# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

cmake_minimum_required (VERSION 3.13)

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR riscv)

if(CMAKE_HOST_SYSTEM_NAME STREQUAL Linux)
  set(RISCV_HOST_TAG linux)
elseif(CMAKE_HOST_SYSTEM_NAME STREQUAL Darwin)
  set(RISCV_HOST_TAG darwin)
endif()

set(RISCV_TOOLCHAIN_NAME clang)

set(RISCV_TOOL_PATH "$ENV{HOME}/riscv" CACHE PATH "RISC-V tool path")

set(RISCV_TOOLCHAIN_ROOT "${RISCV_TOOL_PATH}/toolchain/clang/${RISCV_HOST_TAG}/RISCV" CACHE PATH "RISC-V compiler path")
set(CMAKE_FIND_ROOT_PATH ${RISCV_TOOLCHAIN_ROOT})
list(APPEND CMAKE_PREFIX_PATH "${RISCV_TOOLCHAIN_ROOT}")

set(CMAKE_C_COMPILER "${RISCV_TOOLCHAIN_ROOT}/bin/clang")
set(CMAKE_CXX_COMPILER "${RISCV_TOOLCHAIN_ROOT}/bin/clang++")
set(CMAKE_AR "${RISCV_TOOLCHAIN_ROOT}/bin/llvm-ar")
set(CMAKE_RANLIB "${RISCV_TOOLCHAIN_ROOT}/bin/llvm-ranlib")
set(CMAKE_STRIP "${RISCV_TOOLCHAIN_ROOT}/bin/llvm-strip")
set(CMAKE_SYSTEM_LIBRARY_PATH "${RISCV_TOOLCHAIN_ROOT}/sysroot/usr/lib")

set(RISCV_COMPILER_FLAGS)
set(RISCV_COMPILER_FLAGS_CXX)
set(RISCV_COMPILER_FLAGS_DEBUG)
set(RISCV_COMPILER_FLAGS_RELEASE)
set(RISCV_LINKER_FLAGS "-lstdc++ -lpthread -lm -ldl")
set(RISCV_LINKER_FLAGS_EXE)

if(RISCV_CPU STREQUAL "rv64")
  list(APPEND RISCV_COMPILER_FLAGS "-march=rv64gc -mabi=lp64d")
endif()

set(CMAKE_C_FLAGS             "${RISCV_COMPILER_FLAGS} ${CMAKE_C_FLAGS}")
set(CMAKE_CXX_FLAGS           "${RISCV_COMPILER_FLAGS} ${RISCV_COMPILER_FLAGS_CXX} ${CMAKE_CXX_FLAGS}")
set(CMAKE_ASM_FLAGS           "${RISCV_COMPILER_FLAGS} ${CMAKE_ASM_FLAGS}")
set(CMAKE_C_FLAGS_DEBUG       "${RISCV_COMPILER_FLAGS_DEBUG} ${CMAKE_C_FLAGS_DEBUG}")
set(CMAKE_CXX_FLAGS_DEBUG     "${RISCV_COMPILER_FLAGS_DEBUG} ${CMAKE_CXX_FLAGS_DEBUG}")
set(CMAKE_ASM_FLAGS_DEBUG     "${RISCV_COMPILER_FLAGS_DEBUG} ${CMAKE_ASM_FLAGS_DEBUG}")
set(CMAKE_C_FLAGS_RELEASE     "${RISCV_COMPILER_FLAGS_RELEASE} ${CMAKE_C_FLAGS_RELEASE}")
set(CMAKE_CXX_FLAGS_RELEASE   "${RISCV_COMPILER_FLAGS_RELEASE} ${CMAKE_CXX_FLAGS_RELEASE}")
set(CMAKE_ASM_FLAGS_RELEASE   "${RISCV_COMPILER_FLAGS_RELEASE} ${CMAKE_ASM_FLAGS_RELEASE}")
set(CMAKE_SHARED_LINKER_FLAGS "${RISCV_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}")
set(CMAKE_MODULE_LINKER_FLAGS "${RISCV_LINKER_FLAGS} ${CMAKE_MODULE_LINKER_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS    "${RISCV_LINKER_FLAGS} ${RISCV_LINKER_FLAGS_EXE} ${CMAKE_EXE_LINKER_FLAGS}")