10804 Enable unused warnings outside of uts
Reviewed by: Andy Stormont <astormont@racktopsystems.com>
Reviewed by: Toomas Soome <tsoome@me.com>

@@ -19,11 +19,11 @@
 # CDDL HEADER END
 #
 #
 # Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
 # Copyright 2015 RackTop Systems.
-# Copyright (c) 2018, Joyent, Inc.
+# Copyright 2019, Joyent, Inc.
 #
 
 .KEEP_STATE:
 
 SRCS += fmd.c \

@@ -119,12 +119,13 @@
 CFLAGS += $(CTF_FLAGS) $(CCVERBOSE) $(XSTRCONST)
 LINTFLAGS += -mu
 CERRWARN += -_gcc=-Wno-switch
 CERRWARN += -_gcc=-Wno-parentheses
 CERRWARN += -_gcc=-Wno-uninitialized
-CERRWARN += -_gcc=-Wno-unused-variable
 CERRWARN += -_gcc=-Wno-clobbered
+$(RELEASE_BUILD)CERRWARN += -_gcc=-Wno-unused-but-set-variable
+CERRWARN += -_gcc=-Wno-unused-variable
 
 # not linted
 SMATCH=off
 
 $(PROG) := LDFLAGS += -R/usr/lib/fm