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Merged
merged 7 commits into from
Oct 20, 2025
+45 −98
Merged

Change the tidy license checker #147843

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66c81a0
tidy: Add check that license exceptions are actually used
bjorn3 Oct 18, 2025
3621785
Add Apache-2.0 WITH LLVM-exception to list of allowed licenses
bjorn3 Oct 18, 2025
8510865
Add a couple of licenses that are can be used as MIT, Apache-2.0 or a…
bjorn3 Oct 18, 2025
e7b9694
Add a separate licenses list for licenses that are fine in tools only
bjorn3 Oct 18, 2025
6ab00ba
Minor change
bjorn3 Oct 18, 2025
2ed1f47
Fix typo
bjorn3 Oct 18, 2025
dd70015
Deny all licenses that are not like MIT for the runtime libraries
bjorn3 Oct 18, 2025
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143 changes: 45 additions & 98 deletions src/tools/tidy/src/deps.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,32 +19,52 @@ mod proc_macro_deps;
#[rustfmt::skip]
const LICENSES: &[&str] = &[
// tidy-alphabetical-start
"(MIT OR Apache-2.0) AND Unicode-3.0", // unicode_ident (1.0.14)
"(MIT OR Apache-2.0) AND Unicode-DFS-2016", // unicode_ident (1.0.12)
"0BSD OR MIT OR Apache-2.0", // adler2 license
"0BSD",
"Apache-2.0 / MIT",
"Apache-2.0 OR ISC OR MIT",
"Apache-2.0 OR MIT",
"Apache-2.0 WITH LLVM-exception OR Apache-2.0 OR MIT", // wasi license
"Apache-2.0",
"Apache-2.0/MIT",
"BSD-2-Clause OR Apache-2.0 OR MIT", // zerocopy
"BSD-2-Clause OR MIT OR Apache-2.0",
"BSD-3-Clause/MIT",
"CC0-1.0 OR MIT-0 OR Apache-2.0",
"ISC",
"MIT / Apache-2.0",
"MIT AND (MIT OR Apache-2.0)",
"MIT AND Apache-2.0 WITH LLVM-exception AND (MIT OR Apache-2.0)", // compiler-builtins
"MIT OR Apache-2.0 OR LGPL-2.1-or-later", // r-efi, r-efi-alloc
"MIT OR Apache-2.0 OR BSD-1-Clause",
"MIT OR Apache-2.0 OR LGPL-2.1-or-later", // r-efi, r-efi-alloc; LGPL is not acceptable, but we use it under MIT OR Apache-2.0
"MIT OR Apache-2.0 OR Zlib", // tinyvec_macros
"MIT OR Apache-2.0",
"MIT OR Zlib OR Apache-2.0", // miniz_oxide
"MIT",
"MIT/Apache-2.0",
"Unicode-3.0", // icu4x
"Unicode-DFS-2016", // tinystr
"Unlicense OR MIT",
"Unlicense/MIT",
// tidy-alphabetical-end
];

/// These are licenses that are allowed for rustc, tools, etc. But not for the runtime!
#[rustfmt::skip]
const LICENSES_TOOLS: &[&str] = &[
// tidy-alphabetical-start
"(Apache-2.0 OR MIT) AND BSD-3-Clause",
"(MIT OR Apache-2.0) AND Unicode-3.0", // unicode_ident (1.0.14)
"(MIT OR Apache-2.0) AND Unicode-DFS-2016", // unicode_ident (1.0.12)
"0BSD",
"Apache-2.0 AND ISC",
"Apache-2.0 OR BSL-1.0", // BSL is not acceptable, but we use it under Apache-2.0
"Apache-2.0 WITH LLVM-exception",
"Apache-2.0",
"BSD-2-Clause",
"BSD-3-Clause",
"CC0-1.0 OR Apache-2.0 OR Apache-2.0 WITH LLVM-exception",
"CC0-1.0",
"Unicode-3.0", // icu4x
"Unicode-DFS-2016", // tinystr
"Zlib OR Apache-2.0 OR MIT", // tinyvec
"Zlib",
// tidy-alphabetical-end
];

Expand Down Expand Up @@ -89,17 +109,15 @@ pub(crate) const WORKSPACES: &[WorkspaceInfo<'static>] = &[
)),
submodules: &[],
},
{
WorkspaceInfo {
path: "compiler/rustc_codegen_cranelift",
exceptions: EXCEPTIONS_CRANELIFT,
crates_and_deps: Some((
&["rustc_codegen_cranelift"],
PERMITTED_CRANELIFT_DEPENDENCIES,
PERMITTED_CRANELIFT_DEPS_LOCATION,
)),
submodules: &[],
}
WorkspaceInfo {
path: "compiler/rustc_codegen_cranelift",
exceptions: EXCEPTIONS_CRANELIFT,
crates_and_deps: Some((
&["rustc_codegen_cranelift"],
PERMITTED_CRANELIFT_DEPENDENCIES,
PERMITTED_CRANELIFT_DEPS_LOCATION,
)),
submodules: &[],
},
WorkspaceInfo {
path: "compiler/rustc_codegen_gcc",
Expand Down Expand Up @@ -169,19 +187,8 @@ pub(crate) const WORKSPACES: &[WorkspaceInfo<'static>] = &[
#[rustfmt::skip]
const EXCEPTIONS: ExceptionList = &[
// tidy-alphabetical-start
("ar_archive_writer", "Apache-2.0 WITH LLVM-exception"), // rustc
("arrayref", "BSD-2-Clause"), // rustc
("blake3", "CC0-1.0 OR Apache-2.0 OR Apache-2.0 WITH LLVM-exception"), // rustc
("colored", "MPL-2.0"), // rustfmt
("constant_time_eq", "CC0-1.0 OR MIT-0 OR Apache-2.0"), // rustc
("dissimilar", "Apache-2.0"), // rustdoc, rustc_lexer (few tests) via expect-test, (dev deps)
("fluent-langneg", "Apache-2.0"), // rustc (fluent translations)
("foldhash", "Zlib"), // rustc
("option-ext", "MPL-2.0"), // cargo-miri (via `directories`)
("rustc_apfloat", "Apache-2.0 WITH LLVM-exception"), // rustc (license is the same as LLVM uses)
("ryu", "Apache-2.0 OR BSL-1.0"), // BSL is not acceptble, but we use it under Apache-2.0 // cargo/... (because of serde)
("self_cell", "Apache-2.0"), // rustc (fluent translations)
("wasi-preview1-component-adapter-provider", "Apache-2.0 WITH LLVM-exception"), // rustc
// tidy-alphabetical-end
];

Expand All @@ -198,57 +205,22 @@ const EXCEPTIONS_STDLIB: ExceptionList = &[

const EXCEPTIONS_CARGO: ExceptionList = &[
// tidy-alphabetical-start
("arrayref", "BSD-2-Clause"),
("bitmaps", "MPL-2.0+"),
("blake3", "CC0-1.0 OR Apache-2.0 OR Apache-2.0 WITH LLVM-exception"),
("ciborium", "Apache-2.0"),
("ciborium-io", "Apache-2.0"),
("ciborium-ll", "Apache-2.0"),
("constant_time_eq", "CC0-1.0 OR MIT-0 OR Apache-2.0"),
("dunce", "CC0-1.0 OR MIT-0 OR Apache-2.0"),
("encoding_rs", "(Apache-2.0 OR MIT) AND BSD-3-Clause"),
("fiat-crypto", "MIT OR Apache-2.0 OR BSD-1-Clause"),
("foldhash", "Zlib"),
("im-rc", "MPL-2.0+"),
("libz-rs-sys", "Zlib"),
("normalize-line-endings", "Apache-2.0"),
("openssl", "Apache-2.0"),
("ring", "Apache-2.0 AND ISC"),
("ryu", "Apache-2.0 OR BSL-1.0"), // BSL is not acceptble, but we use it under Apache-2.0
("similar", "Apache-2.0"),
("sized-chunks", "MPL-2.0+"),
("subtle", "BSD-3-Clause"),
("supports-hyperlinks", "Apache-2.0"),
("unicode-bom", "Apache-2.0"),
("zlib-rs", "Zlib"),
// tidy-alphabetical-end
];

const EXCEPTIONS_RUST_ANALYZER: ExceptionList = &[
// tidy-alphabetical-start
("dissimilar", "Apache-2.0"),
("foldhash", "Zlib"),
("notify", "CC0-1.0"),
("option-ext", "MPL-2.0"),
("pulldown-cmark-to-cmark", "Apache-2.0"),
("rustc_apfloat", "Apache-2.0 WITH LLVM-exception"),
("ryu", "Apache-2.0 OR BSL-1.0"), // BSL is not acceptble, but we use it under Apache-2.0
("scip", "Apache-2.0"),
// tidy-alphabetical-end
];

const EXCEPTIONS_RUSTC_PERF: ExceptionList = &[
// tidy-alphabetical-start
("alloc-no-stdlib", "BSD-3-Clause"),
("alloc-stdlib", "BSD-3-Clause"),
("brotli", "BSD-3-Clause/MIT"),
("brotli-decompressor", "BSD-3-Clause/MIT"),
("encoding_rs", "(Apache-2.0 OR MIT) AND BSD-3-Clause"),
("inferno", "CDDL-1.0"),
("option-ext", "MPL-2.0"),
("ryu", "Apache-2.0 OR BSL-1.0"),
("snap", "BSD-3-Clause"),
("subtle", "BSD-3-Clause"),
// tidy-alphabetical-end
];

Expand All @@ -258,36 +230,10 @@ const EXCEPTIONS_RUSTBOOK: ExceptionList = &[
("cssparser-macros", "MPL-2.0"),
("dtoa-short", "MPL-2.0"),
("mdbook", "MPL-2.0"),
("ryu", "Apache-2.0 OR BSL-1.0"),
// tidy-alphabetical-end
];

const EXCEPTIONS_CRANELIFT: ExceptionList = &[
// tidy-alphabetical-start
("cranelift-assembler-x64", "Apache-2.0 WITH LLVM-exception"),
("cranelift-assembler-x64-meta", "Apache-2.0 WITH LLVM-exception"),
("cranelift-bforest", "Apache-2.0 WITH LLVM-exception"),
("cranelift-bitset", "Apache-2.0 WITH LLVM-exception"),
("cranelift-codegen", "Apache-2.0 WITH LLVM-exception"),
("cranelift-codegen-meta", "Apache-2.0 WITH LLVM-exception"),
("cranelift-codegen-shared", "Apache-2.0 WITH LLVM-exception"),
("cranelift-control", "Apache-2.0 WITH LLVM-exception"),
("cranelift-entity", "Apache-2.0 WITH LLVM-exception"),
("cranelift-frontend", "Apache-2.0 WITH LLVM-exception"),
("cranelift-isle", "Apache-2.0 WITH LLVM-exception"),
("cranelift-jit", "Apache-2.0 WITH LLVM-exception"),
("cranelift-module", "Apache-2.0 WITH LLVM-exception"),
("cranelift-native", "Apache-2.0 WITH LLVM-exception"),
("cranelift-object", "Apache-2.0 WITH LLVM-exception"),
("cranelift-srcgen", "Apache-2.0 WITH LLVM-exception"),
("foldhash", "Zlib"),
("mach2", "BSD-2-Clause OR MIT OR Apache-2.0"),
("regalloc2", "Apache-2.0 WITH LLVM-exception"),
("target-lexicon", "Apache-2.0 WITH LLVM-exception"),
("wasmtime-jit-icache-coherence", "Apache-2.0 WITH LLVM-exception"),
("wasmtime-math", "Apache-2.0 WITH LLVM-exception"),
// tidy-alphabetical-end
];
const EXCEPTIONS_CRANELIFT: ExceptionList = &[];

const EXCEPTIONS_GCC: ExceptionList = &[
// tidy-alphabetical-start
Expand All @@ -296,13 +242,9 @@ const EXCEPTIONS_GCC: ExceptionList = &[
// tidy-alphabetical-end
];

const EXCEPTIONS_BOOTSTRAP: ExceptionList = &[
("ryu", "Apache-2.0 OR BSL-1.0"), // through serde. BSL is not acceptble, but we use it under Apache-2.0
];
const EXCEPTIONS_BOOTSTRAP: ExceptionList = &[];

const EXCEPTIONS_UEFI_QEMU_TEST: ExceptionList = &[
("r-efi", "MIT OR Apache-2.0 OR LGPL-2.1-or-later"), // LGPL is not acceptable, but we use it under MIT OR Apache-2.0
];
const EXCEPTIONS_UEFI_QEMU_TEST: ExceptionList = &[];

#[derive(Clone, Copy)]
struct ListLocation {
Expand Down Expand Up @@ -867,6 +809,11 @@ fn check_license_exceptions(
}
}
}
if LICENSES.contains(license) || LICENSES_TOOLS.contains(license) {
check.error(format!(
"dependency exception `{name}` is not necessary. `{license}` is an allowed license"
));
}
}

let exception_names: Vec<_> = exceptions.iter().map(|(name, _license)| *name).collect();
Expand All @@ -890,7 +837,7 @@ fn check_license_exceptions(
continue;
}
};
if !LICENSES.contains(&license.as_str()) {
if !LICENSES.contains(&license.as_str()) && !LICENSES_TOOLS.contains(&license.as_str()) {
check.error(format!(
"invalid license `{}` for package `{}` in workspace `{workspace}`",
license, pkg.id
Expand Down
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