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

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

3 comments fedilink hide all child comments

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?

top 3 comments

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[–] pnutzh4x0r@lemmy.ndlug.org 5 points 1 year ago

You can escape the :

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

[–] jlsalvador@lemmy.ml 2 points 1 year ago (1 children)

I didn't try yet: https://www.cmcrossroads.com/article/gnu-make-escaping-walk-wild-side

colon := :
$(colon) := :
url := https$(:)//something

[–] bahmanm@lemmy.ml 3 points 1 year ago

Unfortunately didn't work. I got the same *** target pattern contains no ‘%’ error.