Suppress license output from solver in JuMP.Model

Specific Domains Optimization (Mathematical)
4

As others have mentioned, the message comes from Gurobi when getting the Gurobi environment. The solution is to get the environment just once, and then re-use that environment:

julia> gurobi_env = Gurobi.Env()
Academic license - for non-commercial use only
Gurobi.Env(Ptr{Nothing} @0x000000002cd049f0)

julia> m = Model(with_optimizer(Gurobi.Optimizer, gurobi_env))
A JuMP Model
Feasibility problem with:
Variables: 0
Model mode: AUTOMATIC
CachingOptimizer state: EMPTY_OPTIMIZER
Solver name: Gurobi

julia> m = Model(with_optimizer(Gurobi.Optimizer, gurobi_env))
A JuMP Model
Feasibility problem with:
Variables: 0
Model mode: AUTOMATIC
CachingOptimizer state: EMPTY_OPTIMIZER
Solver name: Gurobi

Notice that each model creation doesn’t trigger a printed warning about the academic license.

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