Differences in struct size when compiling C vs. C++

[inaky dot gonzalez at intel dot com]

Hi people

Tried this with gcc and g++ versions 2.95.4 and 3.0.3. I am looking
for some enlightment on why the struct's sizes are so wildly different
in C and in C++:


Compile with gcc:

$ gcc kk.c -o kk -Wall

output is: sizeof (struct A) 4, sizeof (struct B) 0

now with G++: 

$ g++ kk.c -o kk -Wall

output is: sizeof (struct A) 8, sizeof (struct B) 1


Why? :) I would expect this if there were vtables around, but I am
afraid there aren't any. Can anybody give me some insight? [pls copy
me, as I am not subscribed to the list]

    Thanks!

PS: Great compiler, though :)


-- begin kk.c...

#include <stdio.h>

struct A
{
  int d;
  struct {} c;
};

struct B
{
  struct 
  {
  } c;
};

int main (void)
{
  printf ("sizeof (struct A) %d, sizeof (struct B) %d\n",
          sizeof (struct A), sizeof (struct B));
  return 0;
}



-- 

 naky @ somewhere in time  --  e-ssing PQ even++