i found answer! i missed passL!!
nim c --cc:clang --clang.exe="nvc" --clang.linkerexe="nvc"
--passC:"-Minfo=accel -acc=gpu -gpu=cc86" --passL:"-acc=gpu -gpu=cc86"
-d:release nvc_test.nim
Runnow it works! now i can use nim with openacc for hpc by gpu! yeah~
