2017-08-05 9:30 GMT+02:00 Eli Zaretskii <eliz@gnu.org>:

> > From: Fabrice Popineau <fabrice.popineau@gmail.com>
> > Date: Sat, 5 Aug 2017 09:14:05 +0200
> > Cc: 27956@debbugs.gnu.org
> >
> > I had to "touch /path/to/emacs/lisp/files/*.elc" after installation to
> fix it.
>
> ??? Do you mean that compressing files with gzip doesn't preserve
> their time stamps?  It does here.  The gzip manual specifically says:
>
>      `gzip' reduces the size of the named files using Lempel-Ziv coding
>   (LZ77).  Whenever possible, each file is replaced by one with the
>   extension `.gz', while keeping the same ownership modes, access and
>   modification times.
>
> What version of gzip did you use?
>

Ok, you are right. There is a version 1.6 of gzip.exe  distributed with
TeXLive that has interfered here.
It doesn't preserve timestamps when compressing files. This is definitely a
problem, but not in emacs.

The 1.8 gzip.exe from MSYS2 does preserve timestamps.

Sorry for the noise.