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Starting with Android 5 there is support to 64-bit ABIs on Android and 2015 is the year the first devices are being produced/sold using this new feature. When will monodroid runtime support 64-bit build?
To support it we will need a distribution containing both 32 and 64-bit versions of the libmonodroid.so native library as well as 32 and 64-bit versions of the libmonosgen-2.0.so library. We would also need to upgrade the native library detection to support the ABI changes.
64-bit runtime support will be provided in Xamarin.Android 5.1.
One complication: the Android NDK r10d for x86_64 is broken, as it contains a 32-bit libm.so for linking. Consequently, if you need to use the NDK *and* reference libm.so *and* support x86_64, you're hosed. Hopefully Google will fix this in a future NDK release.