ENH: Added CPU.h to KWSys to identify the target CPU and its byte order.

Source/kwsys/CMakeLists.txt

@@ -138,6 +138,7 @@ IF(KWSYS_STANDALONE OR CMake_SOURCE_DIR)
   SET(KWSYS_USE_DateStamp 1)
   SET(KWSYS_USE_String 1)
   SET(KWSYS_USE_SystemInformation 1)
+  SET(KWSYS_USE_CPU 1)
 ENDIF(KWSYS_STANDALONE OR CMake_SOURCE_DIR)
   
 # Setup the large file support default.
@@ -651,7 +652,9 @@ FOREACH(cpp ${cppclasses})
 ENDFOREACH(cpp)
 
 # Add selected C components.
-FOREACH(c Process Base64 FundamentalType MD5 Terminal System DateStamp String)
+FOREACH(c
+    Process Base64 FundamentalType MD5 Terminal System DateStamp String CPU
+    )
   IF(KWSYS_USE_${c})
     # Use the corresponding header file.
     SET(KWSYS_H_FILES ${KWSYS_H_FILES} ${c})

Source/kwsys/CPU.h.in

@@ -0,0 +1,111 @@
+/*=========================================================================
+
+  Program:   KWSys - Kitware System Library
+  Module:    $RCSfile$
+
+  Copyright (c) Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#ifndef @KWSYS_NAMESPACE@_CPU_h
+#define @KWSYS_NAMESPACE@_CPU_h
+
+#include <@KWSYS_NAMESPACE@/Configure.h>
+
+/* Identify possible endian cases.  The macro
+   @KWSYS_NAMESPACE@_CPU_ENDIAN_ID will be defined to one of these, or
+   0 if unknown.  */
+#define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG    4321
+#define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE 1234
+
+/* Apple always defines one of these.  */
+#if defined(__LITTLE_ENDIAN__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+#elif defined(__BIG_ENDIAN__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* Alpha */
+#elif defined(__alpha) || defined(__alpha__) || defined(_M_ALPHA)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE__
+
+/* Intel x86 */
+#elif defined(__i386) || defined(__i386__) || defined(_M_IX86)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+#elif defined(_X86_) || defined(__THW_INTEL__) || defined(__I86__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+#elif defined(__MWERKS__) && defined(__INTEL__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+
+/* Intel x86-64 */
+#elif defined(__x86_64) || defined(__x86_64__) || defined(_M_X64)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+#elif defined(__amd64) || defined(__amd64__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+
+/* Intel Architecture-64 (Itanium) */
+#elif defined(__ia64) || defined(__ia64__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+#elif defined(_IA64) || defined(__IA64__) || defined(_M_IA64)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+
+/* PowerPC */
+#elif defined(__powerpc) || defined(__powerpc__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+#elif defined(__ppc) || defined(__ppc__) || defined(__POWERPC__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* SPARC */
+#elif defined(__sparc) || defined(__sparc__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* HP/PA RISC */
+#elif defined(__hppa) || defined(__hppa__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* Motorola 68k */
+#elif defined(__m68k__) || defined(M68000)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* MIPS */
+#elif defined(__mips) || defined(__mips__) || defined(__MIPS__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* RS/6000 */
+#elif defined(__THW_RS600) || defined(_IBMR2) || defined(_POWER)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+#elif defined(_ARCH_PWR) || defined(_ARCH_PWR2)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* System/370 */
+#elif defined(__370__) || defined(__THW_370__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* System/390 */
+#elif defined(__s390__) || defined(__s390x__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* z/Architecture */
+#elif defined(__SYSC_ZARCH__)
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+
+/* Unknown CPU */
+#else
+# define @KWSYS_NAMESPACE@_CPU_ENDIAN_ID 0
+# if !defined(@KWSYS_NAMESPACE@_CPU_UNKNOWN_OKAY)
+#  error "The target CPU architecture is not known."
+# endif
+#endif
+
+/* If building a C or C++ file in kwsys itself, give the source file
+   access to the macros without a configured namespace.  */
+#if defined(KWSYS_NAMESPACE)
+# define KWSYS_CPU_ENDIAN_ID        @KWSYS_NAMESPACE@_CPU_ENDIAN_ID
+# define KWSYS_CPU_ENDIAN_ID_BIG    @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_BIG
+# define KWSYS_CPU_ENDIAN_ID_LITTLE @KWSYS_NAMESPACE@_CPU_ENDIAN_ID_LITTLE
+#endif
+
+#endif