[bug #64571] Add option to print targets

[Tim]

Follow-up Comment #4, bug #64571 (project make):


> I'm just not really that convinced that the simplest thing is going to be
useful to people.

People are already using hacky regexes which are even less useful.

> even internal ones etc

Yeah there were some internal targets that I didn't want to show but couldn't
figure out how to do it. If you can help that would be great!

> Even in the comments below someone suggested "especially for phony targets"

I think they meant targets that are *marked* as phony, not the .PHONY target
itself?

> make -pn | sed -n 's/^\([^#][^=]*:\).*/\1/p;'

Hacks like this not working is what finally motivated me to write this patch.

Try it in this directory:
https://github.com/riscv-software-src/riscv-tests/tree/master/isa

Regex version output:
https://gist.github.com/Timmmm/519aeee5f24658855f2f6fb9359643e3
My patch output:
https://gist.github.com/Timmmm/85acf0ab3f00c9a1780579946823d1bb

I feel like I may have missed the point you're making here though. (Note I'm
not remotely a Make expert!)

> I'm just skeptical that this wouldn't degenerate into a morass of
conflicting requests for new features.

Maybe. But this is clearly a highly demanded feature just for
auto-complete/discovery. Seems mean to deny it just because people might ask
for other things too.


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