selftests/bpf: Test btf_dump rendering of decl_tags

Cover the decl tag rendering the libbpf patch added. One subtest
builds a BTF with every shape that renders, plus two that must not:

 - a named record with both forms of tag
 - a typedef'd anonymous record, whose attribute precedes the declarator
 - a union
 - a record that also carries the derived packed attribute
 - an anonymous record inlined at a member
 - two records whose tags are added in reverse target order, which is
   what pins the sort: without it the records lose their attributes
 - attributes on a var and on a func, which btf_dump never declares

The incremental subtest's second round adds an attribute to the new
struct, pinning the later-walk indexing of appended types.

A separate subtest covers members. A member attribute and a record one
share a key in the index, so it checks they do not leak into each
other's position, over a function pointer, an array and a bit-field -
declarators the attribute has to follow rather than precede.

Another covers typedefs, including a typedef of an anonymous record
carrying three groups at once, binding to the member, the record and
the typedef.

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://patch.msgid.link/20260929234608.48503-5-ihor.solodrai@linux.dev

0 files changed, 0 insertions, 0 deletions