[Bug c/37041] -Wc++-compat refinements

[egall at gwmail dot gwu.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37041

--- Comment #7 from Eric Gallager <egall at gwmail dot gwu.edu> ---
(In reply to Manuel López-Ibáñez from comment #6)
> (In reply to Eric Gallager from comment #5)
> > #ifdef __cplusplus
> > extern "C" {
> > #endif
> > 
> > /* code that is C-only */
> 
> This is not what extern "C" means. The code still needs to be valid C++ and
> this is why -Wc++-compat would be useful here. For example, this is not
> valid C++ despite being valid C, and -Wc++-compat rightly warns you about it:
> 
> #ifdef __cplusplus
> extern "C" {
> #endif
> /* code that is C-only */
> int and(void);
> #ifdef __cplusplus
> }
> #endif /* __cplusplus */
> 

Oops, I made my example needlessly complicated. I should have just said:

#ifndef __cplusplus
/* code that is C-only */
int and(void);
#endif /* !__cplusplus */