[Bug c/53037] warn_if_not_aligned(X)

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53037

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2012-04-19 15:47:14 
UTC ---
Given

typedef unsigned long long __u64 __attribute__((aligned(4)));

all most all __u64 will be aligned at 4.   The only case we may
do something about is

typedef unsigned long long __u64
__attribute__((aligned(4),warn_if_not_aligned(8)));

struct foo
{
  int i1;
  int i2;
  int i3;

  __u64 x;
};

since alignment of the x field also depends on alignment of
struct foo.