Merge topic 'cpp23'

9f3c70a333 CUDA, CXX, OBJCXX: C++23 support with Clang 12
af7e1545c8 CUDA, CXX: Remove HAS_FULL_SUPPORT for C++17 and 20

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5576

3 files changed, 18 insertions, 31 deletions

diff --git a/Modules/Compiler/CMakeCommonCompilerMacros.cmake b/Modules/Compiler/CMakeCommonCompilerMacros.cmake
index 409b65a..cd897c5 100644
--- a/Modules/Compiler/CMakeCommonCompilerMacros.cmake
+++ b/Modules/Compiler/CMakeCommonCompilerMacros.cmake
@@ -93,21 +93,14 @@ endmacro()
 # Define to allow compile features to be automatically determined
 macro(cmake_record_cxx_compile_features)
   set(_result 0)
+  if(_result EQUAL 0 AND DEFINED CMAKE_CXX23_STANDARD_COMPILE_OPTION)
+    _has_compiler_features_cxx(23)
+  endif()
   if(_result EQUAL 0 AND DEFINED CMAKE_CXX20_STANDARD_COMPILE_OPTION)
-    if(CMAKE_CXX20_STANDARD__HAS_FULL_SUPPORT)
-      _has_compiler_features_cxx(20)
-    else()
-      _record_compiler_features_cxx(20)
-    endif()
-    unset(CMAKE_CXX20_STANDARD__HAS_FULL_SUPPORT)
+    _has_compiler_features_cxx(20)
   endif()
   if(_result EQUAL 0 AND DEFINED CMAKE_CXX17_STANDARD_COMPILE_OPTION)
-    if(CMAKE_CXX17_STANDARD__HAS_FULL_SUPPORT)
-      _has_compiler_features_cxx(17)
-    else()
-      _record_compiler_features_cxx(17)
-    endif()
-    unset(CMAKE_CXX17_STANDARD__HAS_FULL_SUPPORT)
+    _has_compiler_features_cxx(17)
   endif()
   if(_result EQUAL 0 AND DEFINED CMAKE_CXX14_STANDARD_COMPILE_OPTION)
     if(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT)
@@ -137,21 +130,14 @@ endmacro()
 
 macro(cmake_record_cuda_compile_features)
   set(_result 0)
+  if(_result EQUAL 0 AND DEFINED CMAKE_CUDA23_STANDARD_COMPILE_OPTION)
+    _has_compiler_features_cuda(23)
+  endif()
   if(_result EQUAL 0 AND DEFINED CMAKE_CUDA20_STANDARD_COMPILE_OPTION)
-    if(CMAKE_CUDA20_STANDARD__HAS_FULL_SUPPORT)
-      _has_compiler_features_cuda(20)
-    else()
-      _record_compiler_features_cuda(20)
-    endif()
-    unset(CMAKE_CUDA20_STANDARD__HAS_FULL_SUPPORT)
+    _has_compiler_features_cuda(20)
   endif()
   if(_result EQUAL 0 AND DEFINED CMAKE_CUDA17_STANDARD_COMPILE_OPTION)
-    if(CMAKE_CUDA17_STANDARD__HAS_FULL_SUPPORT)
-      _has_compiler_features_cuda(17)
-    else()
-      _record_compiler_features_cuda(17)
-    endif()
-    unset(CMAKE_CUDA17_STANDARD__HAS_FULL_SUPPORT)
+    _has_compiler_features_cuda(17)
   endif()
   if(_result EQUAL 0 AND DEFINED CMAKE_CUDA14_STANDARD_COMPILE_OPTION)
     if(CMAKE_CUDA14_STANDARD__HAS_FULL_SUPPORT)
diff --git a/Modules/Compiler/Clang.cmake b/Modules/Compiler/Clang.cmake
index 27692c2..9f900df 100644
--- a/Modules/Compiler/Clang.cmake
+++ b/Modules/Compiler/Clang.cmake
@@ -155,10 +155,6 @@ macro(__compiler_clang_cxx_standards lang)
       set(CMAKE_${lang}17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
     endif()
 
-    if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 6.0)
-      set(CMAKE_${lang}17_STANDARD__HAS_FULL_SUPPORT ON)
-    endif()
-
     if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 11.0)
       set(CMAKE_${lang}20_STANDARD_COMPILE_OPTION "-std=c++20")
       set(CMAKE_${lang}20_EXTENSION_COMPILE_OPTION "-std=gnu++20")
@@ -169,6 +165,11 @@ macro(__compiler_clang_cxx_standards lang)
 
     unset(_clang_version_std17)
 
+    if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 12.0)
+      set(CMAKE_${lang}23_STANDARD_COMPILE_OPTION "-std=c++2b")
+      set(CMAKE_${lang}23_EXTENSION_COMPILE_OPTION "-std=gnu++2b")
+    endif()
+
     if("x${CMAKE_${lang}_SIMULATE_ID}" STREQUAL "xMSVC")
       # The MSVC standard library requires C++14, and MSVC itself has no
       # notion of operating in a mode not aware of at least that standard.
@@ -180,8 +181,6 @@ macro(__compiler_clang_cxx_standards lang)
       # This clang++ is missing some features because of MSVC compatibility.
       unset(CMAKE_${lang}11_STANDARD__HAS_FULL_SUPPORT)
       unset(CMAKE_${lang}14_STANDARD__HAS_FULL_SUPPORT)
-      unset(CMAKE_${lang}17_STANDARD__HAS_FULL_SUPPORT)
-      unset(CMAKE_${lang}20_STANDARD__HAS_FULL_SUPPORT)
     endif()
 
     __compiler_check_default_language_standard(${lang} 2.1 98)
@@ -221,6 +220,8 @@ macro(__compiler_clang_cxx_standards lang)
     set(CMAKE_${lang}17_EXTENSION_COMPILE_OPTION "")
     set(CMAKE_${lang}20_STANDARD_COMPILE_OPTION "")
     set(CMAKE_${lang}20_EXTENSION_COMPILE_OPTION "")
+    set(CMAKE_${lang}23_STANDARD_COMPILE_OPTION "")
+    set(CMAKE_${lang}23_EXTENSION_COMPILE_OPTION "")
 
     # There is no meaningful default for this
     set(CMAKE_${lang}_STANDARD_DEFAULT "")
@@ -236,6 +237,7 @@ macro(__compiler_clang_cxx_standards lang)
         cxx_std_14
         cxx_std_17
         cxx_std_20
+        cxx_std_23
         )
       _record_compiler_features(${lang} "" CMAKE_${lang}_COMPILE_FEATURES)
     endmacro()
diff --git a/Modules/Compiler/PGI-CXX.cmake b/Modules/Compiler/PGI-CXX.cmake
index 2d7a303..3254353 100644
--- a/Modules/Compiler/PGI-CXX.cmake
+++ b/Modules/Compiler/PGI-CXX.cmake
@@ -18,7 +18,6 @@ if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 12.10)
       if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 17.1)
         set(CMAKE_CXX17_STANDARD_COMPILE_OPTION  --c++17)
         set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION --c++17 --gnu_extensions)
-        set(CMAKE_CXX17_STANDARD__HAS_FULL_SUPPORT ON)
       endif()
     endif()
   endif()