ENH: Avoid computing link information for static library targets. They do not link.

Source/cmGlobalXCodeGenerator.cxx

@@ -2092,6 +2092,12 @@ void cmGlobalXCodeGenerator
       } 
     }
 
+  // Skip link information for static libraries.
+  if(cmtarget->GetType() == cmTarget::STATIC_LIBRARY)
+    {
+    return;
+    }
+
   // Loop over configuration types and set per-configuration info.
   for(std::vector<std::string>::iterator i =
         this->CurrentConfigurationTypes.begin();
@@ -2166,7 +2172,6 @@ void cmGlobalXCodeGenerator
     }
 
     // now add the link libraries
-    if(cmtarget->GetType() != cmTarget::STATIC_LIBRARY)
     {
     std::string linkLibs;
     const char* sep = "";

Source/cmMakefileLibraryTargetGenerator.cxx

@@ -720,7 +720,11 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
 
   // Collect up flags to link in needed libraries.
   cmOStringStream linklibs;
-  this->LocalGenerator->OutputLinkLibraries(linklibs, *this->Target, relink);
+  if(this->Target->GetType() != cmTarget::STATIC_LIBRARY)
+    {
+    this->LocalGenerator
+      ->OutputLinkLibraries(linklibs, *this->Target, relink);
+    }
 
   // Construct object file lists that may be needed to expand the
   // rule.

Source/cmTarget.cxx

@@ -3299,6 +3299,9 @@ cmTargetLinkInterface* cmTarget::ComputeLinkInterface(const char* config)
 cmComputeLinkInformation*
 cmTarget::GetLinkInformation(const char* config)
 {
+  // Link information does not make sense for static libraries.
+  assert(this->GetType() != cmTarget::STATIC_LIBRARY);
+
   // Lookup any existing information for this configuration.
   std::map<cmStdString, cmComputeLinkInformation*>::iterator
     i = this->LinkInformation.find(config?config:"");