Hans van der Meer wrote:

When I compile luatex at first my CFLAGS and CXXFLAGS environment variables are honoured, but after starting to compile files in luafontforge I see the default "g -O2" coming, not my settings. Why is this?

Because of lack of knowledge on my part. It is not intentional, but supporting CFLAGS it was not explicitly intended either. You can use XCFLAGS instead (and XLDFLAGS for ld), that works at least for my purposes

Is something somewhere reset?

No doubt about that. I'll try to do a cleaner import when I update to the next fontforge release, but that is not trivial because I don't want to include (or even build) a full ff release. Best wishes, Taco