ENH: Simplify makefile target generator listing of object files to clean.

Source/cmMakefileExecutableTargetGenerator.cxx

@@ -474,12 +474,8 @@ void cmMakefileExecutableTargetGenerator::WriteExecutableRule(bool relink)
   // Write the main driver rule to build everything in this target.
   this->WriteTargetDriverRule(targetFullPath.c_str(), relink);
 
-  // Clean all the possible executable names and symlinks and object files.
+  // Clean all the possible executable names and symlinks.
   this->CleanFiles.insert(this->CleanFiles.end(),
                           exeCleanFiles.begin(),
                           exeCleanFiles.end());
-  this->CleanFiles.insert(this->CleanFiles.end(),
-                          this->Objects.begin(),
-                          this->Objects.end());
 }
-

Source/cmMakefileLibraryTargetGenerator.cxx

@@ -911,11 +911,7 @@ void cmMakefileLibraryTargetGenerator::WriteLibraryRules
   // Write the main driver rule to build everything in this target.
   this->WriteTargetDriverRule(targetFullPath.c_str(), relink);
 
-  // Clean all the possible library names and symlinks and object files.
+  // Clean all the possible library names and symlinks.
   this->CleanFiles.insert(this->CleanFiles.end(),
-                          libCleanFiles.begin(),libCleanFiles.end()); 
+                          libCleanFiles.begin(),libCleanFiles.end());
-  this->CleanFiles.insert(this->CleanFiles.end(),
-                          this->Objects.begin(),
-                          this->Objects.end());
 }
-

Source/cmMakefileTargetGenerator.cxx

@@ -327,6 +327,7 @@ void cmMakefileTargetGenerator::WriteObjectRuleFiles(cmSourceFile& source)
     this->ExtraContent.insert(obj);
     }
   this->Objects.push_back(obj);
+  this->CleanFiles.push_back(obj);
 
   // TODO: Remove
   //std::string relativeObj