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Re: compile problem on older program




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On Sun, Oct 29, 2017 at 11:53:22AM +0100, Thomas Schmitt wrote:
> Hi,
> 
> tomas@xxxxxxxxxx wrote:
> > https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html
> 
> But my example code has no nested functions.
> The two functions are disjoint. The main() function only contains
> a type declaration by function prototype, not the function body.
> 
> I can change the code to plain K&R C and gcc still fails:
> 
>   static int bla(x)
>   int x;
>   {
>    return (x != 1);
>   }
>   int main()
>   {
>    static int bla();
>    return(bla(0));
>   }

Right. That's just the declaration...

> I found a quote in
>   https://stackoverflow.com/questions/22904848/what-is-c-local-function-declaration-mechanism
>   "The C standard contains the following. n1570/S6.7.1/7:
>    The declaration of an identifier for a function that has block scope
>    shall have no explicit storage-class specifier other than extern."
> 
> 
> I have N1548, which bears the same statement in 6.7.1 as subparagraph 6.
> This paragraph refers to "typedef", "extern", "static", "_Thread_local",
> "auto", and "register".
> A declaration within a function body has block scope, indeed.
> (6.2.1 subparagraph 4.)
> 
> So gcc is right when it refuses on "static". The obviousily once existing
> tolerance was inappropriate.
> I still wonder whether the forbidden storage classes would cause semantic
> problems, or whether they shall stay reserved for future use.

Yep. Thanks for the clarification (or should it be declarification? ;-)

> Have a nice day :)

Same :)
- -- t
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