Disable API prior to 6.2 - no go

Anonymous_Banned275

QPromise was added in 6.2 , my kit is set to 6.2.2 and QPromise is not valid.

Per note in .pro
I enabled this DEFINES and still cannot use QPromise.

Is my "number " 0x060200 correct ?
Am I missing something else ?

#QPromise
# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060200    # disables all the APIs deprecated before Qt 6.2.0

sierdzio

Is my "number " 0x060200 correct ?

Yes.

I enabled this DEFINES and still cannot use QPromise.

As a new API it is unrelated to "deprecated before" stuff.

From documentation it seems all you need for it to work is QT+=core which is there by default. Strange, it should work! What error message are you getting?

mchinand

Post the errors you are getting and post your .pro file. Also, if you're using QtCreator, post a screenshot of the 'Projects' page.

Anonymous_Banned275

What difference does it makes what error I am getting?
Is the title of post enough "description"?

Can anybody answer my " is the number " correct question ?

Now you can see same
error" I am getting . Hope it helps.

Anonymous_Banned275

I have build an independent t, not part of my main project, project and selected kit 6.2.2.
It still fails to find QPromise.
I am going to load another 6.2 and see if that is the problem .
Stand by.

mchinand

@sierdzio already answered that question and correctly stated that setting that variable is unrelated to your problem since you are not working with a deprecated class or function. You either have an error in your .pro file, you're using the wrong kit, and/or didn't start with a clean (empty) build folder. Share your .pro file and a screenshot of your 'Projects' page from QtCreator. And the full compile output.

Anonymous_Banned275

I have found that mixing versions in "subproject" is a bad thing.
But it can be done - so I am back to RTFM
Until then I cannot honestly say this has been solved.

PS I wonder if I can add the 6.2.2 version subproject as a complied library - after all that is how it is going to be a part of "subdirs" project anyway - as a library. .

Christian Ehrlicher

You must not mix Qt libraries with different version. Especially you must not mix Qt5 and Qt6.