[Bug sim/31181] sim: cris: decode unused base_insn variable warnings

["vapier at gentoo dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31181

--- Comment #4 from Mike Frysinger <vapier at gentoo dot org> ---
(In reply to Hans-Peter Nilsson from comment #3)
> My point is that *these two files* would be the only files that got
> -Wno-error=unused-variable.

i understand what you're suggesting.  my point still stands.  this assumes that
the toolchain used to compile the sim recognizes & accepts (or silently
ignores) "-Wno-error=unused-variable".  the sim, like all binutils+gdb
projects, test the toolchain and whether it supports -W flags before using
them.  we have to add a test for -Wno-error=unused-variable, a variable for it,
and then expand that for these 2 files.  seems a lot easier to fix the origin,
especially when enabling warnings has a proven history of uncovering real bugs.

> You say, you've looked for, but not found, a
> bug-reason why the warnings appear, in this generated code, presumably
> including looking at the generator.

the generator appears to be cgen lisp which uses the lisp cpu definitions.  the
cgen code is not easy to follow at all, or trace back which funcs generate
which lines.  i was hoping you, as author of much of this code, would be able
to pick out & fix things much quicker than i.

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