| CMP0040 |
| ------- |
| |
| The target in the TARGET signature of add_custom_command() must exist. |
| |
| CMake 2.8.12 and lower silently ignored a custom command created with |
| the TARGET signature of :command:`add_custom_command` |
| if the target is unknown. |
| |
| The OLD behavior for this policy is to ignore custom commands |
| for unknown targets. The NEW behavior for this policy is to report an error |
| if the target referenced in :command:`add_custom_command` is unknown. |
| |
| This policy was introduced in CMake version 3.0. CMake version |
| |release| warns when the policy is not set and uses OLD behavior. Use |
| the cmake_policy command to set it to OLD or NEW explicitly. |
