Re: named warnings & individual warning control

[Mark Mitchell <mark at codesourcery dot com>]

DJ Delorie wrote:

> > Note that you could get some of the same benefits by just adding the
> > #pragmas for the current warning groups,
> >    
>
> Partial patch (proof of concept, missing docs, changelog, etc), only
> works for options with the Var() syntax...  Comments?
>  
Looks plausible to me, except that I think you should be using a 
logarithmic method to find the matching string, not a linear method.

> Also, -O[23] tends to confuse this as they defer the use of warning
> flags until after the whole file is parsed, so pragmas between
> function definitions don't do what you expect :-(
I'm not sure what to say about the problem in the last paragraph; that's 
clearly a serious user interface issue.  This is part of why I have long 
argued that only front ends should be permitted to issue warnings, and 
that all attempts to use back-end data flow analysis to issue warnings 
are mistaken, no matter how clever they seem.

--
Mark Mitchell
CodeSourcery, LLC
(916) 791-8304
mark@codesourcery.com