[all-commits] [llvm/llvm-project] 994cea: [ELF] Refine isExported/isPreemptible condition

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 994cea3f0a2d0caf4d66321ad5a06ab330144d89
      https://github.com/llvm/llvm-project/commit/994cea3f0a2d0caf4d66321ad5a06ab330144d89
  Author: Fangrui Song <i at maskray.me>
  Date:   2025-01-31 (Fri, 31 Jan 2025)

  Changed paths:
    M lld/ELF/Config.h
    M lld/ELF/Driver.cpp
    M lld/ELF/Symbols.cpp
    M lld/ELF/SyntheticSections.cpp
    M lld/ELF/Writer.cpp
    M lld/test/ELF/executable-undefined-ignoreall.s
    M lld/test/ELF/ppc32-weak-undef-call.s
    M lld/test/ELF/ppc64-undefined-weak.s
    M lld/test/ELF/riscv-gp.s
    M lld/test/ELF/weak-undef-lib.s
    M lld/test/ELF/weak-undef-no-dynamic-linker.s
    M lld/test/ELF/weak-undef-rw.s

  Log Message:
  -----------
  [ELF] Refine isExported/isPreemptible condition

Commit f10441ad003236ef3b9e5415a571d2be0c0ce5ce dropped a special case
for isUndefWeak and --no-dynamic-linking but also made --export-dynamic
ineffective for static PIE.

This change restores the --export-dynamic behavior and entirely drops
special handling of --no-dynamic-linker:

* -pie with no input DSO, similar to --no-dynamic-linker, suppresses
  undefined symbols in .dynsym

The new behaviors resemble GNU ld more.



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