Some impressive code-completion features have been implemented as part of GCCSense, providing accurate editor-agnostic code completion. http://cx4a.org/software/gccsense/ This required some GCC modifications, and thus requires a customized compiler. It would be very useful if these modifications were merged upstream, or could at least be implemented as a plugin. Repository here: http://cx4a.org/repo/gcc.git
Nice! But to get anything merged to GCC you need first a copyright assignment. Otherwise, we cannot even look at your code. http://gcc.gnu.org/contribute.html#legal For implementing this as a plugin, you do not need anything from the GCC project (do you?). So there is no need to open a PR.
Thanks, I have notified the author.
There is nothing we can do on this side except what we have already suggested; that is contact the writer of the code modification to change them/submit them.