linux-kernel - [PATCH 1/2] libbpf: add fPIC option for static library

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Date:   Sat, 24 Sep 2022 18:12:08 +0800
From:   Xin Liu <liuxin350@...wei.com>
To:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <martin.lau@...ux.dev>, <song@...nel.org>, <yhs@...com>,
        <john.fastabend@...il.com>, <kpsingh@...nel.org>, <sdf@...gle.com>,
        <haoluo@...gle.com>, <jolsa@...nel.org>
CC:     <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yanan@...wei.com>, <wuchangye@...wei.com>,
        <xiesongyang@...wei.com>, <zhudi2@...wei.com>,
        <kongweibin2@...wei.com>, <liuxin350@...wei.com>
Subject: [PATCH 1/2] libbpf: add fPIC option for static library

Some programs depned on libbpf.a(eg:bpftool). If libbpf.a miss -fPIC,
this will cause a similar error at compile time:

/usr/bin/ld: .../libbpf.a(libbpf-in.o): relocation
R_AARCH64_ADR_PREL_PG_HI21 against symbol `stderr@@GLIBC_2.17' which
may bind externally can not be used when making a sharedobject;
recompile with -fPIC

Use -fPIC for static library compilation to solve this problem.

Signed-off-by: Xin Liu <liuxin350@...wei.com>
---
 tools/lib/bpf/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 4c904ef0b47e..427e971f4fcd 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -91,9 +91,10 @@ override CFLAGS += $(INCLUDES)
 override CFLAGS += -fvisibility=hidden
 override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 override CFLAGS += $(CLANG_CROSS_FLAGS)
+override CFLAGS += -fPIC
 
 # flags specific for shared library
-SHLIB_FLAGS := -DSHARED -fPIC
+SHLIB_FLAGS := -DSHARED
 
 ifeq ($(VERBOSE),1)
   Q =
-- 
2.33.0