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+?RCS: $Id: d_csh.U 167 2013-05-08 17:58:00Z rmanfredi $
+?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: d_csh.U,v $
+?RCS: Revision 3.0.1.1 1997/02/28 15:32:18 ram
+?RCS: patch61: added full_csh to preserve the full path even when portable
+?RCS:
+?RCS: Revision 3.0 1993/08/18 12:05:53 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?RCS:
+?MAKE:d_csh full_csh: csh Setvar
+?MAKE: -pick add $@ %<
+?S:d_csh:
+?S: This variable conditionally defines the CSH symbol, which
+?S: indicates to the C program that the C-shell exists.
+?S:.
+?S:full_csh:
+?S: This variable contains the full pathname to 'csh', whether or
+?S: not the user has specified 'portability'. This is only used
+?S: in the compiled C program, and we assume that all systems which
+?S: can share this executable will have the same full pathname to
+?S: 'csh.'
+?S:.
+?C:HAS_CSH:
+?C: This symbol, if defined, indicates that the C-shell exists.
+?C:.
+?C:CSH:
+?C: This symbol, if defined, contains the full pathname of csh.
+?C:.
+?X: Previously, I just did $d_csh CSH "$full_csh", but that caused
+?X: problems on VMS where the config.sh extraction program changes
+?X: $undef to a real cpp undef, and they then had #undef CSH ""
+?X: which the compiler didn't like. It's easy to work around this,
+?X: so I did. --AD 3/1998.
+?X: And we don't want to define CSH if !HAS_CSH, but we don't want
+?X: those lines in config.h if they don't need CSH, so protect with ?CSH
+?X: and not ?%<. --RAM, 15/02/2004
+?H:?%<:#$d_csh HAS_CSH /**/
+?H:?CSH:#ifdef HAS_CSH
+?H:?CSH:#define CSH "$full_csh" /**/
+?H:?CSH:#endif
+?H:.
+?LINT:set d_csh
+: get csh whereabouts
+case "$csh" in
+'csh') val="$undef" ;;
+*) val="$define" ;;
+esac
+set d_csh
+eval $setvar
+: Respect a hint or command line value for full_csh.
+case "$full_csh" in
+'') full_csh=$csh ;;
+esac
+