On 23 July 2019 16:21:18 CEST, luigi scarso <luigi.scarso@gmail.com> wrote:
>On Tue, Jul 23, 2019 at 1:03 PM Marcel Fabian Krüger <tex@2krueger.de>
>wrote:
>
>> Hi,
>>
>> whenever LuaTeX loads a TTF font but only uses a single glyph,
>> which happens to be the notdef glyph (GID=0), LuaTeX complains about
>>
>>     (type 2): there are no glyphs in the subset
>>
>> Of course this isn't true, because the notdef *is* in the subset.
>>
>> This happens because LuaTeX always includes the notdef glyph, so it
>is
>> never counted. The problem can be fixed by explicitly testing for
>this
>> case.
>>
>>
>Do you have an example ?

Of course:

\starttext
\font\test=logix.ttf\test
\char"F0000
\stoptext

See https://github.com/u-fischer/luaotfload/issues/73 for some context.