libbpf: Fix VERSIONED_SYM_COUNT number parsing

[ Upstream commit 1fd6cee127e2ddff36d648573d7566aafb0d0b77 ]

We remove "other info" from "readelf -s --wide" output when
parsing GLOBAL_SYM_COUNT variable, which was added in [1].
But we don't do that for VERSIONED_SYM_COUNT and it's failing
the check_abi target on powerpc Fedora 33.

The extra "other info" wasn't problem for VERSIONED_SYM_COUNT
parsing until commit [2] added awk in the pipe, which assumes
that the last column is symbol, but it can be "other info".

Adding "other info" removal for VERSIONED_SYM_COUNT the same
way as we did for GLOBAL_SYM_COUNT parsing.

[1] aa915931ac3e ("libbpf: Fix readelf output parsing for Fedora")
[2] 746f534a4809 ("tools/libbpf: Avoid counting local symbols in ABI check")

Fixes: 746f534a4809 ("tools/libbpf: Avoid counting local symbols in ABI check")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20201118211350.1493421-1-jolsa@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 9ae8f4ef0aac27ad88a323c5a3098f880aa806b3..8bf2c406b0e05e31401d483b3886ab8746bc193e 100644 (file)
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -152,6 +152,7 @@ GLOBAL_SYM_COUNT = $(shell readelf -s --wide $(BPF_IN_SHARED) | \
                           awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \
                           sort -u | wc -l)
 VERSIONED_SYM_COUNT = $(shell readelf --dyn-syms --wide $(OUTPUT)libbpf.so | \
+                             sed 's/\[.*\]//' | \
                              awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}' | \
                              grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 | sort -u | wc -l)
 
@@ -220,6 +221,7 @@ check_abi: $(OUTPUT)libbpf.so
                    awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'|  \
                    sort -u > $(OUTPUT)libbpf_global_syms.tmp;           \
                readelf --dyn-syms --wide $(OUTPUT)libbpf.so |           \
+                   sed 's/\[.*\]//' |                                   \
                    awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$NF}'|  \
                    grep -Eo '[^ ]+@LIBBPF_' | cut -d@ -f1 |             \
                    sort -u > $(OUTPUT)libbpf_versioned_syms.tmp;        \