libbpf: provide more helpful message on uninitialized global var

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When BPF program defines uninitialized global variable, it's put into
a special COMMON section. Libbpf will reject such programs, but will
provide very unhelpful message with garbage-looking section index.

This patch detects special section cases and gives more explicit error
message.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Andrii Nakryiko 2019-07-23 14:11:33 -07:00 • committed by Alexei Starovoitov

parent 3e3bb69589

commit f2a3e4e95f

1 changed files with 10 additions and 3 deletions

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tools/lib/bpf/libbpf.c

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