On 08Nov2019 10:30, David <bouncingc...@gmail.com> wrote:
On Fri, 8 Nov 2019 at 09:43, Cameron Simpson <c...@cskk.id.au> wrote:
[...]
_help:
@echo '_build: make $(py_static_bundle)'
@echo '_deploy_tip: formally deploy the current tip to the dev host
dev tree:'
@echo '_sync_dev: rsync the current working files into the dev tip
tree'
[...]
Things to note:
"Virtual targets" are actions rather than result files, and start with
an underscore.
The default target is _help, which recites a description of the other
targets.
Hi, as you might be aware, the above recipe will not be run if a file
named '_help' exists.
Hence the funny name. I don't make files whole names begin with
underscores.
The Gnu make documentation term for what you call "virtual targets"
is "phony targets", and it discusses them here:
https://www.gnu.org/software/make/manual/html_node/Phony-Targets.html#Phony-Targets
I would add the line:
.PHONY: _help
And similar for all the other phony targets.
If you're using GNU make, go right ahead. But that approach treats
.PHONY like a label to be applied to _its_ dependents. Probably that's
exactly what it does. However, that is the inverse of the normal
target:dependent relationship one puts in Makefiles.
My personal approach is this:
_always:
:
_help: _always
i.e. make the "phony" targets depend on "_always", which are thus always
out of date and thus will always run. You've still to avoid making a
"_always", but that is a smaller thing than the whole "_*" space, if
that is a concern.
Cheers,
Cameron Simpson <c...@cskk.id.au>
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