Why does qmake say nothing about issues that were before adding one line into the .pro file

[sosun]

Qmake told me about some issues with static member and that I need to add -std+=c++11 flag. I added it using CONFIG += c++11 and it worked fine. But then I erased this line (wanted to get these issues back) and got clean build without any issues. Was it "cached" or what?

[JohanSolo]

IIRC the makefiles are not automatically generated when the pro file is changed. You have to explicitely run qmake.

[JKSH]

@JohanSolo said:

IIRC the makefiles are not automatically generated when the pro file is changed. You have to explicitely run qmake.

That's correct.

Or, you can simply delete the build folder.