test/zdtm/lib/Makefile: fix

When optimizing our Travis runs, I noticed that test/zdtm/lib is built 3
times in a row -- first time the binaries, 2nd and 3rd time the deps,
in parallel (sic!).

I took a look at Makefile and found this, and some more problems,
like:

 - dependencies are generated but not included
 - cleandep does not depend on clean
 - groups.c dependencies are not generated (or used)
 - "make all" does not make groups binary
 - overcomplicated and unused groups.{pid,out,cleanout} targets
 - extra -f flag to rm
 - etc.

This patch (hopefully) fixes all of the above. In addition, it provides
a few enhancements:
 - enables "silent make" rules, so now lib/ is in line with the rest of zdtm
 - adds "dep" target (not used, just for convenience)
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

test/zdtm/lib/Makefile

+MAKEFLAGS	+= -r
+LIBDIR	:= .
 include ../Makefile.inc
 
-CFLAGS	= -g -O2 -Wall -Werror -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0
+CFLAGS	:= -g -O2 -Wall -Werror -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0
 CFLAGS	+= $(USERCFLAGS)
 
-LIBDIR	= .
-LIB	= libzdtmtst.a
-GRPS	= groups
+LIB	:= libzdtmtst.a
 
-LIBSRC	= datagen.c msg.c parseargs.c test.c streamutil.c lock.c ns.c tcp.c fs.c
-LIBOBJ	= $(LIBSRC:%.c=%.o)
-LIBDEP	= $(LIBSRC:%.c=%.d)
+LIBSRC	:= datagen.c msg.c parseargs.c test.c streamutil.c lock.c ns.c tcp.c fs.c
+LIBOBJ	:= $(LIBSRC:%.c=%.o)
 
-DEPEND.c = $(COMPILE.c) -MM -MP
-%.d:	%.c
-	$(DEPEND.c) $(OUTPUT_OPTION) $<
+BIN	:= groups
+SRC	:= $(LIBSRC) groups.c
+DEP	:= $(SRC:%.c=%.d)
+OBJ	:= $(SRC:%.c=%.o)
+LDLIBS	:= $(LIB)
 
-all:	$(LIB)
-	@true
-install: all
-.PHONY: all install
+TARGETS	:= $(LIB) $(BIN)
 
-$(LIB):	$(LIBOBJ)
-	$(Q) ar rv $@ $^
+all:	$(TARGETS)
+.PHONY: all
 
-clean:
-	$(RM) -f $(LIBOBJ) $(LIB) *~
+DEPEND.c = $(COMPILE.c) -MM -MP
+%.d:   %.c
+	$(E) " DEP      " $*.d
+	$(Q)$(DEPEND.c) $(OUTPUT_OPTION) $<
 
-cleandep:
-	$(RM) -f $(LIBDEP)
+%.o: %.c | %.d
+	$(E) " CC       " $@
+	$(Q)$(COMPILE.c) $(OUTPUT_OPTION) $<
 
-cleanout:
-	@true
+%: %.o $(LDLIBS)
+	$(E) " LINK     " $@
+	$(Q)$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@
 
-$(GRPS): $(LIB)
+$(LIB):	$(LIBOBJ)
+	$(E) " AR       " $@
+	$(Q)ar rcs $@ $^
+
+dep: $(DEP)
+.PHONY: dep
 
-$(GRPS:%=%.pid): $(GRPS)
-	$(<D)/$(<F) --pidfile=$@ --outfile=$<.out
+clean:
+	$(RM) $(OBJ) $(TARGETS)
 
-$(GRPS:%=%.out): $(GRPS:%=%.pid)
-	-kill -TERM `cat $<`
+cleandep: clean
+	$(RM) $(DEP)
 
-$(GRPS:%=%.cleanout): $(GRPS)
-	$(Q) $(RM) -f -r $<.pid $<.out* *$<.test* $<.*.test $<.state $<.init.pid
+cleanout: clean ;
 
 realclean:	clean cleandep
 
 .PHONY:	clean cleandep cleanout realclean
 
-ifeq ($(filter-out no-deps-targets, $(MAKECMDGOALS)),)
--include $(LIBDEP)
+no-deps-targets	:= clean cleandep cleanout realclean
+
+ifeq ($(filter $(no-deps-targets), $(MAKECMDGOALS)),)
+-include $(DEP)
 endif