Reproduction steps:
1. Open the attached project.
2. Make sure Scripting Backend is set to IL2CPP.
3. Build and run the project with iOS/Android platform.
- Build hangs while building to device.

Reproduced with:
5.3.8f1, 5.6.0b11, 2017.1.0a3
iOS, Android
IL2CPP

Not reproducible with:
Mono2x

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Response from Dev team:

This is due to the large array initializer of strings expanding to a very large method body without any branches. The array initialization looks like a constant operation in C#, but it really gets expanded in IL to a bunch of string allocations and stores into the array.

This aggravates C/C++ compiler, especially in release, as it tries to optimize this. We will look at better handling this issue, but not likely in the near future.

As a workaround, you can load the string data from an eternal file or encode it as a stream of bytes. You can then read the data into an array yourself and avoid the time/memory expended by the C++ compiler.