Re: [PATCH 06/13] reftable: (de)serialization for the polymorphic record type.

From: Junio C Hamano <gitster@pobox.com>
Date: Sep 20, 2020, 01:00 UTC
Message-ID: <xmqqlfh5i7nk.fsf@gitster.c.googlers.com>
In-Reply-To: <791f69c000556e93bf5fcfc0ec9304833b12565b.1600283416.git.gitgitgadget@gmail.com>

"Han-Wen Nienhuys via GitGitGadget" <gitgitgadget@gmail.com> writes:

Show 14 quoted lines

> +static void reftable_log_record_key(const void *r, struct strbuf *dest)
> +{
> +	const struct reftable_log_record *rec =
> +		(const struct reftable_log_record *)r;
> +	int len = strlen(rec->refname);
> +	uint8_t i64[8];
> +	uint64_t ts = 0;
> +	strbuf_reset(dest);
> +	strbuf_add(dest, (uint8_t *)rec->refname, len + 1);
> +
> +	ts = (~ts) - rec->update_index;
> +	put_be64(&i64[0], ts);
> +	strbuf_add(dest, i64, sizeof(i64));
> +}

We seem to be getting

reftable/record.c: In function 'reftable_log_record_key':
reftable/record.c:578:2: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  put_be64(&i64[0], ts);
    ^
        CC reftable/refname.o

when this series is merged to 'seen'.

cf. e.g. https://travis-ci.org/github/git/git/jobs/728655368

Thanks.