API and ABI addition: identifier a is new
 is now defined at t/01_fundamental/source/foo.c:1:
extern char a;

API and ABI addition: identifier as is new
 is now defined at t/01_fundamental/source/foo.c:2:
extern signed char as;

API and ABI addition: identifier au is new
 is now defined at t/01_fundamental/source/foo.c:3:
extern unsigned char au;

API and ABI addition: identifier b is new
 is now defined at t/01_fundamental/source/foo.c:4:
extern short int b;

API and ABI addition: identifier bu is new
 is now defined at t/01_fundamental/source/foo.c:5:
extern unsigned short int bu;

API and ABI addition: identifier c is new
 is now defined at t/01_fundamental/source/foo.c:6:
extern int c;

API and ABI addition: identifier cu is new
 is now defined at t/01_fundamental/source/foo.c:7:
extern unsigned int cu;

API and ABI addition: identifier d is new
 is now defined at t/01_fundamental/source/foo.c:8:
extern long int d;

API and ABI addition: identifier du is new
 is now defined at t/01_fundamental/source/foo.c:9:
extern unsigned long int du;

API and ABI addition: identifier e is new
 is now defined at t/01_fundamental/source/foo.c:10:
extern long long int e;

API and ABI addition: identifier eu is new
 is now defined at t/01_fundamental/source/foo.c:11:
extern unsigned long long int eu;

API and ABI addition: identifier f is new
 is now defined at t/01_fundamental/source/foo.c:12:
extern void * f;

API and ABI addition: identifier g is new
 is now defined at t/01_fundamental/source/foo.c:13:
extern _Bool g;

API and ABI addition: identifier h is new
 is now defined at t/01_fundamental/source/foo.c:14:
extern float h;

API and ABI addition: identifier i is new
 is now defined at t/01_fundamental/source/foo.c:15:
extern double i;

API and ABI addition: identifier j is new
 is now defined at t/01_fundamental/source/foo.c:16:
extern long double j;

API and ABI addition: identifier l is new
 is now defined at t/01_fundamental/source/foo.c:17:
extern enum
  {
    k = 0,
  } l;

ABI is not backward-compatible
API is not backward-compatible
