-Xa is a Sun WorkShop Compiler C 4.2 option,
     -X[a|c|s|t]
          Specifies the degree of conformance to the ANSI C stan-
          dard.  Specifies one of the following:

          a (ANSI)
               ANSI C plus K&R C compatibility  extensions,  with
               semantic  changes required by ANSI C.  Where K&R C
               and ANSI C specify  different  semantics  for  the
               same  construct,  the compiler will issue warnings
               about the conflict and use the ANSI C  interpreta-
               tion. This is the default compiler mode.
John
[EMAIL PROTECTED]


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