Dear all,
I want to set up a Makefile to handle installation and checking etc.
of a bunch of R packages, and I'd like to be able to add a new
package by just adding the new name to a variable. I use implicit
rules to try and pull this off. The problem I run into is that make
cannot
be bothered to make prerequisites required by an implicit rule, but in
my
case, that's what I need.
Here's my Makefile:
RPACKS = xpipe jtkstuff
RPACKS_INSTALL = $(RPACKS:%=%-install)
RPACKS_UNINSTALL = $(RPACKS:%=%-uninstall)
RPACKS_CHECK = $(RPACKS:%=%-check)
install : $(RPACKS_INSTALL)
# explicit rule: target is unconditionally made
jtkstuff-install :
echo target: $@ prerequisites: $^
R CMD INSTALL jtkstuff
# implicit rule: nothing is made
%-install :
echo target: $@ prerequisites: $^
R CMD INSTALL $*
.PHONY : install uninstall check clean $(RPRACKS) $(RPACKS_INSTALL)
make -n -d install shows the problem:
Updating goal targets....
Considering target file `install'.
File `install' does not exist.
Considering target file `xpipe-install'.
File `xpipe-install' does not exist.
Finished prerequisites of target file `xpipe-install'.
Must remake target `xpipe-install'.
Successfully remade target file `xpipe-install'.
Considering target file `jtkstuff-install'.
File `jtkstuff-install' does not exist.
Finished prerequisites of target file `jtkstuff-install'.
Must remake target `jtkstuff-install'.
echo target: jtkstuff-install prerequisites:
R CMD INSTALL jtkstuff
Successfully remade target file `jtkstuff-install'.
Finished prerequisites of target file `install'.
Must remake target `install'.
Successfully remade target file `install'.
Obviously, make handles the explicit jtkstuff-install rule differently
from the implicit %-install rule in that it does execute the commands
for the former while it considers the implicitly specified target
xpipe-install to be remade without actually doing anything.
Is there any way to change this behaviour?
Regards & thanks in advance, Jan
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