ENH: Build large archives incrementally

Creation of archive libraries with the unix 'ar' tool should be done
incrementally when the number of object files is large.  This avoids
problems with the command line getting too many arguments.

Source/cmMakefileLibraryTargetGenerator.cxx

@@ -612,12 +612,15 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
   }
 
   // For static libraries there might be archiving rules.
+  bool haveStaticLibraryRule = false;
   std::vector<std::string> archiveCreateCommands;
   std::vector<std::string> archiveAppendCommands;
   std::vector<std::string> archiveFinishCommands;
   std::string::size_type archiveCommandLimit = std::string::npos;
   if(this->Target->GetType() == cmTarget::STATIC_LIBRARY)
     {
+    haveStaticLibraryRule =
+      this->Makefile->GetDefinition(linkRuleVar)? true:false;
     std::string arCreateVar = "CMAKE_";
     arCreateVar += linkLanguage;
     arCreateVar += "_ARCHIVE_CREATE";
@@ -643,6 +646,7 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
 
   // Decide whether to use archiving rules.
   bool useArchiveRules =
+    !haveStaticLibraryRule &&
     !archiveCreateCommands.empty() && !archiveAppendCommands.empty();
   if(useArchiveRules)
     {