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Turns out the order-only prerequisite from
8c363688ac173d34c865b8271ade8c845b67fa24 was a false lead. That just
made Make ignore the timestamp on the file and caused it to rebuild the
dependency tree correctly.
Looks like we need an actual dependency on the Rust source files in
order to get the tree working correctly. Can't just call into the
sub-make and have it work.
Change the `RUST_LIB` prerequisite to point to the actual file because
otherwise it always has the latest timestamp, causing `xcodebuild` to
run.
Unfortunately we end up with duplication between this Makefile and the
one in `dome-key-map`, but that seems unavoidable if we want to set up
the dependencies correctly.
Now it finally seems to work right.
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Previously, Make would always run `xcodebuild`. I couldn't figure out
why, but after some looking around and experimenting, it looked to be
due to the `$(RUST_LIB)` prerequisite. Putting it in the order-only
dependencies list seems to fix the never-up-to-date problem.
Also use `:=` instead of `=` when defining `SOURCE_FILES`. During my
research, I came across this recommendation:
> always use := not = for shell (and wildcard, for that matter) for
> performance reasons.
From MadScientist (https://stackoverflow.com/users/939557/madscientist)
on Stack Overflow:
https://stackoverflow.com/questions/26694249/makefiles-using-wildcard-vs-find-for-specifying-source-files/26694693#26694693
Move the `DomeKey` debug product executable path into a variable and use
it as a target to clarify the build target and also allow us to
substitute the variable in the `run` task.
Now finally, `make run` won't re-build the project if no changes have
been made, it'll just run the executable.
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Equivalent of Xcode's "Build & Run" action that we can execute in the
command line.
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Make a sub-make target for the Rust library. We'll want to make this a
dependency of the regular DomeKey `build` target.
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Planning on using this to set up build a dependency on the Rust project.
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