2 files changed, 12 insertions, 3 deletions
diff --git a/src/libs/utils/buildablehelperlibrary.cpp b/src/libs/utils/buildablehelperlibrary.cpp
index 3bc6b6e449..809aab9b85 100644
--- a/src/libs/utils/buildablehelperlibrary.cpp
+++ b/src/libs/utils/buildablehelperlibrary.cpp
@@ -322,11 +322,19 @@ bool BuildableHelperLibrary::getHelperFileInfoFor(const QStringList &validBinary
     return false;
 }
 
-QString BuildableHelperLibrary::byInstallDataHelper(const QString &mainFilename,
+QString BuildableHelperLibrary::byInstallDataHelper(const QString &sourcePath,
+                                                    const QStringList &sourceFileNames,
                                                     const QStringList &installDirectories,
                                                     const QStringList &validBinaryFilenames)
 {
-    QDateTime sourcesModified = QFileInfo(mainFilename).lastModified();
+    // find the latest change to the sources
+    QDateTime sourcesModified;
+    foreach (const QString &sourceFileName, sourceFileNames) {
+        const QDateTime fileModified = QFileInfo(sourcePath + sourceFileName).lastModified();
+        if (fileModified.isValid() && (!sourcesModified.isValid() || fileModified > sourcesModified))
+            sourcesModified = fileModified;
+    }
+
     // We pretend that the lastmodified of gdbmacros.cpp is 5 minutes before what the file system says
     // Because afer a installation from the package the modified dates of gdbmacros.cpp
     // and the actual library are close to each other, but not deterministic in one direction
diff --git a/src/libs/utils/buildablehelperlibrary.h b/src/libs/utils/buildablehelperlibrary.h
index 5753eeccf0..1a8063541f 100644
--- a/src/libs/utils/buildablehelperlibrary.h
+++ b/src/libs/utils/buildablehelperlibrary.h
@@ -59,7 +59,8 @@ public:
     static QString qtInstallHeadersDir(const QString &qmakePath);
     static QString qtInstallDataDir(const QString &qmakePath);
 
-    static QString byInstallDataHelper(const QString &mainFilename,
+    static QString byInstallDataHelper(const QString &sourcePath,
+                                       const QStringList &sourceFileNames,
                                        const QStringList &installDirectories,
                                        const QStringList &validBinaryFilenames);