I read though HERE, yet I still don't understand the syntax of the qmake CONFIG variable. for example, if I have the following CONFIG settings in my .pro file:

CONFIG(debug, debug|release) {
    message("debug mode")
}else {
    message("release mode")
}

then, when running qmake, the following will be displayed in the Compile Output in Qt-Creator:

Project MESSAGE: debug mode
Project MESSAGE: debug mode
Project MESSAGE: release mode

knowing that I am building my project in a "debug mode", then my questions are:

  • why not showing the "debug mode" message only ? and why not showing it just once ?
  • Then, since I am building in a "debug mode", why the message "Project MESSAGE: release mode" is displayed ?
  • Exactly, what the syntax: CONFIG(debug, debug|release) really means? does it means that build in a debug mode, then again build in a debug mode and lastly build in a release mode ? I know that these brackets "{}" means a scope (old link was died, recommend scope) but how qmake interpret what is inside these brackets "()" ?
qt qt-creator qmake
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