DL4003 - Multiple CMD instructions

Description

Multiple CMD instructions found. If you list more than one CMD then only the last CMD will take effect.

Goals

• Prevent ignored CMD instructions.
• Encourage a single clear container command per stage.

Specification

1. Track whether a CMD has been seen in the current stage.
2. Reset the tracker on each FROM instruction.
3. When encountering a CMD:
4. If one has already been seen, emit DL4003 for that line.
5. Otherwise record that a CMD is present.
6. Use the message Multiple CMD instructions found. If you list more than one CMD then only the last CMD will take effect.

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