https://github.com/chrisnc updated
https://github.com/llvm/llvm-project/pull/97534
>From 1b39c59e0ec3cbe1f2cabc650b983883439dde31 Mon Sep 17 00:00:00 2001
From: Chris Copeland <ch...@chrisnc.net>
Date: Wed, 3 Jul 2024 00:11:39 -0700
Subject: [PATCH] [clang] Define `ATOMIC_FLAG_INIT` correctly for C++.
---
clang/docs/ReleaseNotes.rst | 3 +++
clang/lib/Headers/stdatomic.h | 4 ++++
clang/test/Headers/stdatomic.c | 5 +++++
3 files changed, 12 insertions(+)
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index d03459f7cc42c..587921850798b 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -891,6 +891,9 @@ Bug Fixes in This Version
- Fixed an assertion failure when a template non-type parameter contains
an invalid expression.
+- Fixed the definition of ``ATOMIC_FLAG_INIT`` in ``<stdatomic.h>`` so it can
+ be used in C++.
+
Bug Fixes to Compiler Builtins
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/clang/lib/Headers/stdatomic.h b/clang/lib/Headers/stdatomic.h
index 2027055f38796..1991351f9e9ef 100644
--- a/clang/lib/Headers/stdatomic.h
+++ b/clang/lib/Headers/stdatomic.h
@@ -172,7 +172,11 @@ typedef _Atomic(uintmax_t) atomic_uintmax_t;
typedef struct atomic_flag { atomic_bool _Value; } atomic_flag;
+#ifdef __cplusplus
+#define ATOMIC_FLAG_INIT {false}
+#else
#define ATOMIC_FLAG_INIT { 0 }
+#endif
/* These should be provided by the libc implementation. */
#ifdef __cplusplus
diff --git a/clang/test/Headers/stdatomic.c b/clang/test/Headers/stdatomic.c
index 3643fd4245b31..9afd531a9ed9b 100644
--- a/clang/test/Headers/stdatomic.c
+++ b/clang/test/Headers/stdatomic.c
@@ -1,5 +1,8 @@
// RUN: %clang_cc1 -std=c11 -E %s | FileCheck %s
// RUN: %clang_cc1 -std=c11 -fms-compatibility -E %s | FileCheck %s
+// RUN: %clang_cc1 -std=c11 %s -verify
+// RUN: %clang_cc1 -x c++ -std=c++11 %s -verify
+// expected-no-diagnostics
#include <stdatomic.h>
int bool_lock_free = ATOMIC_BOOL_LOCK_FREE;
@@ -31,3 +34,5 @@ int llong_lock_free = ATOMIC_LLONG_LOCK_FREE;
int pointer_lock_free = ATOMIC_POINTER_LOCK_FREE;
// CHECK: pointer_lock_free = {{ *[012] *;}}
+
+atomic_flag f = ATOMIC_FLAG_INIT;
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