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"""
This configuration is for timing how we evaluate long chains of
dependencies, specifically when -j is used.

We set up a chain of 100 targets that get built from a Python function
action with no source files (equivalent to "echo junk > $TARGET").
Each target explicitly depends on the next target in turn, so the
Taskmaster will do a deep walk of the dependency graph.

This test case was contributed by Kevin Massey.  Prior to revision 1468,
we had a serious O(N^2) problem in the Taskmaster when handling long
dependency chains like this.  That was fixed by adding reference counts
to the Taskmaster so it could be smarter about not re-evaluating Nodes.
"""

target_cnt = 100

env = Environment()

def write_file( env, target, source ):
    path_target = env.File( target ).path
    outfile = open( path_target, 'w' )
    outfile.write( 'junk' )
    outfile.close()

list = []
for i in range( target_cnt ):
    target = 'target_%03d' % i
    env.Command( target, [], write_file )
    env.Depends( target, list )
    list.append( target )