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Re: Printing to STDERR when %d is "Cannot access memory ..."


From: Eli Zaretskii
Subject: Re: Printing to STDERR when %d is "Cannot access memory ..."
Date: Wed, 13 Jun 2018 22:11:33 +0300

> Date: Wed, 13 Jun 2018 11:37:09 -0700
> From: Keith David Bershatsky <address@hidden>
> 
> I am working on crosshairs (17684) and multiple fake cursors (22873) and 
> created a little problem for myself in that a character not recognized by the 
> font (U0001D4D5) [aka a pretty letter f] on a line all by itself does not 
> have a font->space_width and causes Emacs to crash when printing said value 
> to STDERR.
> 
> GDB returns "Cannot access memory at address 0xa0" when printing the value of 
> font->space_width.

This message means that 'font' is a NULL pointer, and that is your
basic problem.  You need to find out why 'font' is NULL.



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