如何推迟 makefile 先决条件中的 foreach 变量扩展？

发布于 2025-01-11 05:31:34 字数 1011 浏览 4 评论 0原文

我有以下 makefile，它从 terraform 输出创建一个 config.json 文件，然后解析该 config.json 文件并创建一个 makefile 列表变量，然后循环该列表并相应地触发目标。目标通过循环列表 abc xyz 将目录从 output/%/csv 复制到 current/%/csv

CONFIG = config.json
tf:
    terraform output -json > $(CONFIG)

config_file: tf
    $(eval obj := $(shell jq -c '.objects.value[]' $(CONFIG)))

output/%/csv : current/%/csv
    mkdir -p $(@D)
    cp -r $< $@

apply: $(foreach X, $(obj), output/$X/csv)

上面的 makefile 给出了一个空输出。我期望这个结果，因为先决条件立即扩展并且具有空值，为了解决这个问题，我添加了 .SECONDEXPANSION: 以使先决条件在延迟阶段扩展。但随后出现错误没有规则来制作目标输出//csv'，apply需要'。停止。 这意味着变量仍然被分配一个空值。

.SECONDEXPANSION:
CONFIG = config.json
tf:
    terraform output -json > $(CONFIG)

config_file: tf
    $(eval obj := $(shell jq -c '.objects.value[]' $(CONFIG)))

output/%/csv : current/%/csv
    mkdir -p $(@D)
    cp -r $< $@

apply: $(foreach $X, $$(obj), output/$$(X)/csv)

我在这里缺少什么东西还是有更好的方法来做到这一点？

原文

I have the following makefile that creates a config.json file from terraform output and then parses that config.json file and creates a makefile list variable, I then loop over that list and trigger targets accordingly. The targets copies the directories from output/%/csv to current/%/csv by looping over the list abc xyz

CONFIG = config.json
tf:
    terraform output -json > $(CONFIG)

config_file: tf
    $(eval obj := $(shell jq -c '.objects.value[]' $(CONFIG)))

output/%/csv : current/%/csv
    mkdir -p $(@D)
    cp -r lt; $@

apply: $(foreach X, $(obj), output/$X/csv)

The above makefile gives an empty output. I expected this result since the prerequisites are expanded immediately and have empty value, to resolve this I added .SECONDEXPANSION: to have the prerequisites expanded in the deferred phase. But then got an error No rule to make target output//csv', needed by apply'. Stop. This means the variables are still assigned an empty value.

.SECONDEXPANSION:
CONFIG = config.json
tf:
    terraform output -json > $(CONFIG)

config_file: tf
    $(eval obj := $(shell jq -c '.objects.value[]' $(CONFIG)))

output/%/csv : current/%/csv
    mkdir -p $(@D)
    cp -r lt; $@

apply: $(foreach $X, $(obj), output/$(X)/csv)

Is there something that I am missing here or is there any better way to do this?

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撩动你心 2025-01-18 05:31:34

没有理由使用 eval 在配方中设置 obj make 变量。在几乎所有示例中，我看到在配方中使用 eval 或 shell make 函数时，这是一个错误。

那么下面的呢？

OBJ     := $(shell terraform output -json | jq -c '.objects.value[]')
TARGETS := $(patsubst %,output/%/csv,$(OBJ))

output/%/csv : current/%/csv
    mkdir -p $(@D)
    cp -r lt; $@

.PHONY: apply
apply: $(TARGETS)

There is no reason to set the obj make variable in a recipe with eval. In almost all examples I saw where eval or shell make functions were used in a recipe it was an error.

What about the following?

OBJ     := $(shell terraform output -json | jq -c '.objects.value[]')
TARGETS := $(patsubst %,output/%/csv,$(OBJ))

output/%/csv : current/%/csv
    mkdir -p $(@D)
    cp -r lt; $@

.PHONY: apply
apply: $(TARGETS)

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