[Bug preprocessor/49973] Column numbers count special characters as multiple columns

[tromey at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49973

Tom Tromey <tromey at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |tromey at gcc dot gnu.org
          Component|c++                         |preprocessor

--- Comment #9 from Tom Tromey <tromey at gcc dot gnu.org> 2011-12-07 17:59:52 UTC ---
(In reply to comment #6)
> The GCS says "column numbers should start from 1 at the beginning of the 
> line ... Calculate column numbers assuming that space and all ASCII 
> printing characters have equal width, and assuming tab stops every 8 
> columns.".  This doesn't say how other characters should be counted, 
> although for the results of wcswidth seem appropriate.

Note that GCC also handles the tab case incorrectly here.
This shows up if you M-x next-error in Emacs in the case where
gcc emits column numbers and your source code includes tabs.\

Refiling this to preprocessor.