[Bug c++/55203] No unused warning for variables of non-trivial types

[l.lunak at suse dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55203

Lubos Lunak <l.lunak at suse dot cz> changed:

           What    |Removed                     |Added
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           Severity|normal                      |enhancement

--- Comment #1 from Lubos Lunak <l.lunak at suse dot cz> 2012-11-04 11:04:01 UTC ---
As the compiler cannot tell for sure in some cases, such as the ctor calling an
external function, the only reasonable way of handling this I see is explicit
tagging of types for which there should be an unused warning if only ctor/dtor
are called for a variable. Here's my attempt at attribute warn_unused.