Thread: struct attributes and typedefs

I'm trying to define a struct and typedef it with a single statement. I'm following the example described herehttps://gcc.gnu.org/onlinedocs/gcc-3...ttributes.html but I seems to be having a problem with even the code listed on this page.

Code:

#include <stdint.h>


typedef int more_aligned_int __attribute__ ((aligned(8)));
typedef struct TestCase
{
    uint8_t data;
    char nothings;
    uint64_t not_nothing;
} wait_status_ptr_t __attribute__((__packed__));


int main(int argc, char **argv)
{
    //wait_status_ptr_t wait;


    return 0;
}

The integer typedef works correctly but with the struct typedef I get.

Code:

main.c:9:1: warning: ‘__packed__’ attribute ignored [-Wattributes]
 } wait_status_ptr_t __attribute__((__packed__));
 ^

Originally Posted by Salem

If you declare the struct and the typedef for it separately, it makes a bit more sense.

But you can still do it in one.

Code:

#include <stdio.h>
#include <stdint.h>


typedef int more_aligned_int __attribute__ ((aligned(8)));
typedef struct  __attribute__((__packed__)) TestCase
{
  uint8_t data;
  char nothings;
  uint64_t not_nothing;
} wait_status_ptr_t;


int main(int argc, char **argv)
{
  wait_status_ptr_t wait;
  printf("%zd\n",sizeof(wait));
  
  return 0;
}

Yes, a definition followed by a typedef makes much more sense but I was trying to follow some coding style.

The suggested solution works (you're the best!) but doesn't quite match the coding style either so I'll stick to separate statements.