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set(CMAKE_CROSSCOMPILING TRUE)
set(CMAKE_SYSTEM_NAME "Linux")
set(CMAKE_SYSTEM_PROCESSOR "riscv64")
option(USE_RVV "Enable riscv vector or not." ON)
option(USE_AUTO_VECTORIZER "Enable riscv auto vectorizer or not." OFF)
# Avoid to use system path for cross-compile
set(CMAKE_FIND_USE_CMAKE_SYSTEM_PATH FALSE)
set(TOOLCHAIN_PATH "" CACHE STRING "The toolcahin path.")
if(NOT TOOLCHAIN_PATH)
set(TOOLCHAIN_PATH ${CMAKE_SOURCE_DIR}/build-toolchain-qemu/riscv-clang)
endif()
set(TOOLCHAIN_PREFIX "riscv64-unknown-linux-gnu-" CACHE STRING "The toolcahin prefix.")
# toolchain setting
set(CMAKE_C_COMPILER "${TOOLCHAIN_PATH}/bin/${TOOLCHAIN_PREFIX}clang")
set(CMAKE_CXX_COMPILER "${TOOLCHAIN_PATH}/bin/${TOOLCHAIN_PREFIX}clang++")
# CMake will just use the host-side tools for the following tools, so we setup them here.
set(CMAKE_C_COMPILER_AR "${TOOLCHAIN_PATH}/bin/llvm-ar")
set(CMAKE_CXX_COMPILER_AR "${TOOLCHAIN_PATH}/bin/llvm-ar")
set(CMAKE_C_COMPILER_RANLIB "${TOOLCHAIN_PATH}/bin/llvm-ranlib")
set(CMAKE_CXX_COMPILER_RANLIB "${TOOLCHAIN_PATH}/bin/llvm-ranlib")
set(CMAKE_OBJDUMP "${TOOLCHAIN_PATH}/bin/llvm-objdump")
set(CMAKE_OBJCOPY "${TOOLCHAIN_PATH}/bin/llvm-objcopy")
# compile options
message(STATUS "USE_RVV: ${USE_RVV}")
message(STATUS "USE_AUTO_VECTORIZER: ${USE_AUTO_VECTORIZER}")
set(RISCV_COMPILER_FLAGS)
if(USE_RVV)
list(APPEND RISCV_COMPILER_FLAGS "-march=rv64gcv")
if(NOT USE_AUTO_VECTORIZER)
# Disable auto-vectorizer
add_compile_options(-fno-vectorize -fno-slp-vectorize)
endif()
else()
list(APPEND RISCV_COMPILER_FLAGS "-march=rv64gc")
endif()
message(STATUS "RISCV_COMPILER_FLAGS: ${RISCV_COMPILER_FLAGS}")
set(CMAKE_C_FLAGS "${RISCV_COMPILER_FLAGS} ${CMAKE_C_FLAGS}")
set(CMAKE_CXX_FLAGS "${RISCV_COMPILER_FLAGS} ${CMAKE_CXX_FLAGS}")
set(RISCV_LINKER_FLAGS "-lstdc++ -lpthread -lm -ldl")
set(RISCV_LINKER_FLAGS_EXE)
set(CMAKE_SHARED_LINKER_FLAGS "${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}")
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