On 03/23, Daniel Borkmann wrote:
> Even though libbpf's versioning script for the linker (libbpf.map)
> is pointing to 0.0.2, the BPF_EXTRAVERSION in the Makefile has
> not been updated along with it and is therefore still on 0.0.1.
>
> While fixing up, I also noticed that the generated shared object
> versioning information is missing, typical convention is to have
> a linker name (libbpf.so), soname (libbpf.so.0) and real name
> (libbpf.so.0.0.2) for library management. This is based upon the
> LIBBPF_VERSION as well.
>
> The build will then produce the following bpf libraries:
Thank you for taking care of this! Couple of nits/questions below.
>
> # ll libbpf*
> libbpf.a
> libbpf.so -> libbpf.so.0.0.2
> libbpf.so.0 -> libbpf.so.0.0.2
> libbpf.so.0.0.2
>
> And the they are also properly installed:
>
> # rm -rf /tmp/bld; mkdir /tmp/bld; make -j$(nproc) O=/tmp/bld install
>
> Auto-detecting system features:
> ... libelf: [ on ]
> ... bpf: [ on ]
>
> CC /tmp/bld/libbpf.o
> CC /tmp/bld/bpf.o
> CC /tmp/bld/nlattr.o
> CC /tmp/bld/btf.o
> CC /tmp/bld/libbpf_errno.o
> CC /tmp/bld/str_error.o
> CC /tmp/bld/netlink.o
> CC /tmp/bld/bpf_prog_linfo.o
> CC /tmp/bld/libbpf_probes.o
> CC /tmp/bld/xsk.o
> LD /tmp/bld/libbpf-in.o
> LINK /tmp/bld/libbpf.a
> LINK /tmp/bld/libbpf.so.0.0.2
> LINK /tmp/bld/test_libbpf
> INSTALL /tmp/bld/libbpf.a
> INSTALL /tmp/bld/libbpf.so.0.0.2
>
> # ll /usr/local/lib64/libbpf.*
> /usr/local/lib64/libbpf.a
> /usr/local/lib64/libbpf.so -> libbpf.so.0.0.2
> /usr/local/lib64/libbpf.so.0 -> libbpf.so.0.0.2
> /usr/local/lib64/libbpf.so.0.0.2
>
> Fixes: 1bf4b05810fe ("tools: bpftool: add probes for eBPF program types")
> Fixes: 1b76c13e4b36 ("bpf tools: Introduce 'bpf' library and add bpf feature
> check")
> Reported-by: Stanislav Fomichev <s...@google.com>
> Signed-off-by: Daniel Borkmann <dan...@iogearbox.net>
> ---
> tools/lib/bpf/Makefile | 42 ++++++++++++++++++++++++++++--------------
> 1 file changed, 28 insertions(+), 14 deletions(-)
>
> diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> index 61aaacf..ada2e90a9 100644
> --- a/tools/lib/bpf/Makefile
> +++ b/tools/lib/bpf/Makefile
> @@ -3,7 +3,7 @@
>
> BPF_VERSION = 0
> BPF_PATCHLEVEL = 0
> -BPF_EXTRAVERSION = 1
> +BPF_EXTRAVERSION = 2
>
> MAKEFLAGS += --no-print-directory
>
> @@ -79,8 +79,6 @@ export prefix libdir src obj
> libdir_SQ = $(subst ','\'',$(libdir))
> libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
>
> -LIB_FILE = libbpf.a libbpf.so
> -
> VERSION = $(BPF_VERSION)
> PATCHLEVEL = $(BPF_PATCHLEVEL)
> EXTRAVERSION = $(BPF_EXTRAVERSION)
> @@ -88,7 +86,10 @@ EXTRAVERSION = $(BPF_EXTRAVERSION)
> OBJ = $@
> N =
>
> -LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
> +LIBBPF_VERSION = $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
> +
> +LIB_TARGET = libbpf.a libbpf.so.$(LIBBPF_VERSION)
> +LIB_FILE = libbpf.a libbpf.so*
>
> # Set compile option CFLAGS
> ifdef EXTRA_CFLAGS
> @@ -128,16 +129,18 @@ all:
> export srctree OUTPUT CC LD CFLAGS V
> include $(srctree)/tools/build/Makefile.include
>
> -BPF_IN := $(OUTPUT)libbpf-in.o
> -LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
> -VERSION_SCRIPT := libbpf.map
> +BPF_IN := $(OUTPUT)libbpf-in.o
> +VERSION_SCRIPT := libbpf.map
> +
> +LIB_TARGET := $(addprefix $(OUTPUT),$(LIB_TARGET))
> +LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE))
>
> GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN) | \
> awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {s++} END{print
> s}')
> VERSIONED_SYM_COUNT = $(shell readelf -s --wide $(OUTPUT)libbpf.so | \
> grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u
> | wc -l)
>
> -CMD_TARGETS = $(LIB_FILE)
> +CMD_TARGETS = $(LIB_TARGET)
>
> CXX_TEST_TARGET = $(OUTPUT)test_libbpf
>
> @@ -170,9 +173,13 @@ $(BPF_IN): force elfdep bpfdep
> echo "Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h'
> differs from latest version at 'include/uapi/linux/if_xdp.h'" >&2 )) || true
> $(Q)$(MAKE) $(build)=libbpf
>
> -$(OUTPUT)libbpf.so: $(BPF_IN)
> - $(QUIET_LINK)$(CC) --shared -Wl,--version-script=$(VERSION_SCRIPT) \
> - $^ -o $@
> +$(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
> +
> +$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
> + $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(LIBBPF_VERSION) \
Shouldn't it be -soname,libbpf.so.$(VERSION) ?
> + -Wl,--version-script=$(VERSION_SCRIPT) $^
> -o $@
> + @ln -sf $(@F) $(OUTPUT)libbpf.so
> + @ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)
>
> $(OUTPUT)libbpf.a: $(BPF_IN)
> $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
> @@ -192,6 +199,12 @@ check_abi: $(OUTPUT)libbpf.so
> exit 1; \
> fi
>
> +define do_install_mkdir
> + if [ ! -d '$(DESTDIR_SQ)$1' ]; then \
> + $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
> + fi
> +endef
> +
> define do_install
> if [ ! -d '$(DESTDIR_SQ)$2' ]; then \
> $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
> @@ -200,8 +213,9 @@ define do_install
> endef
>
> install_lib: all_cmd
> - $(call QUIET_INSTALL, $(LIB_FILE)) \
> - $(call do_install,$(LIB_FILE),$(libdir_SQ))
> + $(call QUIET_INSTALL, $(LIB_TARGET)) \
> + $(call do_install_mkdir,$(libdir_SQ)); \
> + cp -fpR $(LIB_FILE) $(DESTDIR)$(libdir_SQ)
>
> install_headers:
> $(call QUIET_INSTALL, headers) \
> @@ -219,7 +233,7 @@ config-clean:
>
> clean:
> $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
> - *.o *~ *.a *.so .*.d .*.cmd LIBBPF-CFLAGS
> + *.o *~ *.a *.so *.so.$(VERSION) .*.d .*.cmd LIBBPF-CFLAGS
What about libbpf.so.$(LIBBPF_VERSION) ?
> $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
>
>
> --
> 2.9.5
>
