[PATCH] gas: Avoid section symbols as group signatures

[Kirill A. Korinsky]

On Mon, 27 Jul 2026 13:04:47 +0200,
"Kirill A. Korinsky" <kirill@korins.ky> wrote:
> 
> When a COMDAT group signature matches its section name,
> symbol_find_exact finds the existing section symbol. GAS then reuses
> this unnamed STT_SECTION symbol as the group signature, although the
> signature requires a distinct named symbol.
> 
> Reject section symbols when selecting an existing signature; GAS then
> creates the usual named local STT_NOTYPE symbol.
> 
> This issue was discovered during the OpenBSD/sparc64 LLVM toolchain port
> and the attempt to upstream its LLVM changes:
> https://github.com/llvm/llvm-project/pull/207609
> 
> An LLD workaround for these objects was rejected upstream:
> https://github.com/llvm/llvm-project/pull/209841
> 
> The LLD workaround was tested while building GCC 15.2.0 and GCC 16.1.0
> on OpenBSD/sparc64 with the LLVM toolchain.
> ---
>  gas/config/obj-elf.c           | 1 +
>  gas/testsuite/gas/elf/elf.exp  | 1 +
>  gas/testsuite/gas/elf/group2.d | 8 ++++++++
>  gas/testsuite/gas/elf/group2.s | 2 ++
>  4 files changed, 12 insertions(+)
>  create mode 100644 gas/testsuite/gas/elf/group2.d
>  create mode 100644 gas/testsuite/gas/elf/group2.s
> 

I'd like to withdraw this patch because future tests proofs that it is not
complete and still needs some LLD side workaround, or future work in GAS

-- 
wbr, Kirill