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libbpf: add libelf dependency to shared library build

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The DPDK project is moving forward with its AF_XDP PMD, and during
that process some libbpf issues surfaced [1]: When libbpf was built
as a shared library, libelf was not included in the linking phase.
Since libelf is an internal depedency to libbpf, libelf should be
included. This patch adds '-lelf' to resolve that.

  [1] https://patches.dpdk.org/patch/50704/#93571

Fixes: 1b76c13e4b ("bpf tools: Introduce 'bpf' library and add bpf feature check")
Suggested-by: Luca Boccassi <bluca@debian.org>
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Björn Töpel 2019-03-27 14:51:14 +01:00 committed by Daniel Borkmann
parent 379e2014c9
commit 89dedaef49
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/Makefile
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@ -177,7 +177,7 @@ $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
$(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
$(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \
-Wl,--version-script=$(VERSION_SCRIPT) $^ -o $@
-Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
@ln -sf $(@F) $(OUTPUT)libbpf.so
@ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)