[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>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106773

--- Comment #17 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:2bce22e88e1c8486a0f2d42311506a8d3da20fb7

commit r13-4707-g2bce22e88e1c8486a0f2d42311506a8d3da20fb7
Author: David Faust <david.faust@oracle.com>
Date:   Wed Dec 7 11:44:28 2022 -0800

    btf: add 'extern' linkage for variables [PR106773]

    Add support for the 'extern' linkage value for BTF_KIND_VAR records,
    which is used for variables declared as extern in the source file.

    This also fixes a bug with BTF generation for extern variables which
    have both a non-defining declaration and a defining declaration in the
    same CU.

            PR target/106773

    gcc/

            * btfout.cc (btf_collect_datasec): Mark extern variables as such.
            (btf_dvd_emit_preprocess_cb): Skip non-defining extern variable
decl
            if there is a defining decl for the same variable.
            (btf_asm_varent): Accomodate 'extern' linkage.

    gcc/testsuite/

            * gcc.dg/debug/btf/btf-variables-4.c: New test.
            * gcc.dg/debug/btf/btf-variables-5.c: New test.

    include/

            * btf.h (enum btf_var_linkage): New.
            (struct btf_var): Update comment to note 'extern' linkage.