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Posted to dev@tvm.apache.org by wZuck via Apache TVM Discuss <no...@discuss.tvm.ai> on 2022/02/28 09:41:50 UTC
[Apache TVM Discuss] [Development] [BYOC] how to link extern .so files
Hi, I followed the BYOC tutorial and inserted some op functions of my compute library. When my op can run without any extern .so files, I found it works well. But if a op function relays on an extern .so library, TVM reports this error:
```
python: symbol lookup error: /home/.../dense.so: undefined symbol: extern_func_symbol
```
I have tried to add compile flags in `lib.export_library("./dense.so", options = "-std=c++11 -Lxxxxx")
`, but TVM reports `g++: error: unrecognized command line option ‘-std=c++11 -Lxxxxx’`
How can I fix it?
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[Apache TVM Discuss] [Development] [BYOC] how to link extern .so files
Posted by masahi via Apache TVM Discuss <no...@discuss.tvm.ai>.
You can take a look at how we integrate DNNL (aka oneDNN). I think you need to link your `*.so` file to `libtvm.so` or `libtvm_runtime.so`. cc @comaniac
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[Apache TVM Discuss] [Development] [BYOC] how to link extern .so files
Posted by Zihao Ye via Apache TVM Discuss <no...@discuss.tvm.ai>.
try add the following line to `CMakeLists.txt`:
```
target_link_libraries(tvm PRIVATE ${PATH_TO_YOUR_SHARED_LIBRARY})
target_link_libraries(tvm_runtime PRIVATE ${PATH_TO_YOUR_SHARED_LIBRARY})
```
and rebuild TVM.
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[Apache TVM Discuss] [Development] [BYOC] how to link extern .so files
Posted by "Cody H. Yu via Apache TVM Discuss" <no...@discuss.tvm.ai>.
The way you use is for static link for the generated code why the error is for dynamic link. As @masahi pointed out, you should link your .so to TVM, which means you may need to add this library to the TVM building process.
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