Copy constraint appended to ctrl L make links

Archive Blender Development
1 
bl_info = {
    "name": "copy constraint in make link",
    "author": "1C0D",
    "version": (1, 0, 0),
    "blender": (2, 81, 0),
    "category": "Object"}

import bpy

def copy_constraint (self, context):

    self.layout.operator("object.constraints_copy")

    return {'FINISHED'}

def register():

    bpy.types.VIEW3D_MT_make_links.append(copy_constraint)


def unregister():
    
    bpy.types.VIEW3D_MT_make_links.remove(copy_constraint)

if __name__ == "__main__":
    register()

thks to the very good manual around script