Add support for Elbrus 2000 (e2k) architecture (#116)

include/boost/predef/architecture.h

@@ -14,6 +14,7 @@ http://www.boost.org/LICENSE_1_0.txt)
 #include <boost/predef/architecture/arm.h>
 #include <boost/predef/architecture/blackfin.h>
 #include <boost/predef/architecture/convex.h>
+#include <boost/predef/architecture/e2k.h>
 #include <boost/predef/architecture/ia64.h>
 #include <boost/predef/architecture/m68k.h>
 #include <boost/predef/architecture/mips.h>

include/boost/predef/architecture/e2k.h

@@ -0,0 +1,54 @@
+/*
+Copyright Konstantin Ivlev 2021
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE_1_0.txt or copy at
+http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#ifndef BOOST_PREDEF_ARCHITECTURE_E2K_H
+#define BOOST_PREDEF_ARCHITECTURE_E2K_H
+
+#include <boost/predef/version_number.h>
+#include <boost/predef/make.h>
+
+/* tag::reference[]
+= `BOOST_ARCH_E2K`
+
+https://en.wikipedia.org/wiki/Elbrus_2000[E2K] architecture.
+
+[options="header"]
+|===
+| {predef_symbol} | {predef_version}
+
+| `+__e2k__+` | {predef_detection}
+
+| `+__e2k__+` | V.0.0
+|===
+*/ // end::reference[]
+
+#define BOOST_ARCH_E2K BOOST_VERSION_NUMBER_NOT_AVAILABLE
+
+#if defined(__e2k__)
+#   undef BOOST_ARCH_E2K
+#   if !defined(BOOST_ARCH_E2K) && defined(__iset__)
+#       define BOOST_ARCH_E2K BOOST_VERSION_NUMBER(__iset__,0,0)
+#   endif
+#   if !defined(BOOST_ARCH_E2K)
+#       define BOOST_ARCH_E2K BOOST_VERSION_NUMBER_AVAILABLE
+#   endif
+#endif
+
+#if BOOST_ARCH_E2K
+#   define BOOST_ARCH_E2K_AVAILABLE
+#endif
+
+#if BOOST_ARCH_E2K
+#   define BOOST_ARCH_WORD_BITS_64 BOOST_VERSION_NUMBER_AVAILABLE
+#endif
+
+#define BOOST_ARCH_E2K_NAME "E2K"
+
+#endif
+
+#include <boost/predef/detail/test.h>
+BOOST_PREDEF_DECLARE_TEST(BOOST_ARCH_E2K,BOOST_ARCH_E2K_NAME)

include/boost/predef/architecture/sparc.h

@@ -24,7 +24,9 @@ http://en.wikipedia.org/wiki/SPARC[SPARC] architecture.
 | `+__sparc+` | {predef_detection}
 
 | `+__sparcv9+` | 9.0.0
+| `+__sparc_v9__+` | 9.0.0
 | `+__sparcv8+` | 8.0.0
+| `+__sparc_v8__+` | 8.0.0
 |===
 */ // end::reference[]
 
@@ -32,10 +34,10 @@ http://en.wikipedia.org/wiki/SPARC[SPARC] architecture.
 
 #if defined(__sparc__) || defined(__sparc)
 #   undef BOOST_ARCH_SPARC
-#   if !defined(BOOST_ARCH_SPARC) && defined(__sparcv9)
+#   if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv9) || defined(__sparc_v9__)
 #       define BOOST_ARCH_SPARC BOOST_VERSION_NUMBER(9,0,0)
 #   endif
-#   if !defined(BOOST_ARCH_SPARC) && defined(__sparcv8)
+#   if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv8) || defined(__sparc_v8__)
 #       define BOOST_ARCH_SPARC BOOST_VERSION_NUMBER(8,0,0)
 #   endif
 #   if !defined(BOOST_ARCH_SPARC)

include/boost/predef/other/endian.h

@@ -124,7 +124,8 @@ information and acquired knowledge:
         defined(_MIPSEL) || \
         defined(__MIPSEL) || \
         defined(__MIPSEL__) || \
-        defined(__riscv)
+        defined(__riscv) || \
+        defined(__e2k__)
 #       undef BOOST_ENDIAN_LITTLE_BYTE
 #       define BOOST_ENDIAN_LITTLE_BYTE BOOST_VERSION_NUMBER_AVAILABLE
 #   endif