[PATCH] clang-cl: Flush stdout after writing the /showIncludes output

[Ehsan Akhgari]

Hi rnk,

Before this patch, you could get lines in the output such as:
Note: including file:   ../../dist/include/js/Tc:/path/to/foo.cpp(1,1) :  error(clang): static_assert failed...

This patch ensures that the stdout output from showIncludes won't be garbled
in the terminal like this, and it also helps applications that use the output
to generate dependency information if they happen to capture both stdout and
stderr.

http://reviews.llvm.org/D4559

Files:
  lib/Frontend/HeaderIncludeGen.cpp

Index: lib/Frontend/HeaderIncludeGen.cpp
===================================================================
--- lib/Frontend/HeaderIncludeGen.cpp
+++ lib/Frontend/HeaderIncludeGen.cpp
@@ -131,5 +131,6 @@
     Msg += '\n';
 
     OutputFile->write(Msg.data(), Msg.size());
+    OutputFile->flush();
   }
 }
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