9 files changed, 71 insertions, 2 deletions
diff --git a/src/lib/corelib/buildgraph/rulenode.cpp b/src/lib/corelib/buildgraph/rulenode.cpp
index 032af9c37..efba23e68 100644
--- a/src/lib/corelib/buildgraph/rulenode.cpp
+++ b/src/lib/corelib/buildgraph/rulenode.cpp
@@ -67,7 +67,7 @@ void RuleNode::apply(const Logger &logger, const ArtifactSet &changedInputs,
 {
     bool hasAddedTags = false;
     bool hasRemovedTags = false;
-    result->upToDate = changedInputs.isEmpty();
+    result->upToDate = changedInputs.isEmpty() && !usedDependenciesAdded();
 
     ProductBuildData::ArtifactSetByFileTag relevantArtifacts;
     if (product->isMarkedForReapplication(m_rule)) {
@@ -141,5 +141,18 @@ void RuleNode::store(PersistentPool &pool) const
     pool.store(m_rule);
 }
 
+bool RuleNode::usedDependenciesAdded() const
+{
+    foreach (const ResolvedProductConstPtr &dep, product->dependencies) {
+        if (!dep->buildData || !dep->fileTags.matches(rule()->usings))
+            continue;
+        foreach (Artifact *a, dep->targetArtifacts()) {
+            if (a->fileTags.matches(rule()->usings) && a->product->isAdded(a))
+                return true;
+        }
+    }
+    return false;
+}
+
 } // namespace Internal
 } // namespace qbs
diff --git a/src/lib/corelib/buildgraph/rulenode.h b/src/lib/corelib/buildgraph/rulenode.h
index abf0a8e59..dce9a6381 100644
--- a/src/lib/corelib/buildgraph/rulenode.h
+++ b/src/lib/corelib/buildgraph/rulenode.h
@@ -65,6 +65,8 @@ protected:
     void store(PersistentPool &pool) const;
 
 private:
+    bool usedDependenciesAdded() const;
+
     RuleConstPtr m_rule;
 };
 
diff --git a/src/lib/corelib/buildgraph/rulesapplicator.cpp b/src/lib/corelib/buildgraph/rulesapplicator.cpp
index 497f2d30a..5633916a2 100644
--- a/src/lib/corelib/buildgraph/rulesapplicator.cpp
+++ b/src/lib/corelib/buildgraph/rulesapplicator.cpp
@@ -94,7 +94,7 @@ void RulesApplicator::applyRule(const RuleConstPtr &rule)
         }
     }
 
-    if (inputArtifacts.isEmpty())
+    if (inputArtifacts.isEmpty() && usingsArtifacts.isEmpty())
         return;
 
     if (rule->name == QLatin1String("QtCoreMocRule")) {
diff --git a/src/lib/corelib/language/language.cpp b/src/lib/corelib/language/language.cpp
index fce173f5f..379f2ea8e 100644
--- a/src/lib/corelib/language/language.cpp
+++ b/src/lib/corelib/language/language.cpp
@@ -746,6 +746,15 @@ const ArtifactSet ResolvedProduct::addedArtifactsByFileTag(const FileTag &tag) c
     return buildData->addedArtifactsByFileTag.value(tag);
 }
 
+bool ResolvedProduct::isAdded(Artifact *a) const
+{
+    foreach (const ArtifactSet &artifacts, buildData->addedArtifactsByFileTag) {
+        if (artifacts.contains(a))
+            return true;
+    }
+    return false;
+}
+
 const ArtifactSet ResolvedProduct::removedArtifactsByFileTag(const FileTag &tag) const
 {
     return buildData->removedArtifactsByFileTag.value(tag);
diff --git a/src/lib/corelib/language/language.h b/src/lib/corelib/language/language.h
index 70d7fb9ea..fdfb7e44e 100644
--- a/src/lib/corelib/language/language.h
+++ b/src/lib/corelib/language/language.h
@@ -389,6 +389,7 @@ public:
     void unregisterArtifactWithChangedInputs(Artifact *artifact);
     void unmarkForReapplication(const RuleConstPtr &rule);
     const ArtifactSet addedArtifactsByFileTag(const FileTag &tag) const;
+    bool isAdded(Artifact *a) const;
     const ArtifactSet removedArtifactsByFileTag(const FileTag &tag) const;
     bool isMarkedForReapplication(const RuleConstPtr &rule) const;
     ArtifactSet lookupArtifactsByFileTag(const FileTag &tag) const;
diff --git a/tests/auto/blackbox/testdata/appWithoutSources/a.cpp b/tests/auto/blackbox/testdata/appWithoutSources/a.cpp
new file mode 100644
index 000000000..bf7759e11
--- /dev/null
+++ b/tests/auto/blackbox/testdata/appWithoutSources/a.cpp
@@ -0,0 +1 @@
+int foo() { return 42; }
diff --git a/tests/auto/blackbox/testdata/appWithoutSources/b.cpp b/tests/auto/blackbox/testdata/appWithoutSources/b.cpp
new file mode 100644
index 000000000..76c93685d
--- /dev/null
+++ b/tests/auto/blackbox/testdata/appWithoutSources/b.cpp
@@ -0,0 +1,10 @@
+#include <cstdio>
+
+int foo();  // defined in a.cpp
+
+int main()
+{
+    printf("The answer is %d.\n", foo());
+    return 0;
+}
+
diff --git a/tests/auto/blackbox/testdata/appWithoutSources/project.qbs b/tests/auto/blackbox/testdata/appWithoutSources/project.qbs
new file mode 100644
index 000000000..983cc9bab
--- /dev/null
+++ b/tests/auto/blackbox/testdata/appWithoutSources/project.qbs
@@ -0,0 +1,30 @@
+import qbs 1.0
+
+Project {
+    StaticLibrary {
+        name: "a"
+
+        Depends { name: "cpp" }
+
+        files: [
+            "a.cpp",
+        ]
+    }
+
+    StaticLibrary {
+        name: "b"
+
+        Depends { name: "a" }
+        Depends { name: "cpp" }
+
+        files: [
+            "b.cpp",
+        ]
+    }
+
+    CppApplication {
+        name: "appWithoutSources"
+        Depends { name: "a" }
+        Depends { name: "b" }
+    }
+}
diff --git a/tests/auto/blackbox/tst_blackbox.cpp b/tests/auto/blackbox/tst_blackbox.cpp
index 2d7d9e5aa..86895c114 100644
--- a/tests/auto/blackbox/tst_blackbox.cpp
+++ b/tests/auto/blackbox/tst_blackbox.cpp
@@ -324,6 +324,9 @@ void TestBlackbox::build_project_data()
     QTest::newRow("simple probes")
             << QString("simpleProbe")
             << executableFilePath("MyApp");
+    QTest::newRow("application without sources")
+            << QString("appWithoutSources")
+            << executableFilePath("appWithoutSources");
 }
 
 void TestBlackbox::build_project()