error: Variable QMAKE_CXX.COMPILER_MACROS is not defined.

[luoluo]

When I open a completed project and run it in QT5.12, there are three problems :

and these error originate from the following picture:

Does anyone have any idea about this problem?

[jsulm]

@luoluo What exact Qt version do you use?

[luoluo]

@jsulm 5.12.12

[jsulm]

@luoluo MinGW? MSVC?
What does "completed project" mean?
Did you do a complete rebuild (delete build folder, run qmake, build)?