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.

6 files changed, 34 insertions, 14 deletions

diff --git a/Modules/Compiler/Cray-CXX.cmake b/Modules/Compiler/Cray-CXX.cmake
index 85a3167..38c8b1e 100644
--- a/Modules/Compiler/Cray-CXX.cmake
+++ b/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 ()
 
diff --git a/Modules/Compiler/PGI-CXX.cmake b/Modules/Compiler/PGI-CXX.cmake
index 35076bb..c77de36 100644
--- a/Modules/Compiler/PGI-CXX.cmake
+++ b/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()
diff --git a/Modules/Compiler/XL-CXX.cmake b/Modules/Compiler/XL-CXX.cmake
index 0026b4a..ec3f1f8 100644
--- a/Modules/Compiler/XL-CXX.cmake
+++ b/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)
diff --git a/Modules/Compiler/XLClang-CXX.cmake b/Modules/Compiler/XLClang-CXX.cmake
index f535ebc..03c7c7b 100644
--- a/Modules/Compiler/XLClang-CXX.cmake
+++ b/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()
 
diff --git a/Tests/CompileFeatures/CMakeLists.txt b/Tests/CompileFeatures/CMakeLists.txt
index 6ccdcc3..2dd8917 100644
--- a/Tests/CompileFeatures/CMakeLists.txt
+++ b/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)
diff --git a/Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt b/Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt
index b584e16..cffef5a 100644
--- a/Tests/Module/WriteCompilerDetectionHeader/CMakeLists.txt
+++ b/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"