[Interest] Compile Qt 6.2.1 from source

[joao morgado]

> My rule of thumb: 2 GB of RAM per logical processor to do a compilation. So 16 
> GB of RAM is sufficient for a 4-core system (8 CPUs), but not for 6-core (12 > CPUs).
> But this doesn't apply to qtwebengine. That thing has a few VERY big files > that are concatenation of a lot of small ones and take multiple GB of RAM to > compile. If you don't need qtwebengine, don't download it and don't build it.> sdfs
Thanks for this info. 

I have another question, I sucessfully build the dev branch, then I tried to build the branch 6.2.0 in another directory, using the same build parameters, but it failled with the following messages.
Any ideias why this error happened ?Thanks
[ 20%] Running AUTOMOC file extraction for target Scxml
Consolidate compiler generated dependencies of target repc
[ 20%] Running AUTOMOC file extraction for target Sensors
[ 20%] Built target SerialPort_automoc_json_extraction
Updating '/home/joao/qt6.2.0/qt5/qt6.2.0-build/qtbase/./translations/linguist_en.qm'...
Updating '/home/joao/qt6.2.0/qt5/qt6.2.0-build/qtbase/./translations/qtwebsockets_en.qm'...
lrelease error: cannot create '/home/joao/qt6.2.0/qt5/qt6.2.0-build/qtbase/./translations/linguist_en.qm': No such file or directory
lrelease error: cannot create '/home/joao/qt6.2.0/qt5/qt6.2.0-build/qtbase/./translations/qtwebsockets_en.qm': No such file or directory
make[2]: *** [qttranslations/translations/CMakeFiles/updateqm-linguist_en.ts.dir/build.make:70: qttranslations/translations/CMakeFiles/updateqm-linguist_en.ts] Erro 1
make[2]: *** [qttranslations/translations/CMakeFiles/updateqm-qtwebsockets_en.ts.dir/build.make:70: qttranslations/translations/CMakeFiles/updateqm-qtwebsockets_en.ts] Erro 1
make[1]: *** [CMakeFiles/Makefile2:259792: qttranslations/translations/CMakeFiles/updateqm-linguist_en.ts.dir/all] Erro 2
make[1]: *** A aguardar por trabalhos não terminados....
make[1]: *** [CMakeFiles/Makefile2:244804: qttranslations/translations/CMakeFiles/updateqm-qtwebsockets_en.ts.dir/all] Erro 2
[ 20%] Built target repc
Updating '/home/joao/qt6.2.0/qt5/qt6.2.0-build/qtbase/./translations/qtwebengine_en.qm'...
lrelease error: cannot create '/home/joao/qt6.2.0/qt5/qt6.2.0-build/qtbase/./translations/qtwebengine_en.qm': No such file or directory
make[2]: *** [qttranslations/translations/CMakeFiles/updateqm-qtwebengine_en.ts.dir/build.make:70: qttranslations/translations/CMakeFiles/updateqm-qtwebengine_en.ts] Erro 1
make[1]: *** [CMakeFiles/Makefile2:244830: qttranslations/translations/CMakeFiles/updateqm-qtwebengine_en.ts.dir/all] Erro 2
[ 20%] Built target Scxml_automoc_json_extraction
[ 20%] Built target Positioning_automoc_json_extraction
[ 20%] Built target Sensors_automoc_json_extraction
[ 20%] Built target DesignerComponentsPrivate_automoc_json_extraction
make: *** [Makefile:146: all] Erro 2
joao at joao-Lenovo-Legion-Y530-15ICH:~/qt6.2.0/qt5/qt6.2.0-build$ git branch
* 6.2.0
  dev
joao at joao-Lenovo-Legion-Y530-15ICH:~/qt6.2.0/qt5/qt6.2.0-build$ 



    Em sábado, 2 de outubro de 2021 02:11:38 GMT+1, Thiago Macieira <thiago.macieira at intel.com> escreveu:  
 
 On Friday, 1 October 2021 08:52:09 PDT joao morgado via Interest wrote:
> cmake --build . -j 6
> and it works very well, much less memory used and the pc was usable during
> compile time

My rule of thumb: 2 GB of RAM per logical processor to do a compilation. So 16 
GB of RAM is sufficient for a 4-core system (8 CPUs), but not for 6-core (12 
CPUs).

But this doesn't apply to qtwebengine. That thing has a few VERY big files 
that are concatenation of a lot of small ones and take multiple GB of RAM to 
compile. If you don't need qtwebengine, don't download it and don't build it.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel DPG Cloud Engineering



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