https://github.com/egorzhdan created 
https://github.com/llvm/llvm-project/pull/84556

This fixes tests that are going to be upstreamed in the near future. Currently 
they are failing downstream in the Apple open source fork.

Failing tests
  Clang :: APINotes/retain-count-convention.m
  Clang :: APINotes/types.m
  Clang :: APINotes/versioned-multi.c
  Clang :: APINotes/versioned.m

Since 2e5af56 got merged, Clang now enables `LangOpts.APINotesModules` when 
reading a precompiled module that was built with API Notes enabled. This is 
correct. The logic in APINotesManager needs to be adjusted to handle this.

rdar://123526142

>From e939da2aa1435027163efa4446e78b90c3d9243a Mon Sep 17 00:00:00 2001
From: Egor Zhdan <e_zh...@apple.com>
Date: Fri, 8 Mar 2024 20:09:50 +0000
Subject: [PATCH] [APINotes] Fix failing tests after a PCM logic change

This fixes tests that are going to be upstreamed in the near future. Currently 
they are failing downstream in the Apple open source fork.

Failing tests
  Clang :: APINotes/retain-count-convention.m
  Clang :: APINotes/types.m
  Clang :: APINotes/versioned-multi.c
  Clang :: APINotes/versioned.m

Since 2e5af56 got merged, Clang now enables `LangOpts.APINotesModules` when 
reading a precompiled module that was built with API Notes enabled. This is 
correct. The logic in APINotesManager needs to be adjusted to handle this.

rdar://123526142
---
 clang/lib/APINotes/APINotesManager.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/APINotes/APINotesManager.cpp 
b/clang/lib/APINotes/APINotesManager.cpp
index d3aef09dac9105..f60f09e2b3c231 100644
--- a/clang/lib/APINotes/APINotesManager.cpp
+++ b/clang/lib/APINotes/APINotesManager.cpp
@@ -224,7 +224,7 @@ APINotesManager::getCurrentModuleAPINotes(Module *M, bool 
LookInModule,
   llvm::SmallVector<FileEntryRef, 2> APINotes;
 
   // First, look relative to the module itself.
-  if (LookInModule) {
+  if (LookInModule && M->Directory) {
     // Local function to try loading an API notes file in the given directory.
     auto tryAPINotes = [&](DirectoryEntryRef Dir, bool WantPublic) {
       if (auto File = findAPINotesFile(Dir, ModuleName, WantPublic)) {

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