Index: lldb/trunk/include/lldb/Utility/FileCollector.h
===================================================================
--- lldb/trunk/include/lldb/Utility/FileCollector.h
+++ lldb/trunk/include/lldb/Utility/FileCollector.h
@@ -25,7 +25,7 @@
 /// the VFS.
 class FileCollector {
 public:
-  FileCollector(const FileSpec &root);
+  FileCollector(const FileSpec &root, const FileSpec &overlay);
 
   void AddFile(const llvm::Twine &file);
   void AddFile(const FileSpec &file) { return AddFile(file.GetPath()); }
@@ -59,6 +59,9 @@
   /// The root directory where files are copied.
   FileSpec m_root;
 
+  /// The root directory where the VFS overlay lives.
+  FileSpec m_overlay_root;
+
   /// Tracks already seen files so they can be skipped.
   llvm::StringSet<> m_seen;
 
Index: lldb/trunk/include/lldb/Utility/Reproducer.h
===================================================================
--- lldb/trunk/include/lldb/Utility/Reproducer.h
+++ lldb/trunk/include/lldb/Utility/Reproducer.h
@@ -91,7 +91,8 @@
 
   FileProvider(const FileSpec &directory)
       : Provider(directory),
-        m_collector(directory.CopyByAppendingPathComponent("root")) {}
+        m_collector(directory.CopyByAppendingPathComponent("root"), directory) {
+  }
 
   FileCollector &GetFileCollector() { return m_collector; }
 
@@ -132,8 +133,8 @@
 class DataRecorder {
 public:
   DataRecorder(const FileSpec &filename, std::error_code &ec)
-      : m_filename(std::move(filename)),
-        m_os(m_filename.GetPath(), ec, llvm::sys::fs::F_Text), m_record(true) {}
+      : m_filename(filename.GetFilename().GetStringRef()),
+        m_os(filename.GetPath(), ec, llvm::sys::fs::F_Text), m_record(true) {}
 
   static llvm::Expected<std::unique_ptr<DataRecorder>>
   Create(const FileSpec &filename);
Index: lldb/trunk/lit/Reproducer/TestReuseDirectory.test
===================================================================
--- lldb/trunk/lit/Reproducer/TestReuseDirectory.test
+++ lldb/trunk/lit/Reproducer/TestReuseDirectory.test
@@ -8,3 +8,10 @@
 # RUN: %lldb -x -b -s %S/Inputs/GDBRemoteCapture.in --capture --capture-path %t.repro %t.out | FileCheck %S/TestGDBRemoteRepro.test --check-prefix CHECK --check-prefix CAPTURE
 # RUN: %lldb -x -b -s %S/Inputs/GDBRemoteCapture.in --capture --capture-path %t.repro %t.out | FileCheck %S/TestGDBRemoteRepro.test --check-prefix CHECK --check-prefix CAPTURE
 # RUN: %lldb --replay %t.repro | FileCheck %S/TestGDBRemoteRepro.test --check-prefix CHECK --check-prefix REPLAY
+
+# Test that we can replay from a different location, i.e. that the reproducer
+# is relocatable.
+
+# RUN: rm -rf %t.repro_moved
+# RUN: mv %t.repro %t.repro_moved
+# RUN: %lldb --replay %t.repro_moved | FileCheck %S/TestGDBRemoteRepro.test --check-prefix CHECK --check-prefix REPLAY
Index: lldb/trunk/source/API/SBDebugger.cpp
===================================================================
--- lldb/trunk/source/API/SBDebugger.cpp
+++ lldb/trunk/source/API/SBDebugger.cpp
@@ -82,6 +82,12 @@
     if (auto err = yin.error())
       return {};
 
+    for (auto &file : files) {
+      FileSpec absolute_path =
+          loader->GetRoot().CopyByAppendingPathComponent(file);
+      file = absolute_path.GetPath();
+    }
+
     return llvm::make_unique<CommandLoader>(std::move(files));
   }
 
Index: lldb/trunk/source/Host/common/FileSystem.cpp
===================================================================
--- lldb/trunk/source/Host/common/FileSystem.cpp
+++ lldb/trunk/source/Host/common/FileSystem.cpp
@@ -63,8 +63,9 @@
   if (!buffer)
     return llvm::errorCodeToError(buffer.getError());
 
-  InstanceImpl().emplace(
-      llvm::vfs::getVFSFromYAML(std::move(buffer.get()), nullptr, ""), true);
+  InstanceImpl().emplace(llvm::vfs::getVFSFromYAML(std::move(buffer.get()),
+                                                   nullptr, mapping.GetPath()),
+                         true);
 
   return llvm::Error::success();
 }
Index: lldb/trunk/source/Utility/FileCollector.cpp
===================================================================
--- lldb/trunk/source/Utility/FileCollector.cpp
+++ lldb/trunk/source/Utility/FileCollector.cpp
@@ -33,7 +33,8 @@
   return true;
 }
 
-FileCollector::FileCollector(const FileSpec &root) : m_root(root) {
+FileCollector::FileCollector(const FileSpec &root, const FileSpec &overlay_root)
+    : m_root(root), m_overlay_root(overlay_root) {
   sys::fs::create_directories(m_root.GetPath(), true);
 }
 
@@ -133,7 +134,9 @@
 std::error_code FileCollector::WriteMapping(const FileSpec &mapping_file) {
   std::lock_guard<std::mutex> lock(m_mutex);
 
-  const std::string root = m_root.GetPath();
+  llvm::StringRef root = m_overlay_root.GetPath();
+
+  m_vfs_writer.setOverlayDir(root);
   m_vfs_writer.setCaseSensitivity(IsCaseSensitivePath(root));
   m_vfs_writer.setUseExternalNames(false);
 
Index: lldb/trunk/unittests/Utility/FileCollectorTest.cpp
===================================================================
--- lldb/trunk/unittests/Utility/FileCollectorTest.cpp
+++ lldb/trunk/unittests/Utility/FileCollectorTest.cpp
@@ -105,7 +105,7 @@
 TEST(FileCollectorTest, AddFile) {
   ScopedDir root("add_file_root", true);
   FileSpec root_fs(root.Path);
-  TestingFileCollector file_collector(root_fs);
+  TestingFileCollector file_collector(root_fs, root_fs);
 
   file_collector.AddFile(FileSpec("/path/to/a"));
   file_collector.AddFile(FileSpec("/path/to/b"));
@@ -132,7 +132,7 @@
   // Create file collector and add files.
   ScopedDir root("copy_files_root", true);
   FileSpec root_fs(root.Path);
-  TestingFileCollector file_collector(root_fs);
+  TestingFileCollector file_collector(root_fs, root_fs);
   file_collector.AddFile(a.Path);
   file_collector.AddFile(b.Path);
   file_collector.AddFile(c.Path);
@@ -174,7 +174,7 @@
   // Root where files are copied to.
   ScopedDir reproducer_root("reproducer_root", true);
   FileSpec root_fs(reproducer_root.Path);
-  TestingFileCollector file_collector(root_fs);
+  TestingFileCollector file_collector(root_fs, root_fs);
 
   // Add all the files to the collector.
   file_collector.AddFile(a.Path);