hostcompiler.pro 194 bytes
option(host_build)
gcc:equals(QT_ARCH, "x86_64"):contains(QT_TARGET_ARCH, "arm"):!contains(QT_TARGET_ARCH, "arm64") {
    QMAKE_CXXFLAGS += -m32
    QMAKE_LFLAGS += -m32
SOURCES = main.cpp