Current nightly build redefines assert in assert_util.h:

#ifdef assert
#undef assert
#endif

#define MONGO_assert(Expression) (void)( (!!(_Expression)) || (mongo::asserted(#_Expression, __FILE, __LINE_), 0) )
#define assert MONGO_assert

This may break compilation because the redefinition doesn't always behave like e.g. the gcc linux implementation. asert_util.h is included thorugh dbclient.h etc., so the redefinition affects client applications. I had to change the include order to get back the normal assert behaviour.