bug#33919: [PATCH 0/5] Add Zstandard compression for installation and utilities

[Alex]

I figured that it would be nice to support other compression programs
for installed files, and Zstandard[1] seems like a good alternative
for gzip in this area due to its fast decompression and wide range of
options.

This patch series depends on the patch I posted for bug#33880[2].

I have a few questions/comments:

1) I tested about everything except the Tramp part. One possible issue
is that zstd prints a progress/summary line to stdout without the -q
flag when compressing a single file; does Tramp care about that here?

2) Is there a convenient method to avoid the duplication of setting up
the COMPR* (and perhaps other) variables in the doc/*/Makefile.in
files?  What about making a common file that other files load at the
beginning?

3) Hopefully using eval is not an issue here.  I believe the security
should be the same, since I double quoted the filename strings (which
I confirmed could be used to execute code without the extra quotes),
and the old GZIP_PROG could also be exploited.

[1] https://facebook.github.io/zstd/
[2]
https://lists.gnu.org/archive/html/bug-gnu-emacs/2018-12/msg00926.html

Alexander Gramiak (5):
  Add Zstandard compression support for etags
  Add Zstandard compression support for dired
  Add Zstandard compression support for Tramp
  * make-dist: Add option for zstd compression
  Add Zstandard compression option for make install

 INSTALL                   | 34 +++++++++++++++++++----
 Makefile.in               | 57 ++++++++++++++++++++++++++-------------
 admin/admin.el            |  2 +-
 configure.ac              | 36 ++++++++++++++++++-------
 doc/emacs/Makefile.in     | 25 ++++++++++++-----
 doc/lispintro/Makefile.in | 25 ++++++++++++-----
 doc/lispref/Makefile.in   | 25 ++++++++++++-----
 doc/man/etags.1           |  2 +-
 doc/misc/Makefile.in      | 25 ++++++++++++-----
 doc/misc/tramp.texi       |  9 ++++---
 etc/NEWS                  | 30 +++++++++++++++++++++
 lib-src/etags.c           |  3 ++-
 lisp/dired-aux.el         | 21 ++++++++++-----
 lisp/jka-cmpr-hook.el     |  4 +--
 lisp/net/tramp-archive.el |  8 +++---
 lisp/net/tramp-sh.el      |  1 +
 make-dist                 |  8 +++++-
 17 files changed, 239 insertions(+), 76 deletions(-)

0001-Add-Zstandard-compression-support-for-etags.patch
Description: Text Data

0002-Add-Zstandard-compression-support-for-dired.patch
Description: Text Data

0003-Add-Zstandard-compression-support-for-Tramp.patch
Description: Text Data

0004-make-dist-Add-option-for-zstd-compression.patch
Description: Text Data

0005-Add-Zstandard-compression-option-for-make-install.patch
Description: Text Data