[RFC PATCH 02/13] tools: Add ubpf feature test

[Wang Nan]

Add test-ubpf.c to find libubpf, which can be found from [1].

ubpf is user space BPF engine. Following commits will utilize ubpf
to make perf dynamically run some profiling scripts in user space.

[1] https://github.com/iovisor/ubpf.git

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Brendan Gregg <brendan.d.gregg@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>
---
 tools/build/Makefile.feature    |  6 ++++--
 tools/build/feature/Makefile    |  6 +++++-
 tools/build/feature/test-ubpf.c | 11 +++++++++++
 tools/lib/bpf/Makefile          |  4 ++--
 4 files changed, 22 insertions(+), 5 deletions(-)
 create mode 100644 tools/build/feature/test-ubpf.c

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 9f87861..eb84b6a 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -56,7 +56,8 @@ FEATURE_TESTS_BASIC :=			\
 	zlib				\
 	lzma				\
 	get_cpuid			\
-	bpf
+	bpf				\
+	ubpf
 
 # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
 # of all feature tests
@@ -96,7 +97,8 @@ FEATURE_DISPLAY ?=			\
 	zlib				\
 	lzma				\
 	get_cpuid			\
-	bpf
+	bpf				\
+	ubpf
 
 # Set FEATURE_CHECK_(C|LD)FLAGS-all for all FEATURE_TESTS features.
 # If in the future we need per-feature checks/flags for features not
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 4ae94db..7480e0f 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -37,7 +37,8 @@ FILES=					\
 	test-zlib.bin			\
 	test-lzma.bin			\
 	test-bpf.bin			\
-	test-get_cpuid.bin
+	test-get_cpuid.bin		\
+	test-ubpf.bin
 
 FILES := $(addprefix $(OUTPUT),$(FILES))
 
@@ -182,6 +183,9 @@ $(OUTPUT)test-get_cpuid.bin:
 $(OUTPUT)test-bpf.bin:
 	$(BUILD)
 
+$(OUTPUT)test-ubpf.bin:
+	$(BUILD) -lubpf
+
 -include $(OUTPUT)*.d
 
 ###############################
diff --git a/tools/build/feature/test-ubpf.c b/tools/build/feature/test-ubpf.c
new file mode 100644
index 0000000..3c0a257
--- /dev/null
+++ b/tools/build/feature/test-ubpf.c
@@ -0,0 +1,11 @@
+#include <stdlib.h>
+#include <ubpf.h>
+
+int main(void)
+{
+	struct ubpf_vm *vm;
+
+	vm = ubpf_create();
+	ubpf_destroy(vm);
+	return 0;
+}
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index fc1bc75..8dfa512 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -65,8 +65,8 @@ ifndef VERBOSE
 endif
 
 FEATURE_USER = .libbpf
-FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf
-FEATURE_DISPLAY = libelf bpf
+FEATURE_TESTS = libelf libelf-getphdrnum libelf-mmap bpf ubpf
+FEATURE_DISPLAY = libelf bpf ubpf
 
 INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/arch/$(ARCH)/include/uapi -I$(srctree)/include/uapi
 FEATURE_CHECK_CFLAGS-bpf = $(INCLUDES)
-- 
1.8.3.4