Re: Qt build problems after bump to 5.12.7

[Tobias Geerinckx-Rice <me@tobias.gr>]

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John Soo 写道：
> I was looking into the failing freecad build and I found the 
> following
> bug from the qt 5.12.7 known bugs page
> (https://wiki.qt.io/Qt_5.12.7_Known_Issues).
>
> - Qt-based CMake projects might fail if their build directories 
> contain dots:
>
>   https://bugreports.qt.io/browse/QTBUG-81715
>
> I think this probably effects more cmake based qt projects than 
> just freecad.
> The qt-build-system is based on cmake and many of the store 
> paths and
> build paths include semver version numbers.
>
> What should we do?

IIUC that this only affects qtbased packages:

1. If more than 300 qtbase dependents currently build fine: apply 
the fix[0] to a separate qtbase/fixed package, and use it (on 
master) in all packages that currently fail to build because of 
this bug.  Once Qt 5.12.8 comes out in April (or we upgrade 
everything to 5.14), the /fixed variant can be removed on the 
staging branch.

2. If fewer than 300 qtbase dependents currently build 
successfully: apply the patch directly to qtbase on master.  Newly 
succeeding builds don't count as rebuilds.

Does that make sense?

Kind regards,

T G-R

[0]: https://codereview.qt-project.org/c/qt/qtbase/+/288359

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