Re: [PATCH 00/11] Makefile: fix "Perl" and "Python" rules, speed up re-builds

> This topic is split-up from v4 of ab/make-dependency[1]. Range-diff to
> it below. As noted in [2] I opted to split up that series rather than
> having it grow too large.
>
> This is miscellanious cleanups related to the "Perl" rules, and some
> fixes for bad dependency rules in 08/11. Then in 10/11 we make the
> "Python" rules use the new template we created for "Perl",
>
> We are then able to speed up "make" re-builds a bit in 11/11, as we
> don't need to inject @@GIT_VERSION@@ into the Perl scripts anymore.
>
> The 09/11 is new. It's a trivial sorting of the PERL_DEFINES list,
> which'll help to maintain it in the future.
>
> 1. https://lore.kernel.org/git/cover-v4-00.23-00000000000-20211117T101807Z-avarab@gmail.com/
> 2. https://lore.kernel.org/git/211217.86a6h09km9.gmgdl@evledraar.gmail.com/
>
>
> Ævar Arnfjörð Bjarmason (11):
>   Makefile: clean perl/build/ even with NO_PERL=Y
>   Makefile: don't set up "perl/build" rules under NO_PERL=Y
>   Makefile: use "=" not ":=" for po/* and perl/*
>   Makefile: remove "mv $@ $@+" dance redundant to .DELETE_ON_ERROR
>   Makefile: guard Perl-only variable assignments
>   Makefile: change "ifndef NO_PERL" to "ifdef NO_PERL"
>   Makefile: adjust Perl-related comments & whitespace
>   Makefile: correct "GIT-PERL-{DEFINES,HEADER}" dependency graph
>   Makefile: sort PERL_DEFINES list
>   Makefile: create a GIT-PYTHON-DEFINES, like "PERL"
>   Makefile: stop needing @@GIT_VERSION@@ in *.perl scripts
>
>  .gitignore          |   2 +-
>  Makefile            | 160 +++++++++++++++++++++++---------------------
>  git-cvsserver.perl  |   6 +-
>  git-send-email.perl |   7 +-
>  git-svn.perl        |   2 +-
>  5 files changed, 90 insertions(+), 87 deletions(-)
>
> Range-diff:
>  1:  1621ca72c1d <  -:  ----------- Makefile: don't invoke msgfmt with --statistics
>  4:  daead5ec293 =  1:  185f5a9a9cf Makefile: clean perl/build/ even with NO_PERL=Y
>  2:  b7c36c9fea0 =  2:  37eeccc5646 Makefile: don't set up "perl/build" rules under NO_PERL=Y
>  3:  29b000eb0f1 =  3:  572a82c71a1 Makefile: use "=" not ":=" for po/* and perl/*
>  5:  3c987590740 =  4:  5baff22f5af Makefile: remove "mv $@ $@+" dance redundant to .DELETE_ON_ERROR
>  6:  b57f582ccd3 =  5:  992e325491d Makefile: guard Perl-only variable assignments
>  7:  fcdee92f64c =  6:  5e94ef729fe Makefile: change "ifndef NO_PERL" to "ifdef NO_PERL"
>  8:  1e25b532ca2 =  7:  4eeef8571aa Makefile: adjust Perl-related comments & whitespace
>  9:  77d9855bfcf =  8:  8aa35537b08 Makefile: correct "GIT-PERL-{DEFINES,HEADER}" dependency graph
>  -:  ----------- >  9:  5ff768a5cec Makefile: sort PERL_DEFINES list
> 10:  6004cdcd8d9 = 10:  fe79797f45e Makefile: create a GIT-PYTHON-DEFINES, like "PERL"
> 11:  17b30e96057 = 11:  defbd9b6db2 Makefile: stop needing @@GIT_VERSION@@ in *.perl scripts
> 12:  30ddf7da2c8 <  -:  ----------- Makefiles: add "shared.mak", move ".DELETE_ON_ERROR" to it
> 13:  f378a7dc35e <  -:  ----------- Makefile: move $(comma), $(empty) and $(space) to shared.mak
> 14:  13cbb851d32 <  -:  ----------- Makefile: re-add and use the "shellquote" macros
> 15:  337953e4994 <  -:  ----------- Makefile: add a "TRACK_template" for GIT-*{FLAGS,DEFINES,...}
> 16:  5bb597c1993 <  -:  ----------- Makefile: add "$(QUIET)" boilerplate to shared.mak
> 17:  3c4d0589667 <  -:  ----------- Makefile: use $(wspfx) for $(QUIET...) in shared.mak
> 18:  be5882b2c99 <  -:  ----------- Makefiles: add and use wildcard "mkdir -p" template
> 19:  2710f8af6cd <  -:  ----------- Makefile: correct the dependency graph of hook-list.h
> 20:  59f22a0269a <  -:  ----------- Makefile: use $(file) I/O instead of "FORCE" when possible
> 21:  dd569a59c74 <  -:  ----------- Makefile: disable GNU make built-in wildcard rules
> 22:  4168a7e3b30 <  -:  ----------- Makefile: define $(LIB_H) in terms of $(FIND_SOURCE_FILES)
> 23:  48a3927d972 <  -:  ----------- Makefile: move ".SUFFIXES" rule to shared.mak