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typedef struct
{
  int bla_u32;
  short bla_u16;
  char bla_u8;
 
  /* <-- this gap will be filled in the unpacked version */
}  uneven;
 
#define StaticAssert(cond, msg) switch(0){case 0:case cond:;}
 
void checkSizes()
{
  uneven unpacked;
#pragma pack(push, 1)
typedef struct
{
  int bla_u32;
  short bla_u16;
  char bla_u8;
 
  /* <-- this gap will be filled in the unpacked version */
}  uneven;
#pragma pack(pop)
  uneven packed;
  StaticAssert(sizeof(unpacked) == sizeof(packed), "uneven contains gaps");
}
 

prog.c: In function 'checkSizes':
prog.c:11:50: error: duplicate case value
 #define StaticAssert(cond, msg) switch(0){case 0:case cond:;}
                                                  ^
prog.c:27:3: note: in expansion of macro 'StaticAssert'
   StaticAssert(sizeof(unpacked) == sizeof(packed), "uneven contains gaps");
   ^
prog.c:11:43: error: previously used here
 #define StaticAssert(cond, msg) switch(0){case 0:case cond:;}
                                           ^
prog.c:27:3: note: in expansion of macro 'StaticAssert'
   StaticAssert(sizeof(unpacked) == sizeof(packed), "uneven contains gaps");
   ^

Standard output is empty