isEmpty(QMAKE_MAC_SDK): \
    error("QMAKE_MAC_SDK must be set when using CONFIG += sdk.")

contains(QMAKE_MAC_SDK, .*/.*): \
    error("QMAKE_MAC_SDK can only contain short-form SDK names (eg. macosx, iphoneos)")

defineReplace(xcodeSDKInfo) {
    info = $$1
    sdk = $$2
    isEmpty(sdk): \
        sdk = $$QMAKE_MAC_SDK

    isEmpty(QMAKE_MAC_SDK.$${sdk}.$${info}) {
        QMAKE_MAC_SDK.$${sdk}.$${info} = $$system("/usr/bin/xcodebuild -sdk $$sdk -version $$info 2>/dev/null")
        isEmpty(QMAKE_MAC_SDK.$${sdk}.$${info}): error("Could not resolve SDK $$info for \'$$sdk\'")
        cache(QMAKE_MAC_SDK.$${sdk}.$${info}, set stash, QMAKE_MAC_SDK.$${sdk}.$${info})
    }

    return($$eval(QMAKE_MAC_SDK.$${sdk}.$${info}))
}

QMAKE_MAC_SDK_PATH = $$xcodeSDKInfo(Path)
QMAKE_MAC_SDK_PLATFORM_PATH = $$xcodeSDKInfo(PlatformPath)
QMAKE_MAC_SDK_VERSION = $$xcodeSDKInfo(SDKVersion)

sysrootified =
for(val, QMAKE_INCDIR_OPENGL): sysrootified += $${QMAKE_MAC_SDK_PATH}$$val
QMAKE_INCDIR_OPENGL = $$sysrootified

QMAKESPEC_NAME = $$basename(QMAKESPEC)

# Resolve SDK version of various tools
for(tool, $$list(QMAKE_CC QMAKE_CXX QMAKE_FIX_RPATH QMAKE_AR QMAKE_RANLIB QMAKE_LINK QMAKE_LINK_SHLIB QMAKE_ACTOOL)) {
    tool_variable = QMAKE_MAC_SDK.$${QMAKESPEC_NAME}.$${QMAKE_MAC_SDK}.$${tool}
    !isEmpty($$tool_variable) {
        $$tool = $$eval($$tool_variable)
        next()
    }

    value = $$eval($$tool)
    isEmpty(value): next()

    sysrooted = $$system("/usr/bin/xcrun -sdk $$QMAKE_MAC_SDK -find $$first(value) 2>/dev/null")
    isEmpty(sysrooted): next()

    $$tool = $$sysrooted $$member(value, 1, -1)
    cache($$tool_variable, set stash, $$tool)
}

!equals(MAKEFILE_GENERATOR, XCODE) {
    uikit:!host_build {
        ios: deployment_target = $$QMAKE_IOS_DEPLOYMENT_TARGET
        tvos: deployment_target = $$QMAKE_TVOS_DEPLOYMENT_TARGET
        watchos: deployment_target = $$QMAKE_WATCHOS_DEPLOYMENT_TARGET

        device|!simulator: device_archs = $$QMAKE_APPLE_DEVICE_ARCHS
        simulator: simulator_archs = $$QMAKE_APPLE_SIMULATOR_ARCHS
        archs = $$device_archs $$simulator_archs

        isEmpty(archs): \
            error("QMAKE_APPLE_DEVICE_ARCHS or QMAKE_APPLE_SIMULATOR_ARCHS must contain at least one architecture")

        QMAKE_XARCH_CFLAGS =
        QMAKE_XARCH_LFLAGS =
        QMAKE_EXTRA_VARIABLES += QMAKE_XARCH_CFLAGS QMAKE_XARCH_LFLAGS

        single_arch {
            device_archs = $$first(device_archs)
            simulator_archs = $$first(simulator_archs)
            archs = $$first(archs)
        }

        for(arch, archs) {
            contains(simulator_archs, $$arch) {
                sdk = $$simulator.sdk
                version_identifier = $$simulator.deployment_identifier
            } else {
                sdk = $$device.sdk
                version_identifier = $$device.deployment_identifier
            }

            version_min_flags = \
                -Xarch_$${arch} \
                -m$${version_identifier}-version-min=$$deployment_target
            QMAKE_XARCH_CFLAGS_$${arch} = $$version_min_flags \
                -Xarch_$${arch} \
                -isysroot$$xcodeSDKInfo(Path, $$sdk)
            QMAKE_XARCH_LFLAGS_$${arch} = $$version_min_flags \
                -Xarch_$${arch} \
                -Wl,-syslibroot,$$xcodeSDKInfo(Path, $$sdk)

            QMAKE_XARCH_CFLAGS += $(EXPORT_QMAKE_XARCH_CFLAGS_$${arch})
            QMAKE_XARCH_LFLAGS += $(EXPORT_QMAKE_XARCH_CFLAGS_$${arch})

            QMAKE_EXTRA_VARIABLES += \
                QMAKE_XARCH_CFLAGS_$${arch} \
                QMAKE_XARCH_LFLAGS_$${arch}
        }

        QMAKE_CFLAGS_USE_PRECOMPILE =
        for(arch, archs) {
            QMAKE_CFLAGS_USE_PRECOMPILE += \
                -Xarch_$${arch} \
                -include${QMAKE_PCH_OUTPUT_$${arch}}
        }
        QMAKE_CXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE
        QMAKE_OBJCFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE
        QMAKE_OBJCXXFLAGS_USE_PRECOMPILE = $$QMAKE_CFLAGS_USE_PRECOMPILE

        QMAKE_PCH_OUTPUT_EXT = _${QMAKE_PCH_ARCH}$${QMAKE_PCH_OUTPUT_EXT}
    } else: osx {
        version_identifier = macosx
        deployment_target = $$QMAKE_MACOSX_DEPLOYMENT_TARGET
        version_min_flag = -m$${version_identifier}-version-min=$$deployment_target
        QMAKE_CFLAGS += -isysroot $$QMAKE_MAC_SDK_PATH $$version_min_flag
        QMAKE_CXXFLAGS += -isysroot $$QMAKE_MAC_SDK_PATH $$version_min_flag
        QMAKE_LFLAGS += -Wl,-syslibroot,$$QMAKE_MAC_SDK_PATH $$version_min_flag
    }

    QMAKE_CFLAGS += $(EXPORT_QMAKE_XARCH_CFLAGS)
    QMAKE_CXXFLAGS += $(EXPORT_QMAKE_XARCH_CFLAGS)
    QMAKE_LFLAGS += $(EXPORT_QMAKE_XARCH_LFLAGS)
}