Hi Andrii and Yonghong,
I'm playing around with enum CO-RE relocations, and hit the following snag:
enum e { TWO };
bpf_core_enum_value_exists(enum e, TWO);
Compiling this with clang-12
(12.0.0-++20210225092616+e0e6b1e39e7e-1~exp1~20210225083321.50) gives
me the following:
internal/btf/testdata/relocs.c:66:2: error:
__builtin_preserve_enum_value argument 1 invalid
enum_value_exists(enum e, TWO);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
internal/btf/testdata/relocs.c:53:8: note: expanded from macro
'enum_value_exists'
if (!bpf_core_enum_value_exists(t, v)) { \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
internal/btf/testdata/bpf_core_read.h:168:32: note: expanded from
macro 'bpf_core_enum_value_exists'
__builtin_preserve_enum_value(*(typeof(enum_type)
*)enum_value, BPF_ENUMVAL_EXISTS)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Changing the definition of the enum to
enum e { TWO = 1 }
compiles successfully. I get the same result for any enum value that
is zero. Is this expected?
Best
Lorenz
--
Lorenz Bauer | Systems Engineer
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