Makefile排列 [英] Makefile permutation

问题描述

Bash可能产生排列(笛卡尔积):

Bash can produce permutations (cartesian product):

$ echo {1,2}{a,b}
1a 1b 2a 2b

我想对makefile做类似的事情.这是一个例子生成文件:

I would like to do something similar with a makefile. Here is an example makefile:

all: 1a 1b 2a 2b

如果可能，我想要这样的东西:

I would like something like this if possible:

NOV = 1 2
OSC = a b
all: $(NOV)$(OSC)

但是，当我使用类似的示例时，它只是创建"1 2a b"而不是结合起来.这可能吗?

However when I use an example like that it just creates "1 2a b" instead of combining them. Is this possible?

推荐答案

不需要任何复杂的循环或从shell借用.比这简单得多.

No need for any complex loops or borrowing from shell. It is much simpler than that.

$(foreach p, $(NOV), $(addprefix $p, $(OSC)))

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