[ELF] --wrap: don't clear sym->isUsedInRegularObj if real->isUsedInRegularObj; set wrap's initial binding to sym's

Fix PR49897: if `__real_foo` has the isUsedInRegularObj bit set, we need to
retain `foo` in .symtab, even if `foo` is undefined. The new behavior will match
GNU ld.

Before the patch, we produced an R_X86_64_JUMP_SLOT relocation referencing the
index 0 undefined symbol, which would be erroed by glibc
(see f96ff3c0f8ebd941b3f6b345164c3d858b781484).

While here, fix another bug: if `__wrap_foo` does not exist, its initial binding
should be `foo`'s.

GitOrigin-RevId: 7c74ce3c686938e95a08a05ea1e2a714eac43167
4 files changed
tree: bf591236fa58ffeca22413a5e02f0a3437074634
  1. .clang-format
  2. .clang-tidy
  3. .gitignore
  4. CMakeLists.txt
  5. CODE_OWNERS.TXT
  6. COFF/
  7. Common/
  8. ELF/
  9. LICENSE.TXT
  10. MachO/
  11. MinGW/
  12. README.md
  13. cmake/
  14. docs/
  15. include/
  16. lib/
  17. test/
  18. tools/
  19. unittests/
  20. utils/
  21. wasm/
README.md

LLVM Linker (lld)

This directory and its subdirectories contain source code for the LLVM Linker, a modular cross platform linker which is built as part of the LLVM compiler infrastructure project.

lld is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.

Benchmarking

In order to make sure various developers can evaluate patches over the same tests, we create a collection of self contained programs.

It is hosted at https://s3-us-west-2.amazonaws.com/linker-tests/lld-speed-test.tar.xz

The current sha256 is 10eec685463d5a8bbf08d77f4ca96282161d396c65bd97dc99dbde644a31610f.