[cfe-dev] TableGen backend to generate .def warning files from .td files

[Ted Kremenek]

Today I added a TableGen backend to generate our current .def warning  
files from TableGen .td files.  This is part of the effort to provide  
fine-grained warning control for Clang.  Moving the warnings over to a  
declarative TableGen format moves us closer to this goal.

Sebastian: Is it possible to regenerate (sync) the warnings .td files  
with the current .def files using the technique you used before?  I'd  
like to test the TableGen backend to make sure that we're generating  
the same set of warning definitions.

After the backend generates equivalent (in functionality) .def files,  
the plan is to remove the .def files from Clang and have them  
automatically created during a build.