On Mon, 11 Aug 2014 08:06:16 +0200 (CEST)
Werner LEMBERG <w...@gnu.org> wrote:
> >> extern "C" const char *Version_string = "1.22.2";
> >
> > extern "C" const char *Version_string;
> > const char *Version_string = "1.22.2";
> >
> > but I'm not sure if it's the proper way to solve this warning.
>
> Does
>
> extern "C" {
> const char *Version_string = "1.22.2";
> }
>
> work better?
It should. Stroustrup discusses the difference in 9.2.4 of The C++
Programming Language. His examples:
extern "C" {
int g1; // definition
extern int g2; // declaration
}
extern "C" int g1; // declaration
Although, he says, it "looks odd at first glance", it's a consequence
of the fact that the first form admits other code being #included.
In light of that,
extern "C" const char *Version_string = "1.22.2";
is problematic because storage for the pointer hasn't been defined.
My preference, though, would be
extern "C" {
const char Version_string[] = "1.22.2";
}
unless there is a need to have Version_string point to something else.
--jkl
