Can't build TTF and variable

[simoncozens]

I'm sure this used to work...

$ fontmake -o ttf variable -g sources/NotoSerifOriya.glyphs
INFO:fontmake.font_project:Building master UFOs and designspace from Glyphs source
INFO:glyphsLib.classes:Parsing "sources/NotoSerifOriya.glyphs" file into <GSFont>
WARNING:glyphsLib.builder.builders.UFOBuilder:Non-existent glyph class public.kern1.gadaorya found in kerning rules.
WARNING:glyphsLib.builder.builders.UFOBuilder:Non-existent glyph class public.kern1.nnannaUIorya found in kerning rules.
fontmake: Error: In 'sources/NotoSerifOriya.glyphs' -> 'master_ufo/NotoSerifOriya.designspace': Generating fonts from Designspace failed: save_otfs() got an unexpected keyword argument 'optimize_gvar'

[belluzj]

I added a test here: #913 but before I look into "fixing" it, Cosimo says it might not be a supported use-case, so more like a new feature request? @anthrotype if you can say more

[anthrotype]

Building both a variable font and static fonts in the same invocation is currently not supported. The pipeline bifurcates depending on whether output formats are variable or not. Also, building -o ttf from a .glyphs source is unlikely to make sense in production, as you will miss the instance custom parameters which are only applied when you pass the -i option (similarly incompatible with -i variable).
What is your use case scenario? I would simply suggest you call different fontmake commands with the -o variable and -i -o ttf