Re: strange result for escaping "\" with other font-name

[Masamichi HOSODA]

>>>> Second, your 2.19.26's fontconfig configure files
>>>> do not seem to have substitute settings.
>>>
>>> It's not clear to me why this happens. Is it a LilyPond-problem or
>>> something at my part?
>>> With 2.18.2 and 2.19.26 I'm on a 64-bit LINUX
>>> Trying with a build from master, lilyDev (32bit Debian), I do get
>>> substitute settings
>>>
>>> If I try
>>> \version "2.19.26"
>>> \markup \override #'(font-name . "not existing font") "\\<==what?"
>>>
>>> I do get substitute settings as well.
>>
>> According to the log file, your 2.19.26's fontconfig
>> default top configure file is
>> /home/hermann/lilydevel/usr/etc/fonts/fonts.conf
>>
>> And, maybe,
>> /home/hermann/lilydevel/usr/etc/fonts/local.conf
>> /home/hermann/lilydevel/usr/etc/fonts/conf.d/*.conf
>> are fontconfig auxiliary configure files.
>>
>> Your 2.18.2's one are
>> /home/hermann/lilypond/usr/etc/fonts/fonts.conf
>> /home/hermann/lilypond/usr/etc/fonts/local.conf
>> /home/hermann/lilypond/usr/etc/fonts/conf.d/*.conf
>>
>> Would you compare them?
> 
> I don't have the skills to appraise what I see.
> Here's a simple diff. Is this sufficient?
> 
> diff /home/hermann/lilydevel/usr/etc/fonts/fonts.conf
> /home/hermann/lilypond/usr/etc/fonts/fonts.conf
> 28,29d27
> <     <dir prefix="xdg">fonts</dir>
> <     <!-- the following element will be removed in the future -->
> 39c37
> <         <edit name="family" mode="assign" binding="same">
> ---
>>         <edit name="family" mode="assign">
> 51c49
> <         <edit name="family" mode="assign" binding="same">
> ---
>>         <edit name="family" mode="assign">
> 63c61
> <         <edit name="family" mode="assign" binding="same">
> ---
>>         <edit name="family" mode="assign">
> 76,77d73
> <     <cachedir prefix="xdg">fontconfig</cachedir>
> <     <!-- the following element will be removed in the future -->

Would you try following command?

$ diff -ursN /home/hermann/lilydevel/usr/etc/fonts 
/home/hermann/lilypond/usr/etc/fonts