qmake Project file has both "debug" and "release" conditions true

[norobro]

From the Qt docs

Scopes are similar to if statements in procedural programming languages. If a certain condition is true, the declarations inside the scope are processed.

So your scope says that if the OS is win32 compile with debug and release libraries.

Try something like this:

CONFIG += debug
 
win32 {
    CONFIG(debug) { 
        LIBS += -L../trialLibA/debug
        PRE_TARGETDEPS += ../trialLibA/debug/libtrialLibA.a
     } else {
        LIBS += -L../trialLibA/release
        PRE_TARGETDEPS += ../trialLibA/release/libtrialLibA.a
     }
}

CONFIG += debug

win32 {
    CONFIG(debug) { 
        LIBS += -L../trialLibA/debug
        PRE_TARGETDEPS += ../trialLibA/debug/libtrialLibA.a
     } else {
        LIBS += -L../trialLibA/release
        PRE_TARGETDEPS += ../trialLibA/release/libtrialLibA.a
     }
}

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