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From: Robert Pluim <rpluim@gmail.com>
Newsgroups: gnu.emacs.bug
Subject: bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'
Date: Thu, 03 Sep 2020 16:03:53 +0200
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References: <7bb2d5e3-1abf-08d6-d7c8-0f1bd139815e@Alexander.Shukaev.name> <m2y2lr2uaw.fsf@gmail.com> <caae0787-d1bb-b4bf-93ff-c9e7f7147964@Alexander.Shukaev.name> <f0398105-c575-bcd7-0daa-54c6e1b2dbe9@Alexander.Shukaev.name> <m2mu272ppt.fsf@gmail.com> <3598262d-b65c-b1b4-310a-29149fd89ebf@Alexander.Shukaev.name> <m21rjj2nc5.fsf@gmail.com> <83k0xbuhdv.fsf@gnu.org> <m2blin0xfa.fsf@gmail.com>
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Cc: 43177@debbugs.gnu.org, emacs@Alexander.Shukaev.name
To: Eli Zaretskii <eliz@gnu.org>
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>>>>> On Thu, 03 Sep 2020 16:19:56 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Robert Pluim <rpluim@gmail.com>
    >> Date: Thu, 03 Sep 2020 11:58:50 +0200
    >> Cc: 43177@debbugs.gnu.org
    >>=20
    >> So this is the 'x' font backend, rather than the 'ftcr' font
    >> backend, which I would not expect emacs to be falling back to.

    Eli> Why do you think this is evidence of using the fallback backend?
    Eli> AFAIR, when Emacs needs to find a font for a character, it loops o=
ver
    Eli> all the fonts with all the available backends, and only later deci=
des
    Eli> which of the fonts to use.  Don't you see that if you type some
    Eli> character unlikely to have been seen in an "emacs -Q" session?

You=CA=BCre right, I=CA=BCd run through this in gdb, and set my breakpoint =
on
the wrong function.

'C-u C-x =3D' would tell us which backend ended up being used.

Robert