#!/usr/bin/python
import BoostBuild

t = BoostBuild.Tester()

t.write("foo.jam", r"""
import common ;
import generators ;
import modules ;
import type ;
import types/cpp ;
type.register FOO : foo ;
type.register BAR : bar ;
generators.register-standard foo.foo : FOO : CPP BAR ;
.touch = [ common.file-creation-command ] ;
local .sleep-delay = 2 ;
.sleep = sleep $(.sleep-delay) ;
if [ modules.peek : NT ]
{
    .sleep = ping 127.0.0.1 -n $(.sleep-delay) -w 1000 >NUL ;
}
actions foo
{
    $(.touch) "$(<[1])"
    $(.sleep)
    $(.touch) "$(<[2])"
}
""")
t.write("x.foo", "")
t.write("jamroot.jam", """\
import foo ;
lib x : x.foo : <link>static ;
""")


t.run_build_system()
t.run_build_system()  # Second build should not actually build anything.
t.expect_nothing_more()