Makefile: move HAVE_MNL check to top-level Makefile

dcb, devlink, rdma, tipc and vdpa rely on libmnl to compile, so they
check for libmnl to be installed on their Makefiles.

This moves HAVE_MNL check from the tools to top-level Makefile, thus
avoiding to call their Makefiles if libmnl is not present.

Signed-off-by: Andrea Claudi <aclaudi@redhat.com>
Signed-off-by: David Ahern <dsahern@kernel.org>

Makefile

@@ -65,7 +65,10 @@ WFLAGS += -Wmissing-declarations -Wold-style-definition -Wformat=2
 CFLAGS := $(WFLAGS) $(CCOPTS) -I../include -I../include/uapi $(DEFINES) $(CFLAGS)
 YACCFLAGS = -d -t -v
 
-SUBDIRS=lib ip tc bridge misc netem genl tipc devlink rdma dcb man vdpa
+SUBDIRS=lib ip tc bridge misc netem genl man
+ifeq ($(HAVE_MNL),y)
+SUBDIRS += tipc devlink rdma dcb vdpa
+endif
 
 LIBNETLINK=../lib/libutil.a ../lib/libnetlink.a
 LDLIBS += $(LIBNETLINK)

dcb/Makefile

@@ -1,10 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 include ../config.mk
 
-TARGETS :=
-
-ifeq ($(HAVE_MNL),y)
-
 DCBOBJ = dcb.o \
          dcb_app.o \
          dcb_buffer.o \
@@ -15,8 +11,6 @@ DCBOBJ = dcb.o \
 TARGETS += dcb
 LDLIBS += -lm
 
-endif
-
 all: $(TARGETS) $(LIBS)
 
 dcb: $(DCBOBJ) $(LIBNETLINK)

devlink/Makefile

@@ -1,16 +1,10 @@
 # SPDX-License-Identifier: GPL-2.0
 include ../config.mk
 
-TARGETS :=
-
-ifeq ($(HAVE_MNL),y)
-
 DEVLINKOBJ = devlink.o mnlg.o
 TARGETS += devlink
 LDLIBS += -lm
 
-endif
-
 all: $(TARGETS) $(LIBS)
 
 devlink: $(DEVLINKOBJ) $(LIBNETLINK)

rdma/Makefile

@@ -1,16 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
 include ../config.mk
 
-TARGETS :=
-
-ifeq ($(HAVE_MNL),y)
 CFLAGS += -I./include/uapi/
 
 RDMA_OBJ = rdma.o utils.o dev.o link.o res.o res-pd.o res-mr.o res-cq.o \
 	   res-cmid.o res-qp.o sys.o stat.o stat-mr.o res-ctx.o res-srq.o
 
 TARGETS += rdma
-endif
 
 all:	$(TARGETS) $(LIBS)
 

tipc/Makefile

@@ -1,10 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 include ../config.mk
 
-TARGETS :=
-
-ifeq ($(HAVE_MNL),y)
-
 TIPCOBJ=bearer.o \
     cmdl.o link.o \
     media.o misc.o \
@@ -14,8 +10,6 @@ TIPCOBJ=bearer.o \
 
 TARGETS += tipc
 
-endif
-
 all: $(TARGETS) $(LIBS)
 
 tipc: $(TIPCOBJ)

vdpa/Makefile

@@ -1,16 +1,10 @@
 # SPDX-License-Identifier: GPL-2.0
 include ../config.mk
 
-TARGETS :=
-
-ifeq ($(HAVE_MNL),y)
-
 CFLAGS += -I./include/uapi/
 VDPAOBJ = vdpa.o
 TARGETS += vdpa
 
-endif
-
 all: $(TARGETS) $(LIBS)
 
 vdpa: $(VDPAOBJ)