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Makefile: If target name contains colon (:)

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

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

For example here is a not working snippet:


<span style="color:#323232;">.DEFAULT_GOAL := all
</span><span style="color:#323232;">
</span><span style="color:#323232;">#####
</span><span style="color:#323232;">URLS  = https://foo.example.com
</span><span style="color:#323232;">URLS += https://bar.example.com
</span><span style="color:#323232;">URLS += https://www.example.org
</span><span style="color:#323232;">
</span><span style="color:#323232;">#####
</span><span style="color:#323232;">% :
</span><span style="color:#323232;">	@echo the url is $(*)
</span><span style="color:#323232;">
</span><span style="color:#323232;">#####
</span><span style="color:#323232;">.PHONY : all
</span><span style="color:#323232;">all : $(URLS)
</span>

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:


<span style="color:#323232;">URLS = foo.example.com
</span><span style="color:#323232;">URLS += bar.example.com
</span>

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?

jlsalvador ,

I didn’t try yet: cmcrossroads.com/…/gnu-make-escaping-walk-wild-si…


<span style="color:#323232;">colon := :
</span><span style="color:#323232;">$(colon) := :
</span><span style="color:#323232;">url := https$(:)//something
</span>
pnutzh4x0r ,
@pnutzh4x0r@lemmy.ndlug.org avatar

You can escape the :


<span style="color:#323232;">URLS  = https://foo.example.com
</span><span style="color:#323232;">URLS += https://bar.example.com
</span><span style="color:#323232;">URLS += https://www.example.org
</span>
bahmanm ,
@bahmanm@mastodon.social avatar

@pnutzh4x0r @bahmanm 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 ,
@pnutzh4x0r@lemmy.ndlug.org avatar

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

bahmanm OP ,
@bahmanm@lemmy.ml avatar

Oh, it works 🎉 Thank you!

For posterity here’s a complete example:


<span style="color:#323232;">foo:bar :
</span><span style="color:#323232;">	@echo $(@)
</span>

and then


<span style="color:#323232;">$ make foo:bar
</span><span style="color:#323232;">foo:bar
</span>

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

bahmanm OP ,
@bahmanm@lemmy.ml avatar

Ah…this explains why it works: savannah.gnu.org/bugs/?712#comment16

It’s a new feature \o/

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