ENH: Implemented link-interface specification feature.

  - Shared libs and executables with exports may now have
    explicit transitive link dependencies specified
  - Created LINK_INTERFACE_LIBRARIES and related properties
  - Exported targets get the interface libraries as their
    IMPORTED_LINK_LIBRARIES property.
  - The export() and install(EXPORT) commands now give
    an error when a linked target is not included since
    the user can change the interface libraries instead
    of adding the target.

1 files changed, 24 insertions, 0 deletions

diff --git a/Source/cmTarget.h b/Source/cmTarget.h
index 37ab203..bbcdafc 100644
--- a/Source/cmTarget.h
+++ b/Source/cmTarget.h
@@ -35,6 +35,20 @@ struct cmTargetLinkInformationMap:
   ~cmTargetLinkInformationMap();
 };
 
+struct cmTargetLinkInterface: public std::vector<std::string>
+{
+  typedef std::vector<std::string> derived;
+};
+
+struct cmTargetLinkInterfaceMap:
+  public std::map<cmStdString, cmTargetLinkInterface*>
+{
+  typedef std::map<cmStdString, cmTargetLinkInterface*> derived;
+  cmTargetLinkInterfaceMap() {}
+  cmTargetLinkInterfaceMap(cmTargetLinkInterfaceMap const& r);
+  ~cmTargetLinkInterfaceMap();
+};
+
 /** \class cmTarget
  * \brief Represent a library or executable target loaded from a makefile.
  *
@@ -209,6 +223,12 @@ public:
   std::vector<std::string> const*
   GetImportedLinkLibraries(const char* config);
 
+  /** Get the library interface dependencies.  This is the set of
+      libraries from which something that links to this target may
+      also receive symbols.  Returns 0 if the user has not specified
+      such dependencies or for static libraries.  */
+  cmTargetLinkInterface const* GetLinkInterface(const char* config);
+
   /** Get the directory in which this target will be built.  If the
       configuration name is given then the generator will add its
       subdirectory for that configuration.  Otherwise just the canonical
@@ -476,6 +496,10 @@ private:
 
   cmTargetLinkInformationMap LinkInformation;
 
+  // Link interface.
+  cmTargetLinkInterface* ComputeLinkInterface(const char* config);
+  cmTargetLinkInterfaceMap LinkInterface;
+
   // The cmMakefile instance that owns this target.  This should
   // always be set.
   cmMakefile* Makefile;