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-rw-r--r--clang/lib/Frontend/InitHeaderSearch.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/clang/lib/Frontend/InitHeaderSearch.cpp b/clang/lib/Frontend/InitHeaderSearch.cpp
index 3da38fb0463..c552512dc95 100644
--- a/clang/lib/Frontend/InitHeaderSearch.cpp
+++ b/clang/lib/Frontend/InitHeaderSearch.cpp
@@ -118,7 +118,12 @@ void InitHeaderSearch::AddPath(const llvm::Twine &Path,
// Handle isysroot.
if ((Group == System || Group == CXXSystem) && !IgnoreSysRoot &&
+#if defined(_WIN32)
+ !MappedPathStr.empty() &&
+ llvm::sys::path::is_separator(MappedPathStr[0]) &&
+#else
llvm::sys::path::is_absolute(MappedPathStr) &&
+#endif
IsNotEmptyOrRoot) {
MappedPathStorage.clear();
MappedPathStr =
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