static alignment and hash sync

[Andrew Haley]

Tom Tromey writes:
 > >>>>> "Tony" == Tony Kimball <alk@pobox.com> writes:
 > 
 > Tony> Since you ask, I suppose I might try again, harder.  I apologize,
 > Tony> but my current thinking is that my current trajectory (disabling hash
 > Tony> sync) is as likely to be productive (both for gcj and myself) as
 > Tony> backtracking to redo that step, so I will continue along it for a
 > Tony> while.
 > 
 > Whatever works for you is fine by me.  You're doing the work...
 > I didn't know if you were aware of __attribute__((aligned)).

It's importsant to use __attribute__((aligned)) correctly on a type.
This program demonstrates the correct and incorrect use of aligned
better than I can explain.


#include <cstdio>

class a
{
  int b;
};

a __attribute__ ((aligned (8))) b;
a c __attribute__ ((aligned (8)));

class d : a {} __attribute__ ((aligned (8)));
int e __attribute__ ((aligned (8)));

typedef int my_int __attribute__ ((aligned (8)));
my_int g;

int main ()
{
  printf ("%d %d %d %d %d %d %d\n",
	  __alignof__ (a),
	  __alignof__ (b),
	  __alignof__ (c),
	  __alignof__ (d),
	  __alignof__ (e),
	  __alignof__ (my_int),
	  __alignof__ (g)
	  );
  return 0;
}

Andrew.