Don't touch unchanged file for in-place edit.

This fixes llvm.org/PR15087.

llvm-svn: 173919

diff --git a/clang-tools-extra/clang-format/ClangFormat.cpp b/clang-tools-extra/clang-format/ClangFormat.cpp
index 23043a3..da032d5 100644 (file)
--- a/clang-tools-extra/clang-format/ClangFormat.cpp
+++ b/clang-tools-extra/clang-format/ClangFormat.cpp
@@ -97,6 +97,9 @@ static void format() {
   Rewriter Rewrite(Sources, LangOptions());
   tooling::applyAllReplacements(Replaces, Rewrite);
   if (Inplace) {
+    if (Replaces.size() == 0)
+      return; // Nothing changed, don't touch the file.
+
     std::string ErrorInfo;
     llvm::raw_fd_ostream FileStream(FileName.c_str(), ErrorInfo,
                                     llvm::raw_fd_ostream::F_Binary);