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Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
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Kim Morrison e96b0ff39c
fix: use response files on all platforms to avoid ARG_MAX (#12540) 
This PR extends Lake's use of response files (`@file`) from Windows-only
to all platforms, avoiding `ARG_MAX` limits when invoking `clang`/`ar`
with many object files.

Lake already uses response files on Windows to avoid exceeding CLI
length limits. On macOS and Linux, linking Mathlib's ~15,000 object
files into a shared library can exceed macOS's `ARG_MAX` (262,144
bytes). Both `clang` and `gcc` support `@file` response files on all
platforms, so this is safe to enable unconditionally.

Reported as a macOS issue at
https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/The.20clang.20command.20line.20with.20all.20~15.2C000.20Mathlib.20.2Ec.2Eo.2Eexport/near/574369912:
the Mathlib cache ships Linux `.so` shared libs but not macOS `.dylib`
files, so `precompileModules` on macOS triggers a full re-link that
exceeds `ARG_MAX`.

🤖 Prepared with Claude Code

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-17 04:14:37 +00:00
.claude chore: improve how test suite interacts with stages (#12913) 2026-03-16 15:20:03 +00:00
.github feat: add lake-ci label to enable full Lake test suite (#12836) 2026-03-10 03:23:35 +00:00
.vscode chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
doc chore: improve how test suite interacts with stages (#12913) 2026-03-16 15:20:03 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script fix: use null-safe while-read loop for subverso manifest sync (#12928) 2026-03-16 08:17:32 +00:00
src fix: use response files on all platforms to avoid ARG_MAX (#12540) 2026-03-17 04:14:37 +00:00
stage0 chore: update stage0 2026-03-16 13:15:14 +00:00
tests feat: lake: fixedToolchain package configuration (#12935) 2026-03-17 02:37:55 +00:00
.gitattributes chore: migrate more tests to new test suite (#12809) 2026-03-06 16:52:01 +00:00
.gitignore chore: replace workspace file with .vscode/ settings (#12770) 2026-03-04 01:10:04 +00:00
.gitpod.Dockerfile chore: add gitpod configuration (#6382) 2024-12-15 21:38:13 +00:00
.gitpod.yml chore: add gitpod configuration (#6382) 2024-12-15 21:38:13 +00:00
.ignore chore: ignore stage0/ (for rg etc.) 2022-03-18 15:28:20 +01:00
CMakeLists.txt chore: update leantar to v0.1.19 (#12938) 2026-03-17 03:55:21 +00:00
CMakePresets.json chore: fix ci for new test suite (#12704) 2026-02-27 23:25:37 +00:00
CODEOWNERS chore: make @hargoniX code owner of the compiler (#10732) 2025-10-10 04:43:38 +00:00
CONTRIBUTING.md chore: migrate pkg tests (#12889) 2026-03-11 18:55:46 +00:00
flake.lock chore: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
flake.nix chore: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
lean-toolchain chore: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +00:00
LICENSE
LICENSES feat: bundle leantar with Lean (#12822) 2026-03-09 20:10:59 +00:00
README.md doc: update URLs that are currently pointing to redirects (#10397) 2025-09-17 15:50:07 +00:00
RELEASES.md chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00

README.md

This is the repository for Lean 4.

About

Installation

See Install Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.