From f083a242eb9fe2934b7ac9719fc6db18bbfb725f Mon Sep 17 00:00:00 2001
From: Jan Svoboda <jan_svoboda@apple.com>
Date: Thu, 25 Sep 2025 15:00:10 -0700
Subject: [PATCH] [clang] Pass `-fbasic-block-sections=list=` through the VFS

---
 clang/lib/CodeGen/BackendUtil.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/CodeGen/BackendUtil.cpp b/clang/lib/CodeGen/BackendUtil.cpp
index d2ab7aa0b0369..3f38741f24a60 100644
--- a/clang/lib/CodeGen/BackendUtil.cpp
+++ b/clang/lib/CodeGen/BackendUtil.cpp
@@ -437,7 +437,8 @@ static bool initTargetOptions(const CompilerInstance &CI,
 
   if (Options.BBSections == llvm::BasicBlockSection::List) {
     ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
-        MemoryBuffer::getFile(CodeGenOpts.BBSections.substr(5));
+        CI.getVirtualFileSystem().getBufferForFile(
+            CodeGenOpts.BBSections.substr(5));
     if (!MBOrErr) {
       Diags.Report(diag::err_fe_unable_to_load_basic_block_sections_file)
           << MBOrErr.getError().message();