The following demonstrates cases that would erroneously be allowed (and misleadingly give a size of 0) before:
#include <stdio.h>
struct s *S;
int main(void)
{
printf("%lu %lu\n", sizeof(struct s), sizeof *S);
}
ORCA/C previously allowed struct/union members to be declared with incomplete type. Because of this, it allowed C99-style flexible array members to be declared, albeit by accident rather than by design. In some basic testing, these seem to work correctly, except that they could be initialized and that would give rise to odd behavior.
I have restricted it to allowing flexible array members only in the cases allowed by C99/C11, and otherwise disallowing members with incomplete type. I have also prohibited initializing flexible array members.
This may be someone trying to use a C11-style anonymous struct/union, which should be flagged as an error until and unless those are supported. Otherwise, it probably just indicates that the programmer is confused. In any case, an error should be flagged for it.
C89 restricts bit fields to (signed) int and unsigned int only, although later standards note that additional types may be supported. ORCA/C supports the other integer types as an extension.
This fixes the compco01.c test case.
This occurred because the code to handle the function-like macro use would read the following token, which could prompt processing of the following preprocessing directive in an inappropriate context.
The following example illustrates the problem (the error message would be printed):
#define A()
#define FOO 1
A()
#if !FOO
# error "shouldn't get here"
#endif
