Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Add tier 3 no_std AArch64/x86_64 support for the QNX Neutrino RTOS #102701

Merged
merged 4 commits into from
Nov 12, 2022

Conversation

flba-eb
Copy link
Contributor

@flba-eb flba-eb commented Oct 5, 2022

This change allows to compile no_std applications for the QNX Neutrino Real-time operating system for ARM 64 bit CPUs.
Tested with QNX Neutrino 7.1.

Partially discussed in zulip.


Tier 3 target policy

At this tier, the Rust project provides no official support for a target, so we
place minimal requirements on the introduction of targets.

A proposed new tier 3 target must be reviewed and approved by a member of the
compiler team based on these requirements. The reviewer may choose to gauge
broader compiler team consensus via a [Major Change Proposal (MCP)][MCP].

A proposed target or target-specific patch that substantially changes code
shared with other targets (not just target-specific code) must be reviewed and
approved by the appropriate team for that shared code before acceptance.

  • A tier 3 target must have a designated developer or developers (the "target
    maintainers") on record to be CCed when issues arise regarding the target.
    (The mechanism to track and CC such developers may evolve over time.)

See also nto-qnx.md; designated developers are:

  • Targets must use naming consistent with any existing targets; for instance, a
    target for the same CPU or OS as an existing Rust target should use the same
    name for that CPU or OS. Targets should normally use the same names and
    naming conventions as used elsewhere in the broader ecosystem beyond Rust
    (such as in other toolchains), unless they have a very good reason to
    diverge. Changing the name of a target can be highly disruptive, especially
    once the target reaches a higher tier, so getting the name right is important
    even for a tier 3 target.
  • Target names should not introduce undue confusion or ambiguity unless
    absolutely necessary to maintain ecosystem compatibility. For example, if
    the name of the target makes people extremely likely to form incorrect
    beliefs about what it targets, the name should be changed or augmented to
    disambiguate it.

aarch64-unknown-nto-qnx7.1.0 and x86_64-pc-nto-qnx7.1.0 have been chosen as these
strings are used in the official QNX Neutrino toolchain (for C/C ). It should also
harmonize with the other Rust targets.

The version (7.1.0 ) is needed because libc needs to distinguish between different
versions (target_env is set to 710 for QNX Neutrino 7.1): For example, functions are removed from 7.0
to 7.1, sometimes the signature of functions is slightly changed or size/alignment of structs.
I'm expecting the same for future versions.
This works very well in e.g. libc (tested with 7.0 which I'm not going to support).

  • Tier 3 targets may have unusual requirements to build or use, but must not
    create legal issues or impose onerous legal terms for the Rust project or for
    Rust developers or users.
  • The target must not introduce license incompatibilities.

No issue as far as I can see.

  • Anything added to the Rust repository must be under the standard Rust
    license (MIT OR Apache-2.0).

Ok

  • The target must not cause the Rust tools or libraries built for any other
    host (even when supporting cross-compilation to the target) to depend
    on any new dependency less permissive than the Rust licensing policy. This
    applies whether the dependency is a Rust crate that would require adding
    new license exceptions (as specified by the tidy tool in the
    rust-lang/rust repository), or whether the dependency is a native library
    or binary. In other words, the introduction of the target must not cause a
    user installing or running a version of Rust or the Rust tools to be
    subject to any new license requirements.

No change for host tools. When cross-compiling for QNX Neutrino, the compiler/linker
driver "qcc" is called. It should be possible (but not tested) to use other
(OSS) compilers/linkers to produce working binaries.

  • Compiling, linking, and emitting functional binaries, libraries, or other
    code for the target (whether hosted on the target itself or cross-compiling
    from another target) must not depend on proprietary (non-FOSS) libraries.
    Host tools built for the target itself may depend on the ordinary runtime
    libraries supplied by the platform and commonly used by other applications
    built for the target, but those libraries must not be required for code
    generation for the target; cross-compilation to the target must not require
    such libraries at all. For instance, rustc built for the target may
    depend on a common proprietary C runtime library or console output library,
    but must not depend on a proprietary code generation library or code
    optimization library. Rust's license permits such combinations, but the
    Rust project has no interest in maintaining such combinations within the
    scope of Rust itself, even at tier 3.

Only rustc is required for code generation (i.e. no additional libraries to
generate code). Linking of executables requires the ordinary runtime libraries
crt and libc.

  • "onerous" here is an intentionally subjective term. At a minimum, "onerous"
    legal/licensing terms include but are not limited to: non-disclosure
    requirements, non-compete requirements, contributor license agreements
    (CLAs) or equivalent, "non-commercial"/"research-only"/etc terms,
    requirements conditional on the employer or employment of any particular
    Rust developers, revocable terms, any requirements that create liability
    for the Rust project or its developers or users, or any requirements that
    adversely affect the livelihood or prospects of the Rust project or its
    developers or users.
  • Neither this policy nor any decisions made regarding targets shall create any
    binding agreement or estoppel by any party. If any member of an approving
    Rust team serves as one of the maintainers of a target, or has any legal or
    employment requirement (explicit or implicit) that might affect their
    decisions regarding a target, they must recuse themselves from any approval
    decisions regarding the target's tier status, though they may otherwise
    participate in discussions.
  • This requirement does not prevent part or all of this policy from being
    cited in an explicit contract or work agreement (e.g. to implement or
    maintain support for a target). This requirement exists to ensure that a
    developer or team responsible for reviewing and approving a target does not
    face any legal threats or obligations that would prevent them from freely
    exercising their judgment in such approval, even if such judgment involves
    subjective matters or goes beyond the letter of these requirements.

I see no issues with any of the above.

  • Tier 3 targets should attempt to implement as much of the standard libraries
    as possible and appropriate (core for most targets, alloc for targets
    that can support dynamic memory allocation, std for targets with an
    operating system or equivalent layer of system-provided functionality), but
    may leave some code unimplemented (either unavailable or stubbed out as
    appropriate), whether because the target makes it impossible to implement or
    challenging to implement. The authors of pull requests are not obligated to
    avoid calling any portions of the standard library on the basis of a tier 3
    target not implementing those portions.

core and alloc should be working (no change required). std implementation
is ongoing and will be provided separately.

  • The target must provide documentation for the Rust community explaining how
    to build for the target, using cross-compilation if possible. If the target
    supports running binaries, or running tests (even if they do not pass), the
    documentation must explain how to run such binaries or tests for the target,
    using emulation if possible or dedicated hardware if necessary.

see nto-qnx.md

  • Tier 3 targets must not impose burden on the authors of pull requests, or
    other developers in the community, to maintain the target. In particular,
    do not post comments (automated or manual) on a PR that derail or suggest a
    block on the PR based on a tier 3 target. Do not send automated messages or
    notifications (via any medium, including via @) to a PR author or others
    involved with a PR regarding a tier 3 target, unless they have opted into
    such messages.
  • Backlinks such as those generated by the issue/PR tracker when linking to
    an issue or PR are not considered a violation of this policy, within
    reason. However, such messages (even on a separate repository) must not
    generate notifications to anyone involved with a PR who has not requested
    such notifications.

Ok

  • Patches adding or updating tier 3 targets must not break any existing tier 2
    or tier 1 target, and must not knowingly break another tier 3 target without
    approval of either the compiler team or the maintainers of the other tier 3
    target.
  • In particular, this may come up when working on closely related targets,
    such as variations of the same architecture with different features. Avoid
    introducing unconditional uses of features that another variation of the
    target may not have; use conditional compilation or runtime detection, as
    appropriate, to let each target run code supported by that target.

Ok

@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Oct 5, 2022
@rust-highfive
Copy link
Collaborator

r? @JohnTitor

(rust-highfive has picked a reviewer for you, use r? to override)

@rust-highfive
Copy link
Collaborator

⚠️ Warning ⚠️

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 5, 2022
@flba-eb flba-eb marked this pull request as ready for review October 5, 2022 12:00
@flba-eb flba-eb changed the title Add no_std AArch64 support for the QNX RTOS Add tier 3 no_std AArch64 support for the QNX RTOS Oct 7, 2022
@JohnTitor
Copy link
Member

r? @joshtriplett as I'm not familiar with adding a new target

@rust-log-analyzer

This comment has been minimized.

@rust-log-analyzer

This comment has been minimized.

@flba-eb flba-eb force-pushed the add_qnx_nostd_support branch 2 times, most recently from 7cf22f9 to ad5629e Compare October 11, 2022 07:41
@flba-eb flba-eb marked this pull request as draft October 19, 2022 14:38
@flba-eb
Copy link
Contributor Author

flba-eb commented Oct 19, 2022

Converted back to draft state for further discussions.

@flba-eb flba-eb changed the title Add tier 3 no_std AArch64 support for the QNX RTOS Add tier 3 no_std AArch64 support for the QNX Neutrino RTOS Oct 25, 2022
@flba-eb flba-eb force-pushed the add_qnx_nostd_support branch 2 times, most recently from 471bbbb to 11821b4 Compare October 25, 2022 08:31
@flba-eb flba-eb marked this pull request as ready for review October 25, 2022 09:12
@flba-eb
Copy link
Contributor Author

flba-eb commented Oct 26, 2022

As discussed with @joshtriplett , the changeset has been updated: target_env = "nto71".

@rustbot
Copy link
Collaborator

rustbot commented Oct 27, 2022

These commits modify compiler targets.
(See the Target Tier Policy.)

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo

Some changes occurred in compiler/rustc_codegen_cranelift

cc @bjorn3

@flba-eb flba-eb marked this pull request as draft October 27, 2022 06:57
Manishearth added a commit to Manishearth/rust that referenced this pull request Nov 11, 2022
…jgillot

Add tier 3 no_std AArch64/x86_64 support for the QNX Neutrino RTOS

This change allows to compile `no_std` applications for the QNX Neutrino Real-time operating system for ARM 64 bit CPUs.
Tested with QNX Neutrino 7.1.

Partially discussed in [zulip](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/Adding.20QNX.20as.20target).

---

> ## Tier 3 target policy
>
> At this tier, the Rust project provides no official support for a target, so we
place minimal requirements on the introduction of targets.
>
>A proposed new tier 3 target must be reviewed and approved by a member of the
compiler team based on these requirements. The reviewer may choose to gauge
broader compiler team consensus via a [Major Change Proposal (MCP)][MCP].
>
>A proposed target or target-specific patch that substantially changes code
shared with other targets (not just target-specific code) must be reviewed and
approved by the appropriate team for that shared code before acceptance.
>
>- A tier 3 target must have a designated developer or developers (the "target
  maintainers") on record to be CCed when issues arise regarding the target.
  (The mechanism to track and CC such developers may evolve over time.)

See also nto-qnx.md; designated developers are:

- Florian Bartels, `[email protected]`, https://github.com/flba-eb
- Tristan Roach, `[email protected]`, https://github.com/gh-tr

> - Targets must use naming consistent with any existing targets; for instance, a
  target for the same CPU or OS as an existing Rust target should use the same
  name for that CPU or OS. Targets should normally use the same names and
  naming conventions as used elsewhere in the broader ecosystem beyond Rust
  (such as in other toolchains), unless they have a very good reason to
  diverge. Changing the name of a target can be highly disruptive, especially
  once the target reaches a higher tier, so getting the name right is important
  even for a tier 3 target.
>  - Target names should not introduce undue confusion or ambiguity unless
    absolutely necessary to maintain ecosystem compatibility. For example, if
    the name of the target makes people extremely likely to form incorrect
    beliefs about what it targets, the name should be changed or augmented to
    disambiguate it.

`aarch64-unknown-nto-qnx7.1.0` and `x86_64-pc-nto-qnx7.1.0` have been chosen as these
strings are used in the official QNX Neutrino toolchain (for `C`/`C  `). It should also
harmonize with the other Rust targets.

The version (`7.1.0 `) is needed because libc needs to distinguish between different
versions (`target_env` is set to `710` for QNX Neutrino 7.1): For example, functions are removed from 7.0
to 7.1, sometimes the signature of functions is slightly changed or size/alignment of structs.
I'm expecting the same for future versions.
This works very well in e.g. `libc` (tested with 7.0 which I'm not going to support).

> - Tier 3 targets may have unusual requirements to build or use, but must not
  create legal issues or impose onerous legal terms for the Rust project or for
  Rust developers or users.
>  - The target must not introduce license incompatibilities.

No issue as far as I can see.

>  - Anything added to the Rust repository must be under the standard Rust
    license (`MIT OR Apache-2.0`).

Ok

>  - The target must not cause the Rust tools or libraries built for any other
    host (even when supporting cross-compilation to the target) to depend
    on any new dependency less permissive than the Rust licensing policy. This
    applies whether the dependency is a Rust crate that would require adding
    new license exceptions (as specified by the `tidy` tool in the
    rust-lang/rust repository), or whether the dependency is a native library
    or binary. In other words, the introduction of the target must not cause a
    user installing or running a version of Rust or the Rust tools to be
    subject to any new license requirements.

No change for host tools. When cross-compiling for QNX Neutrino, the compiler/linker
driver "qcc" is called. It should be possible (but not tested) to use other
(OSS) compilers/linkers to produce working binaries.

>  - Compiling, linking, and emitting functional binaries, libraries, or other
    code for the target (whether hosted on the target itself or cross-compiling
    from another target) must not depend on proprietary (non-FOSS) libraries.
    Host tools built for the target itself may depend on the ordinary runtime
    libraries supplied by the platform and commonly used by other applications
    built for the target, but those libraries must not be required for code
    generation for the target; cross-compilation to the target must not require
    such libraries at all. For instance, `rustc` built for the target may
    depend on a common proprietary C runtime library or console output library,
    but must not depend on a proprietary code generation library or code
    optimization library. Rust's license permits such combinations, but the
    Rust project has no interest in maintaining such combinations within the
    scope of Rust itself, even at tier 3.

Only rustc is required for code generation (i.e. no additional libraries to
generate code). Linking of executables requires the ordinary runtime libraries
`crt` and `libc`.

>  - "onerous" here is an intentionally subjective term. At a minimum, "onerous"
    legal/licensing terms include but are *not* limited to: non-disclosure
    requirements, non-compete requirements, contributor license agreements
    (CLAs) or equivalent, "non-commercial"/"research-only"/etc terms,
    requirements conditional on the employer or employment of any particular
    Rust developers, revocable terms, any requirements that create liability
    for the Rust project or its developers or users, or any requirements that
    adversely affect the livelihood or prospects of the Rust project or its
    developers or users.
>- Neither this policy nor any decisions made regarding targets shall create any
  binding agreement or estoppel by any party. If any member of an approving
  Rust team serves as one of the maintainers of a target, or has any legal or
  employment requirement (explicit or implicit) that might affect their
  decisions regarding a target, they must recuse themselves from any approval
  decisions regarding the target's tier status, though they may otherwise
  participate in discussions.
>  - This requirement does not prevent part or all of this policy from being
    cited in an explicit contract or work agreement (e.g. to implement or
    maintain support for a target). This requirement exists to ensure that a
    developer or team responsible for reviewing and approving a target does not
    face any legal threats or obligations that would prevent them from freely
    exercising their judgment in such approval, even if such judgment involves
    subjective matters or goes beyond the letter of these requirements.

I see no issues with any of the above.

>- Tier 3 targets should attempt to implement as much of the standard libraries
  as possible and appropriate (`core` for most targets, `alloc` for targets
  that can support dynamic memory allocation, `std` for targets with an
  operating system or equivalent layer of system-provided functionality), but
  may leave some code unimplemented (either unavailable or stubbed out as
  appropriate), whether because the target makes it impossible to implement or
  challenging to implement. The authors of pull requests are not obligated to
  avoid calling any portions of the standard library on the basis of a tier 3
  target not implementing those portions.

`core` and `alloc` should be working (no change required). `std` implementation
is ongoing and will be provided separately.

>- The target must provide documentation for the Rust community explaining how
  to build for the target, using cross-compilation if possible. If the target
  supports running binaries, or running tests (even if they do not pass), the
  documentation must explain how to run such binaries or tests for the target,
  using emulation if possible or dedicated hardware if necessary.

see nto-qnx.md

>- Tier 3 targets must not impose burden on the authors of pull requests, or
  other developers in the community, to maintain the target. In particular,
  do not post comments (automated or manual) on a PR that derail or suggest a
  block on the PR based on a tier 3 target. Do not send automated messages or
  notifications (via any medium, including via ````@`)``` to a PR author or others
  involved with a PR regarding a tier 3 target, unless they have opted into
  such messages.
>  - Backlinks such as those generated by the issue/PR tracker when linking to
    an issue or PR are not considered a violation of this policy, within
    reason. However, such messages (even on a separate repository) must not
    generate notifications to anyone involved with a PR who has not requested
    such notifications.

Ok

>- Patches adding or updating tier 3 targets must not break any existing tier 2
  or tier 1 target, and must not knowingly break another tier 3 target without
  approval of either the compiler team or the maintainers of the other tier 3
  target.
>  - In particular, this may come up when working on closely related targets,
    such as variations of the same architecture with different features. Avoid
    introducing unconditional uses of features that another variation of the
    target may not have; use conditional compilation or runtime detection, as
    appropriate, to let each target run code supported by that target.

Ok
@Manishearth
Copy link
Member

@bors r- rollup=iffy

failed CI #104307 (comment)

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Nov 12, 2022
@flba-eb
Copy link
Contributor Author

flba-eb commented Nov 12, 2022

@cjgillot Thanks for the review! The example code did not compile (on Windows) so I've removed it (for now).

Code is QNX/nto specific and will not link on Windows.
@cjgillot
Copy link
Contributor

@bors r

@bors
Copy link
Contributor

bors commented Nov 12, 2022

📌 Commit a4cafc8 has been approved by cjgillot

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Nov 12, 2022
@bors
Copy link
Contributor

bors commented Nov 12, 2022

⌛ Testing commit a4cafc8 with merge aa05f99...

@bors
Copy link
Contributor

bors commented Nov 12, 2022

☀️ Test successful - checks-actions
Approved by: cjgillot
Pushing aa05f99 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Nov 12, 2022
@bors bors merged commit aa05f99 into rust-lang:master Nov 12, 2022
@rustbot rustbot added this to the 1.67.0 milestone Nov 12, 2022
@rust-timer
Copy link
Collaborator

Finished benchmarking commit (aa05f99): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
0.7% [0.7%, 0.7%] 1
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) - - 0

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-4.1% [-7.9%, -1.1%] 13
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) -4.1% [-7.9%, -1.1%] 13

Aaron1011 pushed a commit to Aaron1011/rust that referenced this pull request Jan 6, 2023
…illot

Add tier 3 no_std AArch64/x86_64 support for the QNX Neutrino RTOS

This change allows to compile `no_std` applications for the QNX Neutrino Real-time operating system for ARM 64 bit CPUs.
Tested with QNX Neutrino 7.1.

Partially discussed in [zulip](https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/Adding.20QNX.20as.20target).

---

> ## Tier 3 target policy
>
> At this tier, the Rust project provides no official support for a target, so we
place minimal requirements on the introduction of targets.
>
>A proposed new tier 3 target must be reviewed and approved by a member of the
compiler team based on these requirements. The reviewer may choose to gauge
broader compiler team consensus via a [Major Change Proposal (MCP)][MCP].
>
>A proposed target or target-specific patch that substantially changes code
shared with other targets (not just target-specific code) must be reviewed and
approved by the appropriate team for that shared code before acceptance.
>
>- A tier 3 target must have a designated developer or developers (the "target
  maintainers") on record to be CCed when issues arise regarding the target.
  (The mechanism to track and CC such developers may evolve over time.)

See also nto-qnx.md; designated developers are:

- Florian Bartels, `[email protected]`, https://github.com/flba-eb
- Tristan Roach, `[email protected]`, https://github.com/gh-tr

> - Targets must use naming consistent with any existing targets; for instance, a
  target for the same CPU or OS as an existing Rust target should use the same
  name for that CPU or OS. Targets should normally use the same names and
  naming conventions as used elsewhere in the broader ecosystem beyond Rust
  (such as in other toolchains), unless they have a very good reason to
  diverge. Changing the name of a target can be highly disruptive, especially
  once the target reaches a higher tier, so getting the name right is important
  even for a tier 3 target.
>  - Target names should not introduce undue confusion or ambiguity unless
    absolutely necessary to maintain ecosystem compatibility. For example, if
    the name of the target makes people extremely likely to form incorrect
    beliefs about what it targets, the name should be changed or augmented to
    disambiguate it.

`aarch64-unknown-nto-qnx7.1.0` and `x86_64-pc-nto-qnx7.1.0` have been chosen as these
strings are used in the official QNX Neutrino toolchain (for `C`/`C  `). It should also
harmonize with the other Rust targets.

The version (`7.1.0 `) is needed because libc needs to distinguish between different
versions (`target_env` is set to `710` for QNX Neutrino 7.1): For example, functions are removed from 7.0
to 7.1, sometimes the signature of functions is slightly changed or size/alignment of structs.
I'm expecting the same for future versions.
This works very well in e.g. `libc` (tested with 7.0 which I'm not going to support).

> - Tier 3 targets may have unusual requirements to build or use, but must not
  create legal issues or impose onerous legal terms for the Rust project or for
  Rust developers or users.
>  - The target must not introduce license incompatibilities.

No issue as far as I can see.

>  - Anything added to the Rust repository must be under the standard Rust
    license (`MIT OR Apache-2.0`).

Ok

>  - The target must not cause the Rust tools or libraries built for any other
    host (even when supporting cross-compilation to the target) to depend
    on any new dependency less permissive than the Rust licensing policy. This
    applies whether the dependency is a Rust crate that would require adding
    new license exceptions (as specified by the `tidy` tool in the
    rust-lang/rust repository), or whether the dependency is a native library
    or binary. In other words, the introduction of the target must not cause a
    user installing or running a version of Rust or the Rust tools to be
    subject to any new license requirements.

No change for host tools. When cross-compiling for QNX Neutrino, the compiler/linker
driver "qcc" is called. It should be possible (but not tested) to use other
(OSS) compilers/linkers to produce working binaries.

>  - Compiling, linking, and emitting functional binaries, libraries, or other
    code for the target (whether hosted on the target itself or cross-compiling
    from another target) must not depend on proprietary (non-FOSS) libraries.
    Host tools built for the target itself may depend on the ordinary runtime
    libraries supplied by the platform and commonly used by other applications
    built for the target, but those libraries must not be required for code
    generation for the target; cross-compilation to the target must not require
    such libraries at all. For instance, `rustc` built for the target may
    depend on a common proprietary C runtime library or console output library,
    but must not depend on a proprietary code generation library or code
    optimization library. Rust's license permits such combinations, but the
    Rust project has no interest in maintaining such combinations within the
    scope of Rust itself, even at tier 3.

Only rustc is required for code generation (i.e. no additional libraries to
generate code). Linking of executables requires the ordinary runtime libraries
`crt` and `libc`.

>  - "onerous" here is an intentionally subjective term. At a minimum, "onerous"
    legal/licensing terms include but are *not* limited to: non-disclosure
    requirements, non-compete requirements, contributor license agreements
    (CLAs) or equivalent, "non-commercial"/"research-only"/etc terms,
    requirements conditional on the employer or employment of any particular
    Rust developers, revocable terms, any requirements that create liability
    for the Rust project or its developers or users, or any requirements that
    adversely affect the livelihood or prospects of the Rust project or its
    developers or users.
>- Neither this policy nor any decisions made regarding targets shall create any
  binding agreement or estoppel by any party. If any member of an approving
  Rust team serves as one of the maintainers of a target, or has any legal or
  employment requirement (explicit or implicit) that might affect their
  decisions regarding a target, they must recuse themselves from any approval
  decisions regarding the target's tier status, though they may otherwise
  participate in discussions.
>  - This requirement does not prevent part or all of this policy from being
    cited in an explicit contract or work agreement (e.g. to implement or
    maintain support for a target). This requirement exists to ensure that a
    developer or team responsible for reviewing and approving a target does not
    face any legal threats or obligations that would prevent them from freely
    exercising their judgment in such approval, even if such judgment involves
    subjective matters or goes beyond the letter of these requirements.

I see no issues with any of the above.

>- Tier 3 targets should attempt to implement as much of the standard libraries
  as possible and appropriate (`core` for most targets, `alloc` for targets
  that can support dynamic memory allocation, `std` for targets with an
  operating system or equivalent layer of system-provided functionality), but
  may leave some code unimplemented (either unavailable or stubbed out as
  appropriate), whether because the target makes it impossible to implement or
  challenging to implement. The authors of pull requests are not obligated to
  avoid calling any portions of the standard library on the basis of a tier 3
  target not implementing those portions.

`core` and `alloc` should be working (no change required). `std` implementation
is ongoing and will be provided separately.

>- The target must provide documentation for the Rust community explaining how
  to build for the target, using cross-compilation if possible. If the target
  supports running binaries, or running tests (even if they do not pass), the
  documentation must explain how to run such binaries or tests for the target,
  using emulation if possible or dedicated hardware if necessary.

see nto-qnx.md

>- Tier 3 targets must not impose burden on the authors of pull requests, or
  other developers in the community, to maintain the target. In particular,
  do not post comments (automated or manual) on a PR that derail or suggest a
  block on the PR based on a tier 3 target. Do not send automated messages or
  notifications (via any medium, including via ``@`)` to a PR author or others
  involved with a PR regarding a tier 3 target, unless they have opted into
  such messages.
>  - Backlinks such as those generated by the issue/PR tracker when linking to
    an issue or PR are not considered a violation of this policy, within
    reason. However, such messages (even on a separate repository) must not
    generate notifications to anyone involved with a PR who has not requested
    such notifications.

Ok

>- Patches adding or updating tier 3 targets must not break any existing tier 2
  or tier 1 target, and must not knowingly break another tier 3 target without
  approval of either the compiler team or the maintainers of the other tier 3
  target.
>  - In particular, this may come up when working on closely related targets,
    such as variations of the same architecture with different features. Avoid
    introducing unconditional uses of features that another variation of the
    target may not have; use conditional compilation or runtime detection, as
    appropriate, to let each target run code supported by that target.

Ok
wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request Jan 27, 2023
Pkgsrc changes:
 * Adjust patches and cargo checksums to new versions,
   but also one strange "mips" conditional.

Upstream changes:

Version 1.67.0 (2023-01-26)
==========================

Language
--------

- [Make `Sized` predicates coinductive, allowing cycles.]
  (rust-lang/rust#100386)
- [`#[must_use]` annotations on `async fn` also affect the
  `Future::Output`.] (rust-lang/rust#100633)
- [Elaborate supertrait obligations when deducing closure signatures.]
  (rust-lang/rust#101834)
- [Invalid literals are no longer an error under `cfg(FALSE)`.]
  (rust-lang/rust#102944)
- [Unreserve braced enum variants in value namespace.]
  (rust-lang/rust#103578)

Compiler
--------

- [Enable varargs support for calling conventions other than `C`
  or `cdecl`.] (rust-lang/rust#97971)
- [Add new MIR constant propagation based on dataflow analysis.]
  (rust-lang/rust#101168)
- [Optimize field ordering by grouping m\*2^n-sized fields with
  equivalently aligned ones.] (rust-lang/rust#102750)
- [Stabilize native library modifier `verbatim`.]
  (rust-lang/rust#104360)

Added and removed targets:

- [Add a tier 3 target for PowerPC on AIX]
  (rust-lang/rust#102293), `powerpc64-ibm-aix`.
- [Add a tier 3 target for the Sony PlayStation 1]
  (rust-lang/rust#102689), `mipsel-sony-psx`.
- [Add tier 3 `no_std` targets for the QNX Neutrino RTOS]
  (rust-lang/rust#102701),
  `aarch64-unknown-nto-qnx710` and `x86_64-pc-nto-qnx710`.
- [Remove tier 3 `linuxkernel` targets]
  (rust-lang/rust#104015) (not used by the
  actual kernel).

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

Libraries
---------

- [Merge `crossbeam-channel` into `std::sync::mpsc`.]
  (rust-lang/rust#93563)
- [Fix inconsistent rounding of 0.5 when formatted to 0 decimal places.]
  (rust-lang/rust#102935)
- [Derive `Eq` and `Hash` for `ControlFlow`.]
  (rust-lang/rust#103084)
- [Don't build `compiler_builtins` with `-C panic=abort`.]
  (rust-lang/rust#103786)

Stabilized APIs
---------------

- [`{integer}::checked_ilog`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog)
- [`{integer}::checked_ilog2`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog2)
- [`{integer}::checked_ilog10`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog10)
- [`{integer}::ilog`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog)
- [`{integer}::ilog2`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog2)
- [`{integer}::ilog10`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog10)
- [`NonZeroU*::ilog2`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog2)
- [`NonZeroU*::ilog10`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog10)
- [`NonZero*::BITS`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#associatedconstant.BITS)

These APIs are now stable in const contexts:

- [`char::from_u32`]
  (https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_u32)
- [`char::from_digit`]
  (https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_digit)
- [`char::to_digit`]
  (https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_digit)
- [`core::char::from_u32`]
  (https://doc.rust-lang.org/stable/core/char/fn.from_u32.html)
- [`core::char::from_digit`]
  (https://doc.rust-lang.org/stable/core/char/fn.from_digit.html)

Compatibility Notes
-------------------

- [The layout of `repr(Rust)` types now groups m\*2^n-sized fields
  with equivalently aligned ones.]
  (rust-lang/rust#102750) This is intended
  to be an optimization, but it is also known to increase type
  sizes in a few cases for the placement of enum tags. As a reminder,
  the layout of `repr(Rust)` types is an implementation detail,
  subject to change.
- [0.5 now rounds to 0 when formatted to 0 decimal places.]
  (rust-lang/rust#102935)
  This makes it consistent with the rest of floating point formatting that
  rounds ties toward even digits.
- [Chains of `&&` and `||` will now drop temporaries from their
  sub-expressions in evaluation order, left-to-right.]
  (rust-lang/rust#103293) Previously, it
  was "twisted" such that the _first_ expression dropped its
  temporaries _last_, after all of the other expressions dropped
  in order.
- [Underscore suffixes on string literals are now a hard error.]
  (rust-lang/rust#103914)
  This has been a future-compatibility warning since 1.20.0.
- [Stop passing `-export-dynamic` to `wasm-ld`.]
  (rust-lang/rust#105405)
- [`main` is now mangled as `__main_void` on `wasm32-wasi`.]
  (rust-lang/rust#105468)
- [Cargo now emits an error if there are multiple registries in
  the configuration with the same index URL.]
  (rust-lang/cargo#10592)

Internal Changes
----------------

These changes do not affect any public interfaces of Rust, but they
represent significant improvements to the performance or internals
of rustc and related tools.

- [Rewrite LLVM's archive writer in Rust.]
  (rust-lang/rust#97485)
@workingjubilee workingjubilee added the O-neutrino OS: QNX Neutrino, a POSIX-compatible real-time operating system label Feb 27, 2023
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Apr 8, 2023
Pkgsrc changes:
 * Adjust patches (add & remove) and cargo checksums to new versions.
 * It's conceivable that the workaround for LLVM based NetBSD works
   even less in this version (ref. PKGSRC_HAVE_LIBCPP not having a
   corresponding patch anymore).

Upstream changes:

Version 1.68.2 (2023-03-28)
===========================

- [Update the GitHub RSA host key bundled within Cargo]
  (rust-lang/cargo#11883).
  The key was [rotated by GitHub]
  (https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/)
  on 2023-03-24 after the old one leaked.
- [Mark the old GitHub RSA host key as revoked]
  (rust-lang/cargo#11889).
  This will prevent Cargo from accepting the leaked key even when
  trusted by the system.
- [Add support for `@revoked` and a better error message for
  `@cert-authority` in Cargo's SSH host key verification]
  (rust-lang/cargo#11635)

Version 1.68.1 (2023-03-23)
===========================

- [Fix miscompilation in produced Windows MSVC artifacts]
  (rust-lang/rust#109094)
  This was introduced by enabling ThinLTO for the distributed rustc
  which led to miscompilations in the resulting binary. Currently
  this is believed to be limited to the -Zdylib-lto flag used for
  rustc compilation, rather than a general bug in ThinLTO, so only
  rustc artifacts should be affected.
- [Fix --enable-local-rust builds]
  (rust-lang/rust#109111)
- [Treat `$prefix-clang` as `clang` in linker detection code]
  (rust-lang/rust#109156)
- [Fix panic in compiler code]
  (rust-lang/rust#108162)

Version 1.68.0 (2023-03-09)
===========================

Language
--------

- [Stabilize default_alloc_error_handler]
  (rust-lang/rust#102318)
  This allows usage of `alloc` on stable without requiring the
  definition of a handler for allocation failure. Defining custom
  handlers is still unstable.
- [Stabilize `efiapi` calling convention.]
  (rust-lang/rust#105795)
- [Remove implicit promotion for types with drop glue]
  (rust-lang/rust#105085)

Compiler
--------

- [Change `bindings_with_variant_name` to deny-by-default]
  (rust-lang/rust#104154)
- [Allow .. to be parsed as let initializer]
  (rust-lang/rust#105701)
- [Add `armv7-sony-vita-newlibeabihf` as a tier 3 target]
  (rust-lang/rust#105712)
- [Always check alignment during compile-time const evaluation]
  (rust-lang/rust#104616)
- [Disable "split dwarf inlining" by default.]
  (rust-lang/rust#106709)
- [Add vendor to Fuchsia's target triple]
  (rust-lang/rust#106429)
- [Enable sanitizers for s390x-linux]
  (rust-lang/rust#107127)

Libraries
---------

- [Loosen the bound on the Debug implementation of Weak.]
  (rust-lang/rust#90291)
- [Make `std::task::Context` !Send and !Sync]
  (rust-lang/rust#95985)
- [PhantomData layout guarantees]
  (rust-lang/rust#104081)
- [Don't derive Debug for `OnceWith` & `RepeatWith`]
  (rust-lang/rust#104163)
- [Implement DerefMut for PathBuf]
  (rust-lang/rust#105018)
- [Add O(1) `Vec -> VecDeque` conversion guarantee]
  (rust-lang/rust#105128)
- [Leak amplification for peek_mut() to ensure BinaryHeap's invariant
  is always met]
  (rust-lang/rust#105851)

Stabilized APIs
---------------

- [`{core,std}::pin::pin!`]
  (https://doc.rust-lang.org/stable/std/pin/macro.pin.html)
- [`impl From<bool> for {f32,f64}`]
  (https://doc.rust-lang.org/stable/std/primitive.f32.html#impl-From-for-f32)
- [`std::path::MAIN_SEPARATOR_STR`]
  (https://doc.rust-lang.org/stable/std/path/constant.MAIN_SEPARATOR_STR.html)
- [`impl DerefMut for PathBuf`]
  (https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#impl-DerefMut-for-PathBuf)

These APIs are now stable in const contexts:

- [`VecDeque::new`]
  (https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.new)

Cargo
-----

- [Stabilize sparse registry support for crates.io]
  (rust-lang/cargo#11224)
- [`cargo build --verbose` tells you more about why it recompiles.]
  (rust-lang/cargo#11407)
- [Show progress of crates.io index update even `net.git-fetch-with-cli`
  option enabled]
  (rust-lang/cargo#11579)

Misc
----

Compatibility Notes
-------------------

- [Add `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` to future-incompat report]
  (rust-lang/rust#103418)
- [Only specify `--target` by default for `-Zgcc-ld=lld` on wasm]
  (rust-lang/rust#101792)
- [Bump `IMPLIED_BOUNDS_ENTAILMENT` to Deny   ReportNow]
  (rust-lang/rust#106465)
- [`std::task::Context` no longer implements Send and Sync]
  (rust-lang/rust#95985)

nternal Changes
----------------

These changes do not affect any public interfaces of Rust, but they represent
significant improvements to the performance or internals of rustc and related
tools.

- [Encode spans relative to the enclosing item]
  (rust-lang/rust#84762)
- [Don't normalize in AstConv]
  (rust-lang/rust#101947)
- [Find the right lower bound region in the scenario of partial order relations]
  (rust-lang/rust#104765)
- [Fix impl block in const expr]
  (rust-lang/rust#104889)
- [Check ADT fields for copy implementations considering regions]
  (rust-lang/rust#105102)
- [rustdoc: simplify JS search routine by not messing with lev distance]
  (rust-lang/rust#105796)
- [Enable ThinLTO for rustc on `x86_64-pc-windows-msvc`]
  (rust-lang/rust#103591)
- [Enable ThinLTO for rustc on `x86_64-apple-darwin`]
  (rust-lang/rust#103647)

Version 1.67.0 (2023-01-26)
==========================

Language
--------

- [Make `Sized` predicates coinductive, allowing cycles.]
  (rust-lang/rust#100386)
- [`#[must_use]` annotations on `async fn` also affect the
  `Future::Output`.] (rust-lang/rust#100633)
- [Elaborate supertrait obligations when deducing closure signatures.]
  (rust-lang/rust#101834)
- [Invalid literals are no longer an error under `cfg(FALSE)`.]
  (rust-lang/rust#102944)
- [Unreserve braced enum variants in value namespace.]
  (rust-lang/rust#103578)

Compiler
--------

- [Enable varargs support for calling conventions other than `C`
  or `cdecl`.] (rust-lang/rust#97971)
- [Add new MIR constant propagation based on dataflow analysis.]
  (rust-lang/rust#101168)
- [Optimize field ordering by grouping m\*2^n-sized fields with
  equivalently aligned ones.] (rust-lang/rust#102750)
- [Stabilize native library modifier `verbatim`.]
  (rust-lang/rust#104360)

Added and removed targets:

- [Add a tier 3 target for PowerPC on AIX]
  (rust-lang/rust#102293), `powerpc64-ibm-aix`.
- [Add a tier 3 target for the Sony PlayStation 1]
  (rust-lang/rust#102689), `mipsel-sony-psx`.
- [Add tier 3 `no_std` targets for the QNX Neutrino RTOS]
  (rust-lang/rust#102701),
  `aarch64-unknown-nto-qnx710` and `x86_64-pc-nto-qnx710`.
- [Remove tier 3 `linuxkernel` targets]
  (rust-lang/rust#104015) (not used by the
  actual kernel).

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

Libraries
---------

- [Merge `crossbeam-channel` into `std::sync::mpsc`.]
  (rust-lang/rust#93563)
- [Fix inconsistent rounding of 0.5 when formatted to 0 decimal places.]
  (rust-lang/rust#102935)
- [Derive `Eq` and `Hash` for `ControlFlow`.]
  (rust-lang/rust#103084)
- [Don't build `compiler_builtins` with `-C panic=abort`.]
  (rust-lang/rust#103786)

Stabilized APIs
---------------

- [`{integer}::checked_ilog`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog)
- [`{integer}::checked_ilog2`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog2)
- [`{integer}::checked_ilog10`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.checked_ilog10)
- [`{integer}::ilog`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog)
- [`{integer}::ilog2`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog2)
- [`{integer}::ilog10`]
  (https://doc.rust-lang.org/stable/std/primitive.i32.html#method.ilog10)
- [`NonZeroU*::ilog2`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog2)
- [`NonZeroU*::ilog10`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#method.ilog10)
- [`NonZero*::BITS`]
  (https://doc.rust-lang.org/stable/std/num/struct.NonZeroU32.html#associatedconstant.BITS)

These APIs are now stable in const contexts:

- [`char::from_u32`]
  (https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_u32)
- [`char::from_digit`]
  (https://doc.rust-lang.org/stable/std/primitive.char.html#method.from_digit)
- [`char::to_digit`]
  (https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_digit)
- [`core::char::from_u32`]
  (https://doc.rust-lang.org/stable/core/char/fn.from_u32.html)
- [`core::char::from_digit`]
  (https://doc.rust-lang.org/stable/core/char/fn.from_digit.html)

Compatibility Notes
-------------------

- [The layout of `repr(Rust)` types now groups m\*2^n-sized fields
  with equivalently aligned ones.]
  (rust-lang/rust#102750) This is intended
  to be an optimization, but it is also known to increase type
  sizes in a few cases for the placement of enum tags. As a reminder,
  the layout of `repr(Rust)` types is an implementation detail,
  subject to change.
- [0.5 now rounds to 0 when formatted to 0 decimal places.]
  (rust-lang/rust#102935)
  This makes it consistent with the rest of floating point formatting that
  rounds ties toward even digits.
- [Chains of `&&` and `||` will now drop temporaries from their
  sub-expressions in evaluation order, left-to-right.]
  (rust-lang/rust#103293) Previously, it
  was "twisted" such that the _first_ expression dropped its
  temporaries _last_, after all of the other expressions dropped
  in order.
- [Underscore suffixes on string literals are now a hard error.]
  (rust-lang/rust#103914)
  This has been a future-compatibility warning since 1.20.0.
- [Stop passing `-export-dynamic` to `wasm-ld`.]
  (rust-lang/rust#105405)
- [`main` is now mangled as `__main_void` on `wasm32-wasi`.]
  (rust-lang/rust#105468)
- [Cargo now emits an error if there are multiple registries in
  the configuration with the same index URL.]
  (rust-lang/cargo#10592)

Internal Changes
----------------

These changes do not affect any public interfaces of Rust, but they
represent significant improvements to the performance or internals
of rustc and related tools.

- [Rewrite LLVM's archive writer in Rust.]
  (rust-lang/rust#97485)
bors added a commit to rust-lang-ci/rust that referenced this pull request Apr 9, 2023
…piler-errors

Add tier 3 no_std x86 support for QNX Neutrino RTOS, version 7.0

This PR adds the target `i586-pc-nto-qnx700`, which targets QNX Neutrino RTOS version 7.0 on x86 32-bit targets.

cc: `@flba-eb` `@gh-tr`

This target falls under the umbrella of Tier 3 QNX Neutrino RTOS support documented in `nto-qnx.md` and previously started with rust-lang#102701.
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
A-meta Area: Issues & PRs about the rust-lang/rust repository itself merged-by-bors This PR was explicitly merged by bors. O-neutrino OS: QNX Neutrino, a POSIX-compatible real-time operating system S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
Projects
None yet
Development

Successfully merging this pull request may close these issues.