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build system: modernise shell compatibility checks
All changed files: - Put the shell in POSIX mode if it has an '-o posix' option. - Remove nonsense disabling 'set -x' on bash. It's not broken. bin/package, src/cmd/INIT/package.sh: - Add check blocking native zsh mode (e.g., "$path" conflicts). Using a 'sh -> zsh' symlink works, so recommend that. - Remove old ksh93 version check for a supposed conflict with libcmd. It was broken; it would revert to /bin/sh, but on illumos distributions, /bin/sh is a ksh93 of a version that is supposedly affected. It builds fine anyway. - Rewrite checksh() to incorporate the shell compatibility checks that were previously in two different places in 'package'. bin/ignore, src/cmd/INIT/ignore.sh, bin/silent, src/cmd/INIT/silent.sh: - Change bad check for a full POSIX 'export' command (no, $RANDOM has nothing to do with that) with a proper feature test.
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20 changed files with 113 additions and 128 deletions
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@ -21,9 +21,7 @@
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# mamprobe - generate MAM cc probe info
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# Glenn Fowler <gsf@research.att.com>
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case $-:$BASH_VERSION in
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*x*:[0123456789]*) : bash set -x is broken :; set +ex ;;
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esac
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(set -o posix) 2>/dev/null && set -o posix
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command=mamprobe
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