Targets without a particular build phase will not perform operations

[burtlo]

I recently added some warning messages to ensure that targets that do not have particular build phases give good feedback and prevent the installation from failing. However, I was wondering what people would think:

• Should Vendor add build phases to a specified target (if it is allowable for the build target)?
• Should it be done when a user explicitly specifies a target?
• Should it be done by default?
• Should it prompt the user through the installation process?