Merge branch 'upstream-KWSys' into update-kwsys

# By KWSys Upstream
* upstream-KWSys:
  KWSys 2022-06-03 (c28e27bc)

Source/kwsys/CMakeLists.txt

@@ -88,17 +88,7 @@
 # any outside mailing list and no documentation of the change will be
 # written.
 
-cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
-foreach(p
-    CMP0056 # CMake 3.2, Honor link flags in try_compile() source-file signature.
-    CMP0063 # CMake 3.3, Honor visibility properties for all target types.
-    CMP0067 # CMake 3.8, Honor language standard in try_compile source-file signature.
-    CMP0069 # CMake 3.9, INTERPROCEDURAL_OPTIMIZATION is enforced when enabled.
-    )
-  if(POLICY ${p})
-    cmake_policy(SET ${p} NEW)
-  endif()
-endforeach()
+cmake_minimum_required(VERSION 3.9...3.22 FATAL_ERROR)
 
 # Some configure checks depend upon the deployment target. Clear checks when
 # the deployment target changes.
@@ -1111,7 +1101,7 @@ if(KWSYS_STANDALONE OR CMake_SOURCE_DIR)
     # Some Apple compilers produce bad optimizations in this source.
     if(APPLE AND CMAKE_C_COMPILER_ID MATCHES "^(GNU|LLVM)$")
       set(testProcess_COMPILE_FLAGS "${testProcess_COMPILE_FLAGS} -O0")
-    elseif(CMAKE_C_COMPILER_ID STREQUAL "XL")
+    elseif(CMAKE_C_COMPILER_ID MATCHES "^(XL|XLClang)$")
       # Tell IBM XL not to warn about our test infinite loop
       if(CMAKE_SYSTEM MATCHES "Linux.*ppc64le"
          AND CMAKE_C_COMPILER_VERSION VERSION_LESS "16.1.0"

Source/kwsys/ProcessUNIX.c

@@ -1,5 +1,9 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing#kwsys for details.  */
+#if !defined(_WIN32) && !defined(__APPLE__) && !defined(__OpenBSD__)
+/* NOLINTNEXTLINE(bugprone-reserved-identifier) */
+#  define _XOPEN_SOURCE 600
+#endif
 #include "kwsysPrivate.h"
 #include KWSYS_HEADER(Process.h)
 #include KWSYS_HEADER(System.h)

Source/kwsys/Terminal.c

@@ -1,5 +1,9 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing#kwsys for details.  */
+#if !defined(_WIN32) && !defined(__APPLE__) && !defined(__OpenBSD__)
+/* NOLINTNEXTLINE(bugprone-reserved-identifier) */
+#  define _XOPEN_SOURCE 600
+#endif
 #include "kwsysPrivate.h"
 #include KWSYS_HEADER(Terminal.h)
 

Source/kwsys/testProcess.c

@@ -1,5 +1,9 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing#kwsys for details.  */
+#if !defined(_WIN32) && !defined(__APPLE__) && !defined(__OpenBSD__)
+/* NOLINTNEXTLINE(bugprone-reserved-identifier) */
+#  define _XOPEN_SOURCE 600
+#endif
 #include "kwsysPrivate.h"
 #include KWSYS_HEADER(Process.h)
 #include KWSYS_HEADER(Encoding.h)

Source/kwsys/testSharedForward.c.in

@@ -1,5 +1,9 @@
 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
    file Copyright.txt or https://cmake.org/licensing#kwsys for details.  */
+#if !defined(_WIN32) && !defined(__APPLE__) && !defined(__OpenBSD__)
+/* NOLINTNEXTLINE(bugprone-reserved-identifier) */
+#  define _XOPEN_SOURCE 600
+#endif
 #if defined(CMAKE_INTDIR)
 #  define CONFIG_DIR_PRE CMAKE_INTDIR "/"
 #  define CONFIG_DIR_POST "/" CMAKE_INTDIR