y.cgo1.go       # for gc
	_cgo_gotypes.go # for gc
	_cgo_import.go  # for gc (if -dynout _cgo_import.go)
	x.cgo2.c        # for gcc
	y.cgo2.c        # for gcc
	_cgo_defun.c    # for gcc (if -gccgo)
	_cgo_export.c   # for gcc
	_cgo_export.h   # for gcc
	_cgo_main.c     # for gcc
	_cgo_flags      # for build tool (if -gccgo)

The file x.cgo1.go is a copy of x.go with the import "C" removed and

  """Set GCC_HOST_COMPILER_PATH."""
  default_gcc_host_compiler_path = shutil.which('gcc') or ''

  gcc_host_compiler_path = prompt_loop_or_load_from_env(
      environ_cp,
      var_name='GCC_HOST_COMPILER_PATH',
      var_default=default_gcc_host_compiler_path,
      ask_for_var='Please specify which gcc should be used by nvcc as the host '
      'compiler.',
      check_success=os.path.exists,