>>>>> On Sun, 27 Oct 2019 09:26:35 +0100, Robert Pluim <rpluim@gmail.com> said:

>>>>> On Sat, 26 Oct 2019 02:44:52 -0700, Allen Li <darkfeline@felesatra.moe> said:
    >>> Hmm. Could you try the following against emacs-26 and see if it fixes
    >>> your crash? (the character will almost certainly end up displayed
    >>> wrong). This looks more like a fontconfig bug than anything else: the
    >>> pattern we've supplied to FcFontList explicitly says "donʼt give me
    >>> color fonts".

    Allen> Yep, this fixes the crash and I get the box with unicode codepoint
    Allen> inside.  I don't know anything about fontconfig, so I can't comment on
    Allen> whether this is a fontconfig bug.

    Robert> Thanks for testing. Iʼll have to write a standalone test case against
    Robert> fontconfig before I can say whether itʼs a fontconfig bug or not, in
    Robert> the meantime Iʼll clean up the patch.

I think itʼs a fontconfig bug, but Iʼve received no response from the
fontconfig guys. Perhaps I need to use their new-fangled issue tracker
thing rather than good old email. In any case, both Arch and Fedora 31
have fontconfig packages with this issue, so we need to paper^Wfix the
issue our end.