1 files changed, 33 insertions, 0 deletions
diff --git a/libbuild2/dynamic.hxx b/libbuild2/dynamic.hxx
new file mode 100644
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--- /dev/null
+++ b/libbuild2/dynamic.hxx
@@ -0,0 +1,33 @@
+// file      : libbuild2/dynamic.hxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_DYNAMIC_HXX
+#define LIBBUILD2_DYNAMIC_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/forward.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/action.hxx>
+#include <libbuild2/target.hxx>
+
+#include <libbuild2/export.hxx>
+
+// Additional functionality that is normally only useful for implementing
+// rules with dynamic dependencies.
+//
+namespace build2
+{
+  class LIBBUILD2_SYMEXPORT dyndep_rule
+  {
+  public:
+    // Update the target during the match phase. Return true if it has changed
+    // or if the passed timestamp is not timestamp_unknown and is older than
+    // the target.
+    //
+    static bool
+    update (tracer&, action, const target&, timestamp);
+  };
+}
+
+#endif // LIBBUILD2_DYNAMIC_HXX