Warning for incompatible functions declared 'extern "C"'?

[Nick]

On Thu, 2014-07-24 at 09:19 +0100, Jonathan Wakely wrote:
> That is valid C++ code. C linkage doesn't mean the function has to
> actually be usable from C.
> 
> You can also declare functions with C linkage that take reference
> parameters or throw exceptions.

I didn't know that.  Out of curiosity...I assumed that one of the
ramifications of declaring some code w/ C linkage was that it emitted
symbols that have C mangling.  Is that true?  If so, how are C++ antics
handled in this scenario?


> > My question is:  does GCC have a warning for this scenario?
> > Specifically, can it warn when something is declared extern "C" that's
> > incompatible with C linkage?
> 
> No, there is no such warning as far as I know.
> 
> Such a warning doesn't seem unreasonable, since *usually* (not not
> always) you want functions with C language linkage to be callable from
> C.

Ok well let me know if I should open an enhancement request ticket for
this.