cmGlobalXCodeGenerator: Save CMAKE_SYSTEM_NAME in member

Source/cmGlobalXCodeGenerator.cxx

@@ -271,6 +271,13 @@ std::string cmGlobalXCodeGenerator::FindXcodeBuildCommand()
   return makeProgram;
 }
 
+bool cmGlobalXCodeGenerator::SetSystemName(std::string const& s,
+                                           cmMakefile* mf)
+{
+  this->SystemName = s;
+  return this->cmGlobalGenerator::SetSystemName(s, mf);
+}
+
 bool cmGlobalXCodeGenerator::SetGeneratorToolset(std::string const& ts,
                                                  bool build, cmMakefile* mf)
 {

Source/cmGlobalXCodeGenerator.h

@@ -109,6 +109,7 @@ public:
 
   bool ShouldStripResourcePath(cmMakefile*) const override;
 
+  bool SetSystemName(std::string const& s, cmMakefile* mf) override;
   bool SetGeneratorToolset(std::string const& ts, bool build,
                            cmMakefile* mf) override;
   void AppendFlag(std::string& flags, std::string const& flag) const;
@@ -298,6 +299,7 @@ private:
   std::vector<std::string> Architectures;
   std::string ObjectDirArchDefault;
   std::string ObjectDirArch;
+  std::string SystemName;
   std::string GeneratorToolset;
   std::map<cmGeneratorTarget const*, size_t> TargetOrderIndex;
 };