[all-commits] [llvm/llvm-project] 0b8bb8: [MC] Fix crash in x=0; .section x (#183001)

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0b8bb80e27c6051794873a16a0eaf63501a6a1c7
      https://github.com/llvm/llvm-project/commit/0b8bb80e27c6051794873a16a0eaf63501a6a1c7
  Author: Fangrui Song <i at maskray.me>
  Date:   2026-02-24 (Tue, 24 Feb 2026)

  Changed paths:
    M llvm/lib/MC/MCContext.cpp
    M llvm/test/MC/ELF/section-sym-err.s

  Log Message:
  -----------
  [MC] Fix crash in x=0; .section x (#183001)

When an equated symbol (e.g. `x=0`) is followed by `.section x`,
getOrCreateSectionSymbol reports an "invalid symbol redefinition"
error but continues to reuse the equated symbol as a section symbol.
This causes an assertion failure in MCObjectStreamer::changeSection
when `setFragment` is called on the equated symbol.

Fix this by clearning `Sym`.



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