-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to Eric Blake on 7/8/2009 6:46 AM: > According to the zsh developers, 'emulate sh' is insufficient to get zsh > into full POSIX compatibility; you either have to use 'emulate -R sh', or > start with either argv[0] or the environment variable ARGV0 set to sh. > http://thread.gmane.org/gmane.comp.shells.zsh.devel/18760/focus=18763 > > Is this something we need to account for in m4sh? In looking at it further, one of the differences is that zsh enables notify mode (set -b) by default, although POSIX states that notify mode should default to off (set +b). 'emulate sh' does not change the current state of the notify option, but 'emulate -R sh' forces it to off. Generally, notify does not affect non-interactive script behavior, since it only matters when monitor (set -m) is enabled, and that is off by default for non-interactive use. But for parallel testsuites, we really DO want to have notify disabled so that we don't have to deal with asynchronous outputs to stderr as test groups complete. I'm still not sure whether we need to go full force with 'emulate -R sh', as I'm not sure what other options are changed only by the latter, but if m4sh doesn't change to use 'emulate -R sh', then autotest needs to add a line to use 'set +b' before doing parallel tests. Meanwhile, the zsh maintainers are considering patches to make 'set -m' work in a non-interactive environment, although I have not yet had a chance to build a bleeding edge zsh to try it out. - -- Don't work too hard, make some time for fun as well! Eric Blake ebb9@xxxxxxx -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpV3wAACgkQ84KuGfSFAYCypQCgjBhAs8jAPQSxnMRD6UJvIu6K 3Y4AnijacbgXyvQI+qNE2HHuHW4OGxUu =NFBg -----END PGP SIGNATURE----- _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
