List all targets (sometimes incorrectly referred to as "goals") in a GNU Makefile

list_targets.sh

#
# this gist can be used to list all targets, or - more correctly - rules,
# that are defined in a Makefile (and possibly other included Makefiles)
# and is inspired by Jack Kelly's reply to a StackOverflow question:
#
#   http://stackoverflow.com/questions/3063507/list-goals-targets-in-gnu-make/3632592#3632592
#
# I also found this script - http://www.shelldorado.com/scripts/cmds/targets - which does
# something similar using awk, but it extracts targets from the "static" rules from a single
# Makefile, meaning it ignores any included Makefiles, as well as targets from "dynamic" rules
#
# Notes:
#
# (1) the sed expression is "scraping" the make output, and will hence break of the output format ever changes
# (2) the "-r" option excludes the built-in rules, as these are typically not relevant, but isn't required
# (3) implementation as a shell alias or as a Makefile target left as an exercise to the reader :-)
#

#
# in the directory containing your Makefile:
#
make -rpn | sed -n -e '/^$/ { n ; /^[^ .#][^ ]*:/p ; }'

#
# ... or add a touch of color by highlighting the targets in the rules:
#
make -rpn | sed -n -e '/^$/ { n ; /^[^ .#][^ ]*:/p ; }' | egrep --color '^[^ ]*:'

#
# ... or if you prefer just the list of targets, WITHOUT the dependencies:
#
make -rpn | sed -n -e '/^$/ { n ; /^[^ .#][^ ]*:/ { s/:.*$// ; p ; } ; }'

Embedding into makefile

#(3) implementation as a shell alias or as a Makefile target left as an exercise to the reader :-)

Thank you for your implementation, it was very helpful as I'm not familiar with sed etc. However, it's a bit tricky in case someone wants to embed this piece into his makefile, so here is the solution to save time:
make -rpn | sed -n -e '/^$/ { n ; /^[^ .#][^ ]*:/ { s/:.*$// ; p ; } ; }'
->
make -rpn | sed -n -e '/^$$/ { n ; /^[^ .#][^ ]*:/ { s/:.*$$// ; p ; } ; }'

Apparently make tries to expand single $ (dollar signs), so they need to be escaped with another $ (dollar sign).

Building on top of that I was able to use it to mark all targets as .PHONY

.PHONY: $(shell sed -n -e '/^$$/ { n ; /^[^ .\#][^ ]*:/ { s/:.*$$// ; p ; } ; }' $(MAKEFILE_LIST))

Works perfectly even for targets mentioned as dependencies.

Here there's a good option