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:

Answer 1

Since Qt5 you can use QT_ARCH to detect whether your configuration is 32 or 64. When the target is 32-bit, that returns i386 and in case of a 64-bit target it has the value of x86_64. So it can be used like:

contains(QT_ARCH, i386) {
    message("32-bit")
} else {
    message("64-bit")
}