detect debug/release in .pro file: message is only correct 2 out of the 3 messages?

Cedric-air

I want to do create a .pro file with 3 different situations:
Linux
Windows debug
Windows release

Therefore I made this .pro file:

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11
CONFIG += qwt

win32: {
    INCLUDEPATH += C:\Qwt-6.2.0\include
    CONFIG(debug, debug|release) {
        message("Windows debug build")
        LIBS += -LC:\Qwt-6.2.0\lib\ -lqwtd
    }

    CONFIG(release, debug|release) {
        message("Windows release build")
        LIBS += -LC:\Qwt-6.2.0\lib\ -lqwt
    }
}

unix: {
    message("Linux build")
    LIBS += -lqwt
}

Then i set the build to debug in the lower-left corner of qt creator, and choose build-run qmake. Then I see this compile output:

09:05:54: Running steps for project testbench-maxicontroller-cont...
09:05:54: Starting: "C:\Qt\5.15.2\mingw81_64\bin\qmake.exe" C:\Users\cedric\Documents\git-werkmap\Maxicontrol_PIC18\testbench\testbench-maxicontroller-cont.pro -spec win32-g++ "CONFIG+=debug" "CONFIG+=qml_debug"
Project MESSAGE: Windows debug build
Project MESSAGE: Windows debug build
Project MESSAGE: Windows release build
09:05:55: The process "C:\Qt\5.15.2\mingw81_64\bin\qmake.exe" exited normally.
09:05:55: Starting: "C:\Qt\Tools\mingw810_64\bin\mingw32-make.exe" -f C:/Users/cedric/Documents/git-werkmap/Maxicontrol_PIC18/build-testbench-maxicontroller-cont-Desktop_Qt_5_15_2_MinGW_64_bit-Debug/Makefile qmake_all
mingw32-make: Nothing to be done for 'qmake_all'.
09:05:55: The process "C:\Qt\Tools\mingw810_64\bin\mingw32-make.exe" exited normally.
09:05:55: Elapsed time: 00:02.

Next I set the build to release in the lower-left corner of qt creator, and choose build-run qmake. Then I see this compile output:

09:07:35: Running steps for project testbench-maxicontroller-cont...
09:07:35: Starting: "C:\Qt\5.15.2\mingw81_64\bin\qmake.exe" C:\Users\cedric\Documents\git-werkmap\Maxicontrol_PIC18\testbench\testbench-maxicontroller-cont.pro -spec win32-g++ "CONFIG+=qtquickcompiler"
Info: creating stash file C:\Users\cedric\Documents\git-werkmap\Maxicontrol_PIC18\build-testbench-maxicontroller-cont-Desktop_Qt_5_15_2_MinGW_64_bit-Release\.qmake.stash
Project MESSAGE: Windows release build
Project MESSAGE: Windows release build
Project MESSAGE: Windows debug build
09:07:37: The process "C:\Qt\5.15.2\mingw81_64\bin\qmake.exe" exited normally.
09:07:37: Starting: "C:\Qt\Tools\mingw810_64\bin\mingw32-make.exe" -f C:/Users/cedric/Documents/git-werkmap/Maxicontrol_PIC18/build-testbench-maxicontroller-cont-Desktop_Qt_5_15_2_MinGW_64_bit-Release/Makefile qmake_all
mingw32-make: Nothing to be done for 'qmake_all'.
09:07:37: The process "C:\Qt\Tools\mingw810_64\bin\mingw32-make.exe" exited normally.
09:07:37: Elapsed time: 00:02.

Why is the message generated 3 times?
Why is the last message incorrect?
My versions:

qwt 6.20
qt 5.15.2
mingw810_64
qt creator 10.0.2
Windows 10.0.19044 build 19044

kkoehne

Does https://wiki.qt.io/Technical_FAQ#What_does_the_syntax_CONFIG.28debug.2Cdebug.7Crelease.29_mean_.3F_What_does_the_1st_argument_specify_and_similarly_what_is_the_2nd_.3F answer your question?

Cedric-air

@kkoehne Thank you. It tells me qmake runs 3 times to generate the configuration for different situations (debug,release and debug and release), and therefore it gives me three times the messages.

I didn't expect qmake to run 3 times.