XL: Add C and C++ language level flags

Modules/Compiler/XL-C.cmake

@@ -3,5 +3,50 @@ __compiler_xl(C)
 string(APPEND CMAKE_C_FLAGS_RELEASE_INIT " -DNDEBUG")
 string(APPEND CMAKE_C_FLAGS_MINSIZEREL_INIT " -DNDEBUG")
 
-# -qthreaded     = Ensures that all optimizations will be thread-safe
+# -qthreaded = Ensures that all optimizations will be thread-safe
 string(APPEND CMAKE_C_FLAGS_INIT " -qthreaded")
+
+# XL v13.1.1 for Linux ppc64 little-endian switched to using a clang based
+# front end and accepts the -std= option while only reserving -qlanglevel= for
+# compatibility.  All other versions (previous versions on Linux ppc64
+# 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")
+  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")
+    set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-qlanglvl=extc99")
+    if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 12.1)
+      set(CMAKE_C11_STANDARD_COMPILE_OPTION "-qlanglvl=extc1x")
+      set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-qlanglvl=extc1x")
+    endif ()
+  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 ()

Modules/Compiler/XL-CXX.cmake

@@ -3,8 +3,60 @@ __compiler_xl(CXX)
 string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " -DNDEBUG")
 string(APPEND CMAKE_CXX_FLAGS_MINSIZEREL_INIT " -DNDEBUG")
 
-# -qthreaded     = Ensures that all optimizations will be thread-safe
+# -qthreaded = Ensures that all optimizations will be thread-safe
 string(APPEND CMAKE_CXX_FLAGS_INIT " -qthreaded")
 
+# XL v13.1.1 for Linux ppc64 little-endian switched to using a clang based
+# front end and accepts the -std= option while only reserving -qlanglevel= for
+# compatibility.  All other versions (previous versions on Linux ppc64
+# 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")
+    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)
+      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)
+    set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-qlanglvl=strict98")
+    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 ()
+
 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 ()