Merge topic 'port-language-default-to-common-macro'

d9089876 AppleClang: Use common compiler macros for language standard default 174c02e1 SunPro: Use common compiler macros for language standard default 08fa2ba8 Clang: Use common compiler macros for language standard default 0198502f Intel: Use common compiler macros for language standard default d1aa2b3f GNU: Use common compiler macros for language standard default 87b9d6d9 XL: Use common compiler macros for language standard default Acked-by: Kitware Robot <kwrobot@kitware.com> Merge-request: !787
2026-02-21 14:40:26 -06:00 · 2017-05-03 15:00:59 +00:00
parent f1e91c694b d908987634
commit bf3c08d648
16 changed files with 69 additions and 174 deletions
--- a/Modules/Compiler/AppleClang-C.cmake
+++ b/Modules/Compiler/AppleClang-C.cmake
@@ -12,17 +12,7 @@ if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.0)
  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
 endif()

-if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.0)
-  if (NOT CMAKE_C_COMPILER_FORCED)
-    if (NOT CMAKE_C_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_C_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_C_COMPILER_ID} (${CMAKE_C_COMPILER}) version ${CMAKE_C_COMPILER_VERSION}")
-    endif()
-    set(CMAKE_C_STANDARD_DEFAULT ${CMAKE_C_STANDARD_COMPUTED_DEFAULT})
-  elseif(NOT DEFINED CMAKE_C_STANDARD_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    set(CMAKE_C_STANDARD_DEFAULT 99)
-  endif()
-endif()
+__compiler_check_default_language_standard(C 4.0 99)

 macro(cmake_record_c_compile_features)
  set(_result 0)
--- a/Modules/Compiler/AppleClang-CXX.cmake
+++ b/Modules/Compiler/AppleClang-CXX.cmake
@@ -27,18 +27,7 @@ if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.1)
  set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
 endif()

-if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.0)
-  if (NOT CMAKE_CXX_COMPILER_FORCED)
-    if (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_CXX_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER}) version ${CMAKE_CXX_COMPILER_VERSION}")
-    endif()
-    set(CMAKE_CXX_STANDARD_DEFAULT ${CMAKE_CXX_STANDARD_COMPUTED_DEFAULT})
-  elseif(NOT DEFINED CMAKE_CXX_STANDARD_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    set(CMAKE_CXX_STANDARD_DEFAULT 98)
-  endif()
-endif()
-
+__compiler_check_default_language_standard(CXX 4.0 98)

 macro(cmake_record_cxx_compile_features)
  set(_result 0)
--- a/Modules/Compiler/Clang-C.cmake
+++ b/Modules/Compiler/Clang-C.cmake
@@ -17,21 +17,7 @@ if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
 endif()

-if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
-  if (NOT CMAKE_C_COMPILER_FORCED)
-    if (NOT CMAKE_C_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_C_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_C_COMPILER_ID} (${CMAKE_C_COMPILER}) version ${CMAKE_C_COMPILER_VERSION}")
-    endif()
-    set(CMAKE_C_STANDARD_DEFAULT ${CMAKE_C_STANDARD_COMPUTED_DEFAULT})
-  elseif(NOT DEFINED CMAKE_C_STANDARD_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.6)
-      set(CMAKE_C_STANDARD_DEFAULT 11)
-    else()
-      set(CMAKE_C_STANDARD_DEFAULT 99)
-    endif()
-  endif()
-endif()
+__compiler_check_default_language_standard(C 3.4 99 3.6 11)

 macro(cmake_record_c_compile_features)
  set(_result 0)
--- a/Modules/Compiler/Clang-CXX.cmake
+++ b/Modules/Compiler/Clang-CXX.cmake
@@ -36,17 +36,7 @@ if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5)
  set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
 endif()

-if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
-  if (NOT CMAKE_CXX_COMPILER_FORCED)
-    if (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_CXX_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER}) version ${CMAKE_CXX_COMPILER_VERSION}")
-    endif()
-    set(CMAKE_CXX_STANDARD_DEFAULT ${CMAKE_CXX_STANDARD_COMPUTED_DEFAULT})
-  elseif(NOT DEFINED CMAKE_CXX_STANDARD_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    set(CMAKE_CXX_STANDARD_DEFAULT 98)
-  endif()
-endif()
+__compiler_check_default_language_standard(CXX 3.1 98)

 macro(cmake_record_cxx_compile_features)
  set(_result 0)
--- a/Modules/Compiler/Clang.cmake
+++ b/Modules/Compiler/Clang.cmake
@@ -8,6 +8,8 @@ if(__COMPILER_CLANG)
 endif()
 set(__COMPILER_CLANG 1)

+include(Compiler/CMakeCommonCompilerMacros)
+
 if("x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC"
    OR "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
  macro(__compiler_clang lang)
--- a/Modules/Compiler/GNU-C.cmake
+++ b/Modules/Compiler/GNU-C.cmake
@@ -22,21 +22,7 @@ elseif (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.6)
  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu1x")
 endif()

-if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
-  if (NOT CMAKE_C_COMPILER_FORCED)
-    if (NOT CMAKE_C_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_C_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_C_COMPILER_ID} (${CMAKE_C_COMPILER}) version ${CMAKE_C_COMPILER_VERSION}")
-    endif()
-    set(CMAKE_C_STANDARD_DEFAULT ${CMAKE_C_STANDARD_COMPUTED_DEFAULT})
-  elseif(NOT DEFINED CMAKE_C_STANDARD_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 5.0)
-      set(CMAKE_C_STANDARD_DEFAULT 11)
-    else()
-      set(CMAKE_C_STANDARD_DEFAULT 90)
-    endif()
-  endif()
-endif()
+__compiler_check_default_language_standard(C 3.4 90 5.0 11)

 macro(cmake_record_c_compile_features)
  set(_result 0)
--- a/Modules/Compiler/GNU-CXX.cmake
+++ b/Modules/Compiler/GNU-CXX.cmake
@@ -38,17 +38,7 @@ if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.1)
  set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++1z")
 endif()

-if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
-  if (NOT CMAKE_CXX_COMPILER_FORCED)
-    if (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_CXX_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER}) version ${CMAKE_CXX_COMPILER_VERSION}")
-    endif()
-    set(CMAKE_CXX_STANDARD_DEFAULT ${CMAKE_CXX_STANDARD_COMPUTED_DEFAULT})
-  elseif(NOT DEFINED CMAKE_CXX_STANDARD_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    set(CMAKE_CXX_STANDARD_DEFAULT 98)
-  endif()
-endif()
+__compiler_check_default_language_standard(CXX 4.4 98 6.0 14)

 macro(cmake_record_cxx_compile_features)
  set(_result 0)
--- a/Modules/Compiler/GNU.cmake
+++ b/Modules/Compiler/GNU.cmake
@@ -8,6 +8,8 @@ if(__COMPILER_GNU)
 endif()
 set(__COMPILER_GNU 1)

+include(Compiler/CMakeCommonCompilerMacros)
+
 macro(__compiler_gnu lang)
  # Feature flags.
  set(CMAKE_${lang}_VERBOSE_FLAG "-v")
--- a/Modules/Compiler/Intel-C.cmake
+++ b/Modules/Compiler/Intel-C.cmake
@@ -30,25 +30,11 @@ if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 12.0)
  set(CMAKE_C99_EXTENSION_COMPILE_OPTION "${_std}=${_ext}99")
 endif()

-if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 12.1)
-  if (NOT CMAKE_C_COMPILER_FORCED)
-    if (NOT CMAKE_C_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_C_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_C_COMPILER_ID} (${CMAKE_C_COMPILER}) version ${CMAKE_C_COMPILER_VERSION}")
-    endif()
-    set(CMAKE_C_STANDARD_DEFAULT ${CMAKE_C_STANDARD_COMPUTED_DEFAULT})
-  elseif(NOT DEFINED CMAKE_C_STANDARD_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 15.0.0)
-      set(CMAKE_C_STANDARD_DEFAULT 11)
-    else()
-      set(CMAKE_C_STANDARD_DEFAULT 90)
-    endif()
-  endif()
-endif()
-
 unset(_std)
 unset(_ext)

+__compiler_check_default_language_standard(C 12.1 90 15.0.0 11)
+
 macro(cmake_record_c_compile_features)
  set(_result 0)
  if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 12.1)
--- a/Modules/Compiler/Intel-CXX.cmake
+++ b/Modules/Compiler/Intel-CXX.cmake
@@ -47,22 +47,11 @@ if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12.1)
  endif()
 endif()

-if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12.1)
-  if (NOT CMAKE_CXX_COMPILER_FORCED)
-    if (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_CXX_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER}) version ${CMAKE_CXX_COMPILER_VERSION}")
-    else()
-      set(CMAKE_CXX_STANDARD_DEFAULT ${CMAKE_CXX_STANDARD_COMPUTED_DEFAULT})
-    endif()
-  elseif (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    set(CMAKE_CXX_STANDARD_DEFAULT 98)
-  endif()
-endif()
-
 unset(_std)
 unset(_ext)

+__compiler_check_default_language_standard(CXX 12.1 98)
+
 macro(cmake_record_cxx_compile_features)
  set(_result 0)
  if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12.1)
--- a/Modules/Compiler/Intel.cmake
+++ b/Modules/Compiler/Intel.cmake
@@ -8,6 +8,8 @@ if(__COMPILER_INTEL)
 endif()
 set(__COMPILER_INTEL 1)

+include(Compiler/CMakeCommonCompilerMacros)
+
 if(CMAKE_HOST_WIN32)
  # MSVC-like
  macro(__compiler_intel lang)
--- a/Modules/Compiler/SunPro-CXX.cmake
+++ b/Modules/Compiler/SunPro-CXX.cmake
@@ -1,3 +1,8 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+include(Compiler/SunPro)
+
 set(CMAKE_CXX_VERBOSE_FLAG "-v")

 set(CMAKE_CXX_COMPILE_OPTIONS_PIC -KPIC)
@@ -39,17 +44,7 @@ if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.13)
  set(CMAKE_CXX_LINK_WITH_STANDARD_COMPILE_OPTION 1)
 endif()

-if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.13)
-  if (NOT CMAKE_CXX_COMPILER_FORCED)
-    if (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_CXX_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER}) version ${CMAKE_CXX_COMPILER_VERSION}")
-    endif()
-    set(CMAKE_CXX_STANDARD_DEFAULT ${CMAKE_CXX_STANDARD_COMPUTED_DEFAULT})
-  elseif(NOT DEFINED CMAKE_CXX_STANDARD_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    set(CMAKE_CXX_STANDARD_DEFAULT 98)
-  endif()
-endif()
+__compiler_check_default_language_standard(CXX 5.13 98)

 macro(cmake_record_cxx_compile_features)
  set(_result 0)
--- a/Modules/Compiler/SunPro.cmake
+++ b/Modules/Compiler/SunPro.cmake
@@ -0,0 +1,10 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+# This module is shared by multiple languages; use include blocker.
+if(__COMPILER_SUNPRO)
+  return()
+endif()
+set(__COMPILER_SUNPRO 1)
+
+include(Compiler/CMakeCommonCompilerMacros)
--- a/Modules/Compiler/XL-C.cmake
+++ b/Modules/Compiler/XL-C.cmake
@@ -12,21 +12,21 @@ string(APPEND CMAKE_C_FLAGS_INIT " -qthreaded")
 # little-endian, all versions on Linux ppc64 big-endian, all versions on AIX
 # and BGQ, etc) are derived from the UNIX compiler and only accept the
 # -qlanglvl option.
-if (CMAKE_SYSTEM MATCHES "Linux.*ppc64le" AND
-    CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 13.1.1)
-  set(CMAKE_C90_STANDARD_COMPILE_OPTION  "-std=c89")
-  set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu89")
-  set(CMAKE_C99_STANDARD_COMPILE_OPTION  "-std=c99")
-  set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
-  if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 13.1.2)
-    set(CMAKE_C11_STANDARD_COMPILE_OPTION  "-std=c11")
-    set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
+if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
+  if (CMAKE_SYSTEM MATCHES "Linux.*ppc64le" AND
+      CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 13.1.1)
+    set(CMAKE_C90_STANDARD_COMPILE_OPTION  "-std=c89")
+    set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu89")
+    set(CMAKE_C99_STANDARD_COMPILE_OPTION  "-std=c99")
+    set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
+    if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 13.1.2)
+      set(CMAKE_C11_STANDARD_COMPILE_OPTION  "-std=c11")
+      set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
+    else ()
+      set(CMAKE_C11_STANDARD_COMPILE_OPTION "-qlanglvl=extc1x")
+      set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-qlanglvl=extc1x")
+    endif ()
  else ()
-    set(CMAKE_C11_STANDARD_COMPILE_OPTION "-qlanglvl=extc1x")
-    set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-qlanglvl=extc1x")
-  endif ()
-else ()
-  if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
    set(CMAKE_C90_STANDARD_COMPILE_OPTION "-qlanglvl=stdc89")
    set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-qlanglvl=extc89")
    set(CMAKE_C99_STANDARD_COMPILE_OPTION "-qlanglvl=stdc99")
@@ -38,15 +38,4 @@ else ()
  endif ()
 endif()

-if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
-  if (NOT CMAKE_C_COMPILER_FORCED)
-    if (NOT CMAKE_C_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_C_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_C_COMPILER_ID} (${CMAKE_C_COMPILER}) version ${CMAKE_C_COMPILER_VERSION}")
-    else ()
-      set(CMAKE_C_STANDARD_DEFAULT ${CMAKE_C_STANDARD_COMPUTED_DEFAULT})
-    endif ()
-  elseif (NOT CMAKE_C_STANDARD_COMPUTED_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    set(CMAKE_C_STANDARD_DEFAULT 90)
-  endif ()
-endif ()
+__compiler_check_default_language_standard(C 10.1 90)
--- a/Modules/Compiler/XL-CXX.cmake
+++ b/Modules/Compiler/XL-CXX.cmake
@@ -12,32 +12,30 @@ string(APPEND CMAKE_CXX_FLAGS_INIT " -qthreaded")
 # little-endian, all versions on Linux ppc64 big-endian, all versions on AIX
 # and BGQ, etc) are derived from the UNIX compiler and only accept the
 # -qlanglvl option.
-if (CMAKE_SYSTEM MATCHES "Linux.*ppc64")
-  if (CMAKE_SYSTEM MATCHES "Linux.*ppc64le" AND
-      CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 13.1.1)
-    set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-std=c++98")
-    set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
-    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 "-qlanglvl=extended1y")
+if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
+  if (CMAKE_SYSTEM MATCHES "Linux.*ppc64")
+    if (CMAKE_SYSTEM MATCHES "Linux.*ppc64le" AND
+        CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 13.1.1)
+      set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-std=c++98")
+      set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
+      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 "-qlanglvl=extended1y")
+      else ()
+        set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-qlanglvl=extended0x")
+        set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
+      endif ()
    else ()
-      set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-qlanglvl=extended0x")
-      set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
-    endif ()
-  else ()
-    # The non-clang based Linux ppc64 compiler, both big-endian and
-    # little-endian lacks, the non-extension language level flags
-    if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
+      # The non-clang based Linux ppc64 compiler, both big-endian and
+      # little-endian lacks, the non-extension language level flags
      set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-qlanglvl=extended")
      set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-qlanglvl=extended")
      set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-qlanglvl=extended0x")
      set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
    endif ()
-  endif ()
-else ()
-  if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
+  else ()
    set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-qlanglvl=strict98")
    set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-qlanglvl=extended")
    set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-qlanglvl=extended0x")
@@ -45,18 +43,7 @@ else ()
  endif ()
 endif ()

+__compiler_check_default_language_standard(CXX 10.1 98)
+
 set(CMAKE_CXX_COMPILE_OBJECT
  "<CMAKE_CXX_COMPILER> -+ <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT> -c <SOURCE>")
-
-if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
-  if (NOT CMAKE_CXX_COMPILER_FORCED)
-    if (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
-      message(FATAL_ERROR "CMAKE_CXX_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER}) version ${CMAKE_CXX_COMPILER_VERSION}")
-    else ()
-      set(CMAKE_CXX_STANDARD_DEFAULT ${CMAKE_CXX_STANDARD_COMPUTED_DEFAULT})
-    endif ()
-  elseif (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
-    # Compiler id was forced so just guess the default standard level.
-    set(CMAKE_CXX_STANDARD_DEFAULT 98)
-  endif ()
-endif ()
--- a/Modules/Compiler/XL.cmake
+++ b/Modules/Compiler/XL.cmake
@@ -8,6 +8,8 @@ if(__COMPILER_XL)
 endif()
 set(__COMPILER_XL 1)

+include(Compiler/CMakeCommonCompilerMacros)
+
 # Find the CreateExportList program that comes with this toolchain.
 find_program(CMAKE_XL_CreateExportList
  NAMES CreateExportList