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Subject: Re: [boost] Official warnings policy?
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-11-09 09:36:32

Patrick Horgan wrote:
> Phil Richards wrote:
> > On Thu, 2009-11-05 at 20:03 -0800, Steven Watanabe wrote:
> > > I've attached a patch that uses #pragma GCC system_header
> > From my understanding of this pragma, it turns off all
> > warnings from the header. Maybe I'm being incredibly
> > dumb, but isn't this a rather shotgun approach to the
> > problem? What if, by some chance, the header is
> > edited at some later stage and an issue is introduced
> > that would have generated (valid) warnings?
> Problem easily solved. In boost test builds using gcc use
> -Wsystem-headers to turn the warnings back on.

That's too broad in effect. It would enable warnings in headers that one doesn't want to hear from including, I suspect, those provided by the platform.

The best approach likely is a library specific mechanism that, by default, honors a Boost-wide config to disable warnings using #pragma GCC system_header. Then, all Boost libraries could disable the pragmas, when the Boost-wide configuration is adjusted, revealing warnings otherwise suppressed. Furthermore, individual libraries could be configured to ignore the Boost-wide setting to prevent the suppression of warnings in just that library, while the rest of Boost continues to suppress warnings.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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