[PATCH v2] sim: mark local insn var as unused [PR sim/31181]

[Jose E. Marchesi]

Looks good to me.

> Some insns are fully decoded by the time they execute here, and don't
> need to extract any more fields.  This leads to the local insn var
> being unused which triggers compiler warnings.  Mark it as unused so
> we don't require ports to stub it themselves.
>
> Bug: https://sourceware.org/PR31181
> ---
> v2
> - move decl to after the var name, not before the type
>
>  sim-decode.scm | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/sim-decode.scm b/sim-decode.scm
> index 19c0d4677424..5284da074166 100644
> --- a/sim-decode.scm
> +++ b/sim-decode.scm
> @@ -436,7 +436,13 @@ void
>     "    const IDESC *idesc = &" IDESC-TABLE-VAR "[itype];\n"
>     (if (> (length (sfmt-iflds sfmt)) 0)
>         (string-append
> -	"    CGEN_INSN_WORD insn = "
> +	"    CGEN_INSN_WORD insn"
> +	; Some insns are fully decoded by the time they get here, so they won't
> +	; access the insn variable.  Mark it as unused to avoid warnings.
> +	(if (adata-integral-insn? CURRENT-ARCH)
> +	    ""
> +	    " ATTRIBUTE_UNUSED")
> +	" = "
>  	(if (adata-integral-insn? CURRENT-ARCH)
>  	    "entire_insn;\n"
>  	    "base_insn;\n"))