From a86690e20981cb79b8eb6a13705ac43ebb8a4f7f Mon Sep 17 00:00:00 2001
From: Takashi Kato <ktakashi@ymail.com>
Date: Mon, 27 Nov 2023 13:55:19 +0100
Subject: [PATCH] Using CMake TestBigEndian module to check endianness

---
 CMakeLists.txt                            |  6 +++-
 cmake/config-cmake.h.in                   |  2 ++
 src/sagittarius/private/sagittariusdefs.h | 44 +----------------------
 3 files changed, 8 insertions(+), 44 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c1fa1266d..4cae13dbf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.12)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.5)
 PROJECT(Sagittarius)
 
 ### options
@@ -33,6 +33,7 @@ INCLUDE(${CMAKE_ROOT}/Modules/CheckCSourceRuns.cmake)
 INCLUDE(${CMAKE_ROOT}/Modules/CheckCSourceCompiles.cmake)
 INCLUDE(${CMAKE_ROOT}/Modules/CheckLibraryExists.cmake)
 INCLUDE(${CMAKE_ROOT}/Modules/CheckCCompilerFlag.cmake)
+INCLUDE(${CMAKE_ROOT}/Modules/TestBigEndian.cmake)
 INCLUDE(${PROJECT_SOURCE_DIR}/cmake/CheckAlloca.cmake)
 INCLUDE(${PROJECT_SOURCE_DIR}/cmake/CheckVariable.cmake)
 INCLUDE(${PROJECT_SOURCE_DIR}/cmake/Triple.cmake)
@@ -165,6 +166,9 @@ HAVE_CPU_COUNT)
 STRING(TOLOWER ${CMAKE_SYSTEM_NAME} SAGITTARIUS_PLATFORM)
 STRING(TOLOWER ${CMAKE_SYSTEM_PROCESSOR} SAGITTARIUS_PROCESSOR)
 
+TEST_BIG_ENDIAN(PLATFORM_BIGENDIAN)
+MESSAGE(STATUS "Is big endian ... ${PLATFORM_BIGENDIAN}")
+
 TRIPLE(SAGITTARIUS_PROCESSOR SAGITTARIUS_PLATFORM
   SAGITTARIUS_OS SAGITTARIUS_VENDOR SAGITTARIUS_TRIPLE)
 
diff --git a/cmake/config-cmake.h.in b/cmake/config-cmake.h.in
index e63de2303..3af421de9 100644
--- a/cmake/config-cmake.h.in
+++ b/cmake/config-cmake.h.in
@@ -87,6 +87,8 @@
 #cmakedefine SAGITTARIUS_PLATFORM "@SAGITTARIUS_PLATFORM@"
 #cmakedefine SAGITTARIUS_PROCESSOR "@SAGITTARIUS_PROCESSOR@"
 
+#cmakedefine PLATFORM_BIGENDIAN
+
 #ifdef _MSC_VER
 #define PRIdPTR     "Id"
 #endif
diff --git a/src/sagittarius/private/sagittariusdefs.h b/src/sagittarius/private/sagittariusdefs.h
index 2d52858d9..eebf6bb76 100644
--- a/src/sagittarius/private/sagittariusdefs.h
+++ b/src/sagittarius/private/sagittariusdefs.h
@@ -158,49 +158,7 @@ char *alloca ();
 # endif
 #endif
 
-
-/* detect endianness(from boost/detail/endian.hpp) */
-#if defined (__GLIBC__)
-# include <endian.h>
-# if (__BYTE_ORDER == __LITTLE_ENDIAN)
-#  define BOOST_LITTLE_ENDIAN
-# elif (__BYTE_ORDER == __BIG_ENDIAN)
-#  define BOOST_BIG_ENDIAN
-# elif (__BYTE_ORDER == __PDP_ENDIAN)
-#  define BOOST_PDP_ENDIAN
-# else
-#  error Unknown machine endianness detected.
-# endif
-# define BOOST_BYTE_ORDER __BYTE_ORDER
-#elif defined(_BIG_ENDIAN) && !defined(_LITTLE_ENDIAN)
-# define BOOST_BIG_ENDIAN
-# define BOOST_BYTE_ORDER 4321
-#elif defined(_LITTLE_ENDIAN) && !defined(_BIG_ENDIAN)
-# define BOOST_LITTLE_ENDIAN
-# define BOOST_BYTE_ORDER 1234
-#elif defined(__sparc) || defined(__sparc__) \
-   || defined(_POWER) || defined(__powerpc__) \
-   || defined(__ppc__) || defined(__hpux) || defined(__hppa) \
-   || defined(_MIPSEB) || defined(_POWER) \
-   || defined(__s390__)
-# define BOOST_BIG_ENDIAN
-# define BOOST_BYTE_ORDER 4321
-#elif defined(__i386__) || defined(__alpha__) \
-   || defined(__ia64) || defined(__ia64__) \
-   || defined(_M_IX86) || defined(_M_IA64) \
-   || defined(_M_ALPHA) || defined(__amd64) \
-   || defined(__amd64__) || defined(_M_AMD64) \
-   || defined(__x86_64) || defined(__x86_64__) \
-   || defined(_M_X64) || defined(__bfin__)      \
-   || defined(__arm__) || defined(__arm64__)
-
-# define BOOST_LITTLE_ENDIAN
-# define BOOST_BYTE_ORDER 1234
-#else
-# error Failed to detect endian
-#endif
-
-#if defined BOOST_BIG_ENDIAN
+#if defined PLATFORM_BIGENDIAN
 # ifdef MAC
 #  if defined __BIG_ENDIAN__
 #   define WORDS_BIGENDIAN 1