for review: mmake: turn off undefined variable warnings

[Fergus Henderson]

scripts/mmake.in:
	Make the warnings about undefined variables optional,
	with the default being that they are not enabled.

Index: scripts/mmake.in
===================================================================
RCS file: /home/mercury1/repository/mercury/scripts/mmake.in,v
retrieving revision 1.25
diff -u -r1.25 mmake.in
--- mmake.in	1998/06/28 07:46:09	1.25
+++ mmake.in	1998/07/09 19:38:11
@@ -30,6 +30,11 @@
 		your Mmake file.
 	-v, --verbose:
 		Print verbose progress messages.
+	-w, --warn-undefined-vars:
+		Warn about variable which are used but not defined.
+		(This warning is disabled when doing \`mmake clean'
+		or \`mmake depend' or the like, to avoid spurious
+		warnings when the dependencies have not yet been made.)
 	-h, --help:
 		Print this usage message.
 Targets:
@@ -71,6 +76,7 @@
 else
 	use_subdirs=${MMAKE_USE_SUBDIRS=no}
 fi
+warn_undefined_vars=false
 
 while [ $# -gt 0 ]; do
 	case "$1" in
@@ -106,6 +112,14 @@
 			MMAKE="$MMAKE $1"
 			shift
 			;;
+		-w|--warn-undefined-vars)
+			warn_undefined_vars=true
+			shift
+			;;
+		-w-|--no-warn-undefined-vars)
+			warn_undefined_vars=false
+			shift
+			;;
 		--)	
 			MMAKE="$MMAKE $1"
 			shift
@@ -191,7 +205,10 @@
 		MMAKE_MAKE_OPTS=""
 		;;
 	*)
-		MMAKE_MAKE_OPTS="--warn-undefined-variables"
+		case $warn_undefined_vars in)
+			true)	MMAKE_MAKE_OPTS="--warn-undefined-variables" ;;
+			false)	MMAKE_MAKE_OPTS="" ;;
+		esac
 		;;
 esac
 

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3        |     -- the last words of T. S. Garp.