Make dynamically generated targets (example/proof of concept)

Makefile

all:
	$(MAKE) $(shell ./targets.sh)

one:
	@echo one

two:
	@echo two

targets.sh

#! /usr/bin/env bash

targets() {
  local targets=(
    one
    two
  )
  echo "${targets[@]}"
}

main() {
  targets
}

main

Sample output:

$ make
make one two
make[1]: Entering directory '/home/knoble/tmp'
one
two
make[1]: Leaving directory '/home/knoble/tmp'

Recursive makes automatically inherit flags passed, so make -j will run everything in parallel.

If the targets were long running build processes, say,

one:
	@sleep 5
	@echo one

two:
	@sleep 5
	@echo two

Then make -j would only wait 5 seconds before outputting one and two (compared to 10 without -j, as each target is serially built).