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If you look at the changes, you'll see most things are pretty simple:

* CMake files are expanded to handle an Android target.

* Code that checks for specific defines or values like __FREEBSD__ || __LINUX__ now have an added condition to also check for __ANDROID__.

* Some tooling scripts to integrate adb into the Swift SDK.

* Some minor fixes elsewhere.

So, special support is a really minimal set of changes that any platform would need.

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In addition to the Bionic short-comings already mentioned here, there appears to be other work to deal with the fact that things must be cross-compiled in a way that you can build a compiler for your host machine, but generate Android binaries (and for each architecture).

Also, there are also a bunch of support things for libICU which is not an official component on Android we are allowed.

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