Enumerating section symbols with clang/gcc (https://repl.it/@garettbass/clangsections)

clang_sections.c

#include <stdio.h>

#define CONCAT(A, B) _CONCAT(A, B)
#define _CONCAT(A, B) A##B

#define TOSTRING(...) _TOSTRING(__VA_ARGS__)
#define _TOSTRING(...) #__VA_ARGS__

#ifdef SECTION_DEFINITIONS
    #define _section_declaration_definition(SECTION) section_definition(SECTION)
#else
    #define _section_declaration_definition(SECTION)
#endif

#define section_declaration(SECTION)\
        void* CONCAT(SECTION,_begin)(void);\
        void* CONCAT(SECTION,_end)(void);\
        _section_declaration_definition(SECTION)\
        /**/

#define section_definition(SECTION)\
        void* CONCAT(SECTION,_begin)(void) {\
            extern void* CONCAT(__start_,SECTION);\
            return &CONCAT(__start_,SECTION);\
        }\
        void* CONCAT(SECTION,_end)(void) {\
            extern void* CONCAT(__stop_,SECTION);\
            return &CONCAT(__stop_,SECTION);\
        }\
        /**/

#define section_entry(SECTION)\
        __attribute((__section__(TOSTRING(SECTION))))

section_declaration(mysection) // declaration may appear more than once
section_definition(mysection) // definition must appear only once, defines endpoints
    
void print_mysection_entries(void)
{
    const void** const end = mysection_end();
    for (const void** itr = mysection_begin(); itr < end; ++itr)
    {
        const void* str = *itr;
        if (str)
            printf("%p : \"%s\"\n", itr, (char*)str);
        else
            printf("%p : null\n", itr);
    }
}

int main(void)
{
    section_entry(mysection)
    static const char* mysection_0 = "mysection_0";

    section_entry(mysection)
    static const char* mysection_1 = "mysection_1";

    section_entry(mysection)
    static const char* mysection_2 = "mysection_2";

    print_mysection_entries();
    puts("DONE");
    return 0;
}