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Subject: [Bug debug/106263] BTF_KIND_FUNC type does not encode linkage
Date: Mon, 01 Aug 2022 17:46:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106263

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jose E. Marchesi <jemarch@gcc.gnu.org=
>:

https://gcc.gnu.org/g:32566720f3a9135fa355f0304f024a79f107a1b8

commit r13-1918-g32566720f3a9135fa355f0304f024a79f107a1b8
Author: Jose E. Marchesi <jose.marchesi@oracle.com>
Date:   Fri Jul 8 18:32:02 2022 +0200

    btf: emit linkage information in BTF_KIND_FUNC entries

    The kernel bpftool expects BTF_KIND_FUNC entries in BTF to include an
    annotation reflecting the linkage of functions (static, global).  For
    whatever reason they abuse the `vlen' field of the BTF_KIND_FUNC entry
    instead of adding a variable-part to the record like it is done with
    other entry kinds.

    This patch makes GCC to include this linkage info in BTF_KIND_FUNC
    entries.

    Tested in bpf-unknown-none target.

    gcc/ChangeLog:

            PR debug/106263
            * ctfc.h (struct ctf_dtdef): Add field linkage.
            * ctfc.cc (ctf_add_function): Set ctti_linkage.
            * dwarf2ctf.cc (gen_ctf_function_type): Pass a linkage for
            function types and subprograms.
            * btfout.cc (btf_asm_func_type): Emit linkage information for t=
he
            function.
            (btf_dtd_emit_preprocess_cb): Propagate the linkage information
            for functions.

    gcc/testsuite/ChangeLog:

            PR debug/106263
            * gcc.dg/debug/btf/btf-function-4.c: New test.
            * gcc.dg/debug/btf/btf-function-5.c: Likewise.=