That C parser bug

[Charles M. Hannum]

Here's an even simpler case that shows the bug:

#define savechar(n) ((n > 0) ? 'a' : '\0')
foo(char *bufp)
{
    int x = 80;
    return ((*(bufp++) = savechar(x)));
}

It gets compiled (again, with `-O') as:

_foo:
	pushl %ebp
	movl %esp,%ebp
	movl 8(%ebp),%eax
	movb (%eax),%dl
	movsbl %dl,%eax
	leave
	ret

As you can see, it's actually returning bufp[0], and doesn't change
the value at all.

Anyway, I'll look into this some more.