FYI I was following the instructions here: https://github.com/tonsky/FiraCode/wiki/Emacs-instructions#using-composition-char-table to get Fira Code ligatures globally. It so happens that C-modes will add “//“ to the mode name in certain configurations; I just pared this down to a minimal repro case.
--
Evan Moses
emoses@gmail.com
On Jul 24, 2020, at 11:25 PM, Eli Zaretskii <eliz@gnu.org> wrote:
From: Evan Moses <emoses@gmail.com>
Date: Fri, 24 Jul 2020 14:35:50 -0700
To reproduce, evaluate this
(set-char-table-range composition-function-table 47 '([".\\(?:\\(?:\\*\\*\\|//\\|==\\)\\|[*/=>]\\)" 0
font-shape-gstring]))
And then evaluate
(setq mode-name "test//")
Emacs will become unresponsive and consume 100% CPU.
It doesn't hang here. Could this be macOS-specific? Or maybe theproblem happens only with some fonts? Does it happen in "emacs -Q"?In any case, did you really mean for Emacs to produce ligatures on themode line? More generally, what kind of ligatures are you trying toproduce with this setup?