bug#20858: 25.0.50; Strange messages in the output of 'autogen.sh' (from MSYS2 bash)

[Glenn Morris]

Glenn Morris wrote:

> Dani Moncayo wrote:
>
>> Running 'autoreconf -fi -I m4' ...
>> main::scan_file() called too early to check prototype at
>> /usr/bin/aclocal-1.11 line 644.
>> Unescaped left brace in regex is deprecated, passed through in regex;
>> marked by <-- HERE in m/\${ <-- HERE ([^ \t=:+{}]+)}/ at
>> /usr/bin/automake-1.11 line 4159.
>
> Presumably you get exactly the same if you just run
>
>     autoreconf -fi -I m4
>
> So this is an issue with your autotools installation, and nothing to do
> with Emacs.

I'm going to guess that your're using perl 5.22:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=787531

The other issue is apparently fixed in automake 1.12:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=752784