Add use of EFFECTIVE_PLATFORM_NAME to generated Xcode projects.

Facilitates building iOS projects, enabling switching back and forth
between simulator and device builds at development time.

Source/cmGlobalXCodeGenerator.cxx

@@ -1480,7 +1480,8 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
   BuildObjectListOrString ppDefs(this, this->XcodeVersion >= 30);
   if(this->XcodeVersion > 15)
     {
-    this->AppendDefines(ppDefs, "CMAKE_INTDIR=\"$(CONFIGURATION)\"");
+    this->AppendDefines(ppDefs,
+      "CMAKE_INTDIR=\"$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)\"");
     }
   if(const char* exportMacro = target.GetExportMacro())
     {
@@ -1597,9 +1598,12 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
     {
     if(this->XcodeVersion >= 21)
       {
-      std::string pncdir = target.GetDirectory(configName);
-      buildSettings->AddAttribute("CONFIGURATION_BUILD_DIR",
-                                  this->CreateString(pncdir.c_str()));
+      if(!target.UsesDefaultOutputDir(configName, false))
+        {
+        std::string pncdir = target.GetDirectory(configName);
+        buildSettings->AddAttribute("CONFIGURATION_BUILD_DIR",
+                                    this->CreateString(pncdir.c_str()));
+        }
       }
     else
       {
@@ -2399,10 +2403,10 @@ void cmGlobalXCodeGenerator
         {
         if(this->XcodeVersion > 15)
           {
-          // now add the same one but append $(CONFIGURATION) to it:
+          // now add the same one but append $(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME) to it:
           linkDirs += " ";
           linkDirs += this->XCodeEscapePath(
-            (*libDir + "/$(CONFIGURATION)").c_str());
+            (*libDir + "/$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)").c_str());
           }
         linkDirs += " ";
         linkDirs += this->XCodeEscapePath(libDir->c_str());
@@ -3173,7 +3177,8 @@ cmGlobalXCodeGenerator::WriteXCodePBXProj(std::ostream& fout,
 //----------------------------------------------------------------------------
 const char* cmGlobalXCodeGenerator::GetCMakeCFGInitDirectory()
 {
-  return this->XcodeVersion >= 21? "$(CONFIGURATION)" : ".";
+  return this->XcodeVersion >= 21 ?
+    "$(CONFIGURATION)$(EFFECTIVE_PLATFORM_NAME)" : ".";
 }
 
 //----------------------------------------------------------------------------

Source/cmTarget.cxx

@@ -3688,9 +3688,11 @@ const char* cmTarget::GetOutputTargetType(bool implib)
 }
 
 //----------------------------------------------------------------------------
-void cmTarget::ComputeOutputDir(const char* config,
+bool cmTarget::ComputeOutputDir(const char* config,
                                 bool implib, std::string& out)
 {
+  bool usesDefaultOutputDir = false;
+
   // Look for a target property defining the target output directory
   // based on the target type.
   std::string targetTypeName = this->GetOutputTargetType(implib);
@@ -3742,6 +3744,7 @@ void cmTarget::ComputeOutputDir(const char* config,
   if(out.empty())
     {
     // Default to the current output directory.
+    usesDefaultOutputDir = true;
     out = ".";
     }
 
@@ -3757,6 +3760,15 @@ void cmTarget::ComputeOutputDir(const char* config,
     this->Makefile->GetLocalGenerator()->GetGlobalGenerator()->
       AppendDirectoryForConfig("/", config, "", out);
     }
+
+  return usesDefaultOutputDir;
+}
+
+//----------------------------------------------------------------------------
+bool cmTarget::UsesDefaultOutputDir(const char* config, bool implib)
+{
+  std::string dir;
+  return this->ComputeOutputDir(config, implib, dir);
 }
 
 //----------------------------------------------------------------------------

Source/cmTarget.h

@@ -446,6 +446,10 @@ public:
   /** Get a build-tree directory in which to place target support files.  */
   std::string GetSupportDirectory() const;
 
+  /** Return whether this target uses the default value for its output
+      directory.  */
+  bool UsesDefaultOutputDir(const char* config, bool implib);
+
 private:
   /**
    * A list of direct dependencies. Use in conjunction with DependencyMap.
@@ -558,7 +562,7 @@ private:
   // Cache target output paths for each configuration.
   struct OutputInfo;
   OutputInfo const* GetOutputInfo(const char* config);
-  void ComputeOutputDir(const char* config, bool implib, std::string& out);
+  bool ComputeOutputDir(const char* config, bool implib, std::string& out);
 
   // Cache import information from properties for each configuration.
   struct ImportInfo;