bug#3930: DocView failure - bad error message, insufficient documentation

[David Reitter]

This works for me now.

> On Aug 22, 2019, at 11:24 PM, Lars Ingebrigtsen <larsi@mouse.gnus.org> wrote:
> 
> David Reitter <david.reitter@gmail.com> writes:
> 
>> Trying to open a PDF file with Emacs/NS 23.1 branch (actually
>> Aquamacs, which has no relevant patches compared to the 23.1 branch),  
>> I keep getting a "DocView: process pdf/ps->png changed status to
>> trace/BPT trap." message in *Messages*.
>> 
>> This happens with all PDFs, even small PDF files.
>> 
>> The buffer that is shown is not updated to reflect the error status.
>> 
>> What's worse is that the error message that is given is absolutely
>> unhelpful.  It's unclear what "trace" or "BPT trap" means in this  
>> concept, or what the abbreviation "BPT" is supposed to mean.  This
>> does not help me as a user in addressing the error condition.
> 
> (I'm going through old bug reports that unfortunately haven't gotten any
> responses yet.)
> 
> The string "BPT trap" doesn't exist in the Emacs code base (at least not
> now), so I would suspect that it's an error message given by your OS?
> 
> Are you still seeing this problem in more modern Emacs versions?
> 
> -- 
> (domestic pets only, the antidote for overdose, milk.)
>   bloggy blog: http://lars.ingebrigtsen.no