[Bug find-debuginfo/33827] Add find-debuginfo --check-elf flag to run eu-elflint

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=33827

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Add find-debugedit          |Add find-debuginfo
                   |--check-elf flag to run     |--check-elf flag to run
                   |eu-elflint                  |eu-elflint
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
Pushed:

commit 39d89b44ca1746117ae537c5a6ea9f91e0d66f71
Author: Mark Wielaard <mark@klomp.org>
Date:   Fri Jan 23 18:58:44 2026 +0100

    find-debuginfo: Add --check-elf[-strict] to invoke eu-elflint

    To make sure the ELF and AR file processed by and created by
    find-debuginfo are valid introduce a --check-elf[-strict] option. The
    --check-elf and --check-elf-strict flags will run eu-elflint --gnu on
    the ELF and AR files before and after processing the files. Including
    on the generated separate .debug files. When --check-elf-strict is
    given then if eu-elflint reports any errors find-debuginfo will exit
    with a failure status. With just --check-elf given any eu-elflint
    output will be logged but not change the exit status.

    Add a couple of testcases using --check-elf-strict including minidata,
    gdb index, dwz creation and an AR file.

            * configure.ac: Add check for eu-elflint.
            * scripts/find-debuginfo.in: Add new flags in usage and help.
            (check_elf, check_elf_strict, elflint_opts, check_elf_msg):
            New vars. Process --check-elf, --check-elf-struct opts.
            (do_check_elf): New function.
            (do_ar_file): Call do_check_elf before/after AR file processing.
            Propagate return value to caller.
            (do_file): Check and propagate return value for
            do_ar_file. Call do_check_elf before and after processing ELF
            file. Also check debug file.
            * tests/find-debuginfo.at (FIND_DEBUGINFO_PKG_BUILD_SETUP):
            Create .o object files.
            Add tests for --check-elf-strict plus debugdata, gdb-index and
            dwz. Create ar file from object files and check.

    https://sourceware.org/bugzilla/show_bug.cgi?id=33827

There have been several updates to eu-elflint in elfutils upstream (but no
release yet). Still not "perfect" on clang/llvm/lld, but the most common issues
have been resolved using lld however still show some false (?) positives. Using
--check-elf-strict does catch the riscv issue (before bug #33827 was fixed).

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