[Interest] passing something into subdirs qmake

[Vyacheslav Lanovets]

Hello,

I want to invent some convenient way to switch between two variations
of the same app. Current approach is to have 2 pro files with subdirs
inside.
The selected config is passed into subdirs like this:

product_var="MYAPP1=true"
write_file(".qmake.conf", product_var)

This is not reliable and confuses Qt Creator. Is there any other way
to pass something from pro files into subdirs dependencies?

Regards,
Vyacheslav