How to configure only what's necessary for a specific module.

[UebelAndre]

If I wanted to only build say, QtQml, but I have the entire qt (5.14) source code, what flags can I pass to the configure script to have nmake only produce what's necessary for QtQml?

I'm also confused as to how I identify what modules produce what libraries. This was particularly confusing with QtGui, I think it's the QtBase module that produces it, but am still not sure. Where can I find this information?

[UebelAndre]

@SGaist Ah ok, so to sum it all up.

• In order to identify what module will build which specific library, you should check the dev branches on https://code.qt.io/ or inspect the source code of the module
• In order to build a specific module, you have to either use the configure/configure.bat scripts and pass -skip for every module except the ones you want. From there running make && make install will build the desired modules
  • Additionally, you could run the configure script with no -skip arguments and run make module-<name> && make module-<name>-install_subtargets to build the desired modules.

Is that correct?

[Christian Ehrlicher]

You can create a module (and it's dependencies) by calling 'make module-<module-name>' (e.g. make module-qtmultimedia)

Where can I find this information?

By looking into the sources.

[UebelAndre]

This post is deleted!

[SGaist]

Hi,

In the dev branch you have the information in the dependencies.yaml file. This one is for the QtDeclarative module.

You have the --skip option to remove modules from the build list.

Otherwise, you can start with only qtbase and then manually build the modules you need.

[UebelAndre]

@Christian-Ehrlicher But QtQml and QtGui aren't modules. Is there no way to figure out what will produce those libraries other than digging through source code?

Also tagging @SGaist

[SGaist]

qtbase provides the essential modules like QtCore, QtGui etc.

Most of the other modules provide the modules matching their name with a couple of exceptions like qtdeclarative which provides QtQML.

[UebelAndre]

@SGaist Interesting, I'm not seeing any dependencies.yaml files in any of the modules in https://github.com/qt/qt5 Is there something that generates those?

[SGaist]

It's in the dev branch.

By the way, github is only a mirror. The code resides at https://code.qt.io

[UebelAndre]

@SGaist Ah ok, so to sum it all up.

• In order to identify what module will build which specific library, you should check the dev branches on https://code.qt.io/ or inspect the source code of the module
• In order to build a specific module, you have to either use the configure/configure.bat scripts and pass -skip for every module except the ones you want. From there running make && make install will build the desired modules
  • Additionally, you could run the configure script with no -skip arguments and run make module-<name> && make module-<name>-install_subtargets to build the desired modules.

Is that correct?

[SGaist]

The information is more clearly available now with the dev branch (which is Qt 6 development).

A third option is to build qtbase first and then the other modules.