New variable NOOBJLINK

Create 'obj' directory in current directory instead
	a symbolic link to the 'obj' tree if defined. [not set]

Print a warning if 'obj' tree (/usr/obj) does not exist.

Change default 'obj' directory from ``obj.${MACHINE}'' back to
``obj'', unfortunately many Makefiles are wired with the name ``obj''.

Add some comments for variables and targets.

share/mk/bsd.obj.mk

@@ -1,15 +1,46 @@
-#	$Id: bsd.obj.mk,v 1.1 1996/03/24 22:49:16 wosch Exp $
+#	$Id: bsd.obj.mk,v 1.2 1996/04/09 22:43:33 wosch Exp $
+#
+# The include file <bsd.obj.mk> handles creating 'obj' directory
+# and cleaning up object files, log files etc.
+#
+#
+# +++ variables +++
+#
+# BSDSRCDIR	The real path to the system sources, so that 'make obj'
+#		will work correctly. [/usr/src]
+#
+# BSDOBJDIR	The real path to the system 'obj' tree, so that 'make obj'
+#		will work correctly. [/usr/obj]
+#
+# MAKEOBJDIR 	A file name to the directory where the targets 
+#		are built. [obj]
+#
+# NOOBJ		Do not create 'obj' directory if defined. [not set]
+#
+# NOOBJLINK	Create 'obj' directory in current directory instead
+#		a symbolic link to the 'obj' tree if defined. [not set]
+#
+#
+# +++ targets +++
+#
+#	clean:
+#		remove a.out Errs errs mklog ${CLEANFILES} 
+#
+#	cleandir:
+#		remove all of the files removed by the target clean, 
+#		cleandepend (see bsd.dep.mk) and 'obj' directory.
+#
+#	obj:
+#		create 'obj' directory.
+#
 
-# _SUBDIRUSE:
-# BSDSRCDIR?=/usr/src
-# BSDOBJDIR?=/usr/obj
 
 .if defined(MAKEOBJDIR) && !empty(MAKEOBJDIR)
 __objdir = ${MAKEOBJDIR}
 .else
 
 .if defined(MACHINE) && !empty(MACHINE)
-__objdir = obj.${MACHINE}
+__objdir = obj 			# obj.${MACHINE}
 .else
 __objdir = obj
 .endif
@@ -22,17 +53,24 @@ obj:
 .else
 
 obj:	_SUBDIRUSE cleanobj
-	@cd ${.CURDIR}; here=${.CURDIR}; 		\
+.if defined(NOOBJLINK)
-	dest=${BSDOBJDIR}`echo $$here | sed "s,^${BSDSRCDIR},,"`/${__objdir}; \
+	mkdir ${.CURDIR}/${__objdir}
-	if test -d ${BSDOBJDIR}; then 			\
+.else
+	@if test -d ${BSDOBJDIR}; then 			\
+		cd ${.CURDIR}; here=${.CURDIR}; 	\
+		dest=${BSDOBJDIR}`echo $$here |         \
+			sed "s,^${BSDSRCDIR},,"`/${__objdir}; \
 		${ECHO} "$$here/${__objdir} -> $$dest"; \
 		ln -s $$dest ${__objdir}; 		\
 		if test ! -d $$dest; then 		\
 			mkdir -p $$dest; 		\
 		fi; 					\
+	else 						\
+		${ECHO} "obj tree \"${BSDOBJDIR}\" does not exist."; \
 	fi
 .endif
 .endif
+.endif
 
 #
 # cleanup
@@ -48,7 +86,6 @@ cleanfiles:
 cleandepend:
 .endif
 
-
 .if !target(clean)
 clean: _SUBDIRUSE cleanfiles
 .endif