1 files changed, 12 insertions, 1 deletions
diff --git a/clang/lib/Frontend/DependencyFile.cpp b/clang/lib/Frontend/DependencyFile.cpp
index ccc7ed9..2888273 100644
--- a/clang/lib/Frontend/DependencyFile.cpp
+++ b/clang/lib/Frontend/DependencyFile.cpp
@@ -141,7 +141,18 @@ void DependencyCollector::maybeAddDependency(StringRef Filename,
 }
 
 bool DependencyCollector::addDependency(StringRef Filename) {
-  if (Seen.insert(Filename).second) {
+  StringRef SearchPath;
+#ifdef _WIN32
+  // Make the search insensitive to case and separators.
+  llvm::SmallString<256> TmpPath = Filename;
+  llvm::sys::path::native(TmpPath);
+  std::transform(TmpPath.begin(), TmpPath.end(), TmpPath.begin(), ::tolower);
+  SearchPath = TmpPath.str();
+#else
+  SearchPath = Filename;
+#endif
+
+  if (Seen.insert(SearchPath).second) {
     Dependencies.push_back(std::string(Filename));
     return true;
   }