Nim/tests/compiler/tcmdlineoswin.nim

discard """
  cmd: "nim $target $options --os:windows $file"
  disabled: "linux"
  disabled: "bsd"
  disabled: "macosx"
  disabled: "unix"
  disabled: "posix"
"""

import strutils

static:
  #os is set to "linux" in toswin.nim.cfg, but --os:windows in command line should override it.
  doAssert cmpIgnoreCase(hostOS, "windows") == 0