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Re: named warnings & individual warning control

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

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