[PATCH] configure: check whether shell is capable of parameter substring processing

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+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH] configure: check whether shell is capable of parameter\r
+       substring processing\r
+Date: Thu,  3 May 2012 21:59:58 +0300\r
+Message-Id: <1336071598-18930-1-git-send-email-tomi.ollila@iki.fi>\r
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+References: <1334589199-25894-1-git-send-email-tomi.ollila@iki.fi>\r
+Cc: Tomi Ollila <tomi.ollila@iki.fi>\r
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+\r
+'configure' script uses parameter substring extensively. It is Posix shell\r
+feature. Original Bourne shell does not have such features. Some systems\r
+still ships such shells as /bin/sh (for compatibility reasons -- shell\r
+scripts written on those platforms are expected to work on 1990's systems).\r
+\r
+Just testing whether parameter substring processing works will make the\r
+shell exit due to syntax error if it is not compatible. Therefore the test\r
+is executed in a subshell -- subshell exits with nonzero value when the\r
+operation in question fails.\r
+\r
+As 'if ! ...' does not work in Bourne shell, Short-circuiting construct\r
+'||' is used to print information message and exit when expected.\r
+---\r
+This is now based on last short talk on IRC. Anyone good with words\r
+care to comment on text content ? :)\r
+\r
+This patch obsoletes:\r
+\r
+id:"1334643263-30207-1-git-send-email-tomi.ollila@iki.fi" , \r
+id:"1334589199-25894-1-git-send-email-tomi.ollila@iki.fi"\r
+and\r
+id:"1333966665-10469-2-git-send-email-Vladimir.Marek@oracle.com"\r
+\r
+ configure |   14 ++++++++++++++\r
+ 1 files changed, 14 insertions(+), 0 deletions(-)\r
+\r
+diff --git a/configure b/configure\r
+index 71981b7..7a13102 100755\r
+--- a/configure\r
++++ b/configure\r
+@@ -1,5 +1,19 @@\r
+ #! /bin/sh\r
+ \r
++# Test whether this shell is capable of parameter substring processing.\r
++( option='a/b'; : ${option#*/} ) 2>/dev/null || {\r
++    echo "\r
++The shell interpreting '$0' is lacking some required features.\r
++\r
++To work around this problem you may try to execute:\r
++\r
++    ksh $0 $*\r
++ or\r
++    bash $0 $*\r
++"\r
++    exit 1\r
++}\r
++\r
+ # Store original IFS value so it can be changed (and restored) in many places.\r
+ readonly DEFAULT_IFS=$IFS\r
+ \r
+-- \r
+1.7.8.2\r
+\r