C++ Driver does not compile with Mingw.
Tested versions of Mingw are 3.4.5 which comes with Qt 4.5 and 4.6.

mongo/client/../util/goodies.h: In member function `mongo::WrappingInt
mongo::WrappingInt::atomicIncrement()':
mongo/client/../util/goodies.h:131: error: invalid conversion from
`volatile long int*' to `long int*'

mongo/client/../util/goodies.h:131: error: initializing argument 1
of `long int InterlockedIncrement(long int*)'
mongo/client/../util/goodies.h: In function `void
mongo::time_t_to_String(time_t, char*)':
mongo/client/../util/goodies.h:172: error: `ctime_s' was not declared
in this scope

mongo/client/../util/goodies.h:172: warning: unused variable 'ctime_s'
In file included from mongo/client/dbclient.h:22,

mongo/client/../db/jsobj.h: In constructor `mongo::JSObj1::JSObj1()':
mongo/client/../db/jsobj.h:1631: error: `strcpy_s' was not declared in
this scope