CVXPY
Maximize
  x
Subject To
Bounds
 x <= 0.0
End
----------------------------------------
AFTER COMPILATION
Minimize
 Obj: -1 x_0
Subject to
 c1: +1 x_0 <= +0
Bounds
 x_0 free
End
----------------------------------------
SCIP
Maximize
 Obj: +1 x
Subject to
Bounds
 -inf <= x <= 0
End