Please ensure Signed-off-by and similar trailers are hyphenated

[Jonathan Wakely]

On Mon, 15 Jun 2026 at 15:19, Christophe Lyon <christophe.lyon@arm.com> wrote:
>
>
>
> On 6/15/26 15:46, Jonathan Wakely via Gcc wrote:
> > https://git-scm.com/docs/git-interpret-trailers says:
> >
> > When reading trailers, there can be no whitespace before or inside the
> > <key>, but any number of regular space and tab characters are allowed
> > between the <key> and the separator. There can be whitespaces before,
> > inside or after the <value>. The <value> may be split over multiple
> > lines with each subsequent line starting with at least one whitespace,
> > like the "folding" in RFC 822.
> >
> > Formatting these Git trailers correctly ensures they can be used with
> > git-interpret-trailers and found with a simple 'git log --grep' query,
> > without having to match a mix of correct and incorrect forms using a
> > regex.  This is especially important for Signed-off-by: because the
> > DCO sign-off is legally significant and it makes things harder to
> > check if you use the wrong form of the tag.
> >
> > Please ensure that all trailers in Git commit messages are hyphenated,
> > e.g. "Co-authored-by:" not "Co-authored by:", and especially not
> > "Signed off by:"
>
> Is this something we can / want to add to
> contrib/gcc-changelog/git_check_commit.py ?


That's probably a good idea.