[PATCH v3] gas: add --reloc-section-sym={all,internal,none} option for ELF

[Fangrui Song]

On Fri, Feb 27, 2026 at 10:19 PM Fangrui Song <i@maskray.me> wrote:
>
> From: Fangrui Song <maskray@sourceware.org>
>
> When generating relocations for non-ifunc local symbols that satisfies
> several conditions, GAS converts them to reference the section symbol
> (STT_SECTION) instead, folding the original symbol's offset into the
> addend.  This allows the original local symbol to be omitted from
> .symtab, but the STT_SECTION symbol itself must be present, so the
> conversion saves .symtab entries only when a section has more than one
> local symbol referenced by relocations.
>
> Add --reloc-section-sym to control this conversion:
>
> - all (default): convert all eligible local symbols
> - internal: only convert compiler-generated locals (.L prefix)
> - none: never convert; keep all symbols as-is in relocations
>
> This is useful for debugging and for tools that benefit from preserved
> symbol names.
>
> PR gas/33885
> ---
>  gas/NEWS                                      |  4 ++++
>  gas/as.c                                      | 20 +++++++++++++++-
>  gas/as.h                                      | 10 ++++++++
>  gas/doc/as.texi                               | 11 +++++++++
>  gas/testsuite/gas/elf/elf.exp                 |  9 +++++---
>  gas/testsuite/gas/elf/reloc-section-sym-all.d | 12 ++++++++++
>  .../gas/elf/reloc-section-sym-internal.d      | 12 ++++++++++
>  .../gas/elf/reloc-section-sym-none.d          | 12 ++++++++++
>  gas/testsuite/gas/elf/reloc-section-sym.s     |  9 ++++++++
>  .../gas/i386/reloc-section-sym-all.d          | 23 +++++++++++++++++++
>  .../gas/i386/reloc-section-sym-internal.d     | 23 +++++++++++++++++++
>  .../gas/i386/reloc-section-sym-none.d         | 23 +++++++++++++++++++
>  gas/testsuite/gas/i386/reloc-section-sym.s    | 14 +++++++++++
>  gas/testsuite/gas/i386/x86-64.exp             |  4 ++++
>  gas/write.c                                   |  8 +++++++
>  15 files changed, 190 insertions(+), 4 deletions(-)
>  create mode 100644 gas/testsuite/gas/elf/reloc-section-sym-all.d
>  create mode 100644 gas/testsuite/gas/elf/reloc-section-sym-internal.d
>  create mode 100644 gas/testsuite/gas/elf/reloc-section-sym-none.d
>  create mode 100644 gas/testsuite/gas/elf/reloc-section-sym.s
>  create mode 100644 gas/testsuite/gas/i386/reloc-section-sym-all.d
>  create mode 100644 gas/testsuite/gas/i386/reloc-section-sym-internal.d
>  create mode 100644 gas/testsuite/gas/i386/reloc-section-sym-none.d
>  create mode 100644 gas/testsuite/gas/i386/reloc-section-sym.s
>

Ping:)