GNU bug report logs - #28242
Batch mode compiling: Error messages are displayed with "invalid character" glyph bounding symbols.

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Message #41 received at 28242 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Alan Mackenzie <acm <at> muc.de>
Cc: 28242 <at> debbugs.gnu.org, Paul Eggert <eggert <at> cs.ucla.edu>
Subject: Re: bug#28242: Batch mode compiling: Error messages are displayed
 with "invalid character" glyph bounding symbols.
Date: Sun, 27 Aug 2017 12:47:21 -0400

If your system has the same issue with gcc warnings (and if you choose
not to answer the question, a cynic like me will assume it does), then
your system is misconfigured, and it's not important to improve Emacs's
support for it.

Don't set LANG to a UTF8 locale if your font doesn't support it.
gcc went through the same issue years ago. Eg

https://stackoverflow.com/questions/6537520/strange-characters-present-in-gcc-compilation-output-message-on-console

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