[Qbs] Multiple "favored" binaries from one product

[Jake Petroules]

> On May 4, 2017, at 9:05 AM, Christian Kandeler <Christian.Kandeler at qt.io> wrote:
> 
> On 05/04/2017 04:19 PM, Thomas Ballenthin wrote:
>> I'm currently building my unit tests each as individual CppApplication. This works fine as it is. But now I'm facing the problem to build each unit test twice with different compiler options per set.
> 
> Let me make sure I understand the use case correctly: You build your
> project only once, but selected products shuld exist more than once,
> with varying build properties?
> 
>> As I understand, each product outputs a single file. What is the most convenient way to produce two binaries with different compiler switches from the same source files? 
> 
> At the moment, the only way to really multiplex on the product level is
> using (external) profiles. See the "profiles" entry in
> https://doc.qt.io/qbs/product-item.html. As far as I can tell, this
> would more or less map to the "flavor" thing if the profile contents
> could be specified in-place, correct?

The new multiplexing we are working on could also serve this use case well...

> 
>> I would like to reduce code duplication and not specify several CppApplications per unit test. Is there a way to have a "product factory", or rules that process groups of files and output binaries.
> 
> A less general way that might be sufficient for your needs would be to
> move most of the product specification into a base item and instantiate
> it twice:
> // In TestX.qbs
> CppApplication {
>    // Depends { // ... }
>    // files: [ ... ]
>    // etc
> }
> 
> // In your project file
> Project {
>    TestX {
>        name: "testx1"
>        cpp.defines: ["VARIANT1"]
>    }
>    TestX {
>        name: "testx2"
>        cpp.defines: ["VARIANT2"]
>    }
> }
> 
> 
> 
> Hope this helps,
> Christian
> 
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-- 
Jake Petroules - jake.petroules at qt.io
The Qt Company - Silicon Valley
Qbs build tool evangelist - qbs.io