1 files changed, 81 insertions, 0 deletions
diff --git a/tools/build/test/unused.py b/tools/build/test/unused.py
new file mode 100644
index 000000000..d7595547c
--- /dev/null
+++ b/tools/build/test/unused.py
@@ -0,0 +1,81 @@
+#!/usr/bin/python
+
+# Copyright 2003 Vladimir Prus
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+# Test that unused sources are at least reported.
+
+import BoostBuild
+
+t = BoostBuild.Tester(["-d+2"], use_test_config=False)
+
+t.write("a.cpp", "int main() {}\n")
+t.write("b.cpp", "\n")
+t.write("b.x", "")
+t.write("jamroot.jam", """\
+import "class" : new ;
+import modules ;
+import project ;
+import targets ;
+import type ;
+import virtual-target ;
+
+type.register X : x ;
+
+class test-target-class : basic-target
+{
+    rule construct ( name : source-targets * : property-set )
+    {
+        local result = [ property-set.empty ] ;
+        if ! [ modules.peek : GENERATE_NOTHING ]
+        {
+            result += [ virtual-target.from-file b.x : . : $(self.project) ] ;
+            if ! [ modules.peek : GENERATE_ONLY_UNUSABLE ]
+            {
+                result += [ virtual-target.from-file b.cpp : . : $(self.project)
+                    ] ;
+            }
+        }
+        return $(result) ;
+    }
+
+    rule compute-usage-requirements ( rproperties : targets * )
+    {
+        return [ property-set.create <define>FOO ] ;
+    }
+}
+
+rule make-b-main-target
+{
+    local project = [ project.current ] ;
+    targets.main-target-alternative [ new test-target-class b : $(project) ] ;
+}
+
+exe a : a.cpp b c ;
+make-b-main-target ;
+alias c ;  # Expands to nothing, intentionally.
+""")
+
+t.run_build_system()
+
+# The second invocation should do nothing, and produce no warning. The previous
+# invocation might have printed executed actions and other things, so it is not
+# easy to check if a warning was issued or not.
+t.run_build_system(stdout="")
+
+t.run_build_system(["-sGENERATE_ONLY_UNUSABLE=1"], stdout="")
+
+# Check that even if main target generates nothing, its usage requirements are
+# still propagated to dependants.
+t.write("a.cpp", """\
+#ifndef FOO
+    #error We refuse to compile without FOO being defined!
+    We_refuse_to_compile_without_FOO_being_defined
+#endif
+int main() {}
+""")
+t.run_build_system(["-sGENERATE_NOTHING=1"])
+
+t.cleanup()