echo "(MAPFONT D 0 (FONTNAME cmb10))" > myfont.vpl tftopl cmb10 >> myfont.vpl vptovf myfont.vpl rm myfont.vpl vftovp -charcode-format=octal myfont.vf > myfont.ovp rm myfont.tfm myfont.vf ovp2ovf myfont.ovp luatex '\font\f=myfont\end'
Here, I cannot reproduce the warning for both of 32bit and 64bit binaries on Windows: This is LuaTeX, Version beta-0.80.0 (TeX Live 2016/W32TeX/dev) (rev 5238) restricted \write18 enabled. No pages of output. Transcript written on texput.log.
Also, "man ofm2opl" says about "-charcode-format" option, which does not exist:
Sorry, that describes on the legacy WEB version, now we call it as 'wofm2opl'. Try wofm2opl --help. In the C version, 'ofm2opl', the corresponding option is -char-format. Best, Akira