fix up-to-date check wrt missing file dependencies

Missing file dependencies (e.g. header files that are not part of the
project) must trigger a rebuild their dependents.

Change-Id: I502e696d886c86a503e8950ae60254075f7e9415
Task-number: QBS-631
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>

6 files changed, 36 insertions, 0 deletions

diff --git a/src/lib/corelib/buildgraph/executor.cpp b/src/lib/corelib/buildgraph/executor.cpp
index 8371ffad9..f6066e6ec 100644
--- a/src/lib/corelib/buildgraph/executor.cpp
+++ b/src/lib/corelib/buildgraph/executor.cpp
@@ -348,6 +348,13 @@ bool Executor::isUpToDate(Artifact *artifact) const
         if (!fileDependency->timestamp().isValid()) {
             FileInfo fi(fileDependency->filePath());
             fileDependency->setTimestamp(fi.lastModified());
+            if (!fileDependency->timestamp().isValid()) {
+                if (m_doDebug) {
+                    m_logger.qbsDebug() << "[UTD] file dependency doesn't exist "
+                                        << fileDependency->filePath();
+                }
+                return false;
+            }
         }
         if (m_doDebug) {
             m_logger.qbsDebug() << "[UTD] file dependency timestamp "
diff --git a/tests/auto/blackbox/testdata/removeFileDependency/main.cpp b/tests/auto/blackbox/testdata/removeFileDependency/main.cpp
new file mode 100644
index 000000000..77727cf42
--- /dev/null
+++ b/tests/auto/blackbox/testdata/removeFileDependency/main.cpp
@@ -0,0 +1,9 @@
+#include "someheader.h"
+#include <cstdio>
+
+int main()
+{
+    printf("The magic value is %d.\n", magicValue());
+    return 0;
+}
+
diff --git a/tests/auto/blackbox/testdata/removeFileDependency/removeFileDependency.qbs b/tests/auto/blackbox/testdata/removeFileDependency/removeFileDependency.qbs
new file mode 100644
index 000000000..8ed927761
--- /dev/null
+++ b/tests/auto/blackbox/testdata/removeFileDependency/removeFileDependency.qbs
@@ -0,0 +1,7 @@
+import qbs
+
+CppApplication {
+    files: ["main.cpp"]
+    // Do not reference header files here to force them to be FileDependency objects.
+}
+
diff --git a/tests/auto/blackbox/testdata/removeFileDependency/someheader.h b/tests/auto/blackbox/testdata/removeFileDependency/someheader.h
new file mode 100644
index 000000000..b895e465c
--- /dev/null
+++ b/tests/auto/blackbox/testdata/removeFileDependency/someheader.h
@@ -0,0 +1 @@
+inline int magicValue() { return 156; }
diff --git a/tests/auto/blackbox/tst_blackbox.cpp b/tests/auto/blackbox/tst_blackbox.cpp
index 30cf99cd1..605582961 100644
--- a/tests/auto/blackbox/tst_blackbox.cpp
+++ b/tests/auto/blackbox/tst_blackbox.cpp
@@ -662,6 +662,17 @@ void TestBlackbox::rc()
     QCOMPARE(rcFileWasCompiled, HostOsInfo::isWindowsHost());
 }
 
+void TestBlackbox::removeFileDependency()
+{
+    QDir::setCurrent(testDataDir + "/removeFileDependency");
+    QCOMPARE(runQbs(), 0);
+    QFile::remove("someheader.h");
+    QbsRunParameters params;
+    params.expectFailure = true;
+    QVERIFY(runQbs(params) != 0);
+    QVERIFY(m_qbsStdout.contains("compiling main.cpp"));
+}
+
 void TestBlackbox::renameDependency()
 {
     QDir::setCurrent(testDataDir + "/renameDependency");
diff --git a/tests/auto/blackbox/tst_blackbox.h b/tests/auto/blackbox/tst_blackbox.h
index c975a9815..cf3ebb146 100644
--- a/tests/auto/blackbox/tst_blackbox.h
+++ b/tests/auto/blackbox/tst_blackbox.h
@@ -147,6 +147,7 @@ private slots:
     void exportWithRecursiveDepends();
     void fileTagger();
     void rc();
+    void removeFileDependency();
     void renameDependency();
     void renameProduct();
     void renameTargetArtifact();