CompileFeatures: Now able to presume full language level support

Previously compilers that only supported the meta-level flags
would not have any of the granular features listed. Now we
presume that they have full support and enable all the features.

Update granular feature tests to skip the actual compilation
checks for the presumed features.

Modules/Compiler/Cray-CXX.cmake

@@ -10,13 +10,16 @@ string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " -DNDEBUG")
 if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 8.1)
   set(CMAKE_CXX98_STANDARD_COMPILE_OPTION  -h conform)
   set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION -h gnu)
+  set(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT ON)
   if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.4)
     set(CMAKE_CXX11_STANDARD_COMPILE_OPTION  -h std=c++11)
     set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION -h std=c++11,gnu)
+    set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)
   endif()
   if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.6)
     set(CMAKE_CXX14_STANDARD_COMPILE_OPTION  -h std=c++14)
     set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION -h std=c++14,gnu)
+    set(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT ON)
   endif ()
 endif ()
 

Modules/Compiler/PGI-CXX.cmake

@@ -6,15 +6,19 @@ string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " -DNDEBUG")
 if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 12.10)
   set(CMAKE_CXX98_STANDARD_COMPILE_OPTION  -A)
   set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION --gnu_extensions)
+  set(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT ON)
   if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 13.10)
     set(CMAKE_CXX11_STANDARD_COMPILE_OPTION  --c++11 -A)
     set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION --c++11 --gnu_extensions)
+    set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)
     if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 15.7)
       set(CMAKE_CXX14_STANDARD_COMPILE_OPTION  --c++14 -A)
       set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION --c++14 --gnu_extensions)
+      set(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT ON)
       if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 17.1)
         set(CMAKE_CXX17_STANDARD_COMPILE_OPTION  --c++17 -A)
         set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION --c++17 --gnu_extensions)
+        set(CMAKE_CXX17_STANDARD__HAS_FULL_SUPPORT ON)
       endif()
     endif()
   endif()

Modules/Compiler/XL-CXX.cmake

@@ -16,6 +16,8 @@ if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
   endif()
   set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-qlanglvl=extended0x")
   set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
+  set(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT ON)
+  set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)
 endif ()
 
 __compiler_check_default_language_standard(CXX 10.1 98)

Modules/Compiler/XLClang-CXX.cmake

@@ -4,13 +4,16 @@ __compiler_xlclang(CXX)
 if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 13.1.1)
   set(CMAKE_CXX98_STANDARD_COMPILE_OPTION  "")
   set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "")
+  set(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT ON)
   set(CMAKE_CXX11_STANDARD_COMPILE_OPTION  "-qlanglvl=extended0x")
   set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
+  set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)
   if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 13.1.2)
     set(CMAKE_CXX11_STANDARD_COMPILE_OPTION  "-std=c++11")
     set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++11")
     set(CMAKE_CXX14_STANDARD_COMPILE_OPTION  "-std=c++1y")
     set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++1y")
+    set(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT ON)
   endif ()
 endif()
 

Tests/CompileFeatures/CMakeLists.txt

@@ -15,17 +15,21 @@ macro(run_test feature lang)
   endif()
 endmacro()
 
-get_property(c_features GLOBAL PROPERTY CMAKE_C_KNOWN_FEATURES)
-list(FILTER c_features EXCLUDE REGEX "^c_std_[0-9][0-9]")
-foreach(feature ${c_features})
-  run_test(${feature} C)
-endforeach()
+if(NOT CMAKE_C_COMPILER_ID MATCHES "^(Cray|PGI|XL|XLClang)$")
+  get_property(c_features GLOBAL PROPERTY CMAKE_C_KNOWN_FEATURES)
+  list(FILTER c_features EXCLUDE REGEX "^c_std_[0-9][0-9]")
+  foreach(feature ${c_features})
+    run_test(${feature} C)
+  endforeach()
+endif()
 
-get_property(cxx_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
-list(FILTER cxx_features EXCLUDE REGEX "^cxx_std_[0-9][0-9]")
-foreach(feature ${cxx_features})
-  run_test(${feature} CXX)
-endforeach()
+if(NOT CMAKE_CXX_COMPILER_ID MATCHES "^(Cray|PGI|XL|XLClang)$")
+  get_property(cxx_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
+  list(FILTER cxx_features EXCLUDE REGEX "^cxx_std_[0-9][0-9]")
+  foreach(feature ${cxx_features})
+    run_test(${feature} CXX)
+  endforeach()
+endif()
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang"
     AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1)

Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt

@@ -52,8 +52,10 @@ endmacro()
 # detailed features tables, not just meta-features
 
 if (CMAKE_C_COMPILE_FEATURES)
-  set(C_expected_features ${CMAKE_C_COMPILE_FEATURES})
-  list(FILTER C_expected_features EXCLUDE REGEX "^c_std_[0-9][0-9]")
+  if(NOT CMAKE_C_COMPILER_ID MATCHES "^(Cray|PGI|XL|XLClang)$")
+    set(C_expected_features ${CMAKE_C_COMPILE_FEATURES})
+    list(FILTER C_expected_features EXCLUDE REGEX "^c_std_[0-9][0-9]")
+  endif()
 endif()
 if (C_expected_features)
   string(REGEX REPLACE "^([0-9]+)\\.[0-9]+\\.[0-9]+.*" "\\1" COMPILER_VERSION_MAJOR "${CMAKE_C_COMPILER_VERSION}")
@@ -93,8 +95,10 @@ if (C_expected_features)
 endif()
 
 if (CMAKE_CXX_COMPILE_FEATURES)
-  set(CXX_expected_features ${CMAKE_CXX_COMPILE_FEATURES})
-  list(FILTER CXX_expected_features EXCLUDE REGEX "^cxx_std_[0-9][0-9]")
+  if(NOT CMAKE_CXX_COMPILER_ID MATCHES "^(Cray|PGI|XL|XLClang)$")
+    set(CXX_expected_features ${CMAKE_CXX_COMPILE_FEATURES})
+    list(FILTER CXX_expected_features EXCLUDE REGEX "^cxx_std_[0-9][0-9]")
+  endif()
 endif()
 if (NOT CXX_expected_features)
   file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp"