skaller <[EMAIL PROTECTED]> writes: > In gcc/g++ version 4.0 there is no way to turn off the > unused variable warning enabled by -Wall with a command > line switch.
How about -Wno-unused-variable? > I think this is a bug: it should be possible to selectively > turn on or off all warnings (on the command line). There is work on progress to address that. > The advice in the documentation is to attach > > __attribute__((unused)) > > to the selected variable. This may be inappropriate for > three distinct reasons: > > (a) It is a GNU extension > (b) it clutters the code > (c) It isn't always easy to tell if a variable is unused While (a) and (b) are undeniable, (c) is not an issue; the attribute suppresses the unused warning, but does not cause any trouble if the variable is in fact used. To address (a) and (b), the gcc sources themselves do this: #ifndef ATTRIBUTE_UNUSED #define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) #endif /* ATTRIBUTE_UNUSED */ int fn (int arg ATTRIBUTE_UNUSED) Ian
