On Fri, 17 Apr 2015, Manuel López-Ibáñez wrote: > On 17/04/15 16:42, Tom Tromey wrote: > > > > > > > "Dave" == David Malcolm <dmalc...@redhat.com> writes: > > > > Dave> However within libcpp and gcc, in linemap's expanded_location and in > > Dave> diagnostic messages, the "column" numbers are actually 1-based counts > > of > > Dave> *characters*, so the "column" numbers emitted in diagnostics for the > > Dave> start of the first token in each line are actually: > > > > FWIW this is actually in violation of the GNU coding standards. There's > > a bug open for it. However, I was always afraid to change this in cpp, > > since presumably it would break existing programs that read gcc's > > output. It's a bad situation because the standard can't be changed, > > either, as other programs (e.g., bison and I think Emacs) do follow it > > faithfully. > > Which programs rely on precise column numbers given by GCC? They cannot be > very old neither unused to pain.
I suspect quite a few GCC testcases for column numbers (and hardcoding the expected column numbers) will need updating if this bug is fixed, but I agree it should be fixed. -- Joseph S. Myers jos...@codesourcery.com
