[plugins] include conventions

[Emmanuel Fleury]

Basile STARYNKEVITCH wrote:
> 
> In other words, how can somebody compile a plugin for GCC on a system
> without GCC build directory?

Only if you do not use any of the GCC internal data-structures...
which seems to narrow a lot the interest of GCC plugins. :)

Short answer would be: No.

Regartds
-- 
Emmanuel Fleury

Weekends don't count unless you spend them doing
something completely pointless.
  -- Calvin & Hobbes (Bill Waterson)