Hi,
I think you are referring to C89 standard. Newer version of GCC might
have switched to newer version of the C standard. So, try to compile
your code with -std=c89?
--
Best regards,
Tadeus
On Fri, Feb 16, 2018 at 3:41 PM, Andrew Makhorin <mao@xxxxxxx> wrote:
> Hello,
>
> On compiling the following code with gcc (Debian 4.7.2-5) 4.7.2:
>
> int foo(int x, int y)
> {
> extern int bar();
> return bar(x, y);
> }
>
> static int bar(int x, int y)
> {
> return x + y;
> }
>
> I get the following error:
>
> mao@corvax:~/Desktop$ gcc -c test.c
> test.c:7:15: error: static declaration of 'bar' follows non-static
> declaration
> test.c:3:21: note: previous declaration of 'bar' was here
>
> However, the Standard says [6.1.2.2 Linkages of identifiers]:
>
> If the declaration of an identifier for an object or a function
> contains the storage-class specifier extern, the identifier has the
> same linkage as any visible declaration of the identifier with file
> scope.
>
> There is no other way to declare 'bar' as static in block scope,
> because it is a function, so this error confuses me. Could anyone
> explain this? Should it be a warning rather than error? I'd like to note
> that my code is compiled successfully with older versions of gcc and
> with many other C compilers.
>
>
> Thanks,
>
> Andrew Makhorin
>
>
