diff options
Diffstat (limited to 'tools/lib/bpf/Makefile')
| -rw-r--r-- | tools/lib/bpf/Makefile | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile index 425b480bda75..34d9c3619c96 100644 --- a/tools/lib/bpf/Makefile +++ b/tools/lib/bpf/Makefile @@ -66,7 +66,7 @@ ifndef VERBOSE endif FEATURE_USER = .libbpf -FEATURE_TESTS = libelf libelf-mmap bpf reallocarray +FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx FEATURE_DISPLAY = libelf bpf INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi @@ -145,14 +145,26 @@ include $(srctree)/tools/build/Makefile.include BPF_IN := $(OUTPUT)libbpf-in.o LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) +VERSION_SCRIPT := libbpf.map + +GLOBAL_SYM_COUNT = $(shell readelf -s $(BPF_IN) | \ + awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print s}') +VERSIONED_SYM_COUNT = $(shell readelf -s $(OUTPUT)libbpf.so | \ + grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l) CMD_TARGETS = $(LIB_FILE) +CXX_TEST_TARGET = $(OUTPUT)test_libbpf + +ifeq ($(feature-cxx), 1) + CMD_TARGETS += $(CXX_TEST_TARGET) +endif + TARGETS = $(CMD_TARGETS) all: fixdep all_cmd -all_cmd: $(CMD_TARGETS) +all_cmd: $(CMD_TARGETS) check $(BPF_IN): force elfdep bpfdep @(test -f ../../include/uapi/linux/bpf.h -a -f ../../../include/uapi/linux/bpf.h && ( \ @@ -170,11 +182,27 @@ $(BPF_IN): force elfdep bpfdep $(Q)$(MAKE) $(build)=libbpf $(OUTPUT)libbpf.so: $(BPF_IN) - $(QUIET_LINK)$(CC) --shared $^ -o $@ + $(QUIET_LINK)$(CC) --shared -Wl,--version-script=$(VERSION_SCRIPT) \ + $^ -o $@ $(OUTPUT)libbpf.a: $(BPF_IN) $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ +$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a + $(QUIET_LINK)$(CXX) $^ -lelf -o $@ + +check: check_abi + +check_abi: $(OUTPUT)libbpf.so + @if [ "$(GLOBAL_SYM_COUNT)" != "$(VERSIONED_SYM_COUNT)" ]; then \ + echo "Warning: Num of global symbols in $(BPF_IN)" \ + "($(GLOBAL_SYM_COUNT)) does NOT match with num of" \ + "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \ + "Please make sure all LIBBPF_API symbols are" \ + "versioned in $(VERSION_SCRIPT)." >&2; \ + exit 1; \ + fi + define do_install if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ @@ -201,8 +229,8 @@ config-clean: $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null clean: - $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so .*.d .*.cmd \ - $(RM) LIBBPF-CFLAGS + $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \ + *.o *~ *.a *.so .*.d .*.cmd LIBBPF-CFLAGS $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf |