ENH: Added a const version of GetLinkLibraries().

Source/cmMakefile.h

@@ -182,6 +182,14 @@ public:
     return m_LinkLibraries;
     }
 
+  /**
+   * Get a list of link libraries in the build.
+   */
+  const cmTarget::LinkLibraries& GetLinkLibraries() const
+    { 
+    return m_LinkLibraries;
+    }
+
   /**
    * Add a link library to the build.
    */