From: Daniel Dunbar <daniel@zuster.org>
Date: Wed, 8 Sep 2010 18:19:55 +0000 (+0000)
Subject: Frontend/-H: Add comment on why I used a temporary string here.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4566d1a0e5750dc21bd9120be3e1a98d60db5620;p=clang

Frontend/-H: Add comment on why I used a temporary string here.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@113379 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Frontend/PrintPreprocessedOutput.cpp b/lib/Frontend/PrintPreprocessedOutput.cpp
index cfaf8a23b1..5ae02f97bd 100644
--- a/lib/Frontend/PrintPreprocessedOutput.cpp
+++ b/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -263,6 +263,7 @@ void PrintPPOutputPPCallbacks::FileChanged(SourceLocation Loc,
   // predefines buffer.
   if (DumpHeaderIncludes && HasProcessedPredefines &&
       Reason == PPCallbacks::EnterFile) {
+    // Write to a temporary string to avoid unnecessary flushing on errs().
     llvm::SmallString<256> Msg;
     llvm::raw_svector_ostream OS(Msg);
     for (unsigned i = 0; i != CurrentIncludeDepth; ++i)