qt6.qtbase: move qmodule.pri to $dev too

[doronbehar]

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[K900]

What does this actually achieve?

[doronbehar]

What does this actually achieve?

It avoids having qt6.qtbase.out depend on pkg-config, and makes only qt6.qtbase.dev depend on pkg-config. In a cross compilation context, the dependency of qt6.qtbase.out on pkg-config is very expensive, as the latter pulls build platform Bash and more.

[K900]

Does it break qmake?

[doronbehar]

Does it break qmake?

qt6.qmake is only a setup hook mostly based upon qt6.qtbase, and qt6.qtbase builds fine with this PR (merged upon branch master), and I also verified that:

nix why-depends --all --precise -f. pkgsCross.armv7l-hf-multiplatform.{qt6.qtbase,buildPackages.pkg-config.out}

Shows there is no dependence.

[K900]

qmake the build tool is what consumes these .pri files, and it likely needs to be patched to look in $dev.

[doronbehar]

Well TBH I think the situation is more complex then I though - after skimming over:

• qt6: support cross compilation #447041
• qt5: cross compile with a clean separation of build and host binaries #267311

So I think I will close this, as I also tried to build pkgsCross.armv7l-hf-multiplatform.dsda-launcher and it failed to build due to related errors...

[eryngion]

it likely needs to be patched to look in $dev

It looks into QMAKEPATH that we collect in qtbase-setup-hook.sh. For qtbase itself it could maybe work as-is but for all other modules qmakePathHook has to be in envHostTargetHooks to work properly. Also in qt5 all .pri files go to $dev by virtue of hooks/move-qt-dev-tools.sh.