Re: New-ish warning in refs.c with GCC (at least 11.2) under -O3

> +	/*
> +	 * Should be a noop per the ALLOWED_FLAGS check above, but this
> +	 * is necessary to work around a problem with some versions of
> +	 * "gcc -O3 -Wnonnull", which otherwise thinks that you can have the
> +	 * flag set with a NULL new_oid.
> +	 */
> +	flags &= ~REF_HAVE_OLD | REF_HAVE_NEW;

>  	flags |= (new_oid ? REF_HAVE_NEW : 0) | (old_oid ? REF_HAVE_OLD : 0);
>  
>  	ref_transaction_add_update(transaction, refname, flags,
>
> I do find it interesting that gcc really _is_ convinced that those flags
> can be set coming in, since clearing them makes the problem go away.
> ...
> Reading over the code, it all looks OK. And that size is...weirdly huge.