Add Clang support

test/core_name/Jamfile.v2

@@ -12,7 +12,7 @@ import python ;
 import testing ;
 import ../../config/checks/config : requires ;
 
-########## BEGIN of helpers to detect C++20 non-type template args support
+########## BEGIN of helpers to detect C++20 features support
 
 actions mp_simple_run_action
 {
@@ -31,17 +31,16 @@ rule mp-run-simple ( sources + : args * : input-files * : requirements * : targe
 mp-run-simple cxx20_nontype_template_args_detection.cpp : : : : compiler_supports_cxx20_nontype_template_args ;
 explicit compiler_supports_cxx20_nontype_template_args ;
 
-########## END of helpers to detect C++20 non-type template args support
+mp-run-simple cxx20_clang_workaround_detection.cpp : : : : compiler_supports_cxx20_clang_workaround ;
+explicit compiler_supports_cxx20_clang_workaround ;
 
-local REQUIRE_CXX20_NONTYPE_TEMPLATE_ARGS =
-    [ check-target-builds ../core_name//compiler_supports_cxx20_nontype_template_args : : <build>no ]
-  ;
+########## END of helpers to detect C++20 features support
 
 project
     : source-location .
     : requirements
         <define>BOOST_PFR_DETAIL_STRICT_RVALUE_TESTING=1
-        [ check-target-builds ../core_name//compiler_supports_cxx20_nontype_template_args : : <build>no ]
+        [ check-target-builds ../core_name//compiler_supports_cxx20_nontype_template_args : : [ check-target-builds ../core_name//compiler_supports_cxx20_clang_workaround : : <build>no ] ]
     ;
 
 

test/core_name/cxx20_clang_workaround_detection.cpp

@@ -0,0 +1,32 @@
+// Copyright (c) 2023 Bela Schaum, X-Ryl669, Denis Mikhailov.
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+
+// Initial implementation by Bela Schaum, https://github.com/schaumb
+// The way to make it union and UB free by X-Ryl669, https://github.com/X-Ryl669
+//
+
+template <auto p>
+class X {};
+
+template <class T>
+struct Store
+{
+    T v;
+};
+
+template <class T>
+Store(T) -> Store<T>;
+
+struct S
+{
+    int m;
+} s;
+
+X<Store{&s.m}> x4;
+
+int main() {}
+
+

test/core_name/fields_names.cpp

@@ -16,8 +16,6 @@
 
 namespace testing {
 
-namespace {
-
 struct nonconstexpr {
     nonconstexpr() {};
 };
@@ -67,9 +65,6 @@ void test_names_as_array() {
 }
 
 
-} // anonymous namespace
-
-
 } // namespace testing
 
 int main() {

test/core_name/fields_names_nonascii.cpp.tpl

@@ -14,8 +14,6 @@
 
 namespace testing {
 
-namespace {
-
 struct Aggregate {
     int _%ARG%;
 };
@@ -35,8 +33,6 @@ void test_names_as_array() {
     }
 }
 
-} // anonymous namespace
-
 
 } // namespace testing