Warning on C++ catch by value on non primitive types

[Mike Stump]

On Oct 12, 2005, at 2:20 PM, Thomas Costa wrote:
> gcc doesn't have such a warning at present.

Yup.

> Is this correct?


I suspect so.

> What are the chances of adding such a warning?

Zero, unless someone else wants it or you file a bug report asking  
for the enhancement.  Be sure to explain why it is a good idea,  
otherwise the chances of it happening could drop to zero.

> Is it basic enough to add to the 3.4.x and/or 4.x C++ front end  
> that I could help with the task?

Sure.

Look at the parser (gcc/cp/parser.c:cp_parser_handler) and set a  
break point there, follow it down into semantic processing, pick a  
nice place to do the checking, and then add the code to check it.

For it to be accepted, others would have to agree it is a good thing  
to have, for example, if it were in the Effective C++ book, you can  
argue that way.