Hi Kristaps,
Kristaps Dzonsons BSD.LV wrote on Fri, Aug 31, 2018 at 09:23:33AM +0200:
> Short: is there a way to manage multiple outputs from a single command
> with OpenBSD's make(1)?
>
> Longer story. I have a site that generates a few hundred articles using
> sblg(1). Each output article is indexNNN.html, which depends upon every
> input indexNNN.xml. So a change to any indexNNN.xml must result in
> rebuilding all indexNNN.html using a single command.
>
> In GNU make, I can use the pattern substring match to effect this:
>
> all: index001.html index002.html
>
> index001%html index002%html: index001.xml index002.xml
> sblg -L index001.xml index002.xml
What is wrong with simply
index001.html index002.html: index001.xml index002.xml
sblg -L index001.xml index002.xml
as documented in make(1),
https://man.openbsd.org/make.1#DEPENDENCY_LINES
It works for me, see the mock-up example below.
I have no idea what '%' means, though, and neither the gmake(1)
manual page nor the gmake info page appear to mention it.
> But obviously that's GNU-only. It is, as a fallback, possible to have
> sblg(1) create one output per input and play nice with make(1):
>
> index001.html: index001.xml index002.xml
> sblg -C index001.xml index001.xml index002.xml
>
> But with hundreds of articles (each of which depends upon parsing
> hundreds of articles), those are a lot of wasted cycles.
>
> I currently just use the GNU make, but I'd rather use only stock
> components on the server. Any thoughts?
Here is my test:
$ cat Makefile
all: output1 output2
output1 output2: input1 input2
sh ./sblg
$ cat sblg
echo running sblg... 1>&2
cat input1 input2 > output1
cat input2 input1 > output2
echo sblg done. 1>&2
$ cat input1
content 1
$ cat input2
content 2
$ make
sh ./sblg
running sblg...
sblg done.
$ cat output1
content 1
content 2
$ cat output2
content 2
content 1
$ sed -i 's/2/3/' input2
$ make
sh ./sblg
running sblg...
sblg done.
$ cat output1
content 1
content 3
$ cat output2
content 3
content 1
make(1) does the right thing and only runs ./sblg once, even though
output from "make -n" is misleading:
$ rm -f output*
$ make -n
sh ./sblg
sh ./sblg
