1 files changed, 150 insertions, 0 deletions

diff --git a/Source/cmState.cxx b/Source/cmState.cxx
index 82a2939..4965ae3 100644
--- a/Source/cmState.cxx
+++ b/Source/cmState.cxx
@@ -197,6 +197,10 @@ void cmState::Initialize()
   this->Locations.clear();
   this->OutputLocations.clear();
   this->ParentPositions.clear();
+  this->CurrentSourceDirectoryComponents.clear();
+  this->CurrentBinaryDirectoryComponents.clear();
+  this->RelativePathTopSource.clear();
+  this->RelativePathTopBinary.clear();
 
   this->CreateSnapshot(Snapshot());
   this->DefineProperty
@@ -458,6 +462,10 @@ void cmState::SetSourceDirectory(std::string const& sourceDirectory)
 {
   this->SourceDirectory = sourceDirectory;
   cmSystemTools::ConvertToUnixSlashes(this->SourceDirectory);
+
+  cmSystemTools::SplitPath(
+      cmSystemTools::CollapseFullPath(this->SourceDirectory),
+        this->SourceDirectoryComponents);
 }
 
 const char* cmState::GetSourceDirectory() const
@@ -465,10 +473,19 @@ const char* cmState::GetSourceDirectory() const
   return this->SourceDirectory.c_str();
 }
 
+std::vector<std::string> const& cmState::GetSourceDirectoryComponents() const
+{
+  return this->SourceDirectoryComponents;
+}
+
 void cmState::SetBinaryDirectory(std::string const& binaryDirectory)
 {
   this->BinaryDirectory = binaryDirectory;
   cmSystemTools::ConvertToUnixSlashes(this->BinaryDirectory);
+
+  cmSystemTools::SplitPath(
+      cmSystemTools::CollapseFullPath(this->BinaryDirectory),
+        this->BinaryDirectoryComponents);
 }
 
 const char* cmState::GetBinaryDirectory() const
@@ -476,12 +493,103 @@ const char* cmState::GetBinaryDirectory() const
   return this->BinaryDirectory.c_str();
 }
 
+std::vector<std::string> const& cmState::GetBinaryDirectoryComponents() const
+{
+  return this->BinaryDirectoryComponents;
+}
+
+void cmState::Snapshot::ComputeRelativePathTopSource()
+{
+  // Relative path conversion inside the source tree is not used to
+  // construct relative paths passed to build tools so it is safe to use
+  // even when the source is a network path.
+
+  cmState::Snapshot snapshot = *this;
+  std::vector<cmState::Snapshot> snapshots;
+  snapshots.push_back(snapshot);
+  while (true)
+    {
+    snapshot = snapshot.GetParent();
+    if (snapshot.IsValid())
+      {
+      snapshots.push_back(snapshot);
+      }
+    else
+      {
+      break;
+      }
+    }
+
+  std::string result = snapshots.front().GetCurrentSourceDirectory();
+
+  for (std::vector<cmState::Snapshot>::const_iterator it =
+       snapshots.begin() + 1; it != snapshots.end(); ++it)
+    {
+    std::string currentSource = it->GetCurrentSourceDirectory();
+    if(cmSystemTools::IsSubDirectory(result, currentSource))
+      {
+      result = currentSource;
+      }
+    }
+  this->State->RelativePathTopSource[this->Position] = result;
+}
+
+void cmState::Snapshot::ComputeRelativePathTopBinary()
+{
+  cmState::Snapshot snapshot = *this;
+  std::vector<cmState::Snapshot> snapshots;
+  snapshots.push_back(snapshot);
+  while (true)
+    {
+    snapshot = snapshot.GetParent();
+    if (snapshot.IsValid())
+      {
+      snapshots.push_back(snapshot);
+      }
+    else
+      {
+      break;
+      }
+    }
+
+  std::string result =
+      snapshots.front().GetCurrentBinaryDirectory();
+
+  for (std::vector<cmState::Snapshot>::const_iterator it =
+       snapshots.begin() + 1; it != snapshots.end(); ++it)
+    {
+    std::string currentBinary = it->GetCurrentBinaryDirectory();
+    if(cmSystemTools::IsSubDirectory(result, currentBinary))
+      {
+      result = currentBinary;
+      }
+    }
+
+  // The current working directory on Windows cannot be a network
+  // path.  Therefore relative paths cannot work when the binary tree
+  // is a network path.
+  if(result.size() < 2 || result.substr(0, 2) != "//")
+    {
+    this->State->RelativePathTopBinary[this->Position] = result;
+    }
+  else
+    {
+    this->State->RelativePathTopBinary[this->Position] = "";
+    }
+}
+
 cmState::Snapshot cmState::CreateSnapshot(Snapshot originSnapshot)
 {
   PositionType pos = this->ParentPositions.size();
   this->ParentPositions.push_back(originSnapshot.Position);
   this->Locations.resize(this->Locations.size() + 1);
   this->OutputLocations.resize(this->OutputLocations.size() + 1);
+  this->CurrentSourceDirectoryComponents.resize(
+      this->CurrentSourceDirectoryComponents.size() + 1);
+  this->CurrentBinaryDirectoryComponents.resize(
+      this->CurrentBinaryDirectoryComponents.size() + 1);
+  this->RelativePathTopSource.resize(this->RelativePathTopSource.size() + 1);
+  this->RelativePathTopBinary.resize(this->RelativePathTopBinary.size() + 1);
   return cmState::Snapshot(this, pos);
 }
 
@@ -505,6 +613,11 @@ void cmState::Snapshot::SetCurrentSourceDirectory(std::string const& dir)
       this->State->Locations[this->Position]);
   this->State->Locations[this->Position] =
     cmSystemTools::CollapseFullPath(this->State->Locations[this->Position]);
+
+  cmSystemTools::SplitPath(
+      this->State->Locations[this->Position],
+      this->State->CurrentSourceDirectoryComponents[this->Position]);
+  this->ComputeRelativePathTopSource();
 }
 
 const char* cmState::Snapshot::GetCurrentBinaryDirectory() const
@@ -521,6 +634,43 @@ void cmState::Snapshot::SetCurrentBinaryDirectory(std::string const& dir)
   this->State->OutputLocations[this->Position] =
     cmSystemTools::CollapseFullPath(
         this->State->OutputLocations[this->Position]);
+
+  cmSystemTools::SplitPath(
+      this->State->OutputLocations[this->Position],
+      this->State->CurrentBinaryDirectoryComponents[this->Position]);
+  this->ComputeRelativePathTopBinary();
+}
+
+std::vector<std::string> const&
+cmState::Snapshot::GetCurrentSourceDirectoryComponents()
+{
+  return this->State->CurrentSourceDirectoryComponents[this->Position];
+}
+
+std::vector<std::string> const&
+cmState::Snapshot::GetCurrentBinaryDirectoryComponents()
+{
+  return this->State->CurrentBinaryDirectoryComponents[this->Position];
+}
+
+const char* cmState::Snapshot::GetRelativePathTopSource() const
+{
+  return this->State->RelativePathTopSource[this->Position].c_str();
+}
+
+const char* cmState::Snapshot::GetRelativePathTopBinary() const
+{
+  return this->State->RelativePathTopBinary[this->Position].c_str();
+}
+
+void cmState::Snapshot::SetRelativePathTopSource(const char* dir)
+{
+  this->State->RelativePathTopSource[this->Position] = dir;
+}
+
+void cmState::Snapshot::SetRelativePathTopBinary(const char* dir)
+{
+  this->State->RelativePathTopBinary[this->Position] = dir;
 }
 
 bool cmState::Snapshot::IsValid() const