https://github.com/jansvoboda11 created 
https://github.com/llvm/llvm-project/pull/160146

This PR uses the correctly-configured VFS to load the file specified via 
`-fms-secure-hotpatch-functions-file=`, matching other input files of the 
compiler.

>From 46cb594a30ec768a230109da4656259ffe4d85c6 Mon Sep 17 00:00:00 2001
From: Jan Svoboda <[email protected]>
Date: Fri, 19 Sep 2025 14:19:28 -0700
Subject: [PATCH] [clang] Load `-fms-secure-hotpatch-functions-file=` through
 the VFS

---
 clang/lib/CodeGen/CodeGenModule.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp 
b/clang/lib/CodeGen/CodeGenModule.cpp
index d05092a250040..0eac7c351b164 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -528,8 +528,7 @@ CodeGenModule::CodeGenModule(ASTContext &C,
   if (!CGO.MSSecureHotPatchFunctionsFile.empty() ||
       !CGO.MSSecureHotPatchFunctionsList.empty()) {
     if (!CGO.MSSecureHotPatchFunctionsFile.empty()) {
-      auto BufOrErr =
-          llvm::MemoryBuffer::getFile(CGO.MSSecureHotPatchFunctionsFile);
+      auto BufOrErr = FS->getBufferForFile(CGO.MSSecureHotPatchFunctionsFile);
       if (BufOrErr) {
         const llvm::MemoryBuffer &FileBuffer = **BufOrErr;
         for (llvm::line_iterator I(FileBuffer.getMemBufferRef(), true), E;

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