[all-commits] [llvm/llvm-project] bf6095: [MC][X86] Allow SHT_PROGBITS for .eh_frame on x86-64

[Fangrui Song via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: bf60953faf3a0b80876e7345462d959586250daf
      https://github.com/llvm/llvm-project/commit/bf60953faf3a0b80876e7345462d959586250daf
  Author: Fangrui Song <maskray at google.com>
  Date:   2020-04-16 (Thu, 16 Apr 2020)

  Changed paths:
    M llvm/lib/MC/MCParser/ELFAsmParser.cpp
    M llvm/test/MC/ELF/section-type-changed.s

  Log Message:
  -----------
  [MC][X86] Allow SHT_PROGBITS for .eh_frame on x86-64

GNU as emits SHT_PROGBITS .eh_frame by default for .cfi_* directives.
We follow x86-64 psABI and use SHT_X86_64_UNWIND for .eh_frame

Don't error for SHT_PROGBITS .eh_frame on x86-64.
This keeps compatibility with `.section .eh_frame,"a", at progbits` in existing assembly files.

See https://groups.google.com/d/msg/x86-64-abi/7sr4E6THl3g/zUU2UPHOAQAJ
for more discussions.

Reviewed By: joerg

Differential Revision: https://reviews.llvm.org/D76151