A tutorial said
You cannot declare functions within a block as static.
What is the reason?How does it affect the function?
static
when applied to functions means that the function has internal linkage . ie it can be accessed within this file only. In other words it has file-scope . This linkage applies irrespective of whether you declare a function inside another function or outside of all of them.
Now, if you apply the static
keyword to a function declaration inside another block/function, semantically speaking , you are trying to restrict the scope of the function to that particular block/function, which goes against the language rules that state that static
functions, irrespective of their place of declaration, shall have file-scope.
And hence, the standard might be prohibiting such a declaration.
PS : Footnote 30
in 6.2.3
in the latest C11 standard states-
A function declaration can contain the storage-class specifier static only if it is at file scope;
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