Why is the -undef option removed from cpp.

[H . J . Lu]

The -undef option:

	-undef Do not predefine any nonstandard macros.

is removed from cpp in gcc 2.96. But XFree86 4.0 uses

#define RawCppCmd CppCmd -undef

As the result, many files generated by RawCppCmd are empty. Why is
it removed?

Thanks.


H.J.