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Does order matter in a makefile?
The order of rules is not significant, except for determining the default goal: the target for make to consider, if you do not otherwise specify one. The default goal is the target of the first rule in the first makefile. If the first rule has multiple targets, only the first target is taken as the default.
How do I make a file in order?
Sort Files and Folders
- In the desktop, click or tap the File Explorer button on the taskbar.
- Open the folder that contains the files you want to group.
- Click or tap the Sort by button on the View tab.
- Select a sort by option on the menu. Options.
How are order only prerequisites specified in GNU make?
Order-only prerequisites can be specified by placing a pipe symbol (|) in the prerequisites list: any prerequisites to the left of the pipe symbol are normal; any prerequisites to the right are order-only: The normal prerequisites section may of course be empty.
When does GNU make run in the right order?
If there are no dependencies between x, y and z, and no parallel execution, GNU make appears to run them in the order you specified them, but this is not guaranteed in the docs. The make utilities in most historical implementations process the prerequisites of a target in left-to-right order, and the makefile format requires this.
When to use order only prerequisites in make?
For an order-only prerequisite on the other hand, make does not mark the target as needing an update. For example see the section Types of Prerequisites for a use case where a directory should be created before the objects in that directory are created.
When do normal and order prerequisites take precedence?
Note that if you declare the same file to be both a normal and an order-only prerequisite, the normal prerequisite takes precedence (since they have a strict superset of the behavior of an order-only prerequisite). Consider an example where your targets are to be placed in a separate directory, and that directory might not exist before make is run.