diff --git a/clang-tools-extra/clangd/GlobalCompilationDatabase.cpp b/clang-tools-extra/clangd/GlobalCompilationDatabase.cpp
--- a/clang-tools-extra/clangd/GlobalCompilationDatabase.cpp
+++ b/clang-tools-extra/clangd/GlobalCompilationDatabase.cpp
@@ -41,34 +41,6 @@
 
 namespace clang {
 namespace clangd {
-namespace {
-
-// Variant of parent_path that operates only on absolute paths.
-PathRef absoluteParent(PathRef Path) {
-  assert(llvm::sys::path::is_absolute(Path));
-#if defined(_WIN32)
-  // llvm::sys says "C:\" is absolute, and its parent is "C:" which is relative.
-  // This unhelpful behavior seems to have been inherited from boost.
-  if (llvm::sys::path::relative_path(Path).empty()) {
-    return PathRef();
-  }
-#endif
-  PathRef Result = llvm::sys::path::parent_path(Path);
-  assert(Result.empty() || llvm::sys::path::is_absolute(Result));
-  return Result;
-}
-
-// Runs the given action on all parent directories of filename, starting from
-// deepest directory and going up to root. Stops whenever action succeeds.
-void actOnAllParentDirectories(PathRef FileName,
-                               llvm::function_ref<bool(PathRef)> Action) {
-  for (auto Path = absoluteParent(FileName); !Path.empty() && !Action(Path);
-       Path = absoluteParent(Path))
-    ;
-}
-
-} // namespace
-
 tooling::CompileCommand
 GlobalCompilationDatabase::getFallbackCommand(PathRef File) const {
   std::vector<std::string> Argv = {"clang"};
diff --git a/clang-tools-extra/clangd/support/Path.h b/clang-tools-extra/clangd/support/Path.h
--- a/clang-tools-extra/clangd/support/Path.h
+++ b/clang-tools-extra/clangd/support/Path.h
@@ -28,6 +28,10 @@
 std::string maybeCaseFoldPath(PathRef Path);
 bool pathEqual(PathRef, PathRef);
 
+// Runs the given action on all parent directories of filename, starting from
+// deepest directory and going up to root. Stops whenever action succeeds.
+void actOnAllParentDirectories(PathRef FileName,
+                               llvm::function_ref<bool(PathRef)> Action);
 } // namespace clangd
 } // namespace clang
 
diff --git a/clang-tools-extra/clangd/support/Path.cpp b/clang-tools-extra/clangd/support/Path.cpp
--- a/clang-tools-extra/clangd/support/Path.cpp
+++ b/clang-tools-extra/clangd/support/Path.cpp
@@ -7,8 +7,27 @@
 //===----------------------------------------------------------------------===//
 
 #include "support/Path.h"
+#include "llvm/Support/Path.h"
+
 namespace clang {
 namespace clangd {
+namespace {
+// Variant of parent_path that operates only on absolute paths.
+PathRef absoluteParent(PathRef Path) {
+  assert(llvm::sys::path::is_absolute(Path));
+#if defined(_WIN32)
+  // llvm::sys says "C:\" is absolute, and its parent is "C:" which is relative.
+  // This unhelpful behavior seems to have been inherited from boost.
+  if (llvm::sys::path::relative_path(Path).empty()) {
+    return PathRef();
+  }
+#endif
+  PathRef Result = llvm::sys::path::parent_path(Path);
+  assert(Result.empty() || llvm::sys::path::is_absolute(Result));
+  return Result;
+}
+
+} // namespace
 
 std::string maybeCaseFoldPath(PathRef Path) {
 #if defined(_WIN32) || defined(__APPLE__)
@@ -26,5 +45,11 @@
 #endif
 }
 
+void actOnAllParentDirectories(PathRef FileName,
+                               llvm::function_ref<bool(PathRef)> Action) {
+  for (auto Path = absoluteParent(FileName); !Path.empty() && !Action(Path);
+       Path = absoluteParent(Path))
+    ;
+}
 } // namespace clangd
 } // namespace clang