[PATCH] D110580: [THUMB2] default .text alignment to 2B

[Nick Desaulniers via Phabricator via llvm-commits]

nickdesaulniers created this revision.
nickdesaulniers added reviewers: peter.smith, rengolin, MaskRay.
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Similar to GAS, default the alignment of .text to 2B. This difference
between clang vs GAS was frustrating efforts to debug pr/51929.

Similar to D102052 <https://reviews.llvm.org/D102052>.

Does not regress Linux kernel boots in QEMU. Tested with Linux kernel
tag v5.15-rc3 with
https://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=9122/1
applied, and QEMU tag v5.2.0. In pr/51929 we're working to dig our way
out of boot failures with ToT QEMU (v6.1.0+).

Link: https://github.com/ClangBuiltLinux/linux/issues/1447


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110580

Files:
  lld/test/ELF/arm-thumb-branch.s
  lld/test/ELF/arm-thunk-linkerscript-orphan.s
  llvm/lib/Target/ARM/MCTargetDesc/ARMMCObjectFileInfo.cpp
  llvm/lib/Target/ARM/MCTargetDesc/ARMMCObjectFileInfo.h
  llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.cpp
  llvm/lib/Target/ARM/MCTargetDesc/CMakeLists.txt
  llvm/utils/gn/secondary/llvm/lib/Target/ARM/MCTargetDesc/BUILD.gn

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