[PATCH v2 0/3] RISC-V: Disable DWARF5 with known broken LLVM versions

From: Nathan Chancellor <nathan@kernel.org>
To: paul.walmsley@sifive.com, palmer@dabbelt.com,
	aou@eecs.berkeley.edu,  conor@kernel.org
Cc: maskray@google.com, ndesaulniers@google.com,
	 linux-riscv@lists.infradead.org, llvm@lists.linux.dev,
	 patches@lists.linux.dev, Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH v2 0/3] RISC-V: Disable DWARF5 with known broken LLVM versions
Date: Tue, 05 Dec 2023 16:53:49 -0700	[thread overview]
Message-ID: <20231205-riscv-restrict-dwarf5-llvm-v2-0-aedf00a382ac@kernel.org> (raw)

Hi all,

This series disables DWARF5 for LLVM versions where it is known to be
broken due to linker relaxation:

https://github.com/llvm/llvm-project/commit/bbc0f99f3bc96f1db16f649fc21dd18e5b0918f6

If I understand correctly, it sounds like GNU binutils has a similar
issue but I am not sure of the status of the fixes and such, so I did
not bother with checking for it but it should be easy to add if so
desired.

---
Changes in v2:
- Added patch 3 with Fangrui's suggested improvements around
  CONFIG_AS_HAS_NON_CONST_LEB128.
- Pick up Fangrui's Reviewed-by on patch 1.
- Link to v1: https://lore.kernel.org/r/20231129-riscv-restrict-dwarf5-llvm-v1-0-ec0d368fb538@kernel.org

---
Nathan Chancellor (3):
      riscv: Hoist linker relaxation disabling logic into Kconfig
      riscv: Restrict DWARF5 when building with LLVM to known working versions
      lib/Kconfig.debug: Update AS_HAS_NON_CONST_LEB128 comment and name

 arch/riscv/Kconfig  | 14 ++++++++++++++
 arch/riscv/Makefile |  4 +---
 lib/Kconfig.debug   | 12 +++++++-----
 3 files changed, 22 insertions(+), 8 deletions(-)
---
base-commit: 2cc14f52aeb78ce3f29677c2de1f06c0e91471ab
change-id: 20231129-riscv-restrict-dwarf5-llvm-a9824bb974cb

Best regards,
-- 
Nathan Chancellor <nathan@kernel.org>