A-25 Bitfields of greater than field size

[Jason Merrill]

It seems to me that

struct A {
  ...
  signed char c: 32;
  ...
};

should be treated like

struct A {
  ...
  int i: 32;
  ...
};

except that only the low 8 bits are significant.  This should be true
whether or not there is actually a 32-bit type on the target.

Jason