Subject: Batch mode compiling: Error messages are displayed with "invalid character" glyph bounding symbols.

From: Alan Mackenzie <[email-masked]>
Date: Sat, 26 Aug 2017 13:06:08 +0000

Hello, Emacs.

On my new PC (Gentoo GNU/Linux), byte compiling in batch mode (e.g. with
make bootstrap in the master branch) is displaying warning messages with
symbols "quoted" by the invalid character glyph (a solid square) rather
than ` and '.  Presumably Emacs is attempting to use single curly
quotes.

This is ugly and not helpful.  A fix would be appreciated.

-- 
Alan Mackenzie (Nuremberg, Germany).