[tz] [PROPOSED 00/12] Assume POSIX.2-1992

[Paul Eggert]

For many years we have maintained code in tzselect and Makefile
intended to port to older platforms that predate POSIX.2-1992.
The only remaining such platform that is still supported by its
supplier is Solaris 10 (2005), which has a shell and related tools
that are still pre-POSIX by default, although POSIX variants are
available.  However, I recently discovered that Solaris 10’s own copy
of tzselect now uses POSIX.2-1992 features and is based on the POSIX
variants.  Now that even Oracle has abandoned its pre-POSIX
environment for TZDB, it’s time for us to follow suit.

This series of patches updates the Makefile and tzselect shell script
to assume POSIX.2-1992 or later.  This simplifies maintenance and
speeds up the code a bit.

Paul Eggert (12):
  Assume POSIX.2 and eschew ‘expr’
  Prefer $(CMD) to `CMD` in Makefile
  Prefer $PWD to $(pwd) in Makefile
  Avoid subshells when possible
  Assume POSIX.2 command substitution
  * tzselect.ksh: Assume POSIX.2 $PWD.
  * tzselect.ksh: Assume POSIX.2 awk.
  Avoid some subshells in tzselect
  Avoid an awk invocation via $'...'
  Use ‘export VAR=VAL’ syntax
  Avoid crash in Solaris 10 /usr/xpg4/bin/make
  Port ! to Solaris make

 .gitignore   |   4 +-
 Makefile     | 343 +++++++++++++++++++++++++--------------------------
 NEWS         |   9 ++
 checknow.awk |   2 +-
 tzselect.ksh | 112 +++++++----------
 workman.sh   |   3 +-
 6 files changed, 231 insertions(+), 242 deletions(-)

--
2.45.1