qt5base-lts/mkspecs/features/device_config.prf

# This file is loaded by some qmakespecs to get early configuration data.

host_build: \
    PRI_FILE_NAME = qhost.pri
else: \
    PRI_FILE_NAME = qdevice.pri
DEVICE_PRI = $$[QT_HOST_DATA/get]/mkspecs/$$PRI_FILE_NAME
exists($$DEVICE_PRI):include($$DEVICE_PRI)
unset(DEVICE_PRI)

# this variable can be persisted via qmake -set CROSS_COMPILE /foo
!host_build:isEmpty(CROSS_COMPILE): CROSS_COMPILE = $$[CROSS_COMPILE]

# Provide a function to be used by mkspecs
defineTest(deviceSanityCheckCompiler) {
    equals(QMAKE_HOST.os, Windows): \
        sfx = .exe
    else: \
        sfx =

    # Build the compiler filename using the first value in QMAKE_CXX in order to
    # support tools like ccache, which give QMAKE_CXX values of the form:
    #     ccache <path_to_compiler>
    compiler = $$first(QMAKE_CXX)$$sfx

    # Check if the binary exists with an absolute path. Do this check
    # before the CROSS_COMPILE empty check below to allow the mkspec
    # to derive the compiler path from other device options.
    exists($$compiler):return()

    # Check for possible reasons of failure
    # check if CROSS_COMPILE device-option is set
    isEmpty(CROSS_COMPILE):error("CROSS_COMPILE needs to be set via -device-option CROSS_COMPILE=<path>")

    # Check if QMAKE_CXX points to an executable.
    ensurePathEnv()
    for (dir, QMAKE_PATH_ENV) {
        exists($$dir/$${compiler}): \
            return()
    }

    # QMAKE_CXX does not point to a compiler.
    error("Compiler $$QMAKE_CXX not found. Check the value of CROSS_COMPILE -device-option")
}