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#include <stdlib.h>
#include <string.h>
 
#define AAS_STRICT
 
#ifdef AAS_STRICT
typedef struct { char a; } *aas_t;
#else
typedef char *aas_t;
#endif
 
#define AAS_DYNAMIC             'D'
#define AAS_STATIC              'S'
 
#define AAS_STATIC_PREFIX       "S"
#define AAS_CONST_STR(str)      ((aas_t) ((AAS_STATIC_PREFIX str) + 1))
 
aas_t aas_allocate(size_t count) {
    char* buffer = malloc(count + 2);
    if(buffer == NULL)
        return NULL;
 
    *buffer = AAS_DYNAMIC;
 
    return (aas_t) buffer + 1;
}
 
void aas_free(aas_t aas) {
    if(aas != NULL) {
        char* buffer = ((char*) aas) - 1; 
        if(*buffer == AAS_DYNAMIC) {
            free(buffer);
        }
    }
}
 
int main() {
    char* s1 = AAS_CONST_STR("test1");
    char* s2 = aas_allocate(10);
 
    strcpy(s2, "test2");
 
    aas_free(s1);
    aas_free(s2);
}

prog.c: In function 'main':
prog.c:16:33: error: initialization from incompatible pointer type [-Werror]
 #define AAS_CONST_STR(str)      ((aas_t) ((AAS_STATIC_PREFIX str) + 1))
                                 ^
prog.c:38:16: note: in expansion of macro 'AAS_CONST_STR'
     char* s1 = AAS_CONST_STR("test1");
                ^
prog.c:39:16: error: initialization from incompatible pointer type [-Werror]
     char* s2 = aas_allocate(10);
                ^
prog.c:43:14: error: passing argument 1 of 'aas_free' from incompatible pointer type [-Werror]
     aas_free(s1);
              ^
prog.c:28:6: note: expected 'aas_t' but argument is of type 'char *'
 void aas_free(aas_t aas) {
      ^
prog.c:44:14: error: passing argument 1 of 'aas_free' from incompatible pointer type [-Werror]
     aas_free(s2);
              ^
prog.c:28:6: note: expected 'aas_t' but argument is of type 'char *'
 void aas_free(aas_t aas) {
      ^
cc1: all warnings being treated as errors

Standard output is empty