Qt 5.9 iOS Release Build unwanted GCC_WARN_64_TO_32_BIT_CONVERSION

Debug Builds are ok

Release Builds gives me thousands of warnings (see attached screenshot)

In Xcode I can manually disable the warnings, but next time Qt is building a release they're back

thx jakepetroules I found a way to suppress these warnings:

ios {
...
    disable_warning.name = GCC_WARN_64_TO_32_BIT_CONVERSION
    disable_warning.value = NO
    QMAKE_MAC_XCODE_SETTINGS += disable_warning
...
}

 under 5.8 / Xcode 8.2 I never had this problem