[all-commits] [llvm/llvm-project] e115c0: [ELF] Reject certain unknown section types (#85173)

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e115c00565be88677e8b7fe021a3e242249c67b8
      https://github.com/llvm/llvm-project/commit/e115c00565be88677e8b7fe021a3e242249c67b8
  Author: Fangrui Song <i at maskray.me>
  Date:   2024-03-15 (Fri, 15 Mar 2024)

  Changed paths:
    M lld/ELF/Config.h
    M lld/ELF/Driver.cpp
    M lld/ELF/InputFiles.cpp
    M lld/ELF/Options.td
    M lld/docs/ld.lld.1
    M lld/test/ELF/incompatible-section-types2.s
    M lld/test/ELF/linkerscript/custom-section-type.s
    A lld/test/ELF/unknown-section.test

  Log Message:
  -----------
  [ELF] Reject certain unknown section types (#85173)

Unknown section sections may require special linking rules, and
rejecting such sections for older linkers may be desired. For example,
if we introduce a new section type to replace a control structure (e.g.
relocations), it would be nice for older linkers to reject the new
section type. GNU ld allows certain unknown section types:

* [SHT_LOUSER,SHT_HIUSER] and non-SHF_ALLOC
* [SHT_LOOS,SHT_HIOS] and non-SHF_OS_NONCONFORMING

but reports errors and stops linking for others (unless
--no-warn-mismatch is specified). Port its behavior. For convenience, we
additionally allow all [SHT_LOPROC,SHT_HIPROC] types so that we don't
have to hard code all known types for each processor.

Close https://github.com/llvm/llvm-project/issues/84812



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