[PATCH] PR14253: 'warn_unused' attribute for unused warning for non-POD types

[Lubos Lunak]

 Hello,

 could somebody please review the attached patch for PR14253?

 The equivalent GCC patch has been accepted (GCC bug #55203) and libstdc++ 
should use the attribute whenever I or somebody write the patch for it. 
Presumably this Clang patch should be followed by a patch for libc++ (I do 
not intend to do that).

-- 
 Lubos Lunak
 l.lunak at suse.cz
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