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我是参考以下站点1进行的，但是当我使用以下过程构建它时，发生了错误。如果有人知道原因，请告诉我。

1vi .vscode/settings.json

2 我还会附上一张图片。2

{
    "cmake.configureEnvironment": {
        "PICO_SDK_PATH": "/home/$ubuntu/micro_ros_ws/src/pico-sdk",
    },
}

3code .

错误代码

[{
    "resource": "/home/ubuntu/micro_ros_ws/src/micro_ros_raspberrypi_pico_sdk/CMakeLists.txt",
    "owner": "cmake-configure-diags",
    "severity": 8,
    "message": "CMake Error at CMakeLists.txt:3 (include):include could not find load file:\n\n  /home/$ubuntu/micro_ros_ws/src/pico-sdk/external/pico_sdk_import.cmake",
    "source": "CMake (include)",
    "startLineNumber": 3,
    "startColumn": 1,
    "endLineNumber": 3,
    "endColumn": 10000
}]

[{
    "resource": "/usr/share/cmake-3.16/Modules/CMakeTestCCompiler.cmake",
    "owner": "cmake-configure-diags",
    "severity": 8,
    "message": "CMake Error at /usr/share/cmake-3.16/Modules/CMakeTestCCompiler.cmake:60 (message):The C compiler\n\n  \"/bin/arm-none-eabi-gcc-9.2.1\"\n\nis not able to compile a simple test program.\n\nIt fails with the following output:\n\n  Change Dir: /home/ubuntu/micro_ros_ws/src/micro_ros_raspberrypi_pico_sdk/build/CMakeFiles/CMakeTmp\n  \n  Run Build Command(s):/usr/bin/make cmTC_157be/fast && /usr/bin/make -f CMakeFiles/cmTC_157be.dir/build.make CMakeFiles/cmTC_157be.dir/build\n  make[1]: Entering directory '/home/ubuntu/micro_ros_ws/src/micro_ros_raspberrypi_pico_sdk/build/CMakeFiles/CMakeTmp'\n  Building C object CMakeFiles/cmTC_157be.dir/testCCompiler.c.o\n  /bin/arm-none-eabi-gcc-9.2.1    -o CMakeFiles/cmTC_157be.dir/testCCompiler.c.o   -c /home/ubuntu/micro_ros_ws/src/micro_ros_raspberrypi_pico_sdk/build/CMakeFiles/CMakeTmp/testCCompiler.c\n  Linking C executable cmTC_157be\n  /usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_157be.dir/link.txt --verbose=1\n  /bin/arm-none-eabi-gcc-9.2.1      CMakeFiles/cmTC_157be.dir/testCCompiler.c.o  -o cmTC_157be \n  /usr/lib/gcc/arm-none-eabi/9.2.1/../../../arm-none-eabi/bin/ld: /usr/lib/gcc/arm-none-eabi/9.2.1/../../../arm-none-eabi/lib/libc.a(lib_a-exit.o): in function `exit':\n  /build/newlib-CVVEyx/newlib-3.3.0/build/arm-none-eabi/newlib/libc/stdlib/../../../../../newlib/libc/stdlib/exit.c:64: undefined reference to `_exit'\n  collect2: error: ld returned 1 exit status\n  make[1]: *** [CMakeFiles/cmTC_157be.dir/build.make:87: cmTC_157be] Error 1\n  make[1]: Leaving directory '/home/ubuntu/micro_ros_ws/src/micro_ros_raspberrypi_pico_sdk/build/CMakeFiles/CMakeTmp'\n  make: *** [Makefile:121: cmTC_157be/fast] Error 2\n  \n  \n\n\n\nCMake will not be able to correctly generate this project.",
    "source": "CMake (message)",
    "startLineNumber": 60,
    "startColumn": 1,
    "endLineNumber": 60,
    "endColumn": 10000,
    "relatedInformation": [
        {
            "startLineNumber": 5,
            "startColumn": 1,
            "endLineNumber": 5,
            "endColumn": 1000,
            "message": "In call to 'project' here",
            "resource": "/home/ubuntu/micro_ros_ws/src/micro_ros_raspberrypi_pico_sdk/CMakeLists.txt"
        }
    ]
}]
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