Merge topic 'add-xlclang'

d9d285c5ad jsoncpp: Fix include order for build within CMake
0d489fab19 libuv: fix atomic ops compilation with xlclang
1699f5c231 Utilities: Suppress warnings in third-party code when using XLClang
f709089d84 XLClang: Extract compiler implicit include directories
5c41386357 XLClang: Add policy CMP0089 to present as XL for compatibility
8278237933 XL: Remove overlap with the new XLClang compiler ID
6f5cf2d2c6 XL: Revert "Recognize compilers identified by __ibmxl__"
90c6156aa8 XLClang: Add a new compiler ID for the clang-based XL compiler
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !2921

40 files changed, 329 insertions, 125 deletions

diff --git a/Help/manual/cmake-policies.7.rst b/Help/manual/cmake-policies.7.rst
index 409b5b1..9470d6c 100644
--- a/Help/manual/cmake-policies.7.rst
+++ b/Help/manual/cmake-policies.7.rst
@@ -51,6 +51,14 @@ The :variable:`CMAKE_MINIMUM_REQUIRED_VERSION` variable may also be used
 to determine whether to report an error on use of deprecated macros or
 functions.
 
+Policies Introduced by CMake 3.15
+=================================
+
+.. toctree::
+   :maxdepth: 1
+
+   CMP0089: Compiler id for IBM Clang-based XL compilers is now XLClang. </policy/CMP0089>
+
 Policies Introduced by CMake 3.14
 =================================
 
diff --git a/Help/policy/CMP0089.rst b/Help/policy/CMP0089.rst
new file mode 100644
index 0000000..e549e0c
--- /dev/null
+++ b/Help/policy/CMP0089.rst
@@ -0,0 +1,30 @@
+CMP0089
+-------
+
+Compiler id for IBM Clang-based XL compilers is now ``XLClang``.
+
+CMake 3.15 and above recognize that IBM's Clang-based XL compilers
+that define ``__ibmxl__`` are a new front-end distinct from ``xlc``
+with a different command line and set of capabilities.
+CMake now prefers to present this to projects by setting the
+:variable:`CMAKE_<LANG>_COMPILER_ID` variable to ``XLClang`` instead
+of ``XL``.  However, existing projects may assume the compiler id for
+Clang-based XL is just ``XL`` as it was in CMake versions prior to 3.15.
+Therefore this policy determines for Clang-based XL compilers which
+compiler id to report in the :variable:`CMAKE_<LANG>_COMPILER_ID`
+variable after language ``<LANG>`` is enabled by the :command:`project`
+or :command:`enable_language` command.  The policy must be set prior
+to the invocation of either command.
+
+The OLD behavior for this policy is to use compiler id ``XL``.  The
+NEW behavior for this policy is to use compiler id ``XLClang``.
+
+This policy was introduced in CMake version 3.15.  Use the
+:command:`cmake_policy` command to set this policy to OLD or NEW explicitly.
+Unlike most policies, CMake version |release| does *not* warn
+by default when this policy is not set and simply uses OLD behavior.
+See documentation of the
+:variable:`CMAKE_POLICY_WARNING_CMP0089 <CMAKE_POLICY_WARNING_CMP<NNNN>>`
+variable to control the warning.
+
+.. include:: DEPRECATED.txt
diff --git a/Help/release/dev/add-xlclang.rst b/Help/release/dev/add-xlclang.rst
new file mode 100644
index 0000000..77ff938
--- /dev/null
+++ b/Help/release/dev/add-xlclang.rst
@@ -0,0 +1,5 @@
+add-xlclang
+-----------
+
+* IBM Clang-based XL compilers that define ``__ibmxl__`` now use the
+  compiler id ``XLClang`` instead of ``XL``.  See policy :policy:`CMP0089`.
diff --git a/Help/variable/CMAKE_POLICY_WARNING_CMPNNNN.rst b/Help/variable/CMAKE_POLICY_WARNING_CMPNNNN.rst
index d179728..fc52e7b 100644
--- a/Help/variable/CMAKE_POLICY_WARNING_CMPNNNN.rst
+++ b/Help/variable/CMAKE_POLICY_WARNING_CMPNNNN.rst
@@ -21,6 +21,8 @@ warn by default:
   policy :policy:`CMP0067`.
 * ``CMAKE_POLICY_WARNING_CMP0082`` controls the warning for
   policy :policy:`CMP0082`.
+* ``CMAKE_POLICY_WARNING_CMP0089`` controls the warning for
+  policy :policy:`CMP0089`.
 
 This variable should not be set by a project in CMake code.  Project
 developers running CMake may set this variable in their cache to
diff --git a/Modules/CMakeCompilerIdDetection.cmake b/Modules/CMakeCompilerIdDetection.cmake
index 7039b8d..96a14f7 100644
--- a/Modules/CMakeCompilerIdDetection.cmake
+++ b/Modules/CMakeCompilerIdDetection.cmake
@@ -57,6 +57,7 @@ function(compiler_id_detection outvar lang)
       HP
       Compaq
       zOS
+      XLClang
       XL
       VisualAge
       PGI
diff --git a/Modules/CMakeParseImplicitIncludeInfo.cmake b/Modules/CMakeParseImplicitIncludeInfo.cmake
index 21e24b7..6d7732d 100644
--- a/Modules/CMakeParseImplicitIncludeInfo.cmake
+++ b/Modules/CMakeParseImplicitIncludeInfo.cmake
@@ -92,13 +92,15 @@ function(cmake_parse_implicit_include_line line lang id_var log_var state_var)
   endif()
 
   # XL compiler
-  if("${CMAKE_${lang}_COMPILER_ID}" STREQUAL "XL" AND "${line}" MATCHES "^/"
+  if(("${CMAKE_${lang}_COMPILER_ID}" STREQUAL "XL"
+      OR "${CMAKE_${lang}_COMPILER_ID}" STREQUAL "XLClang")
+     AND "${line}" MATCHES "^/"
      AND ( ("${lang}" STREQUAL "Fortran" AND
             "${line}" MATCHES "/xl[fF]entry " AND
             "${line}" MATCHES "OSVAR\\([^ ]+\\)")
            OR
             (  ("${lang}" STREQUAL "C" OR "${lang}" STREQUAL "CXX") AND
-            "${line}" MATCHES "/xl[cC]entry " AND
+            "${line}" MATCHES "/xl[cC]2?entry " AND
             "${line}" MATCHES " -qosvar=")
          )  )
     # -qnostdinc cancels other stdinc flags, even if present
diff --git a/Modules/Compiler/IBMCPP-C-DetermineVersionInternal.cmake b/Modules/Compiler/IBMCPP-C-DetermineVersionInternal.cmake
index e5b9741..899e284 100644
--- a/Modules/Compiler/IBMCPP-C-DetermineVersionInternal.cmake
+++ b/Modules/Compiler/IBMCPP-C-DetermineVersionInternal.cmake
@@ -1,14 +1,6 @@
 
 set(_compiler_id_version_compute "
-# if defined(__ibmxl__)
-#  define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__ibmxl_version__)
-#  define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__ibmxl_release__)
-#  define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__ibmxl_modification__)
-#  define @PREFIX@COMPILER_VERSION_TWEAK @MACRO_DEC@(__ibmxl_ptf_fix_level__)
-# else
-   /* __IBMC__ = VRP */
-#  define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__IBMC__/100)
-#  define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__IBMC__/10 % 10)
-#  define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__IBMC__    % 10)
-# endif
-")
+  /* __IBMC__ = VRP */
+# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__IBMC__/100)
+# define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__IBMC__/10 % 10)
+# define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__IBMC__    % 10)")
diff --git a/Modules/Compiler/IBMCPP-CXX-DetermineVersionInternal.cmake b/Modules/Compiler/IBMCPP-CXX-DetermineVersionInternal.cmake
index 63c3e32..73aa2b4 100644
--- a/Modules/Compiler/IBMCPP-CXX-DetermineVersionInternal.cmake
+++ b/Modules/Compiler/IBMCPP-CXX-DetermineVersionInternal.cmake
@@ -1,14 +1,6 @@
 
 set(_compiler_id_version_compute "
-# if defined(__ibmxl__)
-#  define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__ibmxl_version__)
-#  define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__ibmxl_release__)
-#  define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__ibmxl_modification__)
-#  define @PREFIX@COMPILER_VERSION_TWEAK @MACRO_DEC@(__ibmxl_ptf_fix_level__)
-# else
-   /* __IBMCPP__ = VRP */
-#  define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__IBMCPP__/100)
-#  define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__IBMCPP__/10 % 10)
-#  define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__IBMCPP__    % 10)
-# endif
-")
+  /* __IBMCPP__ = VRP */
+# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__IBMCPP__/100)
+# define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__IBMCPP__/10 % 10)
+# define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__IBMCPP__    % 10)")
diff --git a/Modules/Compiler/XL-C-DetermineCompiler.cmake b/Modules/Compiler/XL-C-DetermineCompiler.cmake
index 484811e..3f4e05c 100644
--- a/Modules/Compiler/XL-C-DetermineCompiler.cmake
+++ b/Modules/Compiler/XL-C-DetermineCompiler.cmake
@@ -1,4 +1,4 @@
 
-set(_compiler_id_pp_test "defined(__ibmxl__) || (defined(__IBMC__) && !defined(__COMPILER_VER__) && __IBMC__ >= 800)")
+set(_compiler_id_pp_test "defined(__IBMC__) && !defined(__COMPILER_VER__) && __IBMC__ >= 800")
 
 include("${CMAKE_CURRENT_LIST_DIR}/IBMCPP-C-DetermineVersionInternal.cmake")
diff --git a/Modules/Compiler/XL-C.cmake b/Modules/Compiler/XL-C.cmake
index 5dc8bc1..6fc9728 100644
--- a/Modules/Compiler/XL-C.cmake
+++ b/Modules/Compiler/XL-C.cmake
@@ -6,36 +6,15 @@ string(APPEND CMAKE_C_FLAGS_MINSIZEREL_INIT " -DNDEBUG")
 # -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_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_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 ()
+  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()
 
-__compiler_check_default_language_standard(C 10.1 90)
+__compiler_check_default_language_standard(C 10.1 90 11.1 99)
diff --git a/Modules/Compiler/XL-CXX-DetermineCompiler.cmake b/Modules/Compiler/XL-CXX-DetermineCompiler.cmake
index 2bf1ec6..dffa4bc 100644
--- a/Modules/Compiler/XL-CXX-DetermineCompiler.cmake
+++ b/Modules/Compiler/XL-CXX-DetermineCompiler.cmake
@@ -1,4 +1,4 @@
 
-set(_compiler_id_pp_test "defined(__ibmxl__) || (defined(__IBMCPP__) && !defined(__COMPILER_VER__) && __IBMCPP__ >= 800)")
+set(_compiler_id_pp_test "defined(__IBMCPP__) && !defined(__COMPILER_VER__) && __IBMCPP__ >= 800")
 
 include("${CMAKE_CURRENT_LIST_DIR}/IBMCPP-CXX-DetermineVersionInternal.cmake")
diff --git a/Modules/Compiler/XL-CXX.cmake b/Modules/Compiler/XL-CXX.cmake
index b87e923..0026b4a 100644
--- a/Modules/Compiler/XL-CXX.cmake
+++ b/Modules/Compiler/XL-CXX.cmake
@@ -6,41 +6,16 @@ string(APPEND CMAKE_CXX_FLAGS_MINSIZEREL_INIT " -DNDEBUG")
 # -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_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 ()
-      # 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 ()
-  else ()
+  if(CMAKE_SYSTEM MATCHES "Linux")
+    set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "")
+    set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "")
+  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")
-    set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
-  endif ()
+  endif()
+  set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-qlanglvl=extended0x")
+  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
 endif ()
 
 __compiler_check_default_language_standard(CXX 10.1 98)
diff --git a/Modules/Compiler/XL.cmake b/Modules/Compiler/XL.cmake
index 68dc28a..a9cec11 100644
--- a/Modules/Compiler/XL.cmake
+++ b/Modules/Compiler/XL.cmake
@@ -10,12 +10,6 @@ set(__COMPILER_XL 1)
 
 include(Compiler/CMakeCommonCompilerMacros)
 
-# Find the CreateExportList program that comes with this toolchain.
-find_program(CMAKE_XL_CreateExportList
-  NAMES CreateExportList
-  DOC "IBM XL CreateExportList tool"
-  )
-
 macro(__compiler_xl lang)
   # Feature flags.
   set(CMAKE_${lang}_VERBOSE_FLAG "-V")
@@ -35,20 +29,4 @@ macro(__compiler_xl lang)
   set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE     "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
 
   set(CMAKE_DEPFILE_FLAGS_${lang} "-MF <DEPFILE> -qmakedep=gcc")
-
-  # CMAKE_XL_CreateExportList is part of the AIX XL compilers but not the linux ones.
-  # If we found the tool, we'll use it to create exports, otherwise stick with the regular
-  # create shared library compile line.
-  if (CMAKE_XL_CreateExportList)
-    # The compiler front-end passes all object files, archive files, and shared
-    # library files named on the command line to CreateExportList to create a
-    # list of all symbols to be exported from the shared library.  This causes
-    # all archive members to be copied into the shared library whether they are
-    # needed or not.  Instead we run the tool ourselves to pass only the object
-    # files so that we export only the symbols actually provided by the sources.
-    set(CMAKE_${lang}_CREATE_SHARED_LIBRARY
-      "${CMAKE_XL_CreateExportList} <OBJECT_DIR>/objects.exp <OBJECTS>"
-      "<CMAKE_${lang}_COMPILER> <CMAKE_SHARED_LIBRARY_${lang}_FLAGS> -Wl,-bE:<OBJECT_DIR>/objects.exp <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>"
-      )
-  endif()
 endmacro()
diff --git a/Modules/Compiler/XLClang-C-DetermineCompiler.cmake b/Modules/Compiler/XLClang-C-DetermineCompiler.cmake
new file mode 100644
index 0000000..4d89921
--- /dev/null
+++ b/Modules/Compiler/XLClang-C-DetermineCompiler.cmake
@@ -0,0 +1,8 @@
+set(_compiler_id_pp_test "defined(__ibmxl__) && defined(__clang__)")
+
+set(_compiler_id_version_compute "
+# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__ibmxl_version__)
+# define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__ibmxl_release__)
+# define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__ibmxl_modification__)
+# define @PREFIX@COMPILER_VERSION_TWEAK @MACRO_DEC@(__ibmxl_ptf_fix_level__)
+")
diff --git a/Modules/Compiler/XLClang-C.cmake b/Modules/Compiler/XLClang-C.cmake
new file mode 100644
index 0000000..8e8fcf2
--- /dev/null
+++ b/Modules/Compiler/XLClang-C.cmake
@@ -0,0 +1,17 @@
+include(Compiler/XLClang)
+__compiler_xlclang(C)
+
+if (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")
+  set(CMAKE_C11_STANDARD_COMPILE_OPTION  "-qlanglvl=extc1x")
+  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-qlanglvl=extc1x")
+  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")
+  endif ()
+endif()
+
+__compiler_check_default_language_standard(C 13.1.1 99)
diff --git a/Modules/Compiler/XLClang-CXX-DetermineCompiler.cmake b/Modules/Compiler/XLClang-CXX-DetermineCompiler.cmake
new file mode 100644
index 0000000..4d89921
--- /dev/null
+++ b/Modules/Compiler/XLClang-CXX-DetermineCompiler.cmake
@@ -0,0 +1,8 @@
+set(_compiler_id_pp_test "defined(__ibmxl__) && defined(__clang__)")
+
+set(_compiler_id_version_compute "
+# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__ibmxl_version__)
+# define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__ibmxl_release__)
+# define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__ibmxl_modification__)
+# define @PREFIX@COMPILER_VERSION_TWEAK @MACRO_DEC@(__ibmxl_ptf_fix_level__)
+")
diff --git a/Modules/Compiler/XLClang-CXX.cmake b/Modules/Compiler/XLClang-CXX.cmake
new file mode 100644
index 0000000..f535ebc
--- /dev/null
+++ b/Modules/Compiler/XLClang-CXX.cmake
@@ -0,0 +1,20 @@
+include(Compiler/XLClang)
+__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_CXX11_STANDARD_COMPILE_OPTION  "-qlanglvl=extended0x")
+  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-qlanglvl=extended0x")
+  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")
+  endif ()
+endif()
+
+__compiler_check_default_language_standard(CXX 13.1.1 98)
+
+set(CMAKE_CXX_COMPILE_OBJECT
+  "<CMAKE_CXX_COMPILER> -x c++ <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT> -c <SOURCE>")
diff --git a/Modules/Compiler/XLClang.cmake b/Modules/Compiler/XLClang.cmake
new file mode 100644
index 0000000..cdf0fdc
--- /dev/null
+++ b/Modules/Compiler/XLClang.cmake
@@ -0,0 +1,22 @@
+# 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_XLCLANG)
+  return()
+endif()
+set(__COMPILER_XLCLANG 1)
+
+include(Compiler/XL)
+
+macro(__compiler_xlclang lang)
+  __compiler_xl(${lang})
+
+  # Feature flags.
+  set(CMAKE_${lang}_VERBOSE_FLAG "-V")
+  set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC")
+  set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIC")
+  set(CMAKE_${lang}_RESPONSE_FILE_FLAG "@")
+  set(CMAKE_${lang}_RESPONSE_FILE_LINK_FLAG "@")
+endmacro()
diff --git a/Modules/Platform/AIX-XL.cmake b/Modules/Platform/AIX-XL.cmake
index b3078ff..06a806b 100644
--- a/Modules/Platform/AIX-XL.cmake
+++ b/Modules/Platform/AIX-XL.cmake
@@ -25,4 +25,26 @@ macro(__aix_compiler_xl lang)
   set(CMAKE_SHARED_MODULE_${lang}_FLAGS  " ")
 
   set(CMAKE_${lang}_LINK_FLAGS "-Wl,-bnoipath")
+
+  # Find the CreateExportList program that comes with this toolchain.
+  find_program(CMAKE_XL_CreateExportList
+    NAMES CreateExportList
+    DOC "IBM XL CreateExportList tool"
+    )
+
+  # CMAKE_XL_CreateExportList is part of the AIX XL compilers but not the linux ones.
+  # If we found the tool, we'll use it to create exports, otherwise stick with the regular
+  # create shared library compile line.
+  if (CMAKE_XL_CreateExportList)
+    # The compiler front-end passes all object files, archive files, and shared
+    # library files named on the command line to CreateExportList to create a
+    # list of all symbols to be exported from the shared library.  This causes
+    # all archive members to be copied into the shared library whether they are
+    # needed or not.  Instead we run the tool ourselves to pass only the object
+    # files so that we export only the symbols actually provided by the sources.
+    set(CMAKE_${lang}_CREATE_SHARED_LIBRARY
+      "${CMAKE_XL_CreateExportList} <OBJECT_DIR>/objects.exp <OBJECTS>"
+      "<CMAKE_${lang}_COMPILER> <CMAKE_SHARED_LIBRARY_${lang}_FLAGS> -Wl,-bE:<OBJECT_DIR>/objects.exp <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>"
+      )
+  endif()
 endmacro()
diff --git a/Modules/Platform/AIX-XLClang-C.cmake b/Modules/Platform/AIX-XLClang-C.cmake
new file mode 100644
index 0000000..f0bedc5
--- /dev/null
+++ b/Modules/Platform/AIX-XLClang-C.cmake
@@ -0,0 +1,2 @@
+include(Platform/AIX-XLClang)
+__aix_compiler_xlclang(C)
diff --git a/Modules/Platform/AIX-XLClang-CXX.cmake b/Modules/Platform/AIX-XLClang-CXX.cmake
new file mode 100644
index 0000000..cceb576
--- /dev/null
+++ b/Modules/Platform/AIX-XLClang-CXX.cmake
@@ -0,0 +1,2 @@
+include(Platform/AIX-XLClang)
+__aix_compiler_xlclang(CXX)
diff --git a/Modules/Platform/AIX-XLClang.cmake b/Modules/Platform/AIX-XLClang.cmake
new file mode 100644
index 0000000..c932095
--- /dev/null
+++ b/Modules/Platform/AIX-XLClang.cmake
@@ -0,0 +1,15 @@
+# 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(__AIX_COMPILER_XLCLANG)
+  return()
+endif()
+set(__AIX_COMPILER_XLCLANG 1)
+
+include(Platform/AIX-XL)
+
+macro(__aix_compiler_xlclang lang)
+  __aix_compiler_xl(${lang})
+endmacro()
diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index a22cd18..c7b3591 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -956,6 +956,36 @@ void cmGlobalGenerator::CheckCompilerIdCompatibility(
         break;
     }
   }
+
+  if (strcmp(compilerId, "XLClang") == 0) {
+    switch (mf->GetPolicyStatus(cmPolicies::CMP0089)) {
+      case cmPolicies::WARN:
+        if (!this->CMakeInstance->GetIsInTryCompile() &&
+            mf->PolicyOptionalWarningEnabled("CMAKE_POLICY_WARNING_CMP0089")) {
+          std::ostringstream w;
+          /* clang-format off */
+          w << cmPolicies::GetPolicyWarning(cmPolicies::CMP0089) << "\n"
+            "Converting " << lang <<
+            " compiler id \"XLClang\" to \"XL\" for compatibility."
+            ;
+          /* clang-format on */
+          mf->IssueMessage(MessageType::AUTHOR_WARNING, w.str());
+        }
+        CM_FALLTHROUGH;
+      case cmPolicies::OLD:
+        // OLD behavior is to convert XLClang to XL.
+        mf->AddDefinition(compilerIdVar, "XL");
+        break;
+      case cmPolicies::REQUIRED_IF_USED:
+      case cmPolicies::REQUIRED_ALWAYS:
+        mf->IssueMessage(
+          MessageType::FATAL_ERROR,
+          cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0089));
+      case cmPolicies::NEW:
+        // NEW behavior is to keep AppleClang.
+        break;
+    }
+  }
 }
 
 std::string cmGlobalGenerator::GetLanguageOutputExtension(
diff --git a/Source/cmPolicies.h b/Source/cmPolicies.h
index 314f27d..8b21166 100644
--- a/Source/cmPolicies.h
+++ b/Source/cmPolicies.h
@@ -261,7 +261,10 @@ class cmMakefile;
          3, 14, 0, cmPolicies::WARN)                                          \
   SELECT(POLICY, CMP0088,                                                     \
          "FindBISON runs bison in CMAKE_CURRENT_BINARY_DIR when executing.",  \
-         3, 14, 0, cmPolicies::WARN)
+         3, 14, 0, cmPolicies::WARN)                                          \
+  SELECT(POLICY, CMP0089,                                                     \
+         "Compiler id for IBM Clang-based XL compilers is now XLClang.", 3,   \
+         15, 0, cmPolicies::WARN)
 
 #define CM_SELECT_ID(F, A1, A2, A3, A4, A5, A6) F(A1)
 #define CM_FOR_EACH_POLICY_ID(POLICY)                                         \
diff --git a/Tests/RunCMake/ParseImplicitIncludeInfo/ParseImplicitIncludeInfo.cmake b/Tests/RunCMake/ParseImplicitIncludeInfo/ParseImplicitIncludeInfo.cmake
index ce8d45b..869fe3d 100644
--- a/Tests/RunCMake/ParseImplicitIncludeInfo/ParseImplicitIncludeInfo.cmake
+++ b/Tests/RunCMake/ParseImplicitIncludeInfo/ParseImplicitIncludeInfo.cmake
@@ -10,6 +10,7 @@ project(Minimal NONE)
 #
 set(targets
   aix-C-XL-13.1.3 aix-CXX-XL-13.1.3
+  aix-C-XLClang-16.1.0.1 aix-CXX-XLClang-16.1.0.1
   craype-C-Cray-8.7 craype-CXX-Cray-8.7 craype-Fortran-Cray-8.7
   craype-C-GNU-7.3.0 craype-CXX-GNU-7.3.0 craype-Fortran-GNU-7.3.0
   craype-C-Intel-18.0.2.20180210 craype-CXX-Intel-18.0.2.20180210
diff --git a/Tests/RunCMake/ParseImplicitIncludeInfo/data/CMakeLists.txt b/Tests/RunCMake/ParseImplicitIncludeInfo/data/CMakeLists.txt
index b854e2e..bffe819 100644
--- a/Tests/RunCMake/ParseImplicitIncludeInfo/data/CMakeLists.txt
+++ b/Tests/RunCMake/ParseImplicitIncludeInfo/data/CMakeLists.txt
@@ -12,6 +12,9 @@
 #
 
 cmake_minimum_required(VERSION 3.3)
+if(POLICY CMP0089)
+  cmake_policy(SET CMP0089 NEW)
+endif()
 
 set(lngs C CXX)
 set(LANGUAGES "${lngs}" CACHE STRING "List of languages to generate inputs for")
diff --git a/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-C-XLClang-16.1.0.1.input b/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-C-XLClang-16.1.0.1.input
new file mode 100644
index 0000000..2f018e6
--- /dev/null
+++ b/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-C-XLClang-16.1.0.1.input
@@ -0,0 +1,40 @@
+CMAKE_LANG=C
+CMAKE_C_COMPILER_ABI=
+CMAKE_C_COMPILER_AR=
+CMAKE_C_COMPILER_ARCHITECTURE_ID=
+CMAKE_C_COMPILER_EXTERNAL_TOOLCHAIN=
+CMAKE_C_COMPILER_ID=XLClang
+CMAKE_C_COMPILER_LAUNCHER=
+CMAKE_C_COMPILER_LOADED=1
+CMAKE_C_COMPILER_RANLIB=
+CMAKE_C_COMPILER_TARGET=
+CMAKE_C_COMPILER_VERSION=16.1.0.1
+CMAKE_C_COMPILER_VERSION_INTERAL=
+Change Dir: /tmp/ii/CMakeFiles/CMakeTmp
+
+Run Build Command(s):/usr/bin/gmake cmTC_fcf21/fast
+/usr/bin/gmake -f CMakeFiles/cmTC_fcf21.dir/build.make CMakeFiles/cmTC_fcf21.dir/build
+gmake[1]: Entering directory '/tmp/ii/CMakeFiles/CMakeTmp'
+Building C object CMakeFiles/cmTC_fcf21.dir/CMakeCCompilerABI.c.o
+/opt/IBM/xlC/16.1.0/bin/xlclang   -V -o CMakeFiles/cmTC_fcf21.dir/CMakeCCompilerABI.c.o   -c /tmp/CMake/Modules/CMakeCCompilerABI.c
+export XL_CONFIG=/opt/IBM/xlc/16.1.0/etc/xlc.cfg.72:xlclang
+export XL_ASMOBJFILES=/tmp/xlcASuz87id
+export "XL_DIS=/opt/IBM/xlc/16.1.0/exe/dis -o "CMakeFiles/cmTC_fcf21.dir/CMakeCCompilerABI.c.o" "CMakeCCompilerABI.o""
+/opt/IBM/xlC/16.1.0/exe/xlC2entry -qosvar=aix.7.2 -qalias=ansi -qthreaded -D_THREAD_SAFE -Wno-parentheses -Wno-unused-value -D_AIX -D_AIX32 -D_AIX41 -D_AIX43 -D_AIX50 -D_AIX51 -D_AIX52 -D_AIX53 -D_AIX61 -D_AIX71 -D_AIX72 -D_IBMR2 -D_POWER -xc -qasm_as=/bin/as -qc_stdinc=/opt/IBM/xlC/16.1.0/include2:/opt/IBM/xlC/16.1.0/include2/aix:/opt/IBM/xlmass/9.1.0/include:/usr/include -qvac_include_path=/opt/IBM/xlc/16.1.0/include -oCMakeFiles/cmTC_fcf21.dir/CMakeCCompilerABI.c.o /tmp/CMake/Modules/CMakeCCompilerABI.c /tmp/xlcW0tZ87ia /tmp/xlcW1ub87ib /dev/null /tmp/xlcLu487ieF.lst /dev/null /tmp/xlcW2uj87ic
+export XL_BACKEND=/opt/IBM/xlc/16.1.0/exe/xlCcode
+export XL_LINKER=/bin/ld
+/opt/IBM/xlc/16.1.0/exe/xlCcode -qalias=ansi -qthreaded /tmp/xlcW0tZ87ia /tmp/xlcW1ub87ib CMakeFiles/cmTC_fcf21.dir/CMakeCCompilerABI.c.o /tmp/xlcLu487ieB.lst /tmp/xlcW2uj87ic
+rm /tmp/xlcASuz87id
+rm /tmp/xlcLu487ie
+rm /tmp/xlcW0tZ87ia
+rm /tmp/xlcW1ub87ib
+rm /tmp/xlcW2uj87ic
+Linking C executable cmTC_fcf21
+/tmp/CMake/bin/cmake -E cmake_link_script CMakeFiles/cmTC_fcf21.dir/link.txt --verbose=1
+/opt/IBM/xlC/16.1.0/bin/xlclang   -Wl,-bnoipath -Wl,-brtl -V -Wl,-bexpall CMakeFiles/cmTC_fcf21.dir/CMakeCCompilerABI.c.o  -o cmTC_fcf21 -Wl,-blibpath:/usr/lib:/lib
+export XL_CONFIG=/opt/IBM/xlc/16.1.0/etc/xlc.cfg.72:xlclang
+/bin/ld -b32 /lib/crt0.o -bpT:0x10000000 -bpD:0x20000000 -bnoipath -brtl -bexpall CMakeFiles/cmTC_fcf21.dir/CMakeCCompilerABI.c.o -o cmTC_fcf21 -blibpath:/usr/lib:/lib -L/opt/IBM/xlmass/9.1.0/lib/aix61 -L/opt/IBM/xlc/16.1.0/lib -lxlopt -lxlipa -lxl -lc -lpthreads
+rm /tmp/xlcW0vJG7ia
+rm /tmp/xlcW1vNG7ib
+rm /tmp/xlcW2vRG7ic
+gmake[1]: Leaving directory '/tmp/ii/CMakeFiles/CMakeTmp'
diff --git a/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-C-XLClang-16.1.0.1.output b/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-C-XLClang-16.1.0.1.output
new file mode 100644
index 0000000..85399b7
--- /dev/null
+++ b/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-C-XLClang-16.1.0.1.output
@@ -0,0 +1 @@
+/opt/IBM/xlC/16.1.0/include2;/opt/IBM/xlC/16.1.0/include2/aix;/opt/IBM/xlmass/9.1.0/include;/usr/include
diff --git a/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-CXX-XLClang-16.1.0.1.input b/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-CXX-XLClang-16.1.0.1.input
new file mode 100644
index 0000000..da16db3
--- /dev/null
+++ b/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-CXX-XLClang-16.1.0.1.input
@@ -0,0 +1,44 @@
+CMAKE_LANG=CXX
+CMAKE_CXX_COMPILER_ABI=
+CMAKE_CXX_COMPILER_AR=
+CMAKE_CXX_COMPILER_ARCHITECTURE_ID=
+CMAKE_CXX_COMPILER_EXTERNAL_TOOLCHAIN=
+CMAKE_CXX_COMPILER_ID=XLClang
+CMAKE_CXX_COMPILER_LAUNCHER=
+CMAKE_CXX_COMPILER_LOADED=1
+CMAKE_CXX_COMPILER_RANLIB=
+CMAKE_CXX_COMPILER_TARGET=
+CMAKE_CXX_COMPILER_VERSION=16.1.0.1
+CMAKE_CXX_COMPILER_VERSION_INTERAL=
+Change Dir: /tmp/ii/CMakeFiles/CMakeTmp
+
+Run Build Command(s):/usr/bin/gmake cmTC_b8490/fast
+/usr/bin/gmake -f CMakeFiles/cmTC_b8490.dir/build.make CMakeFiles/cmTC_b8490.dir/build
+gmake[1]: Entering directory '/tmp/ii/CMakeFiles/CMakeTmp'
+Building CXX object CMakeFiles/cmTC_b8490.dir/CMakeCXXCompilerABI.cpp.o
+/opt/IBM/xlC/16.1.0/bin/xlclang++ -x c++   -V -o CMakeFiles/cmTC_b8490.dir/CMakeCXXCompilerABI.cpp.o -c /tmp/CMake/Modules/CMakeCXXCompilerABI.cpp
+export XL_CONFIG=/opt/IBM/xlc/16.1.0/etc/xlc.cfg.72:xlclang++
+export XL_XLCMP_PATH=/opt/IBM/xlc/16.1.0:/opt/IBM/xlC/16.1.0
+export XL_COMPILER=xlc++
+export XL_ASMOBJFILES=/tmp/xlcAS3IXqid
+export "XL_DIS=/opt/IBM/xlc/16.1.0/exe/dis -o "CMakeFiles/cmTC_b8490.dir/CMakeCXXCompilerABI.cpp.o" "CMakeCXXCompilerABI.o""
+/opt/IBM/xlC/16.1.0/exe/xlC2entry -qosvar=aix.7.2 -qalias=ansi -qthreaded -D_THREAD_SAFE -Wno-parentheses -Wno-unused-value -D_AIX -D_AIX32 -D_AIX41 -D_AIX43 -D_AIX50 -D_AIX51 -D_AIX52 -D_AIX53 -D_AIX61 -D_AIX71 -D_AIX72 -D_IBMR2 -D_POWER -xc++ -qasm_as=/bin/as -qcpp_stdinc=/opt/IBM/xlC/16.1.0/include2/c++:/opt/IBM/xlC/16.1.0/include2:/opt/IBM/xlC/16.1.0/include2/aix:/opt/IBM/xlmass/9.1.0/include:/usr/include -qc_stdinc=/opt/IBM/xlC/16.1.0/include2:/opt/IBM/xlC/16.1.0/include2/aix:/opt/IBM/xlmass/9.1.0/include:/usr/include -oCMakeFiles/cmTC_b8490.dir/CMakeCXXCompilerABI.cpp.o /tmp/CMake/Modules/CMakeCXXCompilerABI.cpp /tmp/xlcW03uXqia /tmp/xlcW137Xqib /dev/null /tmp/xlcL3QXqieF.lst /dev/null /tmp/xlcW23AXqic
+export XL_BACKEND=/opt/IBM/xlc/16.1.0/exe/xlCcode
+export XL_LINKER=/bin/ld
+/opt/IBM/xlc/16.1.0/exe/xlCcode -qalias=ansi -qthreaded /tmp/xlcW03uXqia /tmp/xlcW137Xqib CMakeFiles/cmTC_b8490.dir/CMakeCXXCompilerABI.cpp.o /tmp/xlcL3QXqieB.lst /tmp/xlcW23AXqic
+rm /tmp/xlcAS3IXqid
+rm /tmp/xlcL3QXqie
+rm /tmp/xlcW03uXqia
+rm /tmp/xlcW137Xqib
+rm /tmp/xlcW23AXqic
+Linking CXX executable cmTC_b8490
+/tmp/CMake/bin/cmake -E cmake_link_script CMakeFiles/cmTC_b8490.dir/link.txt --verbose=1
+/opt/IBM/xlC/16.1.0/bin/xlclang++    -Wl,-bnoipath -Wl,-brtl -V -Wl,-bexpall CMakeFiles/cmTC_b8490.dir/CMakeCXXCompilerABI.cpp.o  -o cmTC_b8490 -Wl,-blibpath:/usr/lib:/lib
+export XL_CONFIG=/opt/IBM/xlc/16.1.0/etc/xlc.cfg.72:xlclang++
+/bin/ld -b32 /lib/crt0.o /lib/crti.o -bpT:0x10000000 -bpD:0x20000000 -bnoipath -brtl -bexpall CMakeFiles/cmTC_b8490.dir/CMakeCXXCompilerABI.cpp.o -o cmTC_b8490 -blibpath:/usr/lib:/lib -bcdtors:all:0:s -btmplrename -L/opt/IBM/xlmass/9.1.0/lib/aix61 -L/opt/IBM/xlc/16.1.0/lib -lxlopt -lxlipa -lxl -L/opt/IBM/xlC/16.1.0/lib -lc++ -lCcore -lpthreads -lm -lc  |
+/opt/IBM/xlC/16.1.0/bin/c++filt -S |
+/bin/sed '/317.*::virtual-fn-table-ptr$/ s/^\(.*: \)*{*\([^}]*\)\(}*.*\)::virtual-fn-table-ptr$/\1Virtual table for class "\2": Some possible causes are: first non-inline virtual function in "\2" is not defined or the class is a template instantiation and an explicit instantiation definition of the class is missing./'
+rm /tmp/xlcW05fS7ia
+rm /tmp/xlcW15rS7ib
+rm /tmp/xlcW25vS7ic
+gmake[1]: Leaving directory '/tmp/ii/CMakeFiles/CMakeTmp'
diff --git a/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-CXX-XLClang-16.1.0.1.output b/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-CXX-XLClang-16.1.0.1.output
new file mode 100644
index 0000000..e462894
--- /dev/null
+++ b/Tests/RunCMake/ParseImplicitIncludeInfo/data/aix-CXX-XLClang-16.1.0.1.output
@@ -0,0 +1 @@
+/opt/IBM/xlC/16.1.0/include2/c++;/opt/IBM/xlC/16.1.0/include2;/opt/IBM/xlC/16.1.0/include2/aix;/opt/IBM/xlmass/9.1.0/include;/usr/include
diff --git a/Utilities/cmcurl/CMakeLists.txt b/Utilities/cmcurl/CMakeLists.txt
index 74929d9..8dc3b2c 100644
--- a/Utilities/cmcurl/CMakeLists.txt
+++ b/Utilities/cmcurl/CMakeLists.txt
@@ -77,7 +77,7 @@ endif(APPLE)
 
 # Disable warnings to avoid changing 3rd party code.
 if(CMAKE_C_COMPILER_ID MATCHES
-    "^(GNU|Clang|AppleClang|XL|VisualAge|SunPro|HP|Intel)$")
+    "^(GNU|Clang|AppleClang|XLClang|XL|VisualAge|SunPro|HP|Intel)$")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
 elseif(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
diff --git a/Utilities/cmexpat/CMakeLists.txt b/Utilities/cmexpat/CMakeLists.txt
index 7165689..13eb56d 100644
--- a/Utilities/cmexpat/CMakeLists.txt
+++ b/Utilities/cmexpat/CMakeLists.txt
@@ -1,6 +1,6 @@
 # Disable warnings to avoid changing 3rd party code.
 IF(CMAKE_C_COMPILER_ID MATCHES
-    "^(GNU|Clang|AppleClang|XL|VisualAge|SunPro|HP|Intel)$")
+    "^(GNU|Clang|AppleClang|XLClang|XL|VisualAge|SunPro|HP|Intel)$")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
 ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
diff --git a/Utilities/cmjsoncpp/CMakeLists.txt b/Utilities/cmjsoncpp/CMakeLists.txt
index a66f9673..764be8d 100644
--- a/Utilities/cmjsoncpp/CMakeLists.txt
+++ b/Utilities/cmjsoncpp/CMakeLists.txt
@@ -2,7 +2,7 @@ project(JsonCpp CXX)
 
 # Disable warnings to avoid changing 3rd party code.
 if(CMAKE_CXX_COMPILER_ID MATCHES
-    "^(GNU|Clang|AppleClang|XL|VisualAge|SunPro|HP|Intel)$")
+    "^(GNU|Clang|AppleClang|XLClang|XL|VisualAge|SunPro|HP|Intel)$")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -w")
 elseif(CMAKE_CXX_COMPILER_ID STREQUAL "PathScale")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -woffall")
diff --git a/Utilities/cmjsoncpp/include/json/config.h b/Utilities/cmjsoncpp/include/json/config.h
index eb52e71..34f7314 100644
--- a/Utilities/cmjsoncpp/include/json/config.h
+++ b/Utilities/cmjsoncpp/include/json/config.h
@@ -5,13 +5,14 @@
 
 #ifndef JSON_CONFIG_H_INCLUDED
 #define JSON_CONFIG_H_INCLUDED
-#include <stddef.h>
-#include <string> //typedef String
-#include <stdint.h> //typedef int64_t, uint64_t
 
 // Include KWSys Large File Support configuration.
 #include <cmsys/Configure.h>
 
+#include <stddef.h>
+#include <string> //typedef String
+#include <stdint.h> //typedef int64_t, uint64_t
+
 #if defined(_MSC_VER)
 # pragma warning(push,1)
 #endif
diff --git a/Utilities/cmlibarchive/CMakeLists.txt b/Utilities/cmlibarchive/CMakeLists.txt
index 6426ebe..53b3a83 100644
--- a/Utilities/cmlibarchive/CMakeLists.txt
+++ b/Utilities/cmlibarchive/CMakeLists.txt
@@ -60,7 +60,7 @@ SET(CMAKE_REQUIRED_FLAGS)
 
 # Disable warnings to avoid changing 3rd party code.
 IF(CMAKE_C_COMPILER_ID MATCHES
-    "^(GNU|Clang|AppleClang|XL|VisualAge|SunPro|HP|Intel)$")
+    "^(GNU|Clang|AppleClang|XLClang|XL|VisualAge|SunPro|HP|Intel)$")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
 ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
diff --git a/Utilities/cmliblzma/CMakeLists.txt b/Utilities/cmliblzma/CMakeLists.txt
index 252f0f9..b443fd6 100644
--- a/Utilities/cmliblzma/CMakeLists.txt
+++ b/Utilities/cmliblzma/CMakeLists.txt
@@ -183,7 +183,7 @@ INCLUDE_DIRECTORIES(
 
 # Disable warnings to avoid changing 3rd party code.
 IF(CMAKE_C_COMPILER_ID MATCHES
-    "^(GNU|Clang|AppleClang|XL|VisualAge|SunPro|HP|Intel)$")
+    "^(GNU|Clang|AppleClang|XLClang|XL|VisualAge|SunPro|HP|Intel)$")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
 ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
diff --git a/Utilities/cmlibrhash/CMakeLists.txt b/Utilities/cmlibrhash/CMakeLists.txt
index 1cdd660..6067b7d 100644
--- a/Utilities/cmlibrhash/CMakeLists.txt
+++ b/Utilities/cmlibrhash/CMakeLists.txt
@@ -2,7 +2,7 @@ project(librhash C)
 
 # Disable warnings to avoid changing 3rd party code.
 if(CMAKE_C_COMPILER_ID MATCHES
-    "^(GNU|Clang|AppleClang|XL|VisualAge|SunPro|HP|Intel)$")
+    "^(GNU|Clang|AppleClang|XLClang|XL|VisualAge|SunPro|HP|Intel)$")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
 elseif(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
diff --git a/Utilities/cmlibuv/CMakeLists.txt b/Utilities/cmlibuv/CMakeLists.txt
index 2e95bef..2e781f1 100644
--- a/Utilities/cmlibuv/CMakeLists.txt
+++ b/Utilities/cmlibuv/CMakeLists.txt
@@ -2,7 +2,7 @@ project(libuv C)
 
 # Disable warnings to avoid changing 3rd party code.
 if(CMAKE_C_COMPILER_ID MATCHES
-    "^(GNU|Clang|AppleClang|XL|VisualAge|SunPro|HP|Intel)$")
+    "^(GNU|Clang|AppleClang|XLClang|XL|VisualAge|SunPro|HP|Intel)$")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
 elseif(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
diff --git a/Utilities/cmlibuv/src/unix/atomic-ops.h b/Utilities/cmlibuv/src/unix/atomic-ops.h
index 7cac1f9..be741dc 100644
--- a/Utilities/cmlibuv/src/unix/atomic-ops.h
+++ b/Utilities/cmlibuv/src/unix/atomic-ops.h
@@ -37,7 +37,7 @@ UV_UNUSED(static int cmpxchgi(int* ptr, int oldval, int newval)) {
                         : "r" (newval), "0" (oldval)
                         : "memory");
   return out;
-#elif defined(_AIX) && defined(__xlC__)
+#elif defined(_AIX) && (defined(__xlC__) || defined(__ibmxl__))
   const int out = (*(volatile int*) ptr);
   __compare_and_swap(ptr, &oldval, newval);
   return out;
@@ -63,7 +63,7 @@ UV_UNUSED(static long cmpxchgl(long* ptr, long oldval, long newval)) {
                         : "r" (newval), "0" (oldval)
                         : "memory");
   return out;
-#elif defined(_AIX) && defined(__xlC__)
+#elif defined(_AIX) && (defined(__xlC__) || defined(__ibmxl__))
   const long out = (*(volatile int*) ptr);
 # if defined(__64BIT__)
   __compare_and_swaplp(ptr, &oldval, newval);
diff --git a/Utilities/cmzlib/CMakeLists.txt b/Utilities/cmzlib/CMakeLists.txt
index 1c9ca42..888c3ff 100644
--- a/Utilities/cmzlib/CMakeLists.txt
+++ b/Utilities/cmzlib/CMakeLists.txt
@@ -2,7 +2,7 @@ PROJECT(CMZLIB)
 
 # Disable warnings to avoid changing 3rd party code.
 if(CMAKE_C_COMPILER_ID MATCHES
-    "^(GNU|Clang|AppleClang|XL|VisualAge|SunPro|HP|Intel)$")
+    "^(GNU|Clang|AppleClang|XLClang|XL|VisualAge|SunPro|HP|Intel)$")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -w")
 elseif(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")