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22 From: Tomi Ollila <tomi.ollila@iki.fi>
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23 To: notmuch@notmuchmail.org
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24 Subject: [PATCH] configure: test shell parameter substring processing and
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26 Date: Mon, 16 Apr 2012 18:13:19 +0300
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27 Message-Id: <1334589199-25894-1-git-send-email-tomi.ollila@iki.fi>
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29 Cc: Tomi Ollila <tomi.ollila@iki.fi>
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44 configure script uses parameter substring extensively. It is Posix shell
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45 feature. Original Bourne shell does not have such features. Some systems
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46 still ships such shells as /bin/sh (for compatibility reasons -- shell
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47 scripts written on those platforms are expected to work in 1990's systems...)
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49 To tackle this situation the beginning of configure attemts to do a silent
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50 parameter substitution in a subshell; in case this fails the subshell exits
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51 with nonzero value which is easy to detect.
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53 The || constructs are used twice. The first one is used as Bourne shell
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54 chokes on 'if ! ... ' construct (and if ...; then :; else do_things; fi
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55 looks stupid). The second one(liner) takes care of the possible future
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56 'set -eu' in the beginning of this script.
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59 This patch obsoletes id:"1333966665-10469-2-git-send-email-Vladimir.Marek@oracle.com"
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61 configure | 14 ++++++++++++++
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62 1 files changed, 14 insertions(+), 0 deletions(-)
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64 diff --git a/configure b/configure
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65 index 71981b7..06fbeff 100755
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71 +# Test whether this sh is capable of parameter substring processing.
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72 +# If not, attempt to locate and launch one which probably can.
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73 +( option=option=value; : ${option#*=} ) 2>/dev/null || {
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74 + if test x"${_NOTMUCH_CONFIGURE-}" = x ; then
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75 + NOTMUCH_CONFIGURE=1; export _NOTMUCH_CONFIGURE
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76 + for x in /bin/ksh /bin/bash /usr/bin/bash
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77 + do test ! -x "$x" || exec "$x" "$0" "$@"
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80 + echo "Cannot find compatible shell to execute '$0'" >&2
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83 +unset _NOTMUCH_CONFIGURE
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85 # Store original IFS value so it can be changed (and restored) in many places.
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86 readonly DEFAULT_IFS=$IFS
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