Merge branch 'xcode-object-library' into object-library

* xcode-object-library:
  Xcode: Honor $<TARGET_OBJECTS:...> source expressions
  Build object library targets in Xcode
  Pre-compute object file names before Xcode generation
  Allow txt files as ExtraSources in object library targets
  Add a default source group for object files.
  Xcode: Re-factor some existing methods into "FromPath" variants
  Xcode: Re-factor code into GetObjectsNormalDirectory method

4 files changed, 284 insertions, 66 deletions

diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index c9911a5..4529d1c 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -75,7 +75,10 @@ void cmGeneratorTarget::ClassifySources()
     else
       {
       this->ExtraSources.push_back(sf);
-      if(isObjLib) { badObjLib.push_back(sf); }
+      if(isObjLib && cmSystemTools::LowerCase(sf->GetExtension()) != "txt")
+        {
+        badObjLib.push_back(sf);
+        }
       }
     }
 
diff --git a/Source/cmGlobalXCodeGenerator.cxx b/Source/cmGlobalXCodeGenerator.cxx
index a6a9200..f17a50d 100644
--- a/Source/cmGlobalXCodeGenerator.cxx
+++ b/Source/cmGlobalXCodeGenerator.cxx
@@ -19,6 +19,7 @@
 #include "cmComputeLinkInformation.h"
 #include "cmSourceFile.h"
 #include "cmCustomCommandGenerator.h"
+#include "cmGeneratorTarget.h"
 
 #include <cmsys/auto_ptr.hxx>
 
@@ -294,6 +295,10 @@ void cmGlobalXCodeGenerator::Generate()
     }
   this->ForceLinkerLanguages();
   this->cmGlobalGenerator::Generate();
+  if(cmSystemTools::GetErrorOccuredFlag())
+    {
+    return;
+    }
   for(it = this->ProjectMap.begin(); it!= this->ProjectMap.end(); ++it)
     {
     cmLocalGenerator* root = it->second[0];
@@ -408,6 +413,8 @@ cmGlobalXCodeGenerator::AddExtraTargets(cmLocalGenerator* root,
       // this will make sure that when the next target is built
       // things are up-to-date
       if((target.GetType() == cmTarget::EXECUTABLE ||
+// Nope - no post-build for OBJECT_LIRBRARY
+//          target.GetType() == cmTarget::OBJECT_LIBRARY ||
           target.GetType() == cmTarget::STATIC_LIBRARY ||
           target.GetType() == cmTarget::SHARED_LIBRARY ||
           target.GetType() == cmTarget::MODULE_LIBRARY))
@@ -561,15 +568,43 @@ cmXCodeObject* cmGlobalXCodeGenerator
 }
 
 //----------------------------------------------------------------------------
-cmStdString GetGroupMapKey(cmTarget& cmtarget, cmSourceFile* sf)
+cmStdString
+GetGroupMapKeyFromPath(cmTarget& cmtarget, const std::string& fullpath)
 {
   cmStdString key(cmtarget.GetName());
   key += "-";
-  key += sf->GetFullPath();
+  key += fullpath;
   return key;
 }
 
 //----------------------------------------------------------------------------
+cmStdString
+GetGroupMapKey(cmTarget& cmtarget, cmSourceFile* sf)
+{
+  return GetGroupMapKeyFromPath(cmtarget, sf->GetFullPath());
+}
+
+//----------------------------------------------------------------------------
+cmXCodeObject*
+cmGlobalXCodeGenerator::CreateXCodeSourceFileFromPath(
+  const std::string &fullpath,
+  cmTarget& cmtarget,
+  const std::string &lang)
+{
+  // Using a map and the full path guarantees that we will always get the same
+  // fileRef object for any given full path.
+  //
+  cmXCodeObject* fileRef =
+    this->CreateXCodeFileReferenceFromPath(fullpath, cmtarget, lang);
+
+  cmXCodeObject* buildFile = this->CreateObject(cmXCodeObject::PBXBuildFile);
+  buildFile->SetComment(fileRef->GetComment());
+  buildFile->AddAttribute("fileRef", this->CreateObjectReference(fileRef));
+
+  return buildFile;
+}
+
+//----------------------------------------------------------------------------
 cmXCodeObject*
 cmGlobalXCodeGenerator::CreateXCodeSourceFile(cmLocalGenerator* lg,
                                               cmSourceFile* sf,
@@ -603,14 +638,16 @@ cmGlobalXCodeGenerator::CreateXCodeSourceFile(cmLocalGenerator* lg,
     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.
-  //
-  cmXCodeObject* fileRef = this->CreateXCodeFileReference(sf, cmtarget);
+  const char* lang =
+    this->CurrentLocalGenerator->GetSourceFileLanguage(*sf);
+  if (!lang)
+    {
+    lang = "";
+    }
 
-  cmXCodeObject* buildFile = this->CreateObject(cmXCodeObject::PBXBuildFile);
-  buildFile->SetComment(fileRef->GetComment());
-  buildFile->AddAttribute("fileRef", this->CreateObjectReference(fileRef));
+  cmXCodeObject* buildFile =
+    this->CreateXCodeSourceFileFromPath(sf->GetFullPath(), cmtarget, lang);
+  cmXCodeObject* fileRef = buildFile->GetObject("fileRef")->GetObject();
 
   cmXCodeObject* settings =
     this->CreateObject(cmXCodeObject::ATTRIBUTE_GROUP);
@@ -662,36 +699,12 @@ cmGlobalXCodeGenerator::CreateXCodeSourceFile(cmLocalGenerator* lg,
 }
 
 //----------------------------------------------------------------------------
-cmXCodeObject*
-cmGlobalXCodeGenerator::CreateXCodeFileReference(cmSourceFile* sf,
-                                                 cmTarget& cmtarget)
+std::string
+GetSourcecodeValueFromFileExtension(const std::string& _ext,
+                                    const std::string& lang)
 {
-  std::string fname = sf->GetFullPath();
-  cmXCodeObject* fileRef = this->FileRefs[fname];
-  if(!fileRef)
-    {
-    fileRef = this->CreateObject(cmXCodeObject::PBXFileReference);
-    std::string comment = fname;
-    //comment += " in ";
-    //std::string gname = group->GetObject("name")->GetString();
-    //comment += gname.substr(1, gname.size()-2);
-    fileRef->SetComment(fname.c_str());
-    this->FileRefs[fname] = fileRef;
-    }
-  cmStdString key = GetGroupMapKey(cmtarget, sf);
-  cmXCodeObject* group = this->GroupMap[key];
-  cmXCodeObject* children = group->GetObject("children");
-  if (!children->HasObject(fileRef))
-    {
-    children->AddObject(fileRef);
-    }
-  fileRef->AddAttribute("fileEncoding", this->CreateString("4"));
-
-  const char* lang =
-    this->CurrentLocalGenerator->GetSourceFileLanguage(*sf);
+  std::string ext = cmSystemTools::LowerCase(_ext);
   std::string sourcecode = "sourcecode";
-  std::string ext = sf->GetExtension();
-  ext = cmSystemTools::LowerCase(ext);
 
   if(ext == "o")
     {
@@ -726,25 +739,25 @@ cmGlobalXCodeGenerator::CreateXCodeFileReference(cmSourceFile* sf,
     {
     sourcecode += ".cpp.h";
     }
-  else if(lang && strcmp(lang, "CXX") == 0)
+  else if(ext == "png" || ext == "gif" || ext == "jpg")
     {
-    sourcecode += ".cpp.cpp";
+    sourcecode = "image";
     }
-  else if(lang && strcmp(lang, "C") == 0)
+  else if(ext == "txt")
     {
-    sourcecode += ".c.c";
+    sourcecode += ".text";
     }
-  else if(lang && strcmp(lang, "Fortran") == 0)
+  else if(lang == "CXX")
     {
-    sourcecode += ".fortran.f90";
+    sourcecode += ".cpp.cpp";
     }
-  else if(ext == "png" || ext == "gif" || ext == "jpg")
+  else if(lang == "C")
     {
-    sourcecode = "image";
+    sourcecode += ".c.c";
     }
-  else if(ext == "txt")
+  else if(lang == "Fortran")
     {
-    sourcecode += ".text";
+    sourcecode += ".fortran.f90";
     }
   //else
   //  {
@@ -754,11 +767,51 @@ cmGlobalXCodeGenerator::CreateXCodeFileReference(cmSourceFile* sf,
   //  // valid lastKnownFileType value.
   //  }
 
+  return sourcecode;
+}
+
+//----------------------------------------------------------------------------
+cmXCodeObject*
+cmGlobalXCodeGenerator::CreateXCodeFileReferenceFromPath(
+  const std::string &fullpath,
+  cmTarget& cmtarget,
+  const std::string &lang)
+{
+  std::string fname = fullpath;
+  cmXCodeObject* fileRef = this->FileRefs[fname];
+  if(!fileRef)
+    {
+    fileRef = this->CreateObject(cmXCodeObject::PBXFileReference);
+    std::string comment = fname;
+    fileRef->SetComment(fname.c_str());
+    this->FileRefs[fname] = fileRef;
+    }
+  cmStdString key = GetGroupMapKeyFromPath(cmtarget, fullpath);
+  cmXCodeObject* group = this->GroupMap[key];
+  cmXCodeObject* children = group->GetObject("children");
+  if (!children->HasObject(fileRef))
+    {
+    children->AddObject(fileRef);
+    }
+  fileRef->AddAttribute("fileEncoding", this->CreateString("4"));
+
+  // Compute the extension.
+  std::string ext;
+  std::string realExt =
+    cmSystemTools::GetFilenameLastExtension(fullpath);
+  if(!realExt.empty())
+    {
+    // Extension without the leading '.'.
+    ext = realExt.substr(1);
+    }
+
+  std::string sourcecode = GetSourcecodeValueFromFileExtension(ext, lang);
+
   fileRef->AddAttribute("lastKnownFileType",
                         this->CreateString(sourcecode.c_str()));
 
   // Store the file path relative to the top of the source tree.
-  std::string path = this->RelativeToSource(sf->GetFullPath().c_str());
+  std::string path = this->RelativeToSource(fullpath.c_str());
   std::string name = cmSystemTools::GetFilenameName(path.c_str());
   const char* sourceTree = (cmSystemTools::FileIsFullPath(path.c_str())?
                             "<absolute>" : "SOURCE_ROOT");
@@ -773,6 +826,22 @@ cmGlobalXCodeGenerator::CreateXCodeFileReference(cmSourceFile* sf,
 }
 
 //----------------------------------------------------------------------------
+cmXCodeObject*
+cmGlobalXCodeGenerator::CreateXCodeFileReference(cmSourceFile* sf,
+                                                 cmTarget& cmtarget)
+{
+  const char* lang =
+    this->CurrentLocalGenerator->GetSourceFileLanguage(*sf);
+  if (!lang)
+    {
+    lang = "";
+    }
+
+  return this->CreateXCodeFileReferenceFromPath(
+    sf->GetFullPath(), cmtarget, lang);
+}
+
+//----------------------------------------------------------------------------
 bool cmGlobalXCodeGenerator::SpecialTargetEmitted(std::string const& tname)
 {
   if(tname == "ALL_BUILD" || tname == "XCODE_DEPEND_HELPER" ||
@@ -880,6 +949,20 @@ cmGlobalXCodeGenerator::CreateXCodeTargets(cmLocalGenerator* gen,
         }
       }
 
+    // Add object library contents as external objects. (Equivalent to
+    // the externalObjFiles above, except each one is not a cmSourceFile
+    // within the target.)
+    std::vector<std::string> objs;
+    this->GetGeneratorTarget(&cmtarget)->UseObjectLibraries(objs);
+    for(std::vector<std::string>::const_iterator
+          oi = objs.begin(); oi != objs.end(); ++oi)
+      {
+      std::string obj = *oi;
+      cmXCodeObject* xsf =
+        this->CreateXCodeSourceFileFromPath(obj, cmtarget, "");
+      externalObjFiles.push_back(xsf);
+      }
+
     // some build phases only apply to bundles and/or frameworks
     bool isFrameworkTarget = cmtarget.IsFrameworkOnApple();
     bool isBundleTarget = cmtarget.GetPropertyAsBool("MACOSX_BUNDLE");
@@ -1485,7 +1568,8 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
   std::string defFlags;
   bool shared = ((target.GetType() == cmTarget::SHARED_LIBRARY) ||
                  (target.GetType() == cmTarget::MODULE_LIBRARY));
-  bool binary = ((target.GetType() == cmTarget::STATIC_LIBRARY) ||
+  bool binary = ((target.GetType() == cmTarget::OBJECT_LIBRARY) ||
+                 (target.GetType() == cmTarget::STATIC_LIBRARY) ||
                  (target.GetType() == cmTarget::EXECUTABLE) ||
                  shared);
 
@@ -1572,7 +1656,8 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
     }
 
   const char* linkFlagsProp = "LINK_FLAGS";
-  if(target.GetType() == cmTarget::STATIC_LIBRARY)
+  if(target.GetType() == cmTarget::OBJECT_LIBRARY ||
+     target.GetType() == cmTarget::STATIC_LIBRARY)
     {
     linkFlagsProp = "STATIC_LIBRARY_FLAGS";
     }
@@ -1626,11 +1711,8 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
   std::string pnprefix;
   std::string pnbase;
   std::string pnsuffix;
-  target.GetFullNameComponents(pnprefix, pnbase, pnsuffix, configName);
 
-  // Store the product name for all target types.
-  buildSettings->AddAttribute("PRODUCT_NAME",
-                              this->CreateString(pnbase.c_str()));
+  target.GetFullNameComponents(pnprefix, pnbase, pnsuffix, configName);
 
   // Set attributes to specify the proper name for the target.
   std::string pndir = this->CurrentMakefile->GetCurrentOutputDirectory();
@@ -1654,17 +1736,44 @@ void cmGlobalXCodeGenerator::CreateBuildSettings(cmTarget& target,
                                   this->CreateString(pndir.c_str()));
       pndir = target.GetDirectory(configName);
       }
+
     buildSettings->AddAttribute("EXECUTABLE_PREFIX",
                                 this->CreateString(pnprefix.c_str()));
     buildSettings->AddAttribute("EXECUTABLE_SUFFIX",
                                 this->CreateString(pnsuffix.c_str()));
     }
+  else if(target.GetType() == cmTarget::OBJECT_LIBRARY)
+    {
+    pnprefix = "lib";
+    pnbase = target.GetName();
+    pnsuffix = ".a";
+
+    if(this->XcodeVersion >= 21)
+      {
+      std::string pncdir = this->GetObjectsNormalDirectory(
+        this->CurrentProject, configName, &target);
+      buildSettings->AddAttribute("CONFIGURATION_BUILD_DIR",
+                                  this->CreateString(pncdir.c_str()));
+      }
+    else
+      {
+      buildSettings->AddAttribute("OBJROOT",
+                                  this->CreateString(pndir.c_str()));
+      pndir = this->GetObjectsNormalDirectory(
+        this->CurrentProject, configName, &target);
+      }
+    }
+
+  // Store the product name for all target types.
+  buildSettings->AddAttribute("PRODUCT_NAME",
+                              this->CreateString(pnbase.c_str()));
   buildSettings->AddAttribute("SYMROOT",
                               this->CreateString(pndir.c_str()));
 
   // Handle settings for each target type.
   switch(target.GetType())
     {
+    case cmTarget::OBJECT_LIBRARY:
     case cmTarget::STATIC_LIBRARY:
     {
     buildSettings->AddAttribute("LIBRARY_STYLE",
@@ -2168,6 +2277,7 @@ const char* cmGlobalXCodeGenerator::GetTargetFileType(cmTarget& cmtarget)
 {
   switch(cmtarget.GetType())
     {
+    case cmTarget::OBJECT_LIBRARY:
     case cmTarget::STATIC_LIBRARY:
       return "archive.ar";
     case cmTarget::MODULE_LIBRARY:
@@ -2191,6 +2301,7 @@ const char* cmGlobalXCodeGenerator::GetTargetProductType(cmTarget& cmtarget)
 {
   switch(cmtarget.GetType())
     {
+    case cmTarget::OBJECT_LIBRARY:
     case cmTarget::STATIC_LIBRARY:
       return "com.apple.product-type.library.static";
     case cmTarget::MODULE_LIBRARY:
@@ -2248,7 +2359,17 @@ cmGlobalXCodeGenerator::CreateXCodeTarget(cmTarget& cmtarget,
     {
     fileRef->AddAttribute("explicitFileType", this->CreateString(fileType));
     }
-  std::string fullName = cmtarget.GetFullName(defConfig.c_str());
+  std::string fullName;
+  if(cmtarget.GetType() == cmTarget::OBJECT_LIBRARY)
+    {
+    fullName = "lib";
+    fullName += cmtarget.GetName();
+    fullName += ".a";
+    }
+  else
+    {
+    fullName = cmtarget.GetFullName(defConfig.c_str());
+    }
   fileRef->AddAttribute("path", this->CreateString(fullName.c_str()));
   fileRef->AddAttribute("refType", this->CreateString("0"));
   fileRef->AddAttribute("sourceTree",
@@ -2453,7 +2574,8 @@ void cmGlobalXCodeGenerator
     }
 
   // Skip link information for static libraries.
-  if(cmtarget->GetType() == cmTarget::STATIC_LIBRARY)
+  if(cmtarget->GetType() == cmTarget::OBJECT_LIBRARY ||
+     cmtarget->GetType() == cmTarget::STATIC_LIBRARY)
     {
     return;
     }
@@ -2601,6 +2723,7 @@ void cmGlobalXCodeGenerator::CreateGroups(cmLocalGenerator* root,
 
       std::vector<cmSourceFile*>  classes = cmtarget.GetSourceFiles();
 
+      // Put cmSourceFile instances in proper groups:
       for(std::vector<cmSourceFile*>::const_iterator s = classes.begin();
           s != classes.end(); s++)
         {
@@ -2614,6 +2737,21 @@ void cmGlobalXCodeGenerator::CreateGroups(cmLocalGenerator* root,
         cmStdString key = GetGroupMapKey(cmtarget, sf);
         this->GroupMap[key] = pbxgroup;
         }
+
+      // Put OBJECT_LIBRARY objects in proper groups:
+      std::vector<std::string> objs;
+      this->GetGeneratorTarget(&cmtarget)->UseObjectLibraries(objs);
+      for(std::vector<std::string>::const_iterator
+            oi = objs.begin(); oi != objs.end(); ++oi)
+        {
+        std::string const& source = *oi;
+        cmSourceGroup& sourceGroup =
+          mf->FindSourceGroup(source.c_str(), sourceGroups);
+        cmXCodeObject* pbxgroup =
+          this->CreateOrGetPBXGroup(cmtarget, &sourceGroup);
+        cmStdString key = GetGroupMapKeyFromPath(cmtarget, source);
+        this->GroupMap[key] = pbxgroup;
+        }
       }
     }
 }
@@ -3046,6 +3184,26 @@ void cmGlobalXCodeGenerator
 }
 
 //----------------------------------------------------------------------------
+std::string
+cmGlobalXCodeGenerator::GetObjectsNormalDirectory(
+  const std::string &projName,
+  const std::string &configName,
+  const cmTarget *t) const
+{
+  std::string dir =
+    t->GetMakefile()->GetCurrentOutputDirectory();
+  dir += "/";
+  dir += projName;
+  dir += ".build/";
+  dir += configName;
+  dir += "/";
+  dir += t->GetName();
+  dir += ".build/Objects-normal/";
+
+  return dir;
+}
+
+//----------------------------------------------------------------------------
 void
 cmGlobalXCodeGenerator::CreateXCodeDependHackTarget(
   std::vector<cmXCodeObject*>& targets)
@@ -3114,6 +3272,8 @@ cmGlobalXCodeGenerator::CreateXCodeDependHackTarget(
       cmTarget* t =target->GetTarget();
 
       if(t->GetType() == cmTarget::EXECUTABLE ||
+// Nope - no post-build for OBJECT_LIRBRARY
+//         t->GetType() == cmTarget::OBJECT_LIBRARY ||
          t->GetType() == cmTarget::STATIC_LIBRARY ||
          t->GetType() == cmTarget::SHARED_LIBRARY ||
          t->GetType() == cmTarget::MODULE_LIBRARY)
@@ -3169,15 +3329,8 @@ cmGlobalXCodeGenerator::CreateXCodeDependHackTarget(
         // then remove those exectuables as well
         if(this->Architectures.size() > 1)
           {
-          std::string universal =
-            t->GetMakefile()->GetCurrentOutputDirectory();
-          universal += "/";
-          universal += this->CurrentProject;
-          universal += ".build/";
-          universal += configName;
-          universal += "/";
-          universal += t->GetName();
-          universal += ".build/Objects-normal/";
+          std::string universal = this->GetObjectsNormalDirectory(
+            this->CurrentProject, configName, t);
           for( std::vector<std::string>::iterator arch =
                  this->Architectures.begin();
                arch != this->Architectures.end(); ++arch)
@@ -3536,3 +3689,51 @@ bool cmGlobalXCodeGenerator::IsMultiConfig()
   // Newer Xcode versions are multi config:
   return true;
 }
+
+ //----------------------------------------------------------------------------
+void
+cmGlobalXCodeGenerator
+::ComputeTargetObjects(cmGeneratorTarget* gt) const
+{
+  // Count the number of object files with each name. Warn about duplicate
+  // names since Xcode names them uniquely automatically with a numeric suffix
+  // to avoid exact duplicate file names. Note that Mac file names are not
+  // typically case sensitive, hence the LowerCase.
+  std::map<cmStdString, int> counts;
+  for(std::vector<cmSourceFile*>::const_iterator
+      si = gt->ObjectSources.begin();
+      si != gt->ObjectSources.end(); ++si)
+    {
+    cmSourceFile* sf = *si;
+    std::string objectName =
+      cmSystemTools::GetFilenameWithoutLastExtension(sf->GetFullPath());
+    objectName += ".o";
+
+    std::string objectNameLower = cmSystemTools::LowerCase(objectName);
+    counts[objectNameLower] += 1;
+    if (2 == counts[objectNameLower])
+      {
+      // TODO: emit warning about duplicate name?
+      }
+
+    gt->Objects[sf] = objectName;
+    }
+
+  const char* configName = this->GetCMakeCFGIntDir();
+  std::string dir = this->GetObjectsNormalDirectory(
+    this->CurrentProject, configName, gt->Target);
+  if(this->XcodeVersion >= 21)
+    {
+    dir += "$(CURRENT_ARCH)/";
+    }
+  else
+    {
+#ifdef __ppc__
+    dir += "ppc/";
+#endif
+#ifdef __i386
+    dir += "i386/";
+#endif
+    }
+  gt->ObjectDirectory = dir;
+}
diff --git a/Source/cmGlobalXCodeGenerator.h b/Source/cmGlobalXCodeGenerator.h
index b9cf775..800963b 100644
--- a/Source/cmGlobalXCodeGenerator.h
+++ b/Source/cmGlobalXCodeGenerator.h
@@ -153,6 +153,12 @@ private:
                           std::vector<cmLocalGenerator*>& generators);
   void WriteXCodePBXProj(std::ostream& fout, cmLocalGenerator* root,
                          std::vector<cmLocalGenerator*>& generators);
+  cmXCodeObject* CreateXCodeFileReferenceFromPath(const std::string &fullpath,
+                                                  cmTarget& cmtarget,
+                                                  const std::string &lang);
+  cmXCodeObject* CreateXCodeSourceFileFromPath(const std::string &fullpath,
+                                               cmTarget& cmtarget,
+                                               const std::string &lang);
   cmXCodeObject* CreateXCodeFileReference(cmSourceFile* sf,
                                           cmTarget& cmtarget);
   cmXCodeObject* CreateXCodeSourceFile(cmLocalGenerator* gen, 
@@ -200,6 +206,13 @@ protected:
   std::vector<cmXCodeObject*> XCodeObjects;
   cmXCodeObject* RootObject;
 private:
+  void ComputeTargetObjects(cmGeneratorTarget* gt) const;
+
+  std::string GetObjectsNormalDirectory(
+    const std::string &projName,
+    const std::string &configName,
+    const cmTarget *t) const;
+
   void addObject(cmXCodeObject *obj);
   std::string PostBuildMakeTarget(std::string const& tName,
                                   std::string const& configName);
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index aba2e38..56e3305 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -782,6 +782,7 @@ void cmMakefile::SetLocalGenerator(cmLocalGenerator* lg)
                        "\\.(h|hh|h\\+\\+|hm|hpp|hxx|in|txx|inl)$");
   this->AddSourceGroup("CMake Rules", "\\.rule$");
   this->AddSourceGroup("Resources", "\\.plist$");
+  this->AddSourceGroup("Object Files", "\\.(lo|o|obj)$");
 #endif
 
   this->WarnUnused = this->GetCMakeInstance()->GetWarnUnused();