> I haven't tried it, so this might be nonsense, but I think that YACC
> simply copies the emitted code from the source file to the final C
> file.
Yacc has to parse the emitted code enough to be able to replace references to
$$, $1, etc with the corresponding tokens from the recognized grammar element.
for example, a grammar I have lying around contains:
enum_mulable: enum_or_int
| '(' enum_expr ')'
{ $$ = $2; }
;
enum_or_int: INTEGER
| '-' INTEGER
{ $$ = -$2; }
| IDENT {
int value;
if (is_enum($1, &value)) {
$$ = value;
} else {
lexerror_nl("%s is not a
constant",$1);
$$ = 0;
}
}
;
Yacc changes those $ expressions into references into its value stack.
Thus, Objective-C may trip it up, but then again it may not.
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