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+?RCS: $Id: Inlibc.U,v 1994/10/29 15:55:08 ram Exp $
+?RCS: Copyright (c) 1991-1993, Raphael Manfredi
+?RCS: You may redistribute only under the terms of the Artistic Licence,
+?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 Licence; a copy of which may be found at the root
+?RCS: of the source tree for dist 3.0.
+?RCS: $Log: Inlibc.U,v $
+?RCS: Revision 1994/10/29 15:55:08 ram
+?RCS: patch36: call ./whoa explicitely instead of relying on PATH
+?RCS: Revision 3.0 1993/08/18 12:05:03 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?X: This unit checks for the definition of a given function.
+?X: To use it, say:
+?X: set function d_func
+?X: eval $inlibc
+?MAKE:Inlibc: Csym Whoa Oldconfig
+?MAKE: -pick add $@ %<
+?LINT:define inlibc
+?LINT:use libc
+?S: This shell variable is used internally by Configure to check
+?S: wether a given function is defined or not. A typical use is:
+?S: set function d_func
+?S: eval $inlibc
+?S: That will print a message, saying wether function was found or
+?S: not and set d_func accordingly.
+?T:was tx sym tres td tu var
+: define an is-in-libc? function
+inlibc='echo " "; td=$define; tu=$undef;
+sym=$1; var=$2; eval "was=\$$2";
+case "$reuseval$was" in
+true) ;;
+true*) tx=no;;
+case "$tx" in
+ set $sym tres -f;
+ eval $csym;
+ case "$tres" in
+ true)
+ echo "$sym() found." >&4;
+ case "$was" in $undef) . ./whoa; esac; eval "$var=\$td";;
+ *)
+ echo "$sym() NOT found." >&4;
+ case "$was" in $define) . ./whoa; esac; eval "$var=\$tu";;
+ esac;;
+ case "$was" in
+ $define) echo "$sym() found." >&4;;
+ *) echo "$sym() NOT found." >&4;;
+ esac;;