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[Bug c++/36760] Simple std::bind use causes warnings with -Wextra



------- Comment #6 from mark at codesourcery dot com  2008-07-08 16:32 -------
Subject: Re:  Simple std::bind use causes warnings with -Wextra

paolo dot carlini at oracle dot com wrote:

> Thanks Tom. In fact, yesterday I was writing without remembering my past
> analyses of this type of issue, with system header warnings not suppressed:
> TREE_NO_WARNING is *not* generically uses for that. Everything boils down to
> DECL_IN_SYSTEM_HEADER  on the decl instead.

Why is it reasonable for a libstdc++ header to return a cv-qualified 
type, but not for user code to do so?

In general, the system-header hack is to work around things we don't 
control; we need to accept weird code in <stdio.h> because the OS 
distributor controls that, not us.  But, if it's not practical for 
libstdc++ to avoid this warning, then it's probably not practical for 
users to avoid it either, so then I wonder how beneficial the warning 
is.  On the other hand, I'd expect that libstdc++ could just avoid the 
warning, by using a traits class to strip the cv-qualifier?

Thanks,


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36760


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