luatex font path problem

[Arthur Tu]

After lualatex command, file 
"~/.cache/texmf/luatex-cache/generic/names/otfl-names.lua" was generated.

Entry like this for example
   {
    ["familyname"]="SimSun",
    ["filename"]={ "c:/windows/fonts/simsun.ttc", 0 },
    ["fontname"]="SimSun",
    ["fullname"]="SimSun",
    ["names"]={
     ["family"]="SimSun",
     ["fullname"]="SimSun",
     ["psname"]="SimSun",
     ["subfamily"]="Regular",
    },
    ["size"]={},
    ["slant"]=0,
    ["weight"]=400,
    ["width"]=5,
   },

when I used \setmainfont{SimSun}, error occured that SimSun font not found.
When i used \setmainjfont[Path=/cygdrive/c/windows/fonts/]{simsun.ttc} 
and specify the path in *unix-style, it works.

So i think this is another mixed path style problem in cygwin.
Even though the fonts in system dir are listed in otfl-names.lua, they 
can't be accessed because their pathes are in windows-style.

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