Ninja: Honor CMAKE_NINJA_FORCE_RESPONSE_FILE for compile rules

Source/cmNinjaTargetGenerator.cxx

@@ -341,11 +341,25 @@ cmNinjaTargetGenerator
 
   cmMakefile* mf = this->GetMakefile();
 
+  std::string flags = "$FLAGS";
+  std::string rspfile;
+  std::string rspcontent;
+  std::string responseFlag;
+
+  if (this->ForceResponseFile())
+    {
+    rspfile = "$RSP_FILE";
+    responseFlag = "@" + rspfile;
+    rspcontent = " $DEFINES $INCLUDES $FLAGS";
+    flags = responseFlag;
+    vars.Defines = "";
+    vars.Includes = "";
+    }
+
   // Tell ninja dependency format so all deps can be loaded into a database
   std::string deptype;
   std::string depfile;
   std::string cldeps;
-  std::string flags = "$FLAGS";
   if (this->NeedDepTypeMSVC(lang))
     {
     deptype = "msvc";
@@ -460,8 +474,8 @@ cmNinjaTargetGenerator
                                       comment.str(),
                                       depfile,
                                       deptype,
-                                      /*rspfile*/ "",
+                                      rspfile,
-                                      /*rspcontent*/ "",
+                                      rspcontent,
                                       /*restat*/ "",
                                       /*generator*/ false);
 }
@@ -641,6 +655,9 @@ cmNinjaTargetGenerator
 
   this->SetMsvcTargetPdbVariable(vars);
 
+  int const commandLineLengthLimit = this->ForceResponseFile() ? -1 : 0;
+  std::string const rspfile = objectFileName + ".rsp";
+
   this->GetGlobalGenerator()->WriteBuild(this->GetBuildFileStream(),
                                          comment,
                                          rule,
@@ -648,7 +665,10 @@ cmNinjaTargetGenerator
                                          explicitDeps,
                                          implicitDeps,
                                          orderOnlyDeps,
-                                         vars);
+                                         vars,
+                                         rspfile,
+                                         commandLineLengthLimit);
+
 
   if(const char* objectOutputs = source->GetProperty("OBJECT_OUTPUTS")) {
     std::vector<std::string> outputList;