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llvm / llvm-project / lld / 05a295b1c1f96e2e35daf4f90c1a5c43c992e68a
commit05a295b1c1f96e2e35daf4f90c1a5c43c992e68a[log] [tgz]
authorFangrui Song <i@maskray.me>Tue Nov 30 11:06:28 2021 -0800
committerCopybara-Service <copybara-worker@google.com>Tue Nov 30 11:13:38 2021 -0800
treee416f4c02de858d38db98fbe27bc446ad8af8808
parenta4fe1f3f4578e9a03f31ea3167d9e2648219cf06 [diff]
[ELF] Change -z unknown from error to warning

There is a trend of having more optional options (usually security
hardening related) like -z cet-report=, -z bti-report=, -z force-bti.
If ld.lld 14.0.0 uses a warning, in 15/16/17/... timeframe when people
add new options to software, they can worry less about linker errors on ld.lld 14.0.0.

In some cases `-z foo` does essential work where a silent ignore can be
problematic, but the user has received a warning. From my observation, the
doing-essential-work `-z foo` is much fewer than the converse. In addition,
the user who cares can use `--fatal-warnings` (Note: GNU ld doesn't upgrade warnings to errors).
It is unclear whether we need something like `clang -Wunknown-warning-option`.

If we ever run into unfortunate transition like `-z start-stop-gc`, the
affected software (e.g. ldc is a compiler which passes linker options to the underlying ld)
can blindly add the `-z` option, without worrying it may cause a linker error to LLD 14.0.0.

Reviewed By: jrtc27, peter.smith

Differential Revision: https://reviews.llvm.org/D114748

GitOrigin-RevId: 8c3641d03ec0cb0e8730cad349b54d67581b4c73
2 files changed
tree: e416f4c02de858d38db98fbe27bc446ad8af8808
  1. cmake/
  2. COFF/
  3. Common/
  4. docs/
  5. ELF/
  6. include/
  7. lib/
  8. MachO/
  9. MinGW/
  10. test/
  11. tools/
  12. unittests/
  13. utils/
  14. wasm/
  15. .clang-format
  16. .clang-tidy
  17. .gitignore
  18. CMakeLists.txt
  19. CODE_OWNERS.TXT
  20. LICENSE.TXT
  21. README.md
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.