5 files changed, 46 insertions, 2 deletions
diff --git a/src/lib/corelib/tools/buildoptions.cpp b/src/lib/corelib/tools/buildoptions.cpp
index 2261124d8..a2d703363 100644
--- a/src/lib/corelib/tools/buildoptions.cpp
+++ b/src/lib/corelib/tools/buildoptions.cpp
@@ -42,6 +42,7 @@ public:
     }
 
     QStringList changedFiles;
+    QStringList filesToConsider;
     QStringList activeFileTags;
     int maxJobCount;
     bool dryRun;
@@ -98,6 +99,26 @@ void BuildOptions::setChangedFiles(const QStringList &changedFiles)
 }
 
 /*!
+ * \brief The list of files to consider.
+ * \sa setFilesToConsider.
+ * By default, this list is empty.
+ */
+QStringList BuildOptions::filesToConsider() const
+{
+    return d->filesToConsider;
+}
+
+/*!
+ * \brief If the given list is non-empty, qbs will run only commands whose rule has at least one
+ *        of these files as an input.
+ * \note The list elements must be absolute file paths.
+ */
+void BuildOptions::setFilesToConsider(const QStringList &files)
+{
+    d->filesToConsider = files;
+}
+
+/*!
  * \brief The list of active file tags.
  * \sa setActiveFileTags
  */
@@ -109,8 +130,8 @@ QStringList BuildOptions::activeFileTags() const
 /*!
  * \brief Set the list of active file tags.
  * If this list is non-empty, then every transformer with non-matching output file tags is skipped.
- * E.g. set changed files to "foo.cpp" and activeFileTags to ["obj"] to run the compiler
- * on foo.cpp without further processing like linking.
+ * E.g. call \c setFilesToConsider() with "foo.cpp" and \c setActiveFileTags() with "obj" to
+ * run the compiler on foo.cpp without further processing like linking.
  * \sa activeFileTags
  */
 void BuildOptions::setActiveFileTags(const QStringList &fileTags)
diff --git a/src/lib/corelib/tools/buildoptions.h b/src/lib/corelib/tools/buildoptions.h
index 2c277fc3b..c79e6477b 100644
--- a/src/lib/corelib/tools/buildoptions.h
+++ b/src/lib/corelib/tools/buildoptions.h
@@ -45,6 +45,9 @@ public:
     BuildOptions &operator=(const BuildOptions &other);
     ~BuildOptions();
 
+    QStringList filesToConsider() const;
+    void setFilesToConsider(const QStringList &files);
+
     QStringList changedFiles() const;
     void setChangedFiles(const QStringList &changedFiles);
 
diff --git a/src/lib/corelib/tools/filetime.h b/src/lib/corelib/tools/filetime.h
index 0dc0524df..0f16f3ad3 100644
--- a/src/lib/corelib/tools/filetime.h
+++ b/src/lib/corelib/tools/filetime.h
@@ -68,6 +68,7 @@ public:
     QString toString() const;
 
     static FileTime currentTime();
+    static FileTime oldestTime();
 
     friend class FileInfo;
     InternalType m_fileTime;
diff --git a/src/lib/corelib/tools/filetime_unix.cpp b/src/lib/corelib/tools/filetime_unix.cpp
index 945be8f44..5dd176c04 100644
--- a/src/lib/corelib/tools/filetime_unix.cpp
+++ b/src/lib/corelib/tools/filetime_unix.cpp
@@ -62,6 +62,11 @@ FileTime FileTime::currentTime()
     return time(0);
 }
 
+FileTime FileTime::oldestTime()
+{
+    return 1;
+}
+
 QString FileTime::toString() const
 {
     QDateTime dt;
diff --git a/src/lib/corelib/tools/filetime_win.cpp b/src/lib/corelib/tools/filetime_win.cpp
index b3a7fab67..706dd4752 100644
--- a/src/lib/corelib/tools/filetime_win.cpp
+++ b/src/lib/corelib/tools/filetime_win.cpp
@@ -75,6 +75,20 @@ FileTime FileTime::currentTime()
     return result;
 }
 
+FileTime FileTime::oldestTime()
+{
+    SYSTEMTIME st = {
+        1601,
+        1,
+        5,
+        2
+    };
+    FileTime result;
+    FILETIME *const ft = reinterpret_cast<FILETIME *>(&result.m_fileTime);
+    SystemTimeToFileTime(&st, ft);
+    return result;
+}
+
 QString FileTime::toString() const
 {
     const FILETIME *const ft = reinterpret_cast<const FILETIME *>(&m_fileTime);