It seems that Ipopt doesn't have a C routine that returns its version.

It would be great to have a function that returns the version either as a string or as the three integers (major, minor, patch).

I was looking for this feature in the Julia interface Ipopt.jl, where we might want to query the version of the optimization solver, but the C++ code doesn't expose any such routine.

Not a critical feature, but still useful for verifying the library version of a precompiled library (libipopt.so / libipopt.dylib / libipopt.dll).

Off-topic: I added a routine that returns the version of each HSL linear solver in libHSL if you want to display it like MUMPS. We should probably also do that with SPRAL.