VS10: Avoid creating .rule files next to outputs (#13141)

Hide custom command .rule files inside the CMakeFiles directory.  Ensure
a short, deterministic, and unique name by using a hash of the directory
path containing the output file.  Preserve the file name so the entry in
the IDE is human-readable.  Clarify the comment that explains why the
rule file must be created on disk.

1 files changed, 18 insertions, 0 deletions

diff --git a/Source/cmGlobalVisualStudio10Generator.cxx b/Source/cmGlobalVisualStudio10Generator.cxx
index 22ead10..28d738a 100644
--- a/Source/cmGlobalVisualStudio10Generator.cxx
+++ b/Source/cmGlobalVisualStudio10Generator.cxx
@@ -212,3 +212,21 @@ bool cmGlobalVisualStudio10Generator::Find64BitTools(cmMakefile* mf)
     return false;
     }
 }
+
+//----------------------------------------------------------------------------
+std::string
+cmGlobalVisualStudio10Generator
+::GenerateRuleFile(std::string const& output) const
+{
+  // The VS 10 generator needs to create the .rule files on disk.
+  // Hide them away under the CMakeFiles directory.
+  std::string ruleDir = this->GetCMakeInstance()->GetHomeOutputDirectory();
+  ruleDir += cmake::GetCMakeFilesDirectory();
+  ruleDir += "/";
+  ruleDir += cmSystemTools::ComputeStringMD5(
+    cmSystemTools::GetFilenamePath(output).c_str());
+  std::string ruleFile = ruleDir + "/";
+  ruleFile += cmSystemTools::GetFilenameName(output);
+  ruleFile += ".rule";
+  return ruleFile;
+}