[Bug target/106773] libbpf: failed to find BTF info for global/extern symbol 'bpf_link_fops'
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Dec 14 18:25:57 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106773
--- Comment #18 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by David Faust <dfaust@gcc.gnu.org>:
https://gcc.gnu.org/g:4f7aa145b796c044526c93f390e68f3b56a1b30a
commit r13-4708-g4f7aa145b796c044526c93f390e68f3b56a1b30a
Author: David Faust <david.faust@oracle.com>
Date: Wed Dec 7 11:47:26 2022 -0800
btf: fix 'extern const void' variables [PR106773]
The eBPF loader expects to find BTF_KIND_VAR records for references to
extern const void symbols. We were mistakenly identifing these as
unsupported types, and as a result skipping emitting VAR records for
them.
In addition, the internal DWARF representation from which BTF is
produced does not generate 'const' modifier DIEs for the void type,
which meant in BTF the 'const' qualifier was dropped for 'extern const
void' variables. This patch also adds support for generating a const
void type in BTF to correct emission for these variables.
PR target/106773
gcc/
* btfout.cc (btf_collect_datasec): Correct size of void entries.
(btf_dvd_emit_preprocess_cb): Do not skip emitting variables which
refer to void types.
(btf_init_postprocess): Create 'const void' type record if needed
and
adjust variables to refer to it as appropriate.
gcc/testsuite/
* gcc.dg/debug/btf/btf-pr106773.c: New test.
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