[cfe-dev] Why this extern "C" fails ?

[Renato Golin]

On 30 July 2013 09:08, David Chisnall <David.Chisnall at cl.cam.ac.uk> wrote:

> #include <iostream>
>
> int main() {
>   {
>     extern "C" int a = 42;
>     { std::cout << a << "\n"; }
>   }
>   return (0);
> }
>
> This also fails to compile.  I'm not sure what you'd expect the semantics
> to be.  The variable a has automatic storage, and so a linkage specifier
> makes no sense in this context.
>

This code fails to compile because: "variable declarations with the extern
specifier at block scope refer to declarations that are members of an
enclosing namespace, but they do not introduce new names into that scope."
3.3.2-10.

Ajit, your example contains several invalid C/C++ semantics, I'm really not
sure how you got this code, or why you want to change the linkage semantics
of a local variable.

Honestly, you'd have more luck on dissecting the C++ standard at
comp.lang.c++, not here.

cheers,
--renato
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