Include issue for ui.h since qt 5.15.12

lacuna

Hi there,

since I updated to Qt 5.15.12 I get in any of my projects
a strange error message like this type:

Member access into incomplete type 'Ui::MyApp' (fix available)
myapp.h:76:7: forward declaration of 'Ui::MyApp'
Include "build/release/tmp/ui_myApp.h" for symbol Ui::MyApp

I thought Qt Creator and Qt takes care of including ui_*.h files.
Does anybody has an idea how to fix this?

thx in advance

JonB

@lacuna
Make sure you have cleaned and rebuilt to create the ui_myApp.h file when uic is run on myApp.ui file.
Your myApp.cpp should have #include "ui_myApp.h in it.

Include "build/release/tmp/ui_myApp.h" for symbol Ui::MyApp

The file should be generated into, and found in, build/release/ui_myApp.h. I don't know how/why you have a tmp subdirectory in there, and it looks like that is the problem.

lacuna

@JonB

Dear Jon, thx for your valuable response. Let me answer your question about the tmp directory.

We use a different structure for build directories, instead of shadow build structure.
With "tmp" and build it worked fine the last 3 years and was easier to be cleared and maintained.

CONFIG(debug, debug|release) {
        DESTDIR      = $$PWD/build/debug/
    } else {
        DESTDIR      = $$PWD/build/release/
    }

... some more stuff

#Temporary build directory
TMP_DIR      = $$DESTDIR/tmp
OBJECTS_DIR  = $$DESTDIR/tmp
MOC_DIR      = $$DESTDIR/tmp
RCC_DIR      = $$DESTDIR/tmp
UI_DIR       = $$DESTDIR/tmp
``

SGaist

Hi,

Rather than hard coding paths within your sources, you should do out of source builds. This will make things even easier to clean.

lacuna

@SGaist I agree - but my co workers insist in their old way to do things ...

JonB

@lacuna
I suggest you find which directory the ui_...h file is being regenerated into when the uic command is run. Then look at how your code is doing the include and what the include path is. Then work back from there to what is/is not going on, and compare to previous version.