There is a bug in clang versions before 3.2 (including the one shipped with Xcode) that makes it give a "conflicting types" compile error when there is a static constexpr function defined outside the class. The way to work around this is either to remove one of the "static" or "constexpr" keywords, or to simply put the definition inline.
See: https://stackoverflow.com/a/17494592/2135754
I would try and upgrade Xcode to version 5 to see if the problem is fixed, but the buildbot still runs OS X Lion (10.7) and the last version of Xcode that works on Lion is 4.6.3, so it seems easier to just apply these workarounds for now.
* Better support for typedefs
* Same code should compile for both 32-bit and 64-bit
* C++11 typed enum support
* Synthesize __setitem__ when operator [] returns reference
* Rewrite coerce system to have better performance
* Change semantics of __getattr__ and __setattr__ to match
Python's, add __getattribute__, __delattr__ and __delitem__
* Improve performance of slot functions a bit more
* Reduce memory overhead of type system
* Some support for wrapping arrays of numeric types
* C++11 character type support in cppparser
* Chars are handled as strings of length 1
* Template functions for CreatePyInstance that use runtime type map
* More functions from dtool as extension functions
* Code cleanup
Sam Edwards
rdb
tobspr
David Rose
Zachary Pavlov