背景

1. 参考官方的算子开发快速入门教程：HelloWorld，完整源码在gitee
2. 我的环境：香橙派 AI Pro 20T, CANN版本：8.0RC1alpha3
3. 运行日志：

   (base) root@orangepiaipro-20t:~/Programs/CANN_study/samples/operator/HelloWorldSample# ./run.sh -v Ascend310B1
   -- The C compiler identification is GNU 11.4.0
   -- The CXX compiler identification is GNU 11.4.0
   -- Detecting C compiler ABI info
   -- Detecting C compiler ABI info - done
   -- Check for working C compiler: /usr/bin/cc - skipped
   -- Detecting C compile features
   -- Detecting C compile features - done
   -- Detecting CXX compiler ABI info
   -- Detecting CXX compiler ABI info - done
   -- Check for working CXX compiler: /usr/bin/c++ - skipped
   -- Detecting CXX compile features
   -- Detecting CXX compile features - done
   -- Configuring done
   -- Generating done
   -- Build files have been written to: /root/Programs/CANN_study/samples/operator/HelloWorldSample/build
   [  3%] Creating directories for 'kernels_preprocess'
   [  7%] No download step for 'kernels_preprocess'
   [ 10%] No update step for 'kernels_preprocess'
   [ 14%] No patch step for 'kernels_preprocess'
   [ 17%] Performing configure step for 'kernels_preprocess'
   -- The C compiler identification is GNU 11.4.0
   -- The CXX compiler identification is GNU 11.4.0
   -- Detecting C compiler ABI info
   -- Detecting C compiler ABI info - done
   -- Check for working C compiler: /usr/bin/cc - skipped
   -- Detecting C compile features
   -- Detecting C compile features - done
   -- Detecting CXX compiler ABI info
   -- Detecting CXX compiler ABI info - done
   -- Check for working CXX compiler: /usr/bin/c++ - skipped
   -- Detecting CXX compile features
   -- Detecting CXX compile features - done
   -- Configuring done
   -- Generating done
   -- Build files have been written to: /root/Programs/CANN_study/samples/operator/HelloWorldSample/build/kernels_preprocess-prefix/src/kernels_preprocess-build
   [ 21%] Performing build step for 'kernels_preprocess'
   [100%] Building CXX object CMakeFiles/preprocess_obj.dir/root/Programs/CANN_study/samples/operator/HelloWorldSample/hello_world.cpp.o
   bisheng: error: unknown argument: '-fcce-no-kernel-type-section'

4. 报错信息：

   bisheng: error: unknown argument: '-fcce-no-kernel-type-section'

解决办法

1. 看报错信息，应该是bisheng没有'-fcce-no-kernel-type-section'这个参数。我们可以通过下面的命令查看bisheng编译器的所有可用参数，并且参数信息保存到bisheng_help.log中。

   bisheng --help > bisheng_help.log

2. 打开这个bisheng_help.log文件，搜索fcce关键字，确实没有看到'-fcce-no-kernel-type-section'，但是有看到下面两个类似的参数，从参数定义来看，-fcce-kernel-type-section更为接近，估计是换成这个参数了。

   -fcce-kernel-launch-custom
                             Transform the kernel launch expression to a user-defined host function. Please be aware that this option changes the compilation behavior of cce host-side.
     -fcce-kernel-type-section
                             Generate meta sections for kernel types.

3. 解决思路，我们需要将-fcce-no-kernel-type-section换成bisheng编译器支持的-fcce-kernel-type-section，可以通过grep命令去CANN安装路径去搜索这个参数。

   cd /usr/local/Ascend/ascend-toolkit
   grep "fcce-no-kernel-type-section" -r ./*
   
   # 搜索结果如下：
   ./8.0/aarch64-linux/tikcpp/ascendc_kernel_cmake/bisheng_intf.cmake:    "SHELL:-fcce-no-kernel-type-section"
   ./8.0/python/site-packages/ascendctools/auto_debug/npu/npu_compiler.py:            compile_cmds.extend(['-fcce-no-kernel-type-section'])
   
   ./8.0.RC1/aarch64-linux/tikcpp/ascendc_kernel_cmake/bisheng_intf.cmake:    "SHELL:-fcce-no-kernel-type-section"
   ./8.0.RC1/python/site-packages/ascendctools/auto_debug/npu/npu_compiler.py:            compile_cmds.extend(['-fcce-no-kernel-type-section'])

4. 可以看到搜到4个文件，其实8.0就是8.0RC的软链接，不信我们可以用下面的命令测试一下：

   cd /usr/local/Ascend/ascend-t
   total 12K
   lrwxrwxrwx  1 root root    9 Jul 10 13:47 8.0 -> ./8.0.RC1
   drwxr-xr-x 17 root root 4.0K Jul 10 14:02 8.0.RC1
   drwxr-xr-x  5 root root 4.0K Jul 10 14:02 latest

5. 所以理论上来说，只修改2个文件就行，这里我修改8.0RC对应的两个文件，将-fcce-no-kernel-type-section换成-fcce-kernel-type-section即可。

6. 修改完后，删除build目录，重新编译一次，可以编译通过。但是print没有输出，看了一下代码，CANN 8.0RC1beta3版，里面的print确实是啥也没干。

   // printf关联了AscendC::PRINTF
   #define print PRINTF
   
   template <class... Args>
   __aicore__ inline void PRINTF(__gm__ const char* fmt, Args&&... args)
   {
   // 不走上面的分支，走else分支，所以啥也没干
   #ifdef ASCENDC_DUMP
       printfImpl(fmt, args...);
   #else
       return;
   #endif
   }

7. 但是文档写的确实有print出来东西，怀疑是CANN8.0RC2alpha3支持printf函数输出东西，于是我又升级了一下CANN8.0RC2alpha3版本，但是还是没有数据，也没有报错，看了一下printf接口的实现，确实也是空的，所以暂时不管了。