使用 Homebrew, Nix, zypper 安装 lit

项目链接

• 主页

命令和别名

• lit

项目历史

lit developed inside the LLVM project as the project's Python-based test runner. The LLVM documentation describes it as lightweight, portable, and intentionally simple at the command line, while still flexible enough to support different test formats and suite layouts.

As LLVM grew into a family of compiler infrastructure projects, lit became part of the shared contributor workflow. The LLVM Testing Infrastructure Guide documents regression tests under `llvm/test`, `llvm-lit` invocations for individual files and directories, `check-*` build targets, and the use of lit configuration files such as `lit.cfg` and `lit.site.cfg.py`.

采用历史

lit's adoption is unusually deep for a small Python test tool because it is carried by LLVM, Clang, LLD, MLIR, and downstream compiler projects. The PyPI package made the runner available outside a full LLVM checkout, while distribution packages such as Homebrew's `lit` make it convenient for projects that want LLVM-style tests without building all of LLVM.

使用方式

The common pattern is to put `RUN:` lines in test files, use FileCheck or project tools to validate output, and run suites through `lit`, `llvm-lit`, or build-system targets like `check-llvm` and `check-all`. lit's configuration files let projects define substitutions, features, test suffixes, environment settings, and custom formats.

为什么软件包爱好者会关心

lit matters to package maintainers because it is a tiny command whose real importance comes from compiler ecosystems. Packaging it separately lets downstream projects run conformance and regression tests without hauling in an entire LLVM build tree.

时间线

• 2010-09-18: The `lit` package published version 0.1.0 on PyPI.
• 2024-06-25: PyPI recorded the 18.1.8 release of the standalone `lit` package.
• 2026: LLVM 23.0.0git documentation described lit as the LLVM Integrated Tester and documented response files, parallel execution, result output, and test-suite infrastructure.

Related projects

• Related projects include LLVM, Clang, LLD, MLIR, FileCheck, GoogleTest-based LLVM unit tests, and the LLVM test-suite repository.

来源

• https://github.com/llvm/llvm-project
• https://llvm.org/docs/CommandGuide/lit.html
• https://llvm.org/docs/TestingGuide.html
• https://pypi.org/project/lit/