Error using ipopt

[rmndrs89]

When I was trying to run the basic example from the README.md, I ran into the following error:

>> result = solver.solve(problem);
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Jacobian sparsity: 26254 nonzero elements out of 9156808 (0.287%).
Error using ipopt (line 274)
mexIPOPT do not support gcc < gcc6

Error in IPOPT/solve (line 161)
            [X, info] = ipopt(X0,funcs,options);
                        ^^^^^^^^^^^^^^^^^^^^^^^

I have checked the current version of gcc:

$ gcc --version
gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Probably the error comes from the Add-On mexIPOPT, but how would I approach this?

BR

[adkoele]

Hi!

Indeed, the problem seems to be here (https://github.com/ebertolazzi/mexIPOPT/blob/820aa5bb36eed2f4d0614d01f57ea6330939227a/toolbox/lib/ipopt.m#L272) in line 272. The ipopt package only checks the first digit of the gcc version, so 11 turns to 1, which is ancient.

There is already an issue on their git: ebertolazzi/mexIPOPT#22

For now, the fastest solution would be to change the gcc version to below 10, but it is not ideal long-term. For now, it would mean that, at least in Linux, the gcc version cannot be larger than 9.