compile error when build megcc

[alanguo1234]

hi
I get the latest source code, I build megcc source code as the user guide, the step as follows:

1. apt-get install cmake ninja-build
   2./third_party/prepare.sh
2. cd megcc/compiler
3. mkdir build
4. cmake .. -G Ninja
5. ninja

the error log as below:
../tools/mgb-to-tinynn/mgb-to-tinynn.cpp:102:19: error: ‘kernel_exporter’ has not been declared
export_cv_opr(kernel_exporter, dump_info->cv_impl);
^~~~~~~~~~~~~~~
../tools/mgb-to-tinynn/mgb-to-tinynn.cpp:102:36: error: ‘dump_info’ has not been declared
export_cv_opr(kernel_exporter, dump_info->cv_impl);
^~~~~~~~~
../tools/mgb-to-tinynn/mgb-to-tinynn.cpp:102:45: error: expected ‘,’ or ‘...’ before ‘->’ token
export_cv_opr(kernel_exporter, dump_info->cv_impl);
^~
../tools/mgb-to-tinynn/mgb-to-tinynn.cpp:102:54: error: ISO C++ forbids declaration of ‘export_cv_opr’ with no type [-fpermissive]
export_cv_opr(kernel_exporter, dump_info->cv_impl);

[yeasoon]

which platform it was compiled?

[alanguo1234]

the build error have been fixed. thanks.

by the way, OpBuilder::InsertionGuard _(m_builder); I don't find any description about var define with _ at cppreference

[yeasoon]

this is in mlir project and not the description of c++