How do you comment your makefiles?

cross-posted from: https://lemmy.ml/post/6863402

Fed up w/ my ad-hoc scripts to display the targets and variables in a makefile(s), I’ve decided to write a reusable piece of code to do that: https://github.com/bahmanm/bmakelib/issues/81

The first step toward that would be to understand the common commenting styles. So far I have identified 4 patterns in the wild which you can find below.

Are there any style guides/conventions around this topic? Any references to well-written makefiles I can get inspiration from?

A
VAR1 = foo   ## short one-liner comment
my-target:   ## short one-liner comment 
	…
B
# longer comment which 
# may span
# several lines
VAR1 = foo

## comments can be prefixed w/ more than # 
## lorem ipsum dolor
my-target: 
	…
C
#####
# a comment block which is marked w/ several #s on
# an otherwise blank line
#####
VAR1 = foo
D
#####
#>    # heading 1
#     This is a variation to have markdown comments
#     inside makefile comments.
#
#     ## It's a made-up style!  
#     I came up w/ this style and used it to document `bmakelib`.
#     For example: https://is.gd/QtiqyA (opens github)
#&lt;
#####
VAR1 = foo