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libbpf: Don't use cxx to test_libpf target 

No need to use C++ for test_libbpf target when libbpf is on C and it
can be tested with C, after this change the CXXFLAGS in makefiles can
be avoided, at least in bpf samples, when sysroot is used, passing
same C/LDFLAGS as for lib.

Add "return 0" in test_libbpf to avoid warn, but also remove spaces at
start of the lines to keep same style and avoid warns while apply.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20191011002808.28206-12-ivan.khoronzhuk@linaro.org
This commit is contained in:
Ivan Khoronzhuk 2019-10-11 03:28:04 +03:00 committed by Alexei Starovoitov
parent a833effa15
commit 5c26f9a783
2 changed files with 13 additions and 19 deletions
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18
tools/lib/bpf/Makefile
View File

@ -52,7 +52,7 @@ ifndef VERBOSE
endif
FEATURE_USER = .libbpf
FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx
FEATURE_TESTS = libelf libelf-mmap bpf reallocarray
FEATURE_DISPLAY = libelf bpf
INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi
@ -142,15 +142,7 @@ GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \
VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \
grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
CMD_TARGETS = $(LIB_TARGET) $(PC_FILE)
CXX_TEST_TARGET = $(OUTPUT)test_libbpf
ifeq ($(feature-cxx), 1)
CMD_TARGETS += $(CXX_TEST_TARGET)
endif
TARGETS = $(CMD_TARGETS)
CMD_TARGETS = $(LIB_TARGET) $(PC_FILE) $(OUTPUT)test_libbpf
all: fixdep
$(Q)$(MAKE) all_cmd
@ -190,8 +182,8 @@ $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
$(OUTPUT)libbpf.a: $(BPF_IN)
$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a
$(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@
$(OUTPUT)test_libbpf: test_libbpf.c $(OUTPUT)libbpf.a
$(QUIET_LINK)$(CC) $(INCLUDES) $^ -lelf -o $@
$(OUTPUT)libbpf.pc:
$(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
@ -266,7 +258,7 @@ config-clean:
$(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null
clean:
$(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
$(call QUIET_CLEAN, libbpf) $(RM) $(CMD_TARGETS) \
*.o *~ *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) .*.d .*.cmd \
*.pc LIBBPF-CFLAGS bpf_helper_defs.h
$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf

14
tools/lib/bpf/test_libbpf.cpp → tools/lib/bpf/test_libbpf.c
View File

@ -7,12 +7,14 @@
int main(int argc, char *argv[])
{
/* libbpf.h */
libbpf_set_print(NULL);
/* libbpf.h */
libbpf_set_print(NULL);
/* bpf.h */
bpf_prog_get_fd_by_id(0);
/* bpf.h */
bpf_prog_get_fd_by_id(0);
/* btf.h */
btf__new(NULL, 0);
/* btf.h */
btf__new(NULL, 0);
return 0;
}