Using the C preprocessor to determine the current area?

I am developing an application in C / Objective-C (No C ++, please, I already have a solution), and I came across an interesting use case.

Since clang does not support nested functions, my original approach will not work:

#define CREATE_STATIC_VAR(Type, Name, Dflt) static Type Name; __attribute__((constructor)) void static_ ## Type ## _ ## Name ## _init_var(void) { /* loading code here */ }

This code will compile with GCC, but since clang does not support nested functions, I get a compilation error:

Expected ';' at the end of the ad.

So, I found a solution that works for Clang for variables inside a function:

#define CREATE_STATIC_VAR_LOCAL(Type, Name, Dflt) static Type Name; ^{ /* loading code here */ }(); // anonymous block usage

However, I was wondering if there is a way to use the macro link to select the appropriate one for the situation, for example:

#define CREATE_STATIC_VAR_GLOBAL(Type, Name, Dflt) static Type Name; __attribute__((constructor)) void static_ ## Type ## _ ## Name ## _init_var(void) { /* loading code here */ }
#define CREATE_STATIC_VAR_LOCAL(Type, Name, Dflt) static Type Name; ^{ /* loading code here */ }(); // anonymous block usage

#define SCOPE_CHOOSER LOCAL || GLOBAL
#define CREATE_STATIC_VAR(Type, Name, DFLT) CREATE_STATIC_VAR_ ## SCOPE_CHOOSER(Type, Name, Dflt)

Obviously, the final implementation does not have to be that way, but something like that will be enough.

__builtin_constant_p __func__, __func__ , .

__builtin_choose_expr, .

- ? , - , , .

_{.. , CREATE_STATIC_VAR_GLOBAL CREATE_STATIC_VAR_LOCAL , , . , ++ , .}