[Qbs] Accessing properties from a parent project

[Jochen Becher]

I was able to create a small (not necessary minimal) example. Please
see the attached zip file.

It is much more complex than my original minimal code. The main aspect
seems to me a change in qbs 3.0.0:

SubProject { filePath: "MyApp.qbs" }

seems to set parent differently than in the past. If I insert the
content of MyApps.qbs which is a fairly simple CppApplication product
then it works. The module "mymodule" also seems to be important to see
the issue.

Regards, Jochen



Am Donnerstag, dem 10.07.2025 um 13:16 +0200 schrieb Richard Weickelt:
> Hi,
> 
>  > readonly property stringList onEmbedded: parent.onEmbedded
> 
>  > Project {
>  > 	property bool mySetting: true
>  >
>  > 	Project {
>  > 		property bool mySettings: parent.mySetting
>  >                     ? parent.mySetting : false
>  > 	}
>  > }
> 
> This looks problematic. Qbs flattens nested and merges referenced
> project 
> items during the evaluation process (see 
> https://doc.qt.io/qbs/special-property-values.html#project). The 
> documentation does not say it, but that's what Qbs does with project
> items 
> under the hood AFAIK. If you define properties with the same name
> shadowing 
> each other and you use parent in addition, you may observe unwanted
> side 
> effects of the project merger. Maybe you get different results in
> different 
> projects because the property is evaluated at different times during
> the 
> resolve proces. For instance during early project evaluation, during
> probe 
> resolving or during module loading in products.
> 
> I was under the impression that the special "parent" alias is only a
> relict 
> from the QML parser and not guaranteed to work in Qbs. The same
> applies to 
> "id". It's reserved for probes at the moment although it works in
> other 
> cases too.
> 
> Could you live with a different solution? This would work:
> 
> Project {
>      property bool mySetting: true
>      Project {
>          property bool myOtherSetting: project.mySetting
>              ? project.mySetting : false
>      }
> }
> 
> Or if you explain what you want to achieve, we may find a different
> solution?
> 
> Richard
> 
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