ENH: Generate native Xcode 3.0 and 3.1 projects

CMake previously generated Xcode project files labeled as 2.4-compatible
by recent versions of Xcode (3.0 and 3.1).  It is better to generate
native Xcode 3.0 and 3.1 projects.  In particular, this can improve
build times by using the "Build independent targets in parallel"
feature.

Patch from Doug Gregor.  See issue #9216.

1 files changed, 113 insertions, 29 deletions

diff --git a/Source/cmGlobalXCodeGenerator.cxx b/Source/cmGlobalXCodeGenerator.cxx
index 3fd14a9..996d961 100644
--- a/Source/cmGlobalXCodeGenerator.cxx
+++ b/Source/cmGlobalXCodeGenerator.cxx
@@ -451,6 +451,57 @@ cmStdString GetGroupMapKey(cmTarget& cmtarget, cmSourceFile* sf)
   return key;
 }
 
+// Builds either an object list or a space-separated string from the
+// given inputs.
+class cmGlobalXCodeGenerator::BuildObjectListOrString
+{
+  cmGlobalXCodeGenerator *Generator;
+  cmXCodeObject *Group;
+  bool Empty;
+  std::string String;
+
+public:
+  BuildObjectListOrString(cmGlobalXCodeGenerator *gen, bool buildObjectList)
+    : Generator(gen), Group(0), Empty(true)
+    {
+    if (buildObjectList)
+      {
+      this->Group = this->Generator->CreateObject(cmXCodeObject::OBJECT_LIST);
+      }
+    }
+
+  bool IsEmpty() const { return this->Empty; }
+
+  void Add(const char *newString)
+    {
+    this->Empty = false;
+
+    if (this->Group)
+      {
+      this->Group->AddObject(this->Generator->CreateString(newString));
+      }
+    else
+      {
+      this->String += newString;
+      this->String += ' ';
+      }
+    }
+
+  const std::string &GetString() const { return this->String; }
+
+  cmXCodeObject *CreateList()
+    {
+    if (this->Group)
+      {
+      return this->Group;
+      }
+    else
+      {
+      return this->Generator->CreateString(this->String.c_str());
+      }
+    }
+};
+
 //----------------------------------------------------------------------------
 cmXCodeObject*
 cmGlobalXCodeGenerator::CreateXCodeSourceFile(cmLocalGenerator* lg,
@@ -466,7 +517,17 @@ cmGlobalXCodeGenerator::CreateXCodeSourceFile(cmLocalGenerator* lg,
   lg->AppendFlags(flags, sf->GetProperty("COMPILE_FLAGS"));
 
   // Add per-source definitions.
-  this->AppendDefines(flags, sf->GetProperty("COMPILE_DEFINITIONS"), true);
+  BuildObjectListOrString flagsBuild(this, false);
+  this->AppendDefines(flagsBuild,
+                      sf->GetProperty("COMPILE_DEFINITIONS"), true);
+  if (!flagsBuild.IsEmpty())
+    {
+    if (flags.size())
+      {
+      flags += ' ';
+      }
+    flags += flagsBuild.GetString();
+    }
 
   // Using a map and the full path guarantees that we will always get the same
   // fileRef object for any given full path.
@@ -1348,7 +1409,7 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
                 this->CurrentMakefile->GetDefineFlags());
 
   // Add preprocessor definitions for this target and configuration.
-  std::string ppDefs;
+  BuildObjectListOrString ppDefs(this, this->XcodeVersion >= 30);
   if(this->XcodeVersion > 15)
     {
     this->AppendDefines(ppDefs, "CMAKE_INTDIR=\"$(CONFIGURATION)\"");
@@ -1370,7 +1431,7 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
     this->AppendDefines(ppDefs, target.GetProperty(defVarName.c_str()));
     }
   buildSettings->AddAttribute
-    ("GCC_PREPROCESSOR_DEFINITIONS", this->CreateString(ppDefs.c_str()));
+    ("GCC_PREPROCESSOR_DEFINITIONS", ppDefs.CreateList());
 
   std::string extraLinkOptions;
   if(target.GetType() == cmTarget::EXECUTABLE)
@@ -1563,10 +1624,11 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
     buildSettings->AddAttribute("PREBINDING", 
                                 this->CreateString("NO"));
     }
-  std::string dirs;
+
+  BuildObjectListOrString dirs(this, this->XcodeVersion >= 30);
+  BuildObjectListOrString fdirs(this, this->XcodeVersion >= 30);
   std::vector<std::string> includes;
   this->CurrentLocalGenerator->GetIncludeDirectories(includes);
-  std::string fdirs;
   std::set<cmStdString> emitted;
   emitted.insert("/System/Library/Frameworks");
   for(std::vector<std::string>::iterator i = includes.begin();
@@ -1579,15 +1641,14 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
       frameworkDir = cmSystemTools::CollapseFullPath(frameworkDir.c_str());
       if(emitted.insert(frameworkDir).second)
         {
-        fdirs += this->XCodeEscapePath(frameworkDir.c_str());
-        fdirs += " ";
+        fdirs.Add(this->XCodeEscapePath(frameworkDir.c_str()).c_str());
         }
       }
     else
       {
       std::string incpath = 
         this->XCodeEscapePath(i->c_str());
-      dirs += incpath + " ";
+      dirs.Add(incpath.c_str());
       }
     }
   std::vector<std::string>& frameworks = target.GetFrameworks();
@@ -1598,20 +1659,19 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
       {
       if(emitted.insert(*fmIt).second)
         {
-        fdirs += this->XCodeEscapePath(fmIt->c_str());
-        fdirs += " ";
+        fdirs.Add(this->XCodeEscapePath(fmIt->c_str()).c_str());
         }
       }
     }
-  if(fdirs.size())
+  if(!fdirs.IsEmpty())
     {
     buildSettings->AddAttribute("FRAMEWORK_SEARCH_PATHS", 
-                                this->CreateString(fdirs.c_str()));
+                                fdirs.CreateList());
     }
-  if(dirs.size())
+  if(!dirs.IsEmpty())
     {
     buildSettings->AddAttribute("HEADER_SEARCH_PATHS", 
-                                this->CreateString(dirs.c_str()));
+                                dirs.CreateList());
     }
   std::string oflagc = this->ExtractFlag("-O", cflags);
   char optLevel[2];
@@ -1714,10 +1774,21 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
                               this->CreateString(""));
   buildSettings->AddAttribute("USE_HEADERMAP",
                               this->CreateString("NO"));
-  buildSettings->AddAttribute("WARNING_CFLAGS",
-                              this->CreateString(
-                                "-Wmost -Wno-four-char-constants"
-                                " -Wno-unknown-pragmas"));
+  if (this->XcodeVersion >= 30)
+    {
+    cmXCodeObject *group = this->CreateObject(cmXCodeObject::OBJECT_LIST);
+    group->AddObject(this->CreateString("-Wmost"));
+    group->AddObject(this->CreateString("-Wno-four-char-constants"));
+    group->AddObject(this->CreateString("-Wno-unknown-pragmas"));
+    buildSettings->AddAttribute("WARNING_CFLAGS", group);
+    }
+  else
+    {
+    buildSettings->AddAttribute("WARNING_CFLAGS",
+                                this->CreateString(
+                                  "-Wmost -Wno-four-char-constants"
+                                  " -Wno-unknown-pragmas"));
+    }
 
   // Runtime version information.
   if(target.GetType() == cmTarget::SHARED_LIBRARY)
@@ -2432,6 +2503,20 @@ void cmGlobalXCodeGenerator
   this->RootObject->AddAttribute("buildStyles", listObjs);
   this->RootObject->AddAttribute("hasScannedForEncodings",
                              this->CreateString("0"));
+  if (this->XcodeVersion >= 30)
+    {
+    group = this->CreateObject(cmXCodeObject::ATTRIBUTE_GROUP);
+    group->AddAttribute("BuildIndependentTargetsInParallel",
+                        this->CreateString("YES"));
+    this->RootObject->AddAttribute("attributes", group);
+    if (this->XcodeVersion >= 31)
+      this->RootObject->AddAttribute("compatibilityVersion",
+                                     this->CreateString("Xcode 3.1"));
+    else
+      this->RootObject->AddAttribute("compatibilityVersion",
+                                     this->CreateString("Xcode 3.0"));
+    this->RootObject->AddAttribute("projectDirPath", this->CreateString(""));
+    }
   // Point Xcode at the top of the source tree.
   {
   std::string proot = root->GetMakefile()->GetCurrentDirectory();
@@ -2946,7 +3031,7 @@ std::string cmGlobalXCodeGenerator::LookupFlags(const char* varNamePrefix,
 }
 
 //----------------------------------------------------------------------------
-void cmGlobalXCodeGenerator::AppendDefines(std::string& defs,
+void cmGlobalXCodeGenerator::AppendDefines(BuildObjectListOrString& defs,
                                            const char* defines_list,
                                            bool dflag)
 {
@@ -2967,21 +3052,18 @@ void cmGlobalXCodeGenerator::AppendDefines(std::string& defs,
   //   - Escape a backslash as \\\\ since it itself is an escape
   // Note that in the code below we need one more level of escapes for
   // C string syntax in this source file.
-  const char* sep = defs.empty()? "" : " ";
   for(std::vector<std::string>::const_iterator di = defines.begin();
       di != defines.end(); ++di)
     {
-    // Separate from previous definition.
-    defs += sep;
-    sep = " ";
+    std::string def;
 
     // Open single quote.
-    defs += "'";
+    def += "'";
 
     // Add -D flag if requested.
     if(dflag)
       {
-      defs += "-D";
+      def += "-D";
       }
 
     // Escaped definition string.
@@ -2989,20 +3071,22 @@ void cmGlobalXCodeGenerator::AppendDefines(std::string& defs,
       {
       if(*c == '\'')
         {
-        defs += "\\\\'";
+        def += "\\\\'";
         }
       else if(*c == '\\')
         {
-        defs += "\\\\\\\\";
+        def += "\\\\\\\\";
         }
       else
         {
-        defs += *c;
+        def += *c;
         }
       }
 
     // Close single quote.
-    defs += "'";
+    def += "'";
+
+    defs.Add(def.c_str());
     }
 }