https://bugs.kde.org/show_bug.cgi?id=416008
Bug ID: 416008
Summary: feature request: prepare kwin for unity build
Product: kwin
Version: 5.17.5
Platform: Chakra
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: a....@web.de
Target Milestone: ---
salve
'single unit compilation' or 'unity build' or 'jumbo build' are a technique to
reduce build time.
how does unity build work, please read the explanation from the meson build
system, this explanation is imo comfortable to read because its short and exact
enough https://mesonbuild.com/Unity-builds.html
a propos meson build system, cmake 3.16 also support unity build
https://cmake.org/cmake/help/v3.16/prop_tgt/UNITY_BUILD.html
as example how fast unity builds can be i compiled kactivities 5.65 with cmake:
#with set `-DCMAKE_UNITY_BUILD=TRUE`
real 66,03 - 68,91 - 68,93
user 92,77 - 98,05 - 68,93
sys 8,80 - 8,76 - 8,95```
#as normal build
real 128,53 - 125,27 - 129,16
user 219,17 - 215,70 - 219,40
sys 15,54 - 15,68 - 16,41
unfortunately i wasn't able to build kwin as unity build it breaks with error:
In file included from /usr/include/qt5/QtCore/qobject.h:54,
from /usr/include/qt5/QtWidgets/qwidget.h:45,
from /usr/include/qt5/QtWidgets/qdialog.h:44,
from /usr/include/qt5/QtWidgets/QDialog:1,
from
/tmp/makepkg/kwin/src/kwin-5.17.5/kcmkwin/kwinrules/detectwidget.h:23,
from
/tmp/makepkg/kwin/src/build/kcmkwin/kwinrules/kdeinit_kwin_rules_dialog_autogen/EWIEGA46WW/moc_detectwidget.cpp:10,
from
/tmp/makepkg/kwin/src/build/kcmkwin/kwinrules/kdeinit_kwin_rules_dialog_autogen/mocs_compilation.cpp:2,
from
/tmp/makepkg/kwin/src/build/kcmkwin/kwinrules/CMakeFiles/kdeinit_kwin_rules_dialog.dir/Unity/unity_0.cxx:3:
/tmp/makepkg/kwin/src/kwin-5.17.5/kcmkwin/kwinrules/ruleswidget.cpp:42:1:
Fehler: Redefinition von »struct QMetaTypeId<NET::WindowType>«
Q_DECLARE_METATYPE(NET::WindowType)
^~~~~~~~~~~~~~~~~~
/tmp/makepkg/kwin/src/kwin-5.17.5/kcmkwin/kwinrules/main.cpp:35:1: Anmerkung:
vorherige Definition von »struct QMetaTypeId<NET::WindowType>«
Q_DECLARE_METATYPE(NET::WindowType)
^~~~~~~~~~~~~~~~~~
In file included from /usr/include/qt5/QtCore/qobject.h:54,
from /usr/include/qt5/QtCore/QObject:1,
from
/usr/include/KDecoration2/kdecoration2/decorationbutton.h:26,
from
/usr/include/KDecoration2/KDecoration2/DecorationButton:1,
from
/tmp/makepkg/kwin/src/kwin-5.17.5/kcmkwin/kwindecoration/declarative-plugin/buttonsmodel.h:23,
from
/tmp/makepkg/kwin/src/build/kcmkwin/kwindecoration/kcm_kwindecoration_autogen/IEE35O66SJ/moc_buttonsmodel.cpp:10,
from
/tmp/makepkg/kwin/src/build/kcmkwin/kwindecoration/kcm_kwindecoration_autogen/mocs_compilation.cpp:2,
from
/tmp/makepkg/kwin/src/build/kcmkwin/kwindecoration/CMakeFiles/kcm_kwindecoration.dir/Unity/unity_0.cxx:3:
/tmp/makepkg/kwin/src/kwin-5.17.5/kcmkwin/kwindecoration/kcm.cpp:42:1: Fehler:
Redefinition von »struct QMetaTypeId<KDecoration2::BorderSize>«
Q_DECLARE_METATYPE(KDecoration2::BorderSize)
^~~~~~~~~~~~~~~~~~
/usr/include/KDecoration2/kdecoration2/decorationsettings.h:147:1: Anmerkung:
vorherige Definition von »struct QMetaTypeId<KDecoration2::BorderSize>«
Q_DECLARE_METATYPE(KDecoration2::BorderSize)
^~~~~~~~~~~~~~~~~~
/tmp/makepkg/kwin/src/kwin-5.17.5/kcmkwin/kwinrules/detectwidget.cpp:39:1:
Fehler: Redefinition von »struct QMetaTypeId<NET::WindowType>«
Q_DECLARE_METATYPE(NET::WindowType)
^~~~~~~~~~~~~~~~~~
/tmp/makepkg/kwin/src/kwin-5.17.5/kcmkwin/kwinrules/main.cpp:35:1: Anmerkung:
vorherige Definition von »struct QMetaTypeId<NET::WindowType>«
Q_DECLARE_METATYPE(NET::WindowType)
^~~~~~~~~~~~~~~~~~
make[2]: ***
[kcmkwin/kwindecoration/CMakeFiles/kcm_kwindecoration.dir/build.make:63:
kcmkwin/kwindecoration/CMakeFiles/kcm_kwindecoration.dir/Unity/unity_0.cxx.o]
Fehler 1
make[1]: *** [CMakeFiles/Makefile2:4821:
kcmkwin/kwindecoration/CMakeFiles/kcm_kwindecoration.dir/all] Fehler 2
make[1]: *** Es wird auf noch nicht beendete Prozesse gewartet....
make[2]: ***
[kcmkwin/kwinrules/CMakeFiles/kdeinit_kwin_rules_dialog.dir/build.make:104:
kcmkwin/kwinrules/CMakeFiles/kdeinit_kwin_rules_dialog.dir/Unity/unity_0.cxx.o]
Fehler 1
make[1]: *** [CMakeFiles/Makefile2:4956:
kcmkwin/kwinrules/CMakeFiles/kdeinit_kwin_rules_dialog.dir/all] Fehler 2
[ 35%] Built target kdecorationprivatedeclarative
make: *** [Makefile:130: all] Fehler 2
unfortunately again it will need some time to debug and review the code but the
expected saved time is tremendous
sincerely tom
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