Oticon is using a compiler different from those in the SDK.
Front-end is clang, but everything else is proprietary.
Problems we are facing:
* C99 issues (mostly solved now)
* Cmake being hardcoded for GNU (we have patches that we want to PR - but they have to be cleaned up)
* Linker. (Not compatible with GNU LD, and more feature constrained).
* Unaligned access, big-endian.