use cmSystemTools::MoveFileIfDifferent()

This is better than doing CopyFileIfDifferent() followed by RemoveFile() in
two ways:

 - it is more efficient, as it avoids disk I/O for the data, even if the
   files here are usually small
 - it is atomic, so an abort during the copy will not leave a destination file
   with partial data behind

3 files changed, 4 insertions, 8 deletions

diff --git a/Source/cmGeneratorTarget.cxx b/Source/cmGeneratorTarget.cxx
index b4706a3..f1c48cc 100644
--- a/Source/cmGeneratorTarget.cxx
+++ b/Source/cmGeneratorTarget.cxx
@@ -3417,8 +3417,7 @@ std::string cmGeneratorTarget::GetPchHeader(const std::string& config,
         file << pchEpilogue << "\n";
       }
     }
-    cmSystemTools::CopyFileIfDifferent(filename_tmp, filename);
-    cmSystemTools::RemoveFile(filename_tmp);
+    cmSystemTools::MoveFileIfDifferent(filename_tmp, filename);
   }
   return inserted.first->second;
 }
@@ -3451,8 +3450,7 @@ std::string cmGeneratorTarget::GetPchSource(const std::string& config,
       cmGeneratedFileStream file(filename_tmp);
       file << "/* generated by CMake */\n";
     }
-    cmSystemTools::CopyFileIfDifferent(filename_tmp, filename);
-    cmSystemTools::RemoveFile(filename_tmp);
+    cmSystemTools::MoveFileIfDifferent(filename_tmp, filename);
   }
   return inserted.first->second;
 }
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 9152e94..3d8c3fb 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -2275,8 +2275,7 @@ void cmLocalGenerator::AddUnityBuild(cmGeneratorTarget* target,
           }
         }
       }
-      cmSystemTools::CopyFileIfDifferent(filename_tmp, filename);
-      cmSystemTools::RemoveFile(filename_tmp);
+      cmSystemTools::MoveFileIfDifferent(filename_tmp, filename);
 
       target->AddSource(filename, true);
 
diff --git a/Source/cmUseMangledMesaCommand.cxx b/Source/cmUseMangledMesaCommand.cxx
index cfc00e8..1fd386b 100644
--- a/Source/cmUseMangledMesaCommand.cxx
+++ b/Source/cmUseMangledMesaCommand.cxx
@@ -98,7 +98,6 @@ void CopyAndFullPathMesaHeader(const std::string& source,
   // close the files before attempting to copy
   fin.close();
   fout.close();
-  cmSystemTools::CopyFileIfDifferent(tempOutputFile, outFile);
-  cmSystemTools::RemoveFile(tempOutputFile);
+  cmSystemTools::MoveFileIfDifferent(tempOutputFile, outFile);
 }
 }