Add support for LoongArch

checks/architecture/Jamfile.jam

@@ -18,6 +18,7 @@ obj 64 : 64.cpp ;
 
 obj arm      : arm.cpp ;
 obj combined : combined.cpp ;
+obj loongarch : loongarch.cpp ;
 obj mips     : mips.cpp ;
 alias mips1  : mips ; # Backwards compatibility
 obj power    : power.cpp ;

checks/architecture/loongarch.cpp

@@ -0,0 +1,11 @@
+// loongarch.cpp
+//
+// Copyright (c) 2022 Zhang Na
+//
+// 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)
+
+#if !defined(__loongarch__)
+#error "Not LoongArch"
+#endif