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Who can answer me a Makefile question?
@adi everything you would want to know, any answers, and then some, is on Google. 😂
@adi I can try. I know some things about make at least.
@adi It might be easier to just ask the question. I'm certainly not an expert, but I have worked a bit with it.
@meff I would like to compress a list of files. For each file, create a corresponding .gz file. This is where I am:
all: a.txt.gz b.gz c.gz
a.txt.gz b.gz c.gz: a.txt b c
gzip < ${*:R} > $*
It's BSD make, but you get the idea.
My problem is that when I edit a single file, let's say a.txt, all 3 archives are recreated.
Make sense make would do that. Because a.txt is prerequisite of all other archives as well.
I could separate them in single targets, but the actual file list will be dynamic.
@adi Ugh sorry for not replying. If the file list is dynamic, usually you use something like autoconf to generate the Makefile. I've also used wildcards in the past and that works okay. You should be able to use shell commands to populate the file list.
@meff I can populate the list, I can't map files to the compressed version.
@adi What about this one?
SRCFILES = $(wildcard *)
# remove existing *.gz (actually doubles entries)
CLEANSRC = $(SRCFILES:.gz=)
DSTFILES = $(addsuffix .gz, $(CLEANSRC))
%.gz: %
gzip -c $< > $<.gz
all: $(DSTFILES)
You must not have subdirectories in that folder, though.
@adi What about this one?
SRCFILES = $(wildcard *)
# remove existing *.gz (actually doubles entries)
CLEANSRC = $(SRCFILES:.gz=)
DSTFILES = $(addsuffix .gz, $(CLEANSRC))
%.gz: %
\tgzip -c $< > $<.gz
all: $(DSTFILES)
You must not have subdirectories in that folder, though.
@adi Not sure if I got this correctly, but if a compressed version relies just on its uncompressed pendant, then something like that should work: https://lyse.isobeef.org/tmp/Makefile Not sure, if this uses any GNU specific stuff, though. And for simplicity I just assumed *.txt files. Your example also shows files without extension, so it probably needs a slight adjustment. If there are too many different file types it might be easier to write a script that generates the Makefile. I don't know of anything simpler. Btw, I never saw ${*:R}, what's that supposed to do?
@stackeffect I guess this works with subdirectories also:
SRCFILES != find . -type f ! -name '*.gz'
DSTFILES = $(addsuffix .gz, $(SRCFILES))
%.gz: %
gzip -c $< > $<.gz
all: $(DSTFILES)
Have no idea how to make it portable tho.
%.gz: %
gzip -c $< > $<.gz
Doesn't work with BSD make.
Plan9 mk solution:
fs={find . -type f ! -name '*.gz'}
 gzs=${fs:%=%.gz}
 all:V: $gzs
 clean:
 rm -rf *.gz
 %.gz: %
 gzip -c < $prereq > $prereq.gz