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Diffstat (limited to 'mcon/U/Setvar.U')
| -rw-r--r-- | mcon/U/Setvar.U | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/mcon/U/Setvar.U b/mcon/U/Setvar.U new file mode 100644 index 0000000..ab83bf5 --- /dev/null +++ b/mcon/U/Setvar.U @@ -0,0 +1,50 @@ +?RCS: $Id$ +?RCS: +?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi +?RCS: +?RCS: You may redistribute only under the terms of the Artistic License, +?RCS: as specified in the README file that comes with the distribution. +?RCS: You may reuse parts of this distribution only within the terms of +?RCS: that same Artistic License; a copy of which may be found at the root +?RCS: of the source tree for dist 4.0. +?RCS: +?RCS: $Log: Setvar.U,v $ +?RCS: Revision 3.0.1.1 1994/10/29 15:58:28 ram +?RCS: patch36: call ./whoa explicitly instead of relying on PATH +?RCS: +?RCS: Revision 3.0 1993/08/18 12:05:16 ram +?RCS: Baseline for dist 3.0 netwide release. +?RCS: +?X: +?X: This unit produces a variable that is intended to be eval'ed in +?X: order to define/undefine a symbol. A consistency check is made +?X: regarding any previous value and a warning is issued if there +?X: is any discrepancy. +?X: +?X: To use it, say: +?X: val=<value> +?X: set d_variable +?X: eval $setvar +?X: +?MAKE:Setvar: Whoa +?MAKE: -pick add $@ %< +?LINT:define setvar +?S:setvar: +?S: This shell variable is used internally by Configure to set a value +?S: to a given symbol that is defined or not. A typical use is: +?S: val=<value computed> +?S: set d_variable +?S: eval $setvar +?S: That will print a message in case the $val value is not the same +?S: as the previous value of $d_variable. +?S:. +?V:setvar:val +?T:var was td tu +: function used to set '$1' to '$val' +setvar='var=$1; eval "was=\$$1"; td=$define; tu=$undef; +case "$val$was" in +$define$undef) . ./whoa; eval "$var=\$td";; +$undef$define) . ./whoa; eval "$var=\$tu";; +*) eval "$var=$val";; +esac' + |