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Martijn Dekker e856094ca2 Fix build scripts so ksh compiles on recent macOS (Mac OS X) 
This updates the cc.darwin* compiler compatibility wrapper scripts
and patches bin/package to identify a 64-bit system, allowing ksh
to build using a simple 'bin/package make' command on at least on
macOS Mojave (10.14.6). Testing on other macOS versions is invited.

src/cmd/INIT/cc.darwin:
- Remove obsolete compatibility cruft
- Update compiler flags:
  * remove obsolete/unneeded -DCLK_TCK=100 (this is already defined
    in the system header i386/limits.h included by time.h)
  * add necessary flags from Apple's Makefile in ksh-27.tar.gz:
    -DSHOPT_SPAWN=0 -D_ast_int8_t=int64_t -D_lib_memccpy
    source: https://opensource.apple.com/tarballs/ksh/
  * add -Wno-unused-value and -Wno-parentheses to suppress excessive
    clang warnings that object to David Korn's coding style.
- Update linker flags:
  * remove obsolete -Wl,-m
  * add flag from Apple's Makefile: -Wl,-search_paths_first

src/cmd/INIT/cc.darwin.i386,
src/cmd/INIT/cc.darwin.i386-64:
- Removed as superfluous (was identical to generic cc.darwin).

bin/package,
src/cmd/INIT/package.sh:
- Fix the recognition of a 64-bit system from the output of a 'file
  /bin/sh' command (what an ugly hack... never mind), so that the
  architecture is correctly identified as darwin.i386-64.

(cherry picked from commit e74e98b886a2bc5760166c124412474293f85fd8)
2020-06-12 01:45:13 +02:00
bin Fix build scripts so ksh compiles on recent macOS (Mac OS X) 2020-06-12 01:45:13 +02:00
docs Fix 181 typos in user-facing documentation 2020-06-12 01:45:12 +02:00
lib/package Fix 181 typos in user-facing documentation 2020-06-12 01:45:12 +02:00
src Fix build scripts so ksh compiles on recent macOS (Mac OS X) 2020-06-12 01:45:13 +02:00
.gitignore Rebooting 93u+m 2020-06-12 01:43:13 +02:00
LICENSE.md Create LICENSE.md 2020-02-12 14:03:19 -05:00
NEWS Fix BUG_REDIRIO 2020-06-12 01:45:13 +02:00
README.md Rebooting 93u+m 2020-06-12 01:43:13 +02:00
TODO TODO: add items about broken default aliases 2020-06-12 01:45:13 +02:00

README.md

KornShell 93u+m

This repository is used to develop bugfixes to the last stable release (93u+ 2012-08-01) of ksh93, formerly developed by AT&T Software Technology (AST). The sources in this repository were forked from the Github AST repository which is no longer under active development.

To see what's fixed, see NEWS and click on commit messages for full details.

To see what's left to fix, see TODO.

Policy

  1. No new features. Bug fixes only.
  2. No major rewrites. No refactoring code that is not fully understood.
  3. No changes in documented behaviour, except if required for compliance with the POSIX shell language standard which David Korn intended for ksh to follow.
  4. No 100% bug compatibility. Broken and undocumented behaviour gets fixed.
  5. No bureaucracy, no formalities. Just fix it, or report it: create issues, send pull requests. Every interested party is invited to contribute.
  6. To help increase everyone's understanding of this code base, fixes and significant changes should be fully documented in commit messages.

Why?

Between 2017 and 2020 there was an ultimately unsuccessful attempt to breathe new life into the KornShell by extensively refactoring the last unstable AST beta version (93v-). While that ksh2020 branch is now abandoned and still has many critical bugs, it also had a lot of bugs fixed. More importantly, the AST issue tracker now contains a lot of documentation on how to fix those bugs, which makes it possible to backport many of them to the last stable release instead.

In February 2020, having concluded the AST 93v- beta was too broken to base new work on, others decided to start a new fork based on the last stable 93u+ 2012-08-01 release. Unfortunately, as of June 2020, the new ksh-community organisation is yet to see any significant activity four months after its bootstrapping. I hope that will change; I am ready to join efforts with them at any time, as well as anyone else who wants to contribute.

The last stable ksh93 release from 2012 is the least buggy release currently available, but it still has many serious bugs. So it is well past time to start fixing those bugs, leave the rest of the code alone, and get an improved release out there.

Build

After cloning this repo, cd to the top directory of it and run:

./bin/package make

If you have trouble or want to tune the binaries, you may pass additional compiler and linker flags by appending it to the command shown above. E.g.:

./bin/package make \
    SHELL=/bin/bash CCFLAGS="-xc99 -D_XPG6 -m64 -xO4" LDFLAGS="-m64"

For more information run

        bin/package help

Many other commands in this repo self-document via the --help, --man and --html options; those that do have no separate manual page.

Test

After compiling, you can run the regression tests. Start by reading the information printed by:

./bin/shtests --man