1 files changed, 81 insertions, 0 deletions
diff --git a/test/Scanner/empty-implicit.py b/test/Scanner/empty-implicit.py
new file mode 100644
index 0000000..2112fd8
--- /dev/null
+++ b/test/Scanner/empty-implicit.py
@@ -0,0 +1,81 @@
+#!/usr/bin/env python
+#
+# __COPYRIGHT__
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
+
+"""
+Verify that Scanners are not called if a previous --implicit-cache
+run stored an empty list of implicit dependencies.
+"""
+
+import TestSCons
+
+test = TestSCons.TestSCons()
+
+test.write('SConstruct', r"""
+import os.path
+
+def scan(node, env, envkey, arg):
+    print 'XScanner: node =', os.path.split(str(node))[1]
+    return []
+
+def exists_check(node, env):
+    return os.path.exists(str(node))
+
+XScanner = Scanner(name = 'XScanner',
+                   function = scan,
+                   argument = None,
+                   scan_check = exists_check,
+                   skeys = ['.x'])
+
+def echo(env, target, source):
+    t = os.path.split(str(target[0]))[1]
+    s = os.path.split(str(source[0]))[1]
+    print 'create %s from %s' % (t, s)
+    open(t, 'wb').write(open(s, 'rb').read())
+
+Echo = Builder(action = Action(echo, None),
+               src_suffix = '.x',
+               suffix = '.x')
+
+env = Environment(BUILDERS = {'Echo':Echo}, SCANNERS = [XScanner])
+
+f1 = env.Echo(source=['f1_in'], target=['f1_out'])
+""")
+
+test.write('f1_in.x', 'f1_in.x\n')
+
+expect = test.wrap_stdout("""\
+XScanner: node = f1_in.x
+create f1_out.x from f1_in.x
+""")
+
+test.run(arguments = '--implicit-cache .', stdout = expect)
+
+# Run it again, and the output must contain only the "up to date" message,
+# *not* the line printed by the XScanner function.
+
+test.up_to_date(options = '--implicit-cache', arguments = '.')
+
+test.pass_test()