samples/bpf: Fix HDR_PROBE "echo"

[linux-2.6-block.git] / samples / bpf / Makefile

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 1d9be26b4edd79b2ad0f4661411790d9e71d45dd..4f61725b1d86610db147c64d65104727ff11a090 100644 (file)
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -201,7 +201,7 @@ endif
 
 # Don't evaluate probes and warnings if we need to run make recursively
 ifneq ($(src),)
-HDR_PROBE := $(shell echo "\#include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \
+HDR_PROBE := $(shell printf "\#include <linux/types.h>\n struct list_head { int a; }; int main() { return 0; }" | \
        $(HOSTCC) $(KBUILD_HOSTCFLAGS) -x c - -o /dev/null 2>/dev/null && \
        echo okay)
 
@@ -282,7 +282,7 @@ $(obj)/hbm_edt_kern.o: $(src)/hbm.h $(src)/hbm_kern.h
 $(obj)/%.o: $(src)/%.c
        @echo "  CLANG-bpf " $@
        $(Q)$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) -I$(obj) \
-               -I$(srctree)/tools/testing/selftests/bpf/ \
+               -I$(srctree)/tools/testing/selftests/bpf/ -I$(srctree)/tools/lib/bpf/ \
                -D__KERNEL__ -D__BPF_TRACING__ -Wno-unused-value -Wno-pointer-sign \
                -D__TARGET_ARCH_$(SRCARCH) -Wno-compare-distinct-pointer-types \
                -Wno-gnu-variable-sized-type-not-at-end \