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Ne10 的交叉編譯筆記

Note of Cross Compilation on Ne10

Posted by imprld01 on Friday, July 8, 2022

目錄

原始碼來源

https://github.com/projectNe10/Ne10

目標平台

  • Arm
  • armv7

修改GNUlinux_config.cmake

  1. 可以在開頭補上兩個變數，避免編譯測試：

    set(CMAKE_C_COMPILER_FORCED TRUE)
set(CMAKE_CXX_COMPILER_FORCED TRUE)

set(GNULINUX_PLATFORM ON)
set(CMAKE_SYSTEM_NAME "Linux")
set(CMAKE_SYSTEM_PROCESSOR "arm")

  2. 設定"armv7"的編譯器路徑：

    if(NE10_LINUX_TARGET_ARCH STREQUAL "armv7")
   set(MYSYSROOT "/path/toolchain/x86_64-ca9v1-tc14-toolchain-9.0/sysroots/ca9v1-starfishmllib32-linux-gnueabi")
   set(CMAKE_C_COMPILER "/path/toolchain/x86_64-ca9v1-tc14-toolchain-9.0/sysroots/x86_64-starfishsdk-linux/usr/bin/arm-starfish-linux-gnueabi/arm-starfish-linux-gnueabi-gcc")
   set(CMAKE_CXX_COMPILER "/path/toolchain/x86_64-ca9v1-tc14-toolchain-9.0/sysroots/x86_64-starfishsdk-linux/usr/bin/arm-starfish-linux-gnueabi/arm-starfish-linux-gnueabi-g++")
   set(CMAKE_ASM_COMPILER "/path/toolchain/x86_64-ca9v1-tc14-toolchain-9.0/sysroots/x86_64-starfishsdk-linux/usr/bin/arm-starfish-linux-gnueabi/arm-starfish-linux-gnueabi-as")
   find_program(CMAKE_AR NAMES "arm-starfish-linux-gnueabi-ar" PATHS "/home2/bowuns/source/k8/kernel/system/tmp/toolchain/x86_64-ca9v1-tc14-toolchain-9.0/sysroots/x86_64-starfishsdk-linux/usr/bin/arm-starfish-linux-gnueabi/" NO_DEFAULT_PATH)
   find_program(CMAKE_RANLIB NAMES "arm-starfish-linux-gnueabi-ranlib" PATHS "/home2/bowuns/source/k8/kernel/system/tmp/toolchain/x86_64-ca9v1-tc14-toolchain-9.0/sysroots/x86_64-starfishsdk-linux/usr/bin/arm-starfish-linux-gnueabi/" NO_DEFAULT_PATH)

    • 對於linux x86_64本機的編譯器路徑則可如下表示：

      if(NE10_LINUX_TARGET_ARCH STREQUAL "armv7")
   set(MYSYSROOT "/usr/arm-linux-gnueabihf/")
   set(CMAKE_C_COMPILER "/usr/bin/arm-linux-gnueabihf-gcc")
   set(CMAKE_CXX_COMPILER "/usr/bin/arm-linux-gnueabihf-g++")
   set(CMAKE_ASM_COMPILER "/usr/bin/arm-linux-gnueabihf-as")
   find_program(CMAKE_AR NAMES "arm-linux-gnueabihf-ar" PATHS "/usr/bin/" NO_DEFAULT_PATH)
   find_program(CMAKE_RANLIB NAMES "arm-linux-gnueabihf-ranlib" PATHS "/usr/bin/" NO_DEFAULT_PATH)

修改CMakelists.txt

  1. 將參數改為ON，建置Share Object：

    option(NE10_BUILD_SHARED "Build NE10 shared libraries" ON)

  2. 選擇預期的模式 (Optional)，這裡使用預設值：

    option(NE10_ARM_HARD_FLOAT "Build NE10 for hard float abi" ON)

  3. 修改GNULINUX_PLATFORM的編譯參數：

    if("${NE10_TARGET_ARCH}" STREQUAL "armv7")
  set(FLOAT_ABI "softfp")
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --sysroot=${MYSYSROOT} -mthumb -march=armv7-a -mfloat-abi=${FLOAT_ABI} -mfpu=vfp3 -funsafe-math-optimizations")
  set(CMAKE_ASM_FLAGS "${CMAKE_C_FLAGS} -mthumb -march=armv7-a -mfpu=neon")
  # Turn on asm optimization for Linux on ARM v7.
  set(NE10_ASM_OPTIMIZATION on)
endif()
    • 這裡強制將armv7的FLOAT_ABI設為"softfp"，也可以透過前一個步驟的方式來設定

執行編譯

cd $NE10_PATH
mkdir build && cd build
export NE10_LINUX_TARGET_ARCH=armv7
cmake -DCMAKE_TOOLCHAIN_FILE=../GNUlinux_config.cmake ..
make
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