Symbol not found: _CCtsp_solve_dat - Error after installing pyconcorde

I’m using Python 3.8.1 on Mac OS X 10.15.2 (brew-based) with Xcode 11.3.1. I’ve succefully installed pyconcorde without any errors but when I import TSPSolver using from concorde.tsp import TSPSolver I’m getting the “Symbol not found: _CCtsp_solve_dat” error. It seems concorde/tsp.py cannot import _CCtsp_solve_dat from concorde._concorde in line 10.

What I run: >>> from concorde.tsp import TSPSolver What I get:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/a/pyconcorde/concorde/tsp.py", line 10, in <module>
    from concorde._concorde import _CCutil_gettsplib, _CCtsp_solve_dat
ImportError: dlopen(/Users/a/pyconcorde/concorde/_concorde.cpython-38-darwin.so, 2): Symbol not found: _CCtsp_solve_dat
  Referenced from: /Users/a/pyconcorde/concorde/_concorde.cpython-38-darwin.so
  Expected in: flat namespace
 in /Users/a/pyconcorde/concorde/_concorde.cpython-38-darwin.so

[jvkersch]

@iliailmer Thanks for the follow-up. I am not sure about how to support the M1. One thing to note is that I am planning to move to a new API that runs Concorde in a subprocess (see https://github.com/jvkersch/pyconcorde/issues/28#issuecomment-770354999). If you can get Concorde to compile and run on your platform, then this new API should be compatible with it. I’d be very interested in hearing your experiences.

[DangerousDyl]

Hi I am receiving the same issue:

dlopen(/Users/dylanjohnson/gnn-tsp/pyconcorde/concorde/_concorde.cpython-39-darwin.so, 0x0002): symbol not found in flat namespace '_QSadd_cols'

Thanks, Dylan