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    $(MAKE) clean

    $(MAKE) test1

release: | clean test1

[링크 : http://stackoverflow.com/questions/8496135/parallel-makefile-require-depency-ordering]

Occasionally, however, you have a situation where you want to impose a specific ordering on the rules to be invoked without forcing the target to be updated if one of those rules is executed. In that case, you want to define order-only prerequisites. 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:

targets : normal-prerequisites | order-only-prerequisites

[링크 : https://www.gnu.org/software/make/manual/html_node/Prerequisite-Types.html]

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