cmake: Add riscv32 toolchain file

Author: chfast

cmake/toolchains/riscv32.cmake

@@ -0,0 +1,19 @@
+# evmone: Ethereum Virtual Machine
+# Copyright 2023 Pawel Bylica.
+# Licensed under the Apache License, Version 2.0. See the LICENSE file.
+
+set(RISCV /usr/local/riscv)
+
+set(CMAKE_SYSTEM_PROCESSOR riscv32)
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_C_COMPILER ${RISCV}/bin/clang)
+set(CMAKE_CXX_COMPILER ${RISCV}/bin/clang++)
+
+set(CMAKE_CXX_FLAGS_INIT -stdlib=libc++)
+
+set(CMAKE_FIND_ROOT_PATH ${RISCV}/sysroot)
+SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+set(CMAKE_CROSSCOMPILING_EMULATOR qemu-riscv32-static;-L;${CMAKE_FIND_ROOT_PATH})