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Re: MKS Bourne Shell "case" weirdness...

From: Akim Demaille
Subject: Re: MKS Bourne Shell "case" weirdness...
Date: Fri, 26 Sep 2003 11:42:36 +0200
User-agent: Gnus/5.1002 (Gnus v5.10.2) Emacs/21.3 (gnu/linux)

Maybe we should address this issue in Autoconf's code and documentation?

 > Regarding MKS sh and case/esac, I ran into another weird problem
 > during the MKS port which caused us to have to reorder a couple of
 > case switches in  At line 1229, you will find

 >   -L*)
 >      dir=`$echo "X$arg" | $Xsed -e 's/^-L//'`
 >      # We need an absolute path.
 >      [...]
 >   -l*)

 >      if test "X$arg" = "X-lc" || test "X$arg" = "X-lm"; then
 >        case $host in

 > When this case switch gets to the argument -lXm, it enters the first
 > -L*) case instead of the -l*) case.  Reordering the two cased libtool
 > to enter the -l*) case (don't know if -L arguments failed though).
 > Anyways, we've now found out what that problem was caused by:

 >> **************
 >> Knowledge Base Article #20014
 >> How do I make a case statement case-sensitive?
 >> Product(s): Toolkit
 >> Operating System(s): Windows NT, 9x, 2000, ME
 >> Keyword(s): case, sensitive, DUALCASE
 >> Question:
 >> How do I make a case statement case-sensitive?
 >> Answer:
 >> Case statements use the file name generation feature of the shell which is
 >> normally case-insensitive. It is documented in the sh(1) reference. If you
 >> want to make file name generation case-sensitive then set the variable
 >> DUALCASE to a non-zero value.
 >> Example:
 >> case "$1" in
 >> -r*) echo r;;
 >> -R)  echo R;;
 >> *)   echo other
 >> esac
 >> unset DUALCASE
 >> Note that as of version 7.5 a new vaiable has been added. Setting
 >> TK_DUALCASE_IN_CASE_STATEMENTS to any value will make pattern-matching in
 >> case statements case-sensitive. When TK_DUALCASE_IN_CASE_STATEMENTS is not
 >> set, the DUALCASE environment variable determines whether or not
 >> pattern-matching is case-sensitive in the same way it does for file name
 >> generation.
 >> ***********************

 > Setting up DUALCASE near the top of libtool solved the problem.
 > I've grepped through all the Libtool and Autoconf files for any mention
 > of the variable DUALCASE, but I found none.  I would probably go for
 > setting both DUALCASE and TK_DUALCASE_IN_CASE_STATEMENTS to try to get
 > sh to be as sane as possible, but I'm not completely sure I understand
 > the implications of the differences between the two yet (caffeine-level
 > is too low yet).

 >   Lars J

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