qt5base-lts/mkspecs/features/configure_base.prf

equals(QMAKE_HOST.os, Windows) {
    SETENV_PFX = "set "
    SETENV_SFX = "&"
} else {
    SETENV_PFX =
    SETENV_SFX =
}

QMAKE_MAKE = $$(MAKE)
!isEmpty(QMAKE_MAKE) {
    # We were called recursively. Use the same make.
} else: if(equals(MAKEFILE_GENERATOR, UNIX)|equals(MAKEFILE_GENERATOR, MINGW)) {
    !equals(QMAKE_HOST.os, Windows): \
        QMAKE_MAKE = make
    else: \
        QMAKE_MAKE = mingw32-make
} else: if(equals(MAKEFILE_GENERATOR, MSVC.NET)|equals(MAKEFILE_GENERATOR, MSBUILD)) {
    QMAKE_MAKE = nmake
} else {
    error("Configure tests are not supported with the $$MAKEFILE_GENERATOR Makefile generator.")
}
QMAKE_MAKE_NAME = $$basename(QMAKE_MAKE)
# Make sure we don't inherit MAKEFLAGS - -i in particular is fatal.
QMAKE_MAKE = "$${SETENV_PFX}MAKEFLAGS=$$SETENV_SFX $$QMAKE_MAKE"

defineTest(qtLog) {
    write_file($$QMAKE_CONFIG_LOG, 1, append)
    $$QMAKE_CONFIG_VERBOSE: for (l, 1): log("$$l$$escape_expand(\\n)")
}

defineTest(qtRunLoggedCommand) {
    qtLog("+ $$1")

    !equals(3, false): \
        1 = "( $$1 ) 2>&1"
    output = $$system("$$1", lines, result)
    lg =
    for (l, output): \
        lg += "> $$l"
    qtLog($$lg)
    !isEmpty(2) {
        $$2 = $$output
        export($$2)
    }

    !equals(result, 0): return(false)
    return(true)
}