On Fri, Oct 13, 2000 at 07:11:10PM -0400, Jeremy Hylton wrote:
If you configure using '--with-pydebug' you get a lot of compile-time warnings.
../../Python/ceval.c: In function `eval_code2': ../../Python/ceval.c:672: warning: value computed is not used ../../Python/ceval.c:675: warning: value computed is not used ../../Python/ceval.c:678: warning: value computed is not used ../../Python/ceval.c:680: warning: value computed is not used ../../Python/ceval.c:681: warning: value computed is not used [etc.]
I assume these are caused by the definition of Py_INCREF #define Py_INCREF(op) (_Py_RefTotal++, (op)->ob_refcnt++)
Is there some way to change this macro so that the warnings are silenced?
Yes, prefix it with '(void)': #define Py_INCREF(op) (void)(_Py_RefTotal++, (op)->ob_refcnt++) However, that means that the 'return value' of Py_INCREF() must never be used anywhere. (If it does, it'll generate an error.) The return value of Py_INCREF() is not terribly useful, though. Both in debug and in normal mode, it expands to the refcount of the object *before* it was INCREF'd. I still consider this kind of warning (I've seen it before, always with macros that do several things by using the otherwise fairly useless tuple-creator in C ;) a bit of a bug in gcc: it knows both those statements have sideeffects, and it's obvious we want to throw away the first result, so why worry about the second ? But at least it isn't screwing up floating-point operations, and nobody's perfect :-) -- Thomas Wouters <thomas@xs4all.net> Hi! I'm a .signature virus! copy me into your .signature file to help me spread!