Replies to mailing list not listed as follow up to original message on mailing list archive

[Jozef Lawrynowicz]

Hi,

When I reply to a message on the mailing list, the reply doesn't get
listed as a reference or follow up to the message I replied to.
For example this
https://gcc.gnu.org/ml/gcc-patches/2017-05/msg01489.html was a reply
to this https://gcc.gnu.org/ml/gcc-patches/2017-05/msg01474.html but
the former has no reference to the latter.

Any tips for getting this to work? I'm using gmail with no special
configuration so I guess that might be part of the problem?

Thanks,
Jozef