[Bug preprocessor/38105] -Wundef -Werror -Wno-error=undef result in error, not warning

[jsm28 at gcc dot gnu dot org]

------- Comment #4 from jsm28 at gcc dot gnu dot org  2009-03-29 23:04 -------
cpplib now uses diagnostic.c, but this does not magically fix this problem.

See what I said in <http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00491.html>
about how to fix this:

  One potential use for making cpplib use the compiler's diagnostic
  infrastructure would be the ability to control the warnings (with
  pragmas, -Werror=option etc.) the same way as with those from the
  compiler.  To implement this on top of this patch, cpp_error and
  cpp_error_with_line could be changed to take a cpplib-specific
  identifier for the diagnostic or group of diagnostics; the callbacks
  could then convert those identifiers to ones suitable for
  diagnostic.c.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38105