c/3952: comptypes() segfaults

[sirl@gcc.gnu.org]

Synopsis: comptypes() segfaults

State-Changed-From-To: open->analyzed
State-Changed-By: sirl
State-Changed-When: Tue Aug 21 14:49:58 2001
State-Changed-Why:
    I just saw a similar crash with gcc-3.0.1 (release) and it seems that this is just a missing null-pointer check. AFAICS TYPE_MAX_VALUE can legally be zero.
    I think the fix is sth similar to this:
    
            /* Sizes must match unless one is missing or variable.  */
            if (d1 == 0 || d2 == 0 || d1 == d2
                || ! TYPE_MAX_VALUE (d1) || ! TYPE_MAX_VALUE (d2)
                || TREE_CODE (TYPE_MIN_VALUE (d1)) != INTEGER_CST
                || TREE_CODE (TYPE_MIN_VALUE (d2)) != INTEGER_CST
                || TREE_CODE (TYPE_MAX_VALUE (d1)) != INTEGER_CST
                || TREE_CODE (TYPE_MAX_VALUE (d2)) != INTEGER_CST)
              break;
    
    I'm running a bootstrap .on powerpc-linux-gnu now. Robert, can you check if the fix above works for you too?

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