非递归使收缩目标 [英] non-recursive make constrict targets

问题描述

基于本文，我正在尝试重做以下内容的子集我的构建系统是非递归的.实际上效果很好.默认情况下，我通过模板将makefile include的所有相关目录的一部分包含在其中:

Based on this paper, I'm trying to rework a subset of my build system to be non-recursive. It's actually working pretty well. By default, I have part of my makefile include all the relevant directories via a template:

DIRECTORIES = dirA dirB ... etc ...

define import_template
dir := $(1)
include $(1)/Rules.mk
include Rules.mk
endef

$(foreach DIR,$(DIRECTORIES), \
    $(eval $(call import_template,$(DIR)))) 

那些includes建立一个像TGT_BIN这样的变量，就像所有文章一样，它们都可以工作.

Those includes build up a variables like TGT_BIN, a la the paper, that all works.

$ make # does the right thing

但是，我想为用户提供制作这些目录子集的功能.我知道我可以像这样定义DIRECTORIES

However, I want to provide the user the ability to make a subset of those directories. I know I can define DIRECTORIES like:

DIRECTORIES ?= dirA ...

因此:

$ make DIRECTORIES="dirB dirF"

有效.但是有没有办法这样写我的makefile:

works. But is there a way to write my makefile such that:

$ make -j12 dirB dirF

会做同样的事情吗?

推荐答案

假定您要构建每个目录的目标变量(例如TGT_dirB，TGT_dirF等)，那么您要做的就应该很简单添加:

Assuming you have per-directory variables of targets to build (e.g. TGT_dirB, TGT_dirF, etc.) then doing what you want should be as simple as adding:

$(eval $(DIR): $(TGT_$(DIR)))

像这样

进入foreach循环:

$(eval $(call import_template,$(DIR)))$(eval $(DIR): $(TGT_$(DIR)))

将所有每个目录目标添加为目录目标的先决条件.

to add all the per-directory targets as pre-requisites of the directory targets.

并添加

.PHONY: $(DIRECTORIES)

在makefile中的某个位置，以确保make意识到这些对象是虚假的目标，实际上并不意味着目录本身.

somewhere in the makefile to make sure make realizes those are phony targets and don't actually mean the directories themselves.

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