#!/bin/sh
#
# $Id$
#
#  Retrieve a variable value from EPICS configuration makefiles.
#	by Matthew Needes
#
#  Syntax:
#	GetVar VAR_NAME [TARGET_ARCH]
#
#  If TARGET_ARCH is NOT specified, only those general variables in
#	CONFIG_SITE are available.
#
#  If TARGET_ARCH is specified, all EPICS target specific variables
#	are accessable in addition to all general variables.
#
# $Log$
# Revision 1.10  1995/08/18  15:26:39  jba
# Added pathname to gmake
#
# Revision 1.9  1995/08/17  20:30:00  jba
# EPICS now passed as param - FindEpics removed
#
# Revision 1.8  1994/10/25  15:55:28  winans
# Changed 'make' to 'gmake' for performing make operations.
#
# Revision 1.7  1994/10/05  18:39:27  jba
# Modified syntax of makefile usage
#
# Revision 1.6  1994/09/22  01:41:44  mcn
# MakeRelease - MAJOR bug fix.  GetVar / MakeDirs - minor fix.
#
# Revision 1.5  1994/09/08  13:47:08  mcn
# Fixed GetVar's inclusions.
#
# Revision 1.4  1994/09/07  20:59:13  mcn
# Revamped GetVar, modified scripts for new GetVar.
#
# Revision 1.3  1994/09/07  19:08:49  jba
# Modified to work with extensions and do depends
#
# Revision 1.2  1994/08/21  00:56:38  mcn
# New Stuff
#
# Revision 1.1  1994/08/16  16:12:18  mcn
# Added GetVar, made use of 'ln' compatible with SYSV Unix.
#
#


if [ -z "$2" ]; then
	echo "usage: $0 EPICS VAR_NAME [TARGET_ARCH]"
	exit 1
fi

EPICS=$1

INCLUDE=${EPICS}/config/CONFIG_BASE

if [ -z "$3" ]; then
	OPTS=""
else
	OPTS="T_A=$3"
fi

PID=$$

# Construct temporary makefile
cat - <<MFILE > /tmp/Makefile.tmp.$$

EPICS=$EPICS

include ${INCLUDE}

all:
	@echo "\$($2)" > /tmp/Makefile.tmp.out.$PID

MFILE

gnumake -f /tmp/Makefile.tmp.$$ $OPTS > /dev/null

# Display value
cat /tmp/Makefile.tmp.out.$$

rm -f /tmp/Makefile.tmp.$$ /tmp/Makefile.tmp.out.$$

exit 0