c has a size for void?

gistfile1.txt

$ cat voidsize.c 
#include <stdio.h>

int main(void) {
  printf("void size: %d\n", sizeof(void));
  return 0;
}
$ make voidsize
cc     voidsize.c   -o voidsize
voidsize.c: In function ‘main’:
voidsize.c:4: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’
[compiles]
-bash-3.2$ ./voidsize
void size: 1

but...


$ env CC=g++ make voidsize
g++     voidsize.c   -o voidsize
voidsize.c: In function ‘int main()’:
voidsize.c:4: error: invalid application of ‘sizeof’ to a void type
voidsize.c:4: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’
make: *** [voidsize] Error