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The Cargo.toml file specifies the license as MIT/Apache-2.0. This library, however, inherited LLVM's MIT/NCSA licensing. LLVM has since switched to MIT OR NCSA OR (Apache-2.0 WITH LLVM-exception), so it's probably possible to re-license this crate to MIT/Apache-2.0, however, the fact is that this hasn't happened yet, since the Readme still says that contributors license their contributions under MIT/NCSA. This implies that all contributors would need to agree to license their code under Apache-2.0 first.

This would make the license of this repo MIT/NCSA, but the crate also directly bundles libm, which uses MIT/Apache-2.0. Combining the two, we get MIT OR (Apache-2.0 AND NCSA).

This issue is being discussed in #307. This PR implements what I believe to be the correct solution to this problem. Please exercise caution, as I am not a lawyer.

@Amanieu
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Amanieu commented Dec 17, 2022

Assigning to @pnkfelix since this is license-related.

tgross35 added a commit to tgross35/compiler-builtins that referenced this pull request Oct 25, 2024
Currently, Cargo.toml specifies Apache-2.0 OR MIT, but LICENSE.txt
describes MIT OR NCSA. compiler-builtins is derived from LLVM's
compiler-rt. LICENSE.txt correctly reflects the state of compiler-rt
prior to relicensing on 2019-01-19, during which time software was
available for use under either MIT or the University of Illinois NCSA
license. After relicensing, however, compiler-rt is available for use
only under Apache-2.0 with the LLVM exception; this is not reflected
anywhere in the repository.

Update the SPDX license identifier to `Apache-2.0 WITH LLVM-exception
AND MIT AND (MIT OR Apache-2.0)`. Each AND portion covers something
specific:

* Apache-2.0 WITH LLVM-exception: this covers work that is derived from
  the LLVM repository since after the LLVM relicensing.
* MIT: This covers work that is derived from LLVM before the LLVM
  relicensing (under MIT OR NCSA).
* MIT AND Apache-2.0: This ensures that any contributions to this
  repository, in addition to meeting the above required licenses, is
  also released for use under the Rust-standard Apache-2.0 with no LLVM
  exception.

Fixes: rust-lang#307
Closes: rust-lang#511
tgross35 added a commit to tgross35/compiler-builtins that referenced this pull request Oct 25, 2024
Currently, Cargo.toml specifies Apache-2.0 OR MIT, but LICENSE.txt
describes MIT OR NCSA. compiler-builtins is derived from LLVM's
compiler-rt. LICENSE.txt correctly reflects the state of compiler-rt
prior to relicensing on 2019-01-19, during which time software was
available for use under either MIT or the University of Illinois NCSA
license. After relicensing, however, compiler-rt is available for use
only under Apache-2.0 with the LLVM exception; this is not reflected
anywhere in the repository.

Update the SPDX license identifier to `Apache-2.0 WITH LLVM-exception
AND MIT AND (MIT OR Apache-2.0)`. Each AND portion covers something
specific:

* Apache-2.0 WITH LLVM-exception: this covers work that is derived from
  the LLVM repository since after the LLVM relicensing.
* MIT: This covers work that is derived from LLVM before the LLVM
  relicensing (under MIT OR NCSA).
* MIT AND Apache-2.0: This ensures that any contributions to this
  repository, in addition to meeting the above required licenses, is
  also released for use under the Rust-standard Apache-2.0 with no LLVM
  exception.

Fixes: rust-lang#307
Closes: rust-lang#511
Link: https://rust-lang.zulipchat.com/#narrow/channel/335408-foundation/topic/Request.20for.20legal.20team.20input.20on.20crate.20licensing
tgross35 added a commit to tgross35/compiler-builtins that referenced this pull request Oct 25, 2024
Currently, Cargo.toml specifies Apache-2.0 OR MIT, but LICENSE.txt
describes MIT OR NCSA. compiler-builtins is derived from LLVM's
compiler-rt. LICENSE.txt correctly reflects the state of compiler-rt
prior to relicensing on 2019-01-19, during which time software was
available for use under either MIT or the University of Illinois NCSA
license. After relicensing, however, compiler-rt is available for use
only under Apache-2.0 with the LLVM exception; this is not reflected
anywhere in the repository.

Update the SPDX license identifier to `Apache-2.0 WITH LLVM-exception
AND MIT AND (MIT OR Apache-2.0)`. Each AND portion covers something
specific:

* Apache-2.0 WITH LLVM-exception: this covers work that is derived from
  the LLVM repository since after the LLVM relicensing.
* MIT: This covers work that is derived from LLVM before the LLVM
  relicensing (under MIT OR NCSA).
* MIT AND Apache-2.0: This ensures that any contributions to this
  repository, in addition to meeting the above required licenses, is
  also released for use under the Rust-standard Apache-2.0 with no LLVM
  exception.

See also the parallel license update in rust-lang/libm [1].

Fixes: rust-lang#307
Closes: rust-lang#511
Link: https://rust-lang.zulipchat.com/#narrow/channel/335408-foundation/topic/Request.20for.20legal.20team.20input.20on.20crate.20licensing
Link: rust-lang/libm#317 [1]
tgross35 added a commit to tgross35/compiler-builtins that referenced this pull request Oct 25, 2024
Currently, Cargo.toml specifies Apache-2.0 OR MIT, but LICENSE.txt
describes MIT OR NCSA. compiler-builtins is derived from LLVM's
compiler-rt. LICENSE.txt correctly reflects the state of compiler-rt
prior to relicensing on 2019-01-19, during which time software was
available for use under either MIT or the University of Illinois NCSA
license. After relicensing, however, compiler-rt is available for use
only under Apache-2.0 with the LLVM exception; this is not reflected
anywhere in the repository.

Update the SPDX license identifier to `Apache-2.0 WITH LLVM-exception
AND MIT AND (MIT OR Apache-2.0)`. Each AND portion covers something
specific:

* Apache-2.0 WITH LLVM-exception: this covers work that is derived from
  the LLVM repository since after the LLVM relicensing.
* MIT: This covers work that is derived from LLVM before the LLVM
  relicensing (under MIT OR NCSA).
* MIT AND Apache-2.0: This ensures that any contributions to this
  repository, in addition to meeting the above required licenses, is
  also released for use under the Rust-standard Apache-2.0 with no LLVM
  exception.

See also the parallel license update in rust-lang/libm [1].

Fixes: rust-lang#307
Closes: rust-lang#511
Link: https://rust-lang.zulipchat.com/#narrow/channel/335408-foundation/topic/Request.20for.20legal.20team.20input.20on.20crate.20licensing
Link: rust-lang/libm#317 [1]
tgross35 added a commit to tgross35/compiler-builtins that referenced this pull request Oct 25, 2024
Currently, Cargo.toml specifies Apache-2.0 OR MIT, but LICENSE.txt
describes MIT OR NCSA. compiler-builtins is derived from LLVM's
compiler-rt. LICENSE.txt correctly reflects the state of compiler-rt
prior to relicensing on 2019-01-19, during which time software was
available for use under either MIT or the University of Illinois NCSA
license. After relicensing, however, compiler-rt is available for use
only under Apache-2.0 with the LLVM exception; this is not reflected
anywhere in the repository.

Update the SPDX license identifier to `Apache-2.0 WITH LLVM-exception
AND MIT AND (MIT OR Apache-2.0)`. Each AND portion covers something
specific:

* Apache-2.0 WITH LLVM-exception: this covers work that is derived from
  the LLVM repository since after the LLVM relicensing.
* MIT: This covers work that is derived from LLVM before the LLVM
  relicensing (under MIT OR NCSA).
* MIT AND Apache-2.0: This ensures that any contributions to this
  repository, in addition to meeting the above required licenses, is
  also released for use under the Rust-standard Apache-2.0 with no LLVM
  exception.

See also the parallel license update in rust-lang/libm [1].

Fixes: rust-lang#307
Closes: rust-lang#511
Link: https://rust-lang.zulipchat.com/#narrow/channel/335408-foundation/topic/Request.20for.20legal.20team.20input.20on.20crate.20licensing
Link: rust-lang/libm#317 [1]
tgross35 added a commit to tgross35/compiler-builtins that referenced this pull request Oct 26, 2024
Currently, Cargo.toml specifies Apache-2.0 OR MIT, but LICENSE.txt
describes MIT OR NCSA. compiler-builtins is derived from LLVM's
compiler-rt. LICENSE.txt correctly reflects the state of compiler-rt
prior to relicensing on 2019-01-19, during which time software was
available for use under either MIT or the University of Illinois NCSA
license. After relicensing, however, compiler-rt is available for use
only under Apache-2.0 with the LLVM exception; this is not reflected
anywhere in the repository.

Update the SPDX license identifier to `Apache-2.0 WITH LLVM-exception
AND MIT AND (MIT OR Apache-2.0)`. Each AND portion covers something
specific:

* Apache-2.0 WITH LLVM-exception: this covers work that is derived from
  the LLVM repository since after the LLVM relicensing.
* MIT: This covers work that is derived from LLVM before the LLVM
  relicensing (under MIT OR NCSA).
* MIT AND Apache-2.0: This ensures that any contributions to this
  repository, in addition to meeting the above required licenses, is
  also released for use under the Rust-standard Apache-2.0 with no LLVM
  exception.

See also the parallel license update in rust-lang/libm [1].

Fixes: rust-lang#307
Closes: rust-lang#511
Link: https://rust-lang.zulipchat.com/#narrow/channel/335408-foundation/topic/Request.20for.20legal.20team.20input.20on.20crate.20licensing
Link: rust-lang/libm#317 [1]
@tgross35 tgross35 closed this in 8646087 Oct 26, 2024
@tgross35
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This was superseded by #717

tgross35 added a commit to tgross35/rust that referenced this pull request Jun 3, 2025
Currently, Cargo.toml specifies Apache-2.0 OR MIT, but LICENSE.txt
describes MIT OR NCSA. compiler-builtins is derived from LLVM's
compiler-rt. LICENSE.txt correctly reflects the state of compiler-rt
prior to relicensing on 2019-01-19, during which time software was
available for use under either MIT or the University of Illinois NCSA
license. After relicensing, however, compiler-rt is available for use
only under Apache-2.0 with the LLVM exception; this is not reflected
anywhere in the repository.

Update the SPDX license identifier to `MIT AND Apache-2.0 WITH
LLVM-exception AND (MIT OR Apache-2.0)`. Each AND portion covers
something specific:

* Apache-2.0 WITH LLVM-exception: this covers work that is derived from
  the LLVM repository since after the LLVM relicensing.
* MIT: This covers work that is derived from LLVM before the LLVM
  relicensing (under MIT OR NCSA), as well as the vendored `libm`
  components.
* MIT AND Apache-2.0: This ensures that any contributions to this
  repository, in addition to meeting the above required licenses, is
  also released for use under the Rust-standard Apache-2.0 with no LLVM
  exception.

See also the parallel license update in rust-lang/libm [1].

Fixes: rust-lang/compiler-builtins#307
Closes: rust-lang/compiler-builtins#511
Link: https://rust-lang.zulipchat.com/#narrow/channel/335408-foundation/topic/Request.20for.20legal.20team.20input.20on.20crate.20licensing
Link: rust-lang/libm#317 [1]
tautschnig pushed a commit to model-checking/verify-rust-std that referenced this pull request Jun 17, 2025
Currently, Cargo.toml specifies Apache-2.0 OR MIT, but LICENSE.txt
describes MIT OR NCSA. compiler-builtins is derived from LLVM's
compiler-rt. LICENSE.txt correctly reflects the state of compiler-rt
prior to relicensing on 2019-01-19, during which time software was
available for use under either MIT or the University of Illinois NCSA
license. After relicensing, however, compiler-rt is available for use
only under Apache-2.0 with the LLVM exception; this is not reflected
anywhere in the repository.

Update the SPDX license identifier to `MIT AND Apache-2.0 WITH
LLVM-exception AND (MIT OR Apache-2.0)`. Each AND portion covers
something specific:

* Apache-2.0 WITH LLVM-exception: this covers work that is derived from
  the LLVM repository since after the LLVM relicensing.
* MIT: This covers work that is derived from LLVM before the LLVM
  relicensing (under MIT OR NCSA), as well as the vendored `libm`
  components.
* MIT AND Apache-2.0: This ensures that any contributions to this
  repository, in addition to meeting the above required licenses, is
  also released for use under the Rust-standard Apache-2.0 with no LLVM
  exception.

See also the parallel license update in rust-lang/libm [1].

Fixes: rust-lang/compiler-builtins#307
Closes: rust-lang/compiler-builtins#511
Link: https://rust-lang.zulipchat.com/#narrow/channel/335408-foundation/topic/Request.20for.20legal.20team.20input.20on.20crate.20licensing
Link: rust-lang/libm#317 [1]
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3 participants