From fa5284f07f20e6d62ca5d2dab36ecc48c0511eba Mon Sep 17 00:00:00 2001
From: Mike Pagel <Mike.Pagel@bmw.de>
Date: Mon, 28 Sep 2015 15:33:10 +0200
Subject: VS: Prevent generated "rule" files from causing rebuilds

When we generate a ".rule" file to attach a custom command in a VS IDE
project, set the file timestamp to be old enough to prevent the rule
from re-running due to its timestamp.
---
 Source/cmVisualStudio10TargetGenerator.cxx | 27 +++++++++++++++++++++++++++
 Source/cmVisualStudio10TargetGenerator.h   |  2 ++
 2 files changed, 29 insertions(+)

diff --git a/Source/cmVisualStudio10TargetGenerator.cxx b/Source/cmVisualStudio10TargetGenerator.cxx
index 92403e3..6c71313 100644
--- a/Source/cmVisualStudio10TargetGenerator.cxx
+++ b/Source/cmVisualStudio10TargetGenerator.cxx
@@ -9,6 +9,7 @@
   implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   See the License for more information.
 ============================================================================*/
+#include "windows.h"
 #include "cmVisualStudio10TargetGenerator.h"
 #include "cmGlobalVisualStudio10Generator.h"
 #include "cmGeneratorTarget.h"
@@ -871,6 +872,9 @@ cmVisualStudio10TargetGenerator::WriteCustomRule(cmSourceFile const* source,
         fout << "# generated from CMake\n";
         fout.flush();
         fout.close();
+        // Force given file to have a very old timestamp, thus
+        // preventing dependent rebuilds.
+        this->ForceOld(sourcePath);
         }
       else
         {
@@ -3458,3 +3462,26 @@ cmVisualStudio10TargetGenerator
   this->WriteString("<None Include=\"", 2);
   (*this->BuildFileStream) << cmVS10EscapeXML(keyFile) << "\" />\n";
 }
+
+bool cmVisualStudio10TargetGenerator::ForceOld(const std::string& source) const
+{
+  HANDLE h = CreateFileW(
+    cmSystemTools::ConvertToWindowsExtendedPath(source).c_str(),
+    FILE_WRITE_ATTRIBUTES,
+    FILE_SHARE_WRITE, 0, OPEN_EXISTING,
+    FILE_FLAG_BACKUP_SEMANTICS, 0);
+  if (!h)
+    {
+    return false;
+    }
+
+  FILETIME const ftime_20010101 = { 3365781504, 29389701 };
+  if (!SetFileTime(h, &ftime_20010101, &ftime_20010101, &ftime_20010101))
+    {
+    CloseHandle(h);
+    return false;
+    }
+
+  CloseHandle(h);
+  return true;
+}
diff --git a/Source/cmVisualStudio10TargetGenerator.h b/Source/cmVisualStudio10TargetGenerator.h
index 5fadb60..f2aaf05 100644
--- a/Source/cmVisualStudio10TargetGenerator.h
+++ b/Source/cmVisualStudio10TargetGenerator.h
@@ -130,6 +130,8 @@ private:
   cmIDEFlagTable const* GetLinkFlagTable() const;
   cmIDEFlagTable const* GetMasmFlagTable() const;
 
+  bool ForceOld(const std::string& source) const;
+
 private:
   typedef cmVisualStudioGeneratorOptions Options;
   typedef std::map<std::string, Options*> OptionsMap;
-- 
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