From b94514f02018d566abc0156d5a729ebe9ee49105 Mon Sep 17 00:00:00 2001
From: Peter Collingbourne <peter@pcc.me.uk>
Date: Wed, 16 May 2012 23:57:09 +0100
Subject: [PATCH] Ninja: mark rules/build file streams failed if error occurred
 (#13067, #13105)

This causes cmGeneratedFileStream to delete the temporary files,
rather than overwriting the (working) existing files.
---
 Source/cmGlobalNinjaGenerator.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Source/cmGlobalNinjaGenerator.cxx b/Source/cmGlobalNinjaGenerator.cxx
index 9cbd50233..5f52e1d2e 100644
--- a/Source/cmGlobalNinjaGenerator.cxx
+++ b/Source/cmGlobalNinjaGenerator.cxx
@@ -385,6 +385,11 @@ void cmGlobalNinjaGenerator::Generate()
   this->WriteTargetAliases(*this->BuildFileStream);
   this->WriteBuiltinTargets(*this->BuildFileStream);
 
+  if (cmSystemTools::GetErrorOccuredFlag()) {
+    this->RulesFileStream->setstate(std::ios_base::failbit);
+    this->BuildFileStream->setstate(std::ios_base::failbit);
+  }
+
   this->CloseRulesFileStream();
   this->CloseBuildFileStream();
 }