Libgloss build issue with GCC16 for arc target

[Yuriy Kolerov]

Hi Nik,

Please create a GitHub issue for this bug in this repository for Synopsys tools for ARC Classic:

https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain

I will take care of it. Most likely it's an issue with GCC or Binutils.

Regards,
Yuriy Kolerov

________________________________
From: Nik Spaun <spaun2002mobile@gmail.com>
Sent: Monday, May 4, 2026 21:58
To: newlib@sourceware.org <newlib@sourceware.org>
Subject: Libgloss build issue with GCC16 for arc target

Hello,

The crosstool-ng project is adding GCC16 support and has encountered an issue with the newlib build for the arc target (arc-multilib-elf32).
The problem is the generated assembly instructions:
GCC 16 can compile the hostlink buffer copy in _hl_pack_ptr into an ARC uncached byte store with a register-indexed address:

    stb.di r2,[r13,r1]

binutils rejects that instruction for ARC EM/HS targets, breaking the
arc-multilib-elf32 build while compiling libgloss/arc/hl/hl_api.c.

The attached patch fixes the issue, but I'm not sure if it's the best solution.

The failing crosstool-ng CI job is here https://github.com/crosstool-ng/crosstool-ng/actions/runs/25193796890/job/74152179593?pr=2502<https://urldefense.com/v3/__https://github.com/crosstool-ng/crosstool-ng/actions/runs/25193796890/job/74152179593?pr=2502__;!!A4F2R9G_pg!YMRMPmPzCSvAsZ3JtgNghDga_KqnIr3-zruGc9NC2Xq0ecGLsNEIgZcJPXRWmAzuxhadx5RKI93JvK9KxHI7iLokR-V3$>

WBR,
Nik
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