windows - Identifier for win64 configuration in Qmake

Question

Is there a "win64" identifier in Qmake project files? Qt Qmake advanced documentation does not mention other than unix / macx / win32.

So far I've tried using:

win32:message("using win32")
win64:message("using win64")
amd64:message("using amd64")

The result is always "using win32".

Must I use a separate project-file for x32 and x64 projects, so they would compile against correct libraries? Is there any other way to identify between 32-bit and 64-bit environments?

Answer 1

I do it like this

win32 {

    ## Windows common build here

    !contains(QMAKE_TARGET.arch, x86_64) {
        message("x86 build")

        ## Windows x86 (32bit) specific build here

    } else {
        message("x86_64 build")

        ## Windows x64 (64bit) specific build here

    }
}