rename <stdatomic.h> to <__msvc_cxx_stdatomic.h> (#3183)

* rename stl stdatomic.h to __msvc_cxx_stdatomic.h

* rename inclusions of cxx stdatomic.

* rename __msvc_cxx_stdatomic.h to __msvc_cxx_stdatomic.hpp

* correct include guards and header comments.

* Apply suggestions from code review

* remove stdatomic.h from stl's CMakeLists.txt so it's no copied during github build.

* remove stdatomic.h from header-units.json

Co-authored-by: Casey Carter <cacarter@microsoft.com>

Author: Charlie Barto

stl/CMakeLists.txt

@@ -4,6 +4,7 @@
 set(HEADERS
     ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_all_public_headers.hpp
     ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_chrono.hpp
+    ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_cxx_stdatomic.hpp
     ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_format_ucd_tables.hpp
     ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_int128.hpp
     ${CMAKE_CURRENT_LIST_DIR}/inc/__msvc_iter_core.hpp
@@ -191,7 +192,6 @@ set(HEADERS
     ${CMAKE_CURRENT_LIST_DIR}/inc/sstream
     ${CMAKE_CURRENT_LIST_DIR}/inc/stack
     ${CMAKE_CURRENT_LIST_DIR}/inc/stacktrace
-    ${CMAKE_CURRENT_LIST_DIR}/inc/stdatomic.h
     ${CMAKE_CURRENT_LIST_DIR}/inc/stdexcept
     ${CMAKE_CURRENT_LIST_DIR}/inc/stop_token
     ${CMAKE_CURRENT_LIST_DIR}/inc/streambuf

stl/inc/__msvc_all_public_headers.hpp

@@ -139,13 +139,11 @@
 #include <vector>
 
 #ifndef _M_CEE_PURE
+#include <__msvc_cxx_stdatomic.hpp>
 #include <atomic>
 #include <barrier>
 #include <latch>
 #include <semaphore>
-#ifndef __clang__ // TRANSITION, GH-2862
-#include <stdatomic.h>
-#endif // TRANSITION, GH-2862
 #include <stop_token>
 #endif // _M_CEE_PURE
 

stl/inc/stdatomic.h stl/inc/__msvc_cxx_stdatomic.hppstl/inc/stdatomic.h renamed to stl/inc/__msvc_cxx_stdatomic.hpp

@@ -1,11 +1,11 @@
-// stdatomic.h standard header
+// __msvc_cxx_stdatomic.hpp internal header
 
 // Copyright (c) Microsoft Corporation.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 #pragma once
-#ifndef _STDATOMIC_H_
-#define _STDATOMIC_H_
+#ifndef __MSVC_CXX_STDATOMIC_HPP
+#define __MSVC_CXX_STDATOMIC_HPP
 
 // see _STL_COMPILER_PREPROCESSOR in yvals_core.h
 #if !defined(RC_INVOKED) && !defined(Q_MOC_RUN) && !defined(__midl)
@@ -136,4 +136,4 @@ _STL_RESTORE_CLANG_WARNINGS
 #endif // ^^^ _HAS_CXX23 ^^^
 
 #endif // !defined(RC_INVOKED) && !defined(Q_MOC_RUN) && !defined(__midl)
-#endif // _STDATOMIC_H_
+#endif // __MSVC_CXX_STDATOMIC_HPP

stl/inc/header-units.json

@@ -6,6 +6,7 @@
     "BuildAsHeaderUnits": [
         // "__msvc_all_public_headers.hpp", // for testing, not production
         "__msvc_chrono.hpp",
+        "__msvc_cxx_stdatomic.hpp",
         "__msvc_format_ucd_tables.hpp",
         "__msvc_int128.hpp",
         "__msvc_iter_core.hpp",
@@ -101,7 +102,6 @@
         "sstream",
         "stack",
         "stacktrace",
-        "stdatomic.h",
         "stdexcept",
         "stop_token",
         "streambuf",

tests/std/tests/P0943R6_stdatomic_h/test.compile.pass.cpp

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
 #ifndef __clang__ // TRANSITION, GH-2862
-#include <stdatomic.h>
+#include <__msvc_cxx_stdatomic.hpp>
 
 static_assert(ATOMIC_BOOL_LOCK_FREE == 2);
 static_assert(ATOMIC_CHAR_LOCK_FREE == 2);