178 seconds -> 332.
I compile with CONFIG += c++2a on both Qt versions.
Hamish
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