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-rw-r--r--llvm/lib/Support/Windows/WindowsSupport.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Support/Windows/WindowsSupport.h b/llvm/lib/Support/Windows/WindowsSupport.h
index 1d1cedcce29..62e20f267aa 100644
--- a/llvm/lib/Support/Windows/WindowsSupport.h
+++ b/llvm/lib/Support/Windows/WindowsSupport.h
@@ -19,6 +19,9 @@
//=== is guaranteed to work on *all* Win32 variants.
//===----------------------------------------------------------------------===//
+#ifndef LLVM_SUPPORT_WINDOWSSUPPORT_H
+#define LLVM_SUPPORT_WINDOWSSUPPORT_H
+
// mingw-w64 tends to define it as 0x0502 in its headers.
#undef _WIN32_WINNT
#undef _WIN32_IE
@@ -178,3 +181,5 @@ std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
} // end namespace windows
} // end namespace sys
} // end namespace llvm.
+
+#endif
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