netdev - [PATCH bpf 2/2] libbpf: add libelf dependency to shared library build

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Message-Id: <20190327135114.17026-3-bjorn.topel@gmail.com>
Date:   Wed, 27 Mar 2019 14:51:14 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        magnus.karlsson@...el.com, bpf@...r.kernel.org,
        xiaolong.ye@...el.com, qi.z.zhang@...el.com
Subject: [PATCH bpf 2/2] libbpf: add libelf dependency to shared library build

From: Björn Töpel <bjorn.topel@...el.com>

When libbpf was built was a shared library, libelf was not included in
the linking phase. Since libelf is an internal depedency to libbpf,
libeld should be included. This patch adds '-lelf' to resolve that.

Fixes: 1b76c13e4b36 ("bpf tools: Introduce 'bpf' library and add bpf feature check")
Suggested-by: Luca Boccassi <bluca@...ian.org>
Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
---
 tools/lib/bpf/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 279589c29983..7beec4d5b522 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -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)
 
-- 
2.19.1