qt5base-lts/mkspecs/features/configure.prf

equals(MAKEFILE_GENERATOR, UNIX) {
    QMAKE_MAKE = make
} else:equals(MAKEFILE_GENERATOR, MINGW) {
    !equals(QMAKE_HOST.os, Windows): \
        QMAKE_MAKE = make
    else: \
        QMAKE_MAKE = mingw32-make
} else:if(equals(MAKEFILE_GENERATOR, MSVC.NET)|equals(MAKEFILE_GENERATOR, MSBUILD)) {
    QMAKE_MAKE = nmake
} else:ios {
    # iOS unsets MAKEFILE_GENERATOR in its default_pre.prf
    QMAKE_MAKE = make
} else {
    error("Configure tests are not supported with the $$MAKEFILE_GENERATOR Makefile generator.")
}

# Ensure that a cache is present. If none was found on startup, this will create
# one in the build directory of the project which loads this feature.
cache()

QMAKE_CONFIG_LOG = $$dirname(_QMAKE_CACHE_)/config.log
QMAKE_CONFIG_TESTS_DIR = $$_PRO_FILE_PWD_/config.tests

defineTest(qtRunLoggedCommand) {
    msg = "+ $$1"
    write_file($$QMAKE_CONFIG_LOG, msg, append)
    system("$$1 >> \"$$QMAKE_CONFIG_LOG\" 2>&1")|return(false)
    return(true)
}

# Try to build the test project in $$QMAKE_CONFIG_TESTS_DIR/$$1
# ($$_PRO_FILE_PWD_/config.tests/$$1 by default).
#
# If the test passes, config_$$1 will be added to CONFIG.
# The result is automatically cached. Use of cached results
# can be suppressed by passing CONFIG+=recheck to qmake.
#
# Returns: true iff the test passes
defineTest(qtCompileTest) {
    positive = config_$$1
    done = done_config_$$1

    $$done:!recheck {
        $$positive:return(true)
        return(false)
    }

    log("Checking for $${1}... ")
    msg = "executing config test $$1"
    write_file($$QMAKE_CONFIG_LOG, msg, append)

    test_dir = $$QMAKE_CONFIG_TESTS_DIR/$$1
    test_out_dir = $$shadowed($$test_dir)
    test_cmd_base = "cd $$system_quote($$system_path($$test_out_dir)) &&"

    # Disable qmake features which are typically counterproductive for tests
    qmake_configs = "\"CONFIG -= qt debug_and_release app_bundle lib_bundle\""

    # Clean up after previous run
    exists($$test_out_dir/Makefile):qtRunLoggedCommand("$$test_cmd_base $$QMAKE_MAKE distclean")

    mkpath($$test_out_dir)|error("Aborting.")

    qtRunLoggedCommand("$$test_cmd_base $$system_quote($$system_path($$QMAKE_QMAKE)) $$qmake_configs $$shell_quote($$test_dir)") {
        qtRunLoggedCommand("$$test_cmd_base $$QMAKE_MAKE") {
            log("yes$$escape_expand(\\n)")
            msg = "test $$1 succeeded"
            write_file($$QMAKE_CONFIG_LOG, msg, append)

            !$$positive {
                CONFIG += $$positive
                cache(CONFIG, add, positive)
            }
            !$$done {
                CONFIG += $$done
                cache(CONFIG, add, done)
            }
            export(CONFIG)
            return(true)
        }
    }

    log("no$$escape_expand(\\n)")
    msg = "test $$1 FAILED"
    write_file($$QMAKE_CONFIG_LOG, msg, append)

    $$positive {
        CONFIG -= $$positive
        cache(CONFIG, sub, positive)
    }
    !$$done {
        CONFIG += $$done
        cache(CONFIG, add, done)
    }
    export(CONFIG)
    return(false)
}