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If ACE_USES_WCHAR is defined in config.h, the TAO_IDL_FE library is not compileable under windows. There are lots of compile errors, all caused by invalid mixing of char and wchar_t.
this is a known problem, see bug 399 and bug 1874. For the core libs the schedule is to address this for TAO 1.5.2 *** This bug has been marked as a duplicate of 399 ***