[libc++] Don't try to provide source_location on AppleClang 1403

ldionne · tstellar · commit 1fa1bc9c2dff · 2023-04-04T10:51:09.000-07:00
AppleClang 1403 has some bugs that prevent std::source_location from working properly on it. Consequently, we XFAILed the unit test for source_location with that compiler. However, we should also avoid advertising that the feature is supported on that compiler, otherwise our feature-test macros lie. This was noticed to break Boost.Asio when building with a recent libc++ and AppleClang 14.0.3. rdar://106863087 Differential Revision: https://reviews.llvm.org/D146837 (cherry picked from commit c2a4238)
diff --git a/libcxx/include/__config b/libcxx/include/__config
@@ -23,6 +23,7 @@
 #endif
 
 #if defined(__apple_build_version__)
+// Given AppleClang XX.Y.Z, _LIBCPP_APPLE_CLANG_VER is XXYZ (e.g. AppleClang 14.0.3 => 1403)
 #  define _LIBCPP_COMPILER_CLANG_BASED
 #  define _LIBCPP_APPLE_CLANG_VER (__apple_build_version__ / 10000)
 #elif defined(__clang__)
diff --git a/libcxx/include/source_location b/libcxx/include/source_location
@@ -35,7 +35,8 @@ namespace std {
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#if _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location)
+#if _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location) &&                                               \
+    !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER <= 1403)
 
 class source_location {
   // The names source_location::__impl, _M_file_name, _M_function_name, _M_line, and _M_column
@@ -78,7 +79,8 @@ public:
   }
 };
 
-#endif // _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location)
+#endif // _LIBCPP_STD_VER >= 20 && __has_builtin(__builtin_source_location) && !(defined(_LIBCPP_APPLE_CLANG_VER) &&
+       // _LIBCPP_APPLE_CLANG_VER <= 1403)
 
 _LIBCPP_END_NAMESPACE_STD
 
diff --git a/libcxx/include/version b/libcxx/include/version
@@ -366,7 +366,7 @@ __cpp_lib_void_t                                        201411L <type_traits>
 # define __cpp_lib_shared_ptr_arrays                    201707L
 # define __cpp_lib_shift                                201806L
 // # define __cpp_lib_smart_ptr_for_overwrite              202002L
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER <= 1403)
 #   define __cpp_lib_source_location                    201907L
 # endif
 # define __cpp_lib_span                                 202002L
diff --git a/libcxx/test/std/language.support/support.limits/support.limits.general/source_location.version.compile.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/source_location.version.compile.pass.cpp
@@ -42,7 +42,7 @@
 
 #elif TEST_STD_VER == 20
 
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)
 #   ifndef __cpp_lib_source_location
 #     error "__cpp_lib_source_location should be defined in c++20"
 #   endif
@@ -51,13 +51,13 @@
 #   endif
 # else
 #   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location)' is not met!"
+#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)' is not met!"
 #   endif
 # endif
 
 #elif TEST_STD_VER > 20
 
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)
 #   ifndef __cpp_lib_source_location
 #     error "__cpp_lib_source_location should be defined in c++2b"
 #   endif
@@ -66,7 +66,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location)' is not met!"
+#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)' is not met!"
 #   endif
 # endif
 
diff --git a/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp b/libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
@@ -3408,7 +3408,7 @@
 #   endif
 # endif
 
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)
 #   ifndef __cpp_lib_source_location
 #     error "__cpp_lib_source_location should be defined in c++20"
 #   endif
@@ -3417,7 +3417,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location)' is not met!"
+#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)' is not met!"
 #   endif
 # endif
 
@@ -4761,7 +4761,7 @@
 #   endif
 # endif
 
-# if __has_builtin(__builtin_source_location)
+# if __has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)
 #   ifndef __cpp_lib_source_location
 #     error "__cpp_lib_source_location should be defined in c++2b"
 #   endif
@@ -4770,7 +4770,7 @@
 #   endif
 # else
 #   ifdef __cpp_lib_source_location
-#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location)' is not met!"
+#     error "__cpp_lib_source_location should not be defined when the requirement '__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)' is not met!"
 #   endif
 # endif
 
diff --git a/libcxx/test/support/test_macros.h b/libcxx/test/support/test_macros.h
@@ -78,7 +78,8 @@
 #endif
 
 #if defined(__apple_build_version__)
-#define TEST_APPLE_CLANG_VER (__clang_major__ * 100) + __clang_minor__
+// Given AppleClang XX.Y.Z, TEST_APPLE_CLANG_VER is XXYZ (e.g. AppleClang 14.0.3 => 1403)
+#define TEST_APPLE_CLANG_VER (__apple_build_version__ / 10000)
 #elif defined(__clang_major__)
 #define TEST_CLANG_VER (__clang_major__ * 100) + __clang_minor__
 #elif defined(__GNUC__)
diff --git a/libcxx/utils/generate_feature_test_macro_components.py b/libcxx/utils/generate_feature_test_macro_components.py
@@ -648,8 +648,8 @@ def add_version_header(tc):
     "name": "__cpp_lib_source_location",
     "values": { "c++20": 201907 },
     "headers": ["source_location"],
-    "test_suite_guard": "__has_builtin(__builtin_source_location)",
-    "libcxx_guard": "__has_builtin(__builtin_source_location)",
+    "test_suite_guard": "__has_builtin(__builtin_source_location) && !(defined(TEST_APPLE_CLANG_VER) && TEST_APPLE_CLANG_VER <= 1403)",
+    "libcxx_guard": "__has_builtin(__builtin_source_location) && !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER <= 1403)",
   }, {
     "name": "__cpp_lib_span",
     "values": { "c++20": 202002 },
