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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Makefile: If target name contains colon (:) (lemmy.ml)

submitted 1 year ago by bahmanm@lemmy.ml to c/linux@lemmy.ml

6 comments fedilink hide all child comments

cross-posted from: https://lemmy.ml/post/3229278

Suppose I've got a simple #Makefile w/ a few URLs that I'd like to process as dynamic targets.

For example here is a not working snippet:
.DEFAULT_GOAL := all

#####
URLS  = https://foo.example.com
URLS += https://bar.example.com
URLS += https://www.example.org

#####
% :
	@echo the url is $(*)

#####
.PHONY : all
all : $(URLS)
It fails w/

*** target pattern contains no '%'

I believe that's b/c of the character : being part of URLS which confuses Make after expansion (order o

As a workaround, I've removed https:// from all URLs. For example this works:
URLS = foo.example.com
URLS += bar.example.com
I know Make generally doesn't play well w/ targets w/ space or colon in the name but I wonder if the above is the best I can do. What do you think?

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[–] bahmanm@mastodon.social 1 points 1 year ago (1 children)

@pnutzh4x0r @bahmanm@lemmy.ml I'm not at my desk now but I doubt it will work. Make has no notion of escaping as far as I know.

[–] pnutzh4x0r@lemmy.ndlug.org 1 points 1 year ago (1 children)

I just tried it with GNU make 4.3 and it worked.

[–] bahmanm@lemmy.ml 2 points 1 year ago

Oh, it works 🎉 Thank you!

For posterity here's a complete example:

foo\:bar :
	@echo $(@)

and then

$ make foo:bar
foo:bar

Though, TBH, I don't understand how this works 🤦‍♂️ I need to look into Make docs.