Ninja: also consider rule command length for rsp file

Source/cmGlobalNinjaGenerator.cxx

@@ -557,6 +557,8 @@ void cmGlobalNinjaGenerator::AddRule(const std::string& name,
                                     rspfile,
                                     restat,
                                     generator);
+
+  this->RuleCmdLength[name] = command.size();
 }
 
 bool cmGlobalNinjaGenerator::HasRule(const std::string &name)

Source/cmGlobalNinjaGenerator.h

@@ -319,6 +319,8 @@ private:
 
   std::string ninjaCmd() const;
 
+  int GetRuleCmdLength(const std::string& name) { return RuleCmdLength[name]; }
+
 private:
   /// The file containing the build statement. (the relation ship of the
   /// compilation DAG).
@@ -335,6 +337,9 @@ private:
   /// The set of rules added to the generated build system.
   RulesSetType Rules;
 
+  /// Length of rule command, used by rsp file evaluation
+  std::map<std::string, int> RuleCmdLength;
+
   /// The set of dependencies to add to the "all" target.
   cmNinjaDeps AllDependencies;
 

Source/cmNinjaNormalTargetGenerator.cxx

@@ -480,7 +480,8 @@ void cmNinjaNormalTargetGenerator::WriteLinkStatement()
 
   int cmdLineLimit;
 #ifdef _WIN32
-  cmdLineLimit = 8000;
+  cmdLineLimit = 8000 - this->GetGlobalGenerator()->
+                                 GetRuleCmdLength(this->LanguageLinkerRule());
 #else
   cmdLineLimit = -1; // TODO
 #endif