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The "xd..." options disable exception handling.  Consequently, it is not
possible to use throw,  try, or catch statements, or to specify a function
exception specification.  If your program (or a library which it includes)
throws exceptions, then one of the "xs..." options should be used to compile
all the modules in your program; otherwise, any active objects created
within the module will not be destructed during exception processing.

Multiple schemes are possible, allowing experimentation to determine the
optimal scheme for particular circumstances.  You can mix and match schemes
on a module basis, with the proviso that exceptions should be enabled
wherever it is possible that a created object should be destructed by the
exception mechanism.