# Copyright 2020 The IREE Authors
#
# Licensed under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

cmake_minimum_required(VERSION 3.13)

# CMake invokes the toolchain file twice during the first build, but only once
# during subsequent rebuilds. This was causing the various flags to be added
# twice on the first build, and on a rebuild ninja would see only one set of the
# flags and rebuild the world.
# https://github.com/android-ndk/ndk/issues/323
if(RISCV_TOOLCHAIN_INCLUDED)
  return()
endif(RISCV_TOOLCHAIN_INCLUDED)
set(RISCV_TOOLCHAIN_INCLUDED true)

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(RISCV_COMPILER_FLAGS)
set(RISCV_COMPILER_FLAGS_CXX)
set(RISCV_COMPILER_FLAGS_DEBUG)
set(RISCV_COMPILER_FLAGS_RELEASE)
set(RISCV_LINKER_FLAGS)
set(RISCV_LINKER_FLAGS_EXE)

if(RISCV_CPU STREQUAL "rv64")
  set(CMAKE_SYSTEM_NAME Linux)
  set(CMAKE_SYSTEM_LIBRARY_PATH "${RISCV_TOOLCHAIN_ROOT}/sysroot/usr/lib")
  set(RISCV_COMPILER_FLAGS "${RISCV_COMPILER_FLAGS} -march=rv64gc -mabi=lp64d")
  set(RISCV_LINKER_FLAGS "${RISCV_LINKER_FLAGS} -lstdc++ -lpthread -lm -ldl")
elseif(RISCV_CPU STREQUAL "rv32-baremetal")
  set(CMAKE_SYSTEM_NAME Generic)
  set(CMAKE_CROSSCOMPILING ON CACHE BOOL "")
  set(CMAKE_C_STANDARD 11)
  set(CMAKE_C_EXTENSIONS OFF)     # Force the usage of _ISOC11_SOURCE
  set(IREE_BUILD_BINDINGS_TFLITE OFF CACHE BOOL "" FORCE)
  set(IREE_BUILD_BINDINGS_TFLITE_JAVA OFF CACHE BOOL "" FORCE)
  set(IREE_HAL_DRIVER_DEFAULTS OFF CACHE BOOL "" FORCE)
  set(IREE_HAL_DRIVER_LOCAL_SYNC ON CACHE BOOL "" FORCE)
  set(IREE_HAL_EXECUTABLE_LOADER_DEFAULTS OFF CACHE BOOL "" FORCE)
  set(IREE_HAL_EXECUTABLE_LOADER_EMBEDDED_ELF ON CACHE BOOL "" FORCE)
  set(IREE_HAL_EXECUTABLE_LOADER_VMVX_MODULE ON CACHE BOOL "" FORCE)
  set(CMAKE_SYSTEM_LIBRARY_PATH "${RISCV_TOOLCHAIN_ROOT}/riscv32-unknown-elf/lib")
  set(IREE_ENABLE_THREADING OFF CACHE BOOL "" FORCE)
  set(RISCV_COMPILER_FLAGS "${RISCV_COMPILER_FLAGS} -march=rv32imf -mabi=ilp32 -DIREE_PLATFORM_GENERIC=1 -DIREE_SYNCHRONIZATION_DISABLE_UNSAFE=1 \
      -DIREE_FILE_IO_ENABLE=0 -DIREE_TIME_NOW_FN=\"\{ return 0; \}\" -DIREE_DEVICE_SIZE_T=uint32_t -DPRIdsz=PRIu32")
  set(RISCV_LINKER_FLAGS "${RISCV_LINKER_FLAGS} -lm")
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}")