RE: switching "project contexts"

[Drew Adams]

> apologies if this is an old topic and I have missed previous  
> solutions. We are using Emacs to work on a number of C++ 
> projects and are looking for a way to switch between
> "project contexts": similar to using VisualStudio, SunStudio
> or XCode project files, we would like to  
> have a mechanism that sets up project-specific settings for etags,  
> macros etc. There is probably a good way to do this with one ".el"  
> file per project. I can imagine that this problem has been 
> tackled by many developers with more Emacs experience than we have.

This is not a complete solution to what you request, but it might help in
working with projects:
http://www.emacswiki.org/cgi-bin/wiki/Icicles_-_Support_for_Projects

And I'm sure other people will be able to help with code that more specifically
does what you want.

Good luck, and consider posting what you come up with to Emacs Wiki to share it
with others: http://www.emacswiki.org/. That's also an additional place to ask
for help.