ChuanqiXu9 wrote:

> > I tried to take a look at eigen and it looks like the declaration looks 
> > well and I had no clue how that happens. A reproducer may be necessary here 
> > to proceed. Thanks in advance.
> 
> I can reproduce using the following sources and invocations outlined in 
> `run.sh` 
> [usx95@363d877](https://github.com/usx95/llvm-project/commit/363d877bd317638b197f57c3591860e1688950d5)
> 
> ```shell
> >  module-reproducer/run.sh
> 
> Building sensor_data.h
> Building tensor.h
> Building base.cc
> In module 'sensor_data':
> ../../eigen/Eigen/src/Core/../plugins/CommonCwiseBinaryOps.inc:47:29: 
> warning: inline function 'Eigen::operator*<float>' is not defined 
> [-Wundefined-inline]
>    47 | EIGEN_MAKE_SCALAR_BINARY_OP(operator*, product)
>       |                             ^
> ../../eigen/Eigen/src/Geometry/AngleAxis.h:221:35: note: used here
>   221 |   Vector3 sin_axis = sin(m_angle) * m_axis;
>       |                                   ^
> 1 warning generated.
> ```
> 
> This warning is a new breakage and does not happen without this change 
> (ignore the linker failure). Let me know if you can reproduce or need help 
> reproducing.

Reproduced. Thank you very much!

https://github.com/llvm/llvm-project/pull/83237
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