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| author | Marc Mutz <marc.mutz@qt.io> | 2022-01-18 17:38:48 +0100 |
|---|---|---|
| committer | Marc Mutz <marc.mutz@qt.io> | 2022-01-21 11:22:35 +0000 |
| commit | f29566c5a41c127eacaf13f3dbfe4624e55bc83f (patch) | |
| tree | 65af6e3512b5f3cad8f9839dad98d284e1620a5c /doc/global | |
| parent | 4440387b85bbed53f4b118b8098cc616b4e6c92a (diff) | |
Prevent repeated instantiations of some qRegisterNormalizedMetaType<>s [1/N] (QtGui)
Create macros that wrap the magic developed in
7d63efc16f65f98c657caa90e0d7e9b72a879ade and apply it to all
Q_DECLARE_METATYPE invocations that show up in Clang -ftime-trace for
a PCH'ed QtGui build.
Effects on compile times:
Clang 10 -ftme-trace:
$ ClangBuildAnalyzer --analyze qtgui-before.trace | head -n6
Analyzing build trace from 'qtgui-before.trace'...
**** Time summary:
Compilation (523 times):
Parsing (frontend): 628.3 s
Codegen & opts (backend): 304.5 s
$ ClangBuildAnalyzer --analyze qtgui-after.trace | head -n6
Analyzing build trace from 'qtgui-after.trace'...
**** Time summary:
Compilation (523 times):
Parsing (frontend): 546.0 s
Codegen & opts (backend): 304.4 s
GCC 11 time (bash builtin):
before:
$ time for ((i=0; i < 3; ++i)) do touch src/gui/painting/qpolygon.h ; ninja libQt6Gui.so; done
real 4m13,539s
user 49m24,416s
sys 3m18,177s
after:
$ time for ((i=0; i < 3; ++i)) do touch src/gui/painting/qpolygon.h ; ninja libQt6Gui.so; done
real 3m55,697s
user 45m19,941s
sys 3m7,370s
Task-number: QTBUG-97601
Pick-to: 6.3
Change-Id: Ia8e37a58937568a7ed21cfeb4b27274deca4d53b
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Diffstat (limited to 'doc/global')
| -rw-r--r-- | doc/global/qt-cpp-defines.qdocconf | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/global/qt-cpp-defines.qdocconf b/doc/global/qt-cpp-defines.qdocconf index c2a6ed5448..0a49b37a02 100644 --- a/doc/global/qt-cpp-defines.qdocconf +++ b/doc/global/qt-cpp-defines.qdocconf @@ -177,6 +177,8 @@ Cpp.ignoredirectives += \ Q_CLASSINFO \ Q_DECLARE_INTERFACE \ Q_DECLARE_METATYPE \ + QT_DECL_METATYPE_EXTERN \ + QT_IMPL_METATYPE_EXTERN \ Q_DECLARE_OPERATORS_FOR_FLAGS \ Q_DECLARE_PRIVATE \ Q_DECLARE_PRIVATE_D \ |