(C question) (s - out.s) + func(&out) -> ?

[William Park]

Question for C expert...  Given the following

    char *s;
    struct { char *s; } out;
    char *func();

    s = (s - out.s) + func (&out);

where 'out' is changed inside function 'func'.  What I want is 
    - to calculate (s - out.s) first, then 
    - add that difference to pointer returning from func().
Here, order is important, because func() changes 'out'.

However, gcc is doing 
    s = func (&out) + (s - out.s);

Is pointer arithmetic always done as
    (pointer) + (int)
even if I write
    (int) + (pointer)
?

PS.  Of course, using intermediate variable solves the problem.  But, my
understanding is that '+' is left-to-right precedence.
-- 
William
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