No code for 0-operand extracts?

[Doug Evans]

Ben Elliston writes:
 > CGEN's generation of extraction code includes supporting variables for
 > extracting operands even for instructions with no operands.  This makes GCC
 > go crazy at high warning levels.  Is it easy to skip this if the instruction
 > has no operands?

You'll have to be more specific.

[one might infer this is the `attribute unused' aversion that has
been bantered about]