[clang] Use the VFS to check the system framework marker

[jansvoboda11]

This PR uses the VFS/FileManager to check the system framework marker instead of going straight to the real file system. This matches the behavior of other input files of the compiler.

[llvmbot]

@llvm/pr-subscribers-clang

Author: Jan Svoboda (jansvoboda11)

Changes

This PR uses the VFS/FileManager to check the system framework marker instead of going straight to the real file system. This matches the behavior of other input files of the compiler.

---

Full diff: https://github.com/llvm/llvm-project/pull/160946.diff

1 Files Affected:

• (modified) clang/lib/Lex/HeaderSearch.cpp (+1-2)

diff --git a/clang/lib/Lex/HeaderSearch.cpp b/clang/lib/Lex/HeaderSearch.cpp
index f28a74f5d0ae5..ae09f70ee7896 100644
--- a/clang/lib/Lex/HeaderSearch.cpp
+++ b/clang/lib/Lex/HeaderSearch.cpp
@@ -672,9 +672,8 @@ OptionalFileEntryRef DirectoryLookup::DoFrameworkLookup(
     if (getDirCharacteristic() == SrcMgr::C_User) {
       SmallString<1024> SystemFrameworkMarker(FrameworkName);
       SystemFrameworkMarker += ".system_framework";
-      if (llvm::sys::fs::exists(SystemFrameworkMarker)) {
+      if (FileMgr.getOptionalFileRef(SystemFrameworkMarker))
         CacheEntry.IsUserSpecifiedSystemFramework = true;
-      }
     }
   }