Build errors for sage_numerical_backends_[coin, gurobi]

[Peter Mueller]

On up-to-date Archlinux and Manjaro machines, I get build errors of the packages  sage_numerical_backends_coin-9.0b12 and sage_numerical_backends_gurobi-9.3.1 in SageMath version 10.2.rc0. For both packages the error logs look similar.  I don't know if the following is the relevant part of the logs:

  Error compiling Cython file:
  ------------------------------------------------------------
  ...
          if self.is_variable_continuous(variable):
              return v
          else:
              return int(round(v))

      cpdef int ncols(self):
            ^
  ------------------------------------------------------------

  sage_numerical_backends_coin/coin_backend.pyx:924:10: Signature not compatible with previous declaration

-- Peter Mueller

[Dima Pasechnik]

these could be due to the switch to Cython 3, with these optional packages needed porting work

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[Dima Pasechnik]

confirmed, see

https://github.com/sagemath/sage-numerical-backends-coin/issues/9