BUG: fix for 3557 TargetEnvironment for MIDL Compiler set correctly for 64 bit

Source/cmLocalVisualStudio7Generator.cxx

@@ -551,7 +551,18 @@ void cmLocalVisualStudio7Generator::WriteConfiguration(std::ostream& fout,
   this->OutputDefineFlags(defineFlags.c_str(), fout);
   fout << "\"\n";
   fout << "\t\t\t\tMkTypLibCompatible=\"FALSE\"\n";
-  fout << "\t\t\t\tTargetEnvironment=\"1\"\n";
+  if( this->PlatformName == "x64" )
+    {
+    fout << "\t\t\t\tTargetEnvironment=\"3\"\n";
+    }
+  else if( this->PlatformName == "ia64" )
+    {
+    fout << "\t\t\t\tTargetEnvironment=\"2\"\n";
+    }
+  else
+    {
+    fout << "\t\t\t\tTargetEnvironment=\"1\"\n";
+    }
   fout << "\t\t\t\tGenerateStublessProxies=\"TRUE\"\n";
   fout << "\t\t\t\tTypeLibraryName=\"$(InputName).tlb\"\n";
   fout << "\t\t\t\tOutputDirectory=\"$(IntDir)\"\n";