ncnn

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set(CMAKE_SYSTEM_NAME Generic)
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set(CMAKE_SYSTEM_PROCESSOR riscv64)
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if(DEFINED ENV{RISCV_ROOT_PATH})
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    file(TO_CMAKE_PATH $ENV{RISCV_ROOT_PATH} RISCV_ROOT_PATH)
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else()
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    message(FATAL_ERROR "RISCV_ROOT_PATH env must be defined")
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endif()
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set(RISCV_ROOT_PATH ${RISCV_ROOT_PATH} CACHE STRING "root path to riscv gnu toolchain")
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set(CMAKE_C_COMPILER "clang")
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set(CMAKE_CXX_COMPILER "clang++")
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set(CMAKE_SYSROOT "${RISCV_ROOT_PATH}/sysroot")
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set(CMAKE_C_COMPILER_TARGET "riscv64-unknown-linux-gnu")
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set(CMAKE_CXX_COMPILER_TARGET "riscv64-unknown-linux-gnu")
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if(NOT CMAKE_FIND_ROOT_PATH_MODE_PROGRAM)
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    set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
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endif()
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if(NOT CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
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    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
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endif()
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if(NOT CMAKE_FIND_ROOT_PATH_MODE_INCLUDE)
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    set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
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endif()
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if(NOT CMAKE_FIND_ROOT_PATH_MODE_PACKAGE)
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    set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
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endif()
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# add --ld-path=${RISCV_ROOT_PATH}/bin/riscv64-unknown-linux-gnu-ld or append $RISCV_ROOT_PATH/bin to PATH.
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set(CMAKE_C_FLAGS "--gcc-toolchain=${RISCV_ROOT_PATH} -march=rv64gc")
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set(CMAKE_CXX_FLAGS "--gcc-toolchain=${RISCV_ROOT_PATH} -march=rv64gc")
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# cache flags
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" CACHE STRING "c++ flags")
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