对目标的仅订购先决条件强加订单 [英] Impose an order for Order-only-prerequisites of a target

问题描述

我有一个makefile片段:

I have a makefile snippet:

all: $(objects) 
fresh: all | clean directory
directory: ;mkdir -p OutputDirectory
clean: ;rm $(objects); rm -rf OutputDirectory

在这里，我要确保在执行make fresh-clean时应以directory开头，然后是all.

Here, I want to ensure that when I do make fresh - clean should succeed by directory which should be followed by all.

从语义上讲，这里clean仅作为订购的先决条件可能没有意义.将其假定为必须按一定顺序执行的order only dependency.

Semantically, here it might not make sense for clean to be order only prerequisite. Assume it to some order only dependency that has to be executed in some order.

以下链接显示了类似的问题，但具有正常的依赖性: makefile-强制要求目标-堆栈溢出

The following link shows similar problem but for normal dependencies: makefile - Impose an order for the prerequisites of a target - Stack Overflow

推荐答案

在fresh的配方中，您可以在同一makefile上两次递归地调用make两次，以创建目标目录和all目标:

In fresh's recipe, you could call make twice recursively on the same makefile, for the target that creates the directory and the all target, respectively:

# At the very beginning of the makefile
CURRENT_MAKEFILE :=  $(lastword $(MAKEFILE_LIST))
# ...

.PHONY: all clean fresh

directory := OutputDirectory

all: $(objects) 
fresh: clean
    $(MAKE) -f $(CURRENT_MAKEFILE) $(directory)
    $(MAKE) -f $(CURRENT_MAKEFILE) all

$(directory): ;mkdir -p $@
clean: ;rm -f $(objects); rm -rf $(directory)

这样，目标all在目标$(directory)之前，目标$(directory)在目标clean之前.

This way, the target all is preceded by the target $(directory), which is in turn preceded by clean.

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