Errors occur when Building Qt5.15.2 from sources

[gaojinhsu]

I just get stuck while trying to build Qt from sources on Ubuntu18.04. any solution? I checked their official doc , and I don't think I miss any step.

../configure -developer-build -opensource -nomake examples -nomake tests -prefix /home/mike/Qt/5.15.2/gcc_64/ -webengine-proprietary-codecs -platform linux-clang

ninja: build stopped: subcommand failed.
Makefile.gn_run:1331: recipe for target 'run_ninja' failed
make[4]: *** [run_ninja] Error 1
make[4]: Leaving directory '/home/mike/Qt/5.15.2/Src/build/qtwebengine/src/core'
Makefile:82: recipe for target 'sub-gn_run-pro-make_first' failed
make[3]: *** [sub-gn_run-pro-make_first] Error 2
make[3]: Leaving directory '/home/mike/Qt/5.15.2/Src/build/qtwebengine/src/core'
Makefile:79: recipe for target 'sub-core-make_first' failed
make[2]: *** [sub-core-make_first] Error 2
make[2]: Leaving directory '/home/mike/Qt/5.15.2/Src/build/qtwebengine/src'
Makefile:48: recipe for target 'sub-src-make_first' failed
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory '/home/mike/Qt/5.15.2/Src/build/qtwebengine'
Makefile:1087: recipe for target 'module-qtwebengine-make_first' failed
make: *** [module-qtwebengine-make_first] Error 2

[gaojinhsu]

It turns out that16GB RAM is not enough for building QtWebEngine. I just enlarge RAM up to 32GB, and everything works fine . Thanks everybody.

[JKSH]

@gaojinhsu said in Errors occur when Building Qt5.15.2 from sources:

trying to build Qt from sources on Ubuntu12.04

Qt 5.15 supports Ubuntu 18.04 and newer: https://doc.qt.io/qt-5/supported-platforms.html

[gaojinhsu]

@JKSH sorry, it's a typo, my ubuntu is 18.04

[kkoehne]

Can you show us the actual error? It must be output before the first line you showed ...

[jsulm]

@gaojinhsu You should post the actual error which is above what you posted from the build log.

[gaojinhsu]

@jsulm @kkoehne

clang++: error: unable to execute command: Killed
clang++: error: clang frontend command failed due to signal (use -v to see invocation)

Above what I post I can only find these by searching "error".

[JonB]

@gaojinhsu
Well it would be nice to be able to see what caused unable to execute command: Killed, can you really not discover that?

[gaojinhsu]

This post is deleted!

[gaojinhsu]

@JonB I googled for a while ,they say That's usually an indication that your virtual machine has run out of RAM. but there is a bug in Parallel, which is resizing disk space and ram doesn't work properly for ubuntu18.04. I'll try it on a real PC later and let you know the result.

[gaojinhsu]

It turns out that16GB RAM is not enough for building QtWebEngine. I just enlarge RAM up to 32GB, and everything works fine . Thanks everybody.