custom.cmake.in.i:1: Error: Illegal token '�'.

[dumpinfo]

python/bolt/config.i:46: Warning 315: Nothing known about 'Eigen::Dynamic'.
python/bolt/config.i:46: Warning 315: Nothing known about 'Eigen::Dynamic'.
python/bolt/config.i:47: Warning 315: Nothing known about 'Eigen::RowMajor'.
python/bolt/config.i:45: Warning 315: Nothing known about 'Eigen::Matrix'.
python/bolt/config.i:46: Warning 315: Nothing known about 'Eigen::Dynamic'.
python/bolt/config.i:46: Warning 315: Nothing known about 'Eigen::Dynamic'.
python/bolt/config.i:47: Warning 315: Nothing known about 'Eigen::RowMajor'.
python/bolt/config.i:46: Warning 315: Nothing known about 'Eigen::Dynamic'.
python/bolt/config.i:46: Warning 315: Nothing known about 'Eigen::Dynamic'.
python/bolt/config.i:47: Warning 315: Nothing known about 'Eigen::RowMajor'.
python/bolt/config.i:45: Warning 315: Nothing known about 'Eigen::Matrix'.
python/bolt/config.i:46: Warning 315: Nothing known about 'Eigen::Dynamic'.
python/bolt/config.i:46: Warning 315: Nothing known about 'Eigen::Dynamic'.
python/bolt/config.i:47: Warning 315: Nothing known about 'Eigen::RowMajor'.
swigging cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i to cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in_wrap.cpp
swig -python -c++ -o cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in_wrap.cpp cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i
cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i:1: Error: Illegal token '�'.
cpp/src/external/eigen/.hg/store/data/_c_test_custom.cmake.in.i:1: Error: Syntax error in input(1).
error: command 'swig' failed with exit status 1

[vipwp]

same issue on ubuntu 20.04.

python:3.8.1
swig:4.0.1
gcc: 9.3.0

[edwardduanhao]

Same Issue here.
ubuntu 20.04
python:3.8.10
swig:4.0.2
GCC: 9.3.0

[dblalock]

This looks like the same issue as #4. Going to go ahead and close this so we can have all the discussion in one place, but feel free to reopen if it looks like your issue is different.