https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19165
--- Comment #21 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
One other issue is that column numbering is rather a mess right now. From my
rich-location patch:
/* Both gcc and emacs number source *lines* starting at 1, but
they have differing conventions for *columns*.
GCC uses a 1-based convention for source columns,
whereas Emacs's M-x column-number-mode uses a 0-based convention.
For example, an error in the initial, left-hand
column of source line 3 is reported by GCC as:
some-file.c:3:1: error: ...etc...
On navigating to the location of that error in Emacs
(e.g. via "next-error"),
the locus is reported in the Mode Line
(assuming M-x column-number-mode) as:
some-file.c 10% (3, 0)
i.e. "3:1:" in GCC corresponds to "(3, 0)" in Emacs. */
Our "column numbers" are also simply a byte-count, I believe, so a tab
character is treated by us as simply an increment of 1 right now.
I guess this is a separate issue though.
