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 Run
now it works! now i can use nim with openacc for hpc by gpu! yeah~