Define 'multiplicity' for cyclic dependencies

We create target property "LINK_INTERFACE_MULTIPLICITY" and a per-config
version "LINK_INTERFACE_MULTIPLICITY_<CONFIG>".  It sets the number of
times a linker should scan through a mutually dependent group of static
libraries.  The largest value of this property on any target in the
group is used.  This will help projects link even for extreme cases of
cyclic inter-target dependencies.

1 files changed, 6 insertions, 0 deletions

diff --git a/Source/cmTarget.h b/Source/cmTarget.h
index e0118fcdcb..7b8c2ba806 100644
--- a/Source/cmTarget.h
+++ b/Source/cmTarget.h
@@ -249,9 +249,15 @@ public:
     // Shared library dependencies needed for linking on some platforms.
     std::vector<std::string> SharedDeps;
 
+    // Number of repetitions of a strongly connected component of two
+    // or more static libraries.
+    int Multiplicity;
+
     // Libraries listed for other configurations.
     // Needed only for OLD behavior of CMP0003.
     std::vector<std::string> WrongConfigLibraries;
+
+    LinkInterface(): Multiplicity(0) {}
   };
 
   /** Get the link interface for the given configuration.  Returns 0