Variable: font-log
font-log is a variable defined in font.c.
Value
t
Documentation
A list that logs font-related actions and results, for debugging.
The default value is t, which means to suppress logging. Set it to nil to enable logging. If the environment variable EMACS_FONT_LOG is set at startup, it defaults to nil.
Source Code
// Defined in /usr/src/emacs/src/font.c
DEFVAR_LISP ("font-log", Vfont_log, doc: /*
A list that logs font-related actions and results, for debugging.
The default value is t, which means to suppress logging.
Set it to nil to enable logging. If the environment variable
EMACS_FONT_LOG is set at startup, it defaults to nil. */);