Place c_api_Path_CheckLicense below c_api_Output_SetInterface (#118)

src/C_API.jl

@@ -724,9 +724,7 @@ function solve_mcp(
 )
     @assert length(z) == length(lb) == length(ub)
     n = length(z)
-    if c_api_Path_CheckLicense(n, nnz) == 0
-        return MCP_LicenseError, nothing, nothing
-    elseif nnz > typemax(Cint)
+    if nnz > typemax(Cint)
         return MCP_Error, nothing, nothing
     elseif n == 0
         return MCP_Solved, nothing, nothing
@@ -742,6 +740,11 @@ function solve_mcp(
         # We shouldn't GC output_interface until we exit the GC.@preserve block.
         gc_root[output_interface] = true
         c_api_Output_SetInterface(output_interface)
+        # We need to call `c_api_Path_CheckLicense` _after_ setting the output
+        # interface because CheckLicense may try to print to the screen.
+        if c_api_Path_CheckLicense(n, nnz) == 0
+            return MCP_LicenseError, nothing, nothing
+        end
         o = c_api_Options_Create()
         # Options has a finalizer. We don't want that to run until we exit the
         # GC.@preserve block.