Testsuite warnings about wchar_t

[Billinghurst, David (CALCRTS)]

I have just enabled testing of the -o32 ABI on my irix6.5 testsuite runs
See http://gcc.gnu.org/ml/gcc-testresults/2004-02/msg01329.html
for an example.

Most of the libstdc++ testsuite failures are due to the absence of 
wchar support in the -o32 ABI.  Is there a way to disable of XFAIL 
these tests for only one of the three ABI under test?