CVXPY
Maximize
  log1p(x + 1.0)
Subject To
 11: x <= -0.5
Bounds
 x free
End
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AFTER COMPILATION
Either candidate conic solvers (['GUROBI']) do not support the cones output by the problem (ExpCone, NonNeg), or there are not enough constraints in the problem.
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GUROBI
Maximize
  log1p_1[0]
Subject To
 11[0]: x[0] <= -0.5
Bounds
 x[0] free
 log1p_1[0] free
General Constraints
\ log1p_1[0] = log(2 + x[0])
 GC0: log1p_1[0] = NL : ( LOG , -1 , -1 ) ( PLUS , -1 , 0 ) 
  ( CONSTANT , 2 , 1 ) ( VARIABLE , x[0] , 1 )
End