Is there any issue which is blocking this pull request?

It seems like there are much more packages requiring QT6 after update, including all KDE/Kirigami Frameworks packages, lxqt packages and mkvtoolnix. I marked all related auto-updater bot issues with qt6 label.

I am not complaining, but there are already 40 issues with qt6 tag, 37 of them are auto-updater issues. Is there anything I can help with?

Thanks for the testing. I will merge it thus freeing up others to explore building other qt6 packages. Feel free to modify existing qt6 packages if they are blocking building other qt6 packages.

I was building feathernotes and featherpad in package-builder container. qt6-qtbase-cross-tools and qt6-qtsvg-cross-tools were downloaded automatically but those are not mentioned in build depends. Could you explain the reason for that?

Likely because normal building of qt6-qtbase will result in building its subpackage qt6-qtbase-cross-tools too. Others correct me if I am wrong for this.

So in download and extract dependencies mode (build-package.sh -I) will pull the main packages as well as its subpackages.

Generally I don't explicitly fill TERMUX_PKG_BUILD_DEPENDS for cross-tools due to this quirk.

Likely because normal building of qt6-qtbase will result in building its subpackage qt6-qtbase-cross-tools too.

And we need the *-cross-tools subpackage anyway for crosscompiling, right?
Makes perfect sense to automatically pull it in then when specifying qt6-qtbase, etc. as a dependency.

Q. cat $PWD/user_facing_tool_links.txt | xargs -P${TERMUX_MAKE_PROCESSES} -L1 ln -sv is done in qt6-qtbase-cross-tools but not in qt6-qtbase, is that expected?

user_facing_tool_links.txt is empty for qt6-qtbase. Otherwise would have done the same action.