According to [this list on 
Wikipedia](https://en.wikipedia.org/wiki/Source-to-source_compiler#Programming_language_implementations),
 languages / compilers that produce intermediate C code include: C++, BaCon 
(BASIC), Stalin (Scheme), BCX, Chapel, OpenCOBOL, Eiffel, java2c, Lisaac, Vala, 
HipHop (PHP), Nuitka / ShedSkin (Python), X10, Haxe, and Nim.

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