[PATCH v1] samples/bpf: Fix build out of source tree

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This commit fixes a few compilation issues when building out of source
tree. The command that I used to build samples/bpf:

export KBUILD_OUTPUT=/tmp
make V=1 M=samples/bpf

The compilation failed since it tried to find the header files in the
wrong places between output directory and source tree directory

Signed-off-by: Anh Tuan Phan <tuananhlfc@xxxxxxxxx>
---
 samples/bpf/Makefile        | 8 ++++----
 samples/bpf/Makefile.target | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 615f24ebc49c..32469aaa82d5 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -341,10 +341,10 @@ $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
 # Override includes for xdp_sample_user.o because $(srctree)/usr/include in
 # TPROGS_CFLAGS causes conflicts
 XDP_SAMPLE_CFLAGS += -Wall -O2 \
-		     -I$(src)/../../tools/include \
+		     -I$(srctree)/tools/include \
 		     -I$(src)/../../tools/include/uapi \
 		     -I$(LIBBPF_INCLUDE) \
-		     -I$(src)/../../tools/testing/selftests/bpf
+		     -I$(srctree)/tools/testing/selftests/bpf

 $(obj)/$(XDP_SAMPLE): TPROGS_CFLAGS = $(XDP_SAMPLE_CFLAGS)
 $(obj)/$(XDP_SAMPLE): $(src)/xdp_sample_user.h $(src)/xdp_sample_shared.h
@@ -393,7 +393,7 @@ $(obj)/xdp_router_ipv4.bpf.o: $(obj)/xdp_sample.bpf.o
 $(obj)/%.bpf.o: $(src)/%.bpf.c $(obj)/vmlinux.h $(src)/xdp_sample.bpf.h
$(src)/xdp_sample_shared.h
 	@echo "  CLANG-BPF " $@
 	$(Q)$(CLANG) -g -O2 -target bpf -D__TARGET_ARCH_$(SRCARCH) \
-		-Wno-compare-distinct-pointer-types -I$(srctree)/include \
+		-Wno-compare-distinct-pointer-types -I$(obj) -I$(srctree)/include \
 		-I$(srctree)/samples/bpf -I$(srctree)/tools/include \
 		-I$(LIBBPF_INCLUDE) $(CLANG_SYS_INCLUDES) \
 		-c $(filter %.bpf.c,$^) -o $@
@@ -412,7 +412,7 @@ xdp_router_ipv4.skel.h-deps := xdp_router_ipv4.bpf.o
xdp_sample.bpf.o

 LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.bpf.c,$(foreach
skel,$(LINKED_SKELS),$($(skel)-deps)))

-BPF_SRCS_LINKED := $(notdir $(wildcard $(src)/*.bpf.c))
+BPF_SRCS_LINKED := $(notdir $(wildcard $(srctree)/$(src)/*.bpf.c))
 BPF_OBJS_LINKED := $(patsubst %.bpf.c,$(obj)/%.bpf.o, $(BPF_SRCS_LINKED))
 BPF_SKELS_LINKED := $(addprefix $(obj)/,$(LINKED_SKELS))

diff --git a/samples/bpf/Makefile.target b/samples/bpf/Makefile.target
index 7621f55e2947..86a454cfb080 100644
--- a/samples/bpf/Makefile.target
+++ b/samples/bpf/Makefile.target
@@ -41,7 +41,7 @@ _tprogc_flags   = $(TPROGS_CFLAGS) \
                  $(TPROGCFLAGS_$(basetarget).o)

 # $(objtree)/$(obj) for including generated headers from checkin source
files
-ifeq ($(KBUILD_EXTMOD),)
+ifneq ($(KBUILD_EXTMOD),)
 ifdef building_out_of_srctree
 _tprogc_flags   += -I $(objtree)/$(obj)
 endif
-- 
2.34.1




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