On Tue, Jan 8, 2013 at 10:35 PM, Matthew Knepley <knepley at gmail.com> wrote:
> Look at the grammar from the back of K&R. It requires TYPE tokens when you > have definitions. However, > the lexer will produce an ID token unless you look it up in a table. So > this is feedback from the 'typedef' > to the lexer. > You're referring to http://en.wikipedia.org/wiki/The_lexer_hack > So we at least need feedback to the lexer from the parse. I know we need > feedback from cpp > to the lexer. I will think of it. > No, CPP runs completely before anything else is done; there is no "feedback". This is also a debugging feature, e.g., you send a preprocessed source file when reporting a compiler bug so that the compiler devs don't have to reproduce your environment. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20130109/3cff004e/attachment-0001.html>
