File too big error qt6.6.1 mingw64

[AraSaWCH]

H:/QTinstall/Tools/mingw1120_64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/as.exe: qmlexport/CMakeFiles/qskqmlexport.dir/QskQml.cpp.obj: too many sections (32785)
C:\Users\SF7381.ABO\AppData\Local\Temp\ccbeDjsK.s: Assembler messages:
C:\Users\SF7381.ABO\AppData\Local\Temp\ccbeDjsK.s: Fatal error: can't write 27 bytes to section .text of qmlexport/CMakeFiles/qskqmlexport.dir/QskQml.cpp.obj: 'file too big'
H:/QTinstall/Tools/mingw1120_64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/as.exe: qmlexport/CMakeFiles/qskqmlexport.dir/QskQml.cpp.obj: too many sections (32785)
C:\Users\SF738~1.ABO\AppData\Local\Temp\ccbeDjsK.s: Fatal error: qmlexport/CMakeFiles/qskqmlexport.dir/QskQml.cpp.obj: file too big
[254/480 0.8/sec] Building CXX object support/CMakeFiles/qsktestsupport.dir/qrc_fonts.cpp.obj
ninja: build stopped: subcommand failed.
14:53:57: The process "H:\QTinstall\Tools\CMake_64\bin\cmake.exe" exited with code 1.
Error while building/deploying project QSkinny (kit: Desktop Qt 6.6.1 MinGW 64-bit)
When executing step "Build"
14:53:57: Elapsed time: 05:10.

How to fix this error??

[uwerat]

@rick-vogel: any clue: ( as you are the only windows user )

[vrcomputing]

@AraSaWCH did you try adding -Wa,-mbig-obj to the qskqmlexport CMake target's compiler flags? I'm not experienced with mingw, these are just a guesses.

C:\Users\SF7381.ABO\AppData\Local\Temp\ccbeDjsK.s: Fatal error: can't write 27 bytes to section .text of qmlexport/CMakeFiles/qskqmlexport.dir/QskQml.cpp.obj: 'file too big'

I once had a similiar output with MSVC and had to pass it MSVC's /bigobj what makes me think -mbig-obj might be right for mingw

Found these after 5s of google, maybe they help:

• https://stackoverflow.com/questions/31890021/mingw-too-many-sections-bug-while-compiling-huge-header-file-in-qt
• https://stackoverflow.com/questions/16596876/gcc-equivalent-of-mss-bigobj

[vrcomputing]

PS: Unfortunately I was not able to reproduce it locally with: Qt 6.6.1, Qt 6.6.1 MinGW 64-bit Kit from the Qt Maintenance Tool, Win11 Host, 64 GB RAM

[vrcomputing]

PPS: @uwerat @AraSaWCH I noticed the [254/480 0.8/sec] Building CXX object support/CMakeFiles/qsktestsupport.dir/qrc_fonts.cpp.obj ninja: build stopped: subcommand failed. line and saw that the qrc_fonts.cpp.obj has 14 MiBi.

Don't know if this is related but there is a BIG_RESOURCES keyword in the qt_add_resources woth giving it a try.

Note that BIG_RESOURCES is not compatible with iOS due to restrictions of CMake's Xcode project generator. See QTBUG-103497 for details. Also, BIG_RESOURCES only works reliably from CMake 3.17 onwards.

[vrcomputing]

PPPS: I can reproduce the error when building Debug instead of Release

[uwerat]

The main reason for the object size is related to exporting lists to QML. The culprit is QMetaType::fromType< QList >( ) that creates tons of symbols for all the types, that are Q_GADGET. As we do not register any of these lists to the metaobject system I simply disabled exporting them. That reduces the size on my box ( Linux/gcc ) by ~66%.

I also removed unused SegoeUI fonts ( emojis, symbols ... ) and split the fonts into different resource files for SegoeUI/Roboto/DejaVu. The largest of them ( SegoeUI ) ends up as binary with 6359496 bytes.

@AraSaWCH please let us know if this solves the issue