Emit thumb code on VEX V5 by lewisfm · Pull Request #158762 · rust-lang/rust

lewisfm · 2026-07-04T04:45:45Z

This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the thumb prefix instead of the arm prefix because of the updated instruction set.

Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling _start.

Users can still use the updated target in Arm32 mode by specifying -Ctarget-feature=-thumb-mode.

cc @tropicaaal @Gavin-Niederman

rustbot · 2026-07-04T04:45:48Z

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

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

rustbot · 2026-07-04T04:45:50Z

r? @Kivooeo

rustbot has assigned @Kivooeo.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

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Owners of files modified in this PR: @ehuss, compiler
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Random selection from 23 candidates

rust-log-analyzer · 2026-07-04T05:05:41Z

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

 PR_CI_JOB: 1
IMAGE: x86_64-gnu-llvm-21
##[endgroup]
Updating crates.io index
error: failed to get `fnv` as a dependency of package `http v1.2.0`
... which satisfies dependency `http = "^1.1.0"` of package `ureq-proto v0.3.3`
... which satisfies dependency `ureq-proto = "^0.3.3"` of package `ureq v3.0.8`
... which satisfies dependency `ureq = "^3"` of package `citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)`
Caused by:
failed to load source for dependency `fnv`
Caused by:
unable to update registry `crates-io`
Caused by:
download of 3/f/fnv failed
Caused by:
curl failed
Caused by:

Gavin-Niederman

LGTM

View changes since this review

tropicaaal · 2026-07-11T15:29:36Z


 **Tier: 3**

 Allows compiling user programs for the [VEX V5 Brain](https://www.vexrobotics.com/276-4810.html), a microcontroller for educational and competitive robotics.

 Rust support for this target is not affiliated with VEX Robotics or IFI, and does not link against any official VEX SDK.

+This target was previously named `armv7a-vex-v5`.


Not a blocker, but it might be a good idea for this to be elaborated on wrt. why we changed to thumb.
View changes since the review

tropicaaal

LGTM

View changes since this review

Kivooeo · 2026-08-05T02:44:11Z

@rustbot reroll (don't know anything about this targets and don't have bandwidth to figure it out)

rustbot · 2026-08-05T09:58:17Z

⚠️Warning⚠️

This PR is based on an upstream commit that is older than 28 days.
It's recommended to update your branch according to the rustc-dev-guide.

jieyouxu

Thanks. Given that this is a Tier 3 target and target maintainers are on board I'm happy to stamp this.

@bors r+ rollup

View changes since this review

rust-bors · 2026-08-05T09:59:15Z

📌 Commit 383d557 has been approved by jieyouxu

It is now in the queue for this repository.

@tropicaaal

Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - #154585 (treat no_mangle_generic_items as hard error instead of lint warning) - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe my unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

…uwer Rollup of 25 pull requests Successful merges: - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160501 (Add bootstrap CLI snapshot test for testing miri) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

@tropicaaal

Rollup merge of #158762 - vexide:feat/vex-v5-thumb2, r=jieyouxu Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#158147 (std: fix stack buffer overflow in Windows junction_point) - rust-lang/rust#160130 (Select cache values to verify by key fingerprint, not value fingerprint) - rust-lang/rust#160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - rust-lang/rust#160360 (Remove rustc_middle dependency on rustc_hir_pretty) - rust-lang/rust#160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - rust-lang/rust#160422 (move mir-opt miri tests to CI logic) - rust-lang/rust#160444 (Avoid resolving path keywords outside `TypeNS`) - rust-lang/rust#160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - rust-lang/rust#155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - rust-lang/rust#158726 (std: move futex implementations into sys::sync::futex) - rust-lang/rust#158762 (Emit thumb code on VEX V5) - rust-lang/rust#159225 (Split IncrCompSession out of Session) - rust-lang/rust#159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - rust-lang/rust#160198 (Rework `smallest_range_containing` to handle duplicates) - rust-lang/rust#160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - rust-lang/rust#160390 (autodiff: Handle slice-tailed DSTs in type trees) - rust-lang/rust#160420 (Suggest `cast_signed()` for overflowing signed integer literals) - rust-lang/rust#160501 (Add bootstrap CLI snapshot test for testing miri) - rust-lang/rust#160516 (Add regression test for HRTB projection in closure) - rust-lang/rust#160520 (Add some tests for specialization) - rust-lang/rust#160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - rust-lang/rust#160523 (Add regression test for opaque type) - rust-lang/rust#160531 (docs: fix typo in AllowExprMetavar comment) - rust-lang/rust#160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - rust-lang/rust#160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

lewisfm · 2026-07-04T04:45:45Z

This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the thumb prefix instead of the arm prefix because of the updated instruction set.

Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling _start.

Users can still use the updated target in Arm32 mode by specifying -Ctarget-feature=-thumb-mode.

cc @tropicaaal @Gavin-Niederman

rustbot · 2026-07-04T04:45:48Z

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

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

rustbot · 2026-07-04T04:45:50Z

r? @Kivooeo

rustbot has assigned @Kivooeo.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: @ehuss, compiler
@ehuss, compiler expanded to 76 candidates
Random selection from 23 candidates

rust-log-analyzer · 2026-07-04T05:05:41Z

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

 PR_CI_JOB: 1
IMAGE: x86_64-gnu-llvm-21
##[endgroup]
Updating crates.io index
error: failed to get `fnv` as a dependency of package `http v1.2.0`
... which satisfies dependency `http = "^1.1.0"` of package `ureq-proto v0.3.3`
... which satisfies dependency `ureq-proto = "^0.3.3"` of package `ureq v3.0.8`
... which satisfies dependency `ureq = "^3"` of package `citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)`
Caused by:
failed to load source for dependency `fnv`
Caused by:
unable to update registry `crates-io`
Caused by:
download of 3/f/fnv failed
Caused by:
curl failed
Caused by:

Gavin-Niederman

LGTM

View changes since this review

tropicaaal · 2026-07-11T15:29:36Z


 **Tier: 3**

 Allows compiling user programs for the [VEX V5 Brain](https://www.vexrobotics.com/276-4810.html), a microcontroller for educational and competitive robotics.

 Rust support for this target is not affiliated with VEX Robotics or IFI, and does not link against any official VEX SDK.

+This target was previously named `armv7a-vex-v5`.


Not a blocker, but it might be a good idea for this to be elaborated on wrt. why we changed to thumb.
View changes since the review

tropicaaal

LGTM

View changes since this review

Kivooeo · 2026-08-05T02:44:11Z

@rustbot reroll (don't know anything about this targets and don't have bandwidth to figure it out)

rustbot · 2026-08-05T09:58:17Z

⚠️Warning⚠️

This PR is based on an upstream commit that is older than 28 days.
It's recommended to update your branch according to the rustc-dev-guide.

jieyouxu

Thanks. Given that this is a Tier 3 target and target maintainers are on board I'm happy to stamp this.

@bors r+ rollup

View changes since this review

rust-bors · 2026-08-05T09:59:15Z

📌 Commit 383d557 has been approved by jieyouxu

It is now in the queue for this repository.

@tropicaaal

Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - #154585 (treat no_mangle_generic_items as hard error instead of lint warning) - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe my unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

…uwer Rollup of 25 pull requests Successful merges: - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160501 (Add bootstrap CLI snapshot test for testing miri) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

@tropicaaal

Rollup merge of #158762 - vexide:feat/vex-v5-thumb2, r=jieyouxu Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#158147 (std: fix stack buffer overflow in Windows junction_point) - rust-lang/rust#160130 (Select cache values to verify by key fingerprint, not value fingerprint) - rust-lang/rust#160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - rust-lang/rust#160360 (Remove rustc_middle dependency on rustc_hir_pretty) - rust-lang/rust#160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - rust-lang/rust#160422 (move mir-opt miri tests to CI logic) - rust-lang/rust#160444 (Avoid resolving path keywords outside `TypeNS`) - rust-lang/rust#160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - rust-lang/rust#155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - rust-lang/rust#158726 (std: move futex implementations into sys::sync::futex) - rust-lang/rust#158762 (Emit thumb code on VEX V5) - rust-lang/rust#159225 (Split IncrCompSession out of Session) - rust-lang/rust#159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - rust-lang/rust#160198 (Rework `smallest_range_containing` to handle duplicates) - rust-lang/rust#160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - rust-lang/rust#160390 (autodiff: Handle slice-tailed DSTs in type trees) - rust-lang/rust#160420 (Suggest `cast_signed()` for overflowing signed integer literals) - rust-lang/rust#160501 (Add bootstrap CLI snapshot test for testing miri) - rust-lang/rust#160516 (Add regression test for HRTB projection in closure) - rust-lang/rust#160520 (Add some tests for specialization) - rust-lang/rust#160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - rust-lang/rust#160523 (Add regression test for opaque type) - rust-lang/rust#160531 (docs: fix typo in AllowExprMetavar comment) - rust-lang/rust#160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - rust-lang/rust#160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

lewisfm · 2026-07-04T04:45:45Z

This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the thumb prefix instead of the arm prefix because of the updated instruction set.

Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling _start.

Users can still use the updated target in Arm32 mode by specifying -Ctarget-feature=-thumb-mode.

cc @tropicaaal @Gavin-Niederman

rustbot · 2026-07-04T04:45:48Z

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

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

rustbot · 2026-07-04T04:45:50Z

r? @Kivooeo

rustbot has assigned @Kivooeo.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: @ehuss, compiler
@ehuss, compiler expanded to 76 candidates
Random selection from 23 candidates

rust-log-analyzer · 2026-07-04T05:05:41Z

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

 PR_CI_JOB: 1
IMAGE: x86_64-gnu-llvm-21
##[endgroup]
Updating crates.io index
error: failed to get `fnv` as a dependency of package `http v1.2.0`
... which satisfies dependency `http = "^1.1.0"` of package `ureq-proto v0.3.3`
... which satisfies dependency `ureq-proto = "^0.3.3"` of package `ureq v3.0.8`
... which satisfies dependency `ureq = "^3"` of package `citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)`
Caused by:
failed to load source for dependency `fnv`
Caused by:
unable to update registry `crates-io`
Caused by:
download of 3/f/fnv failed
Caused by:
curl failed
Caused by:

Gavin-Niederman

LGTM

View changes since this review

tropicaaal · 2026-07-11T15:29:36Z


 **Tier: 3**

 Allows compiling user programs for the [VEX V5 Brain](https://www.vexrobotics.com/276-4810.html), a microcontroller for educational and competitive robotics.

 Rust support for this target is not affiliated with VEX Robotics or IFI, and does not link against any official VEX SDK.

+This target was previously named `armv7a-vex-v5`.


Not a blocker, but it might be a good idea for this to be elaborated on wrt. why we changed to thumb.
View changes since the review

tropicaaal

LGTM

View changes since this review

Kivooeo · 2026-08-05T02:44:11Z

@rustbot reroll (don't know anything about this targets and don't have bandwidth to figure it out)

rustbot · 2026-08-05T09:58:17Z

⚠️Warning⚠️

This PR is based on an upstream commit that is older than 28 days.
It's recommended to update your branch according to the rustc-dev-guide.

jieyouxu

Thanks. Given that this is a Tier 3 target and target maintainers are on board I'm happy to stamp this.

@bors r+ rollup

View changes since this review

rust-bors · 2026-08-05T09:59:15Z

📌 Commit 383d557 has been approved by jieyouxu

It is now in the queue for this repository.

@tropicaaal

Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - #154585 (treat no_mangle_generic_items as hard error instead of lint warning) - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe my unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

…uwer Rollup of 25 pull requests Successful merges: - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160501 (Add bootstrap CLI snapshot test for testing miri) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

@tropicaaal

Rollup merge of #158762 - vexide:feat/vex-v5-thumb2, r=jieyouxu Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#158147 (std: fix stack buffer overflow in Windows junction_point) - rust-lang/rust#160130 (Select cache values to verify by key fingerprint, not value fingerprint) - rust-lang/rust#160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - rust-lang/rust#160360 (Remove rustc_middle dependency on rustc_hir_pretty) - rust-lang/rust#160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - rust-lang/rust#160422 (move mir-opt miri tests to CI logic) - rust-lang/rust#160444 (Avoid resolving path keywords outside `TypeNS`) - rust-lang/rust#160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - rust-lang/rust#155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - rust-lang/rust#158726 (std: move futex implementations into sys::sync::futex) - rust-lang/rust#158762 (Emit thumb code on VEX V5) - rust-lang/rust#159225 (Split IncrCompSession out of Session) - rust-lang/rust#159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - rust-lang/rust#160198 (Rework `smallest_range_containing` to handle duplicates) - rust-lang/rust#160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - rust-lang/rust#160390 (autodiff: Handle slice-tailed DSTs in type trees) - rust-lang/rust#160420 (Suggest `cast_signed()` for overflowing signed integer literals) - rust-lang/rust#160501 (Add bootstrap CLI snapshot test for testing miri) - rust-lang/rust#160516 (Add regression test for HRTB projection in closure) - rust-lang/rust#160520 (Add some tests for specialization) - rust-lang/rust#160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - rust-lang/rust#160523 (Add regression test for opaque type) - rust-lang/rust#160531 (docs: fix typo in AllowExprMetavar comment) - rust-lang/rust#160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - rust-lang/rust#160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

lewisfm · 2026-07-04T04:45:45Z

This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the thumb prefix instead of the arm prefix because of the updated instruction set.

Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling _start.

Users can still use the updated target in Arm32 mode by specifying -Ctarget-feature=-thumb-mode.

cc @tropicaaal @Gavin-Niederman

rustbot · 2026-07-04T04:45:48Z

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

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

rustbot · 2026-07-04T04:45:50Z

r? @Kivooeo

rustbot has assigned @Kivooeo.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: @ehuss, compiler
@ehuss, compiler expanded to 76 candidates
Random selection from 23 candidates

rust-log-analyzer · 2026-07-04T05:05:41Z

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

 PR_CI_JOB: 1
IMAGE: x86_64-gnu-llvm-21
##[endgroup]
Updating crates.io index
error: failed to get `fnv` as a dependency of package `http v1.2.0`
... which satisfies dependency `http = "^1.1.0"` of package `ureq-proto v0.3.3`
... which satisfies dependency `ureq-proto = "^0.3.3"` of package `ureq v3.0.8`
... which satisfies dependency `ureq = "^3"` of package `citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)`
Caused by:
failed to load source for dependency `fnv`
Caused by:
unable to update registry `crates-io`
Caused by:
download of 3/f/fnv failed
Caused by:
curl failed
Caused by:

Gavin-Niederman

LGTM

View changes since this review

tropicaaal · 2026-07-11T15:29:36Z


 **Tier: 3**

 Allows compiling user programs for the [VEX V5 Brain](https://www.vexrobotics.com/276-4810.html), a microcontroller for educational and competitive robotics.

 Rust support for this target is not affiliated with VEX Robotics or IFI, and does not link against any official VEX SDK.

+This target was previously named `armv7a-vex-v5`.


Not a blocker, but it might be a good idea for this to be elaborated on wrt. why we changed to thumb.
View changes since the review

tropicaaal

LGTM

View changes since this review

Kivooeo · 2026-08-05T02:44:11Z

@rustbot reroll (don't know anything about this targets and don't have bandwidth to figure it out)

rustbot · 2026-08-05T09:58:17Z

⚠️Warning⚠️

This PR is based on an upstream commit that is older than 28 days.
It's recommended to update your branch according to the rustc-dev-guide.

jieyouxu

Thanks. Given that this is a Tier 3 target and target maintainers are on board I'm happy to stamp this.

@bors r+ rollup

View changes since this review

rust-bors · 2026-08-05T09:59:15Z

📌 Commit 383d557 has been approved by jieyouxu

It is now in the queue for this repository.

@tropicaaal

Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - #154585 (treat no_mangle_generic_items as hard error instead of lint warning) - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe my unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

…uwer Rollup of 25 pull requests Successful merges: - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160501 (Add bootstrap CLI snapshot test for testing miri) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

@tropicaaal

Rollup merge of #158762 - vexide:feat/vex-v5-thumb2, r=jieyouxu Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#158147 (std: fix stack buffer overflow in Windows junction_point) - rust-lang/rust#160130 (Select cache values to verify by key fingerprint, not value fingerprint) - rust-lang/rust#160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - rust-lang/rust#160360 (Remove rustc_middle dependency on rustc_hir_pretty) - rust-lang/rust#160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - rust-lang/rust#160422 (move mir-opt miri tests to CI logic) - rust-lang/rust#160444 (Avoid resolving path keywords outside `TypeNS`) - rust-lang/rust#160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - rust-lang/rust#155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - rust-lang/rust#158726 (std: move futex implementations into sys::sync::futex) - rust-lang/rust#158762 (Emit thumb code on VEX V5) - rust-lang/rust#159225 (Split IncrCompSession out of Session) - rust-lang/rust#159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - rust-lang/rust#160198 (Rework `smallest_range_containing` to handle duplicates) - rust-lang/rust#160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - rust-lang/rust#160390 (autodiff: Handle slice-tailed DSTs in type trees) - rust-lang/rust#160420 (Suggest `cast_signed()` for overflowing signed integer literals) - rust-lang/rust#160501 (Add bootstrap CLI snapshot test for testing miri) - rust-lang/rust#160516 (Add regression test for HRTB projection in closure) - rust-lang/rust#160520 (Add some tests for specialization) - rust-lang/rust#160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - rust-lang/rust#160523 (Add regression test for opaque type) - rust-lang/rust#160531 (docs: fix typo in AllowExprMetavar comment) - rust-lang/rust#160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - rust-lang/rust#160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

lewisfm · 2026-07-04T04:45:45Z

This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the thumb prefix instead of the arm prefix because of the updated instruction set.

Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling _start.

Users can still use the updated target in Arm32 mode by specifying -Ctarget-feature=-thumb-mode.

cc @tropicaaal @Gavin-Niederman

rustbot · 2026-07-04T04:45:48Z

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

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

rustbot · 2026-07-04T04:45:50Z

r? @Kivooeo

rustbot has assigned @Kivooeo.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: @ehuss, compiler
@ehuss, compiler expanded to 76 candidates
Random selection from 23 candidates

rust-log-analyzer · 2026-07-04T05:05:41Z

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

 PR_CI_JOB: 1
IMAGE: x86_64-gnu-llvm-21
##[endgroup]
Updating crates.io index
error: failed to get `fnv` as a dependency of package `http v1.2.0`
... which satisfies dependency `http = "^1.1.0"` of package `ureq-proto v0.3.3`
... which satisfies dependency `ureq-proto = "^0.3.3"` of package `ureq v3.0.8`
... which satisfies dependency `ureq = "^3"` of package `citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)`
Caused by:
failed to load source for dependency `fnv`
Caused by:
unable to update registry `crates-io`
Caused by:
download of 3/f/fnv failed
Caused by:
curl failed
Caused by:

Gavin-Niederman

LGTM

View changes since this review

tropicaaal · 2026-07-11T15:29:36Z


 **Tier: 3**

 Allows compiling user programs for the [VEX V5 Brain](https://www.vexrobotics.com/276-4810.html), a microcontroller for educational and competitive robotics.

 Rust support for this target is not affiliated with VEX Robotics or IFI, and does not link against any official VEX SDK.

+This target was previously named `armv7a-vex-v5`.


Not a blocker, but it might be a good idea for this to be elaborated on wrt. why we changed to thumb.
View changes since the review

tropicaaal

LGTM

View changes since this review

Kivooeo · 2026-08-05T02:44:11Z

@rustbot reroll (don't know anything about this targets and don't have bandwidth to figure it out)

rustbot · 2026-08-05T09:58:17Z

⚠️Warning⚠️

This PR is based on an upstream commit that is older than 28 days.
It's recommended to update your branch according to the rustc-dev-guide.

jieyouxu

Thanks. Given that this is a Tier 3 target and target maintainers are on board I'm happy to stamp this.

@bors r+ rollup

View changes since this review

rust-bors · 2026-08-05T09:59:15Z

📌 Commit 383d557 has been approved by jieyouxu

It is now in the queue for this repository.

@tropicaaal

Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - #154585 (treat no_mangle_generic_items as hard error instead of lint warning) - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe my unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

…uwer Rollup of 25 pull requests Successful merges: - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160501 (Add bootstrap CLI snapshot test for testing miri) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

@tropicaaal

Rollup merge of #158762 - vexide:feat/vex-v5-thumb2, r=jieyouxu Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#158147 (std: fix stack buffer overflow in Windows junction_point) - rust-lang/rust#160130 (Select cache values to verify by key fingerprint, not value fingerprint) - rust-lang/rust#160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - rust-lang/rust#160360 (Remove rustc_middle dependency on rustc_hir_pretty) - rust-lang/rust#160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - rust-lang/rust#160422 (move mir-opt miri tests to CI logic) - rust-lang/rust#160444 (Avoid resolving path keywords outside `TypeNS`) - rust-lang/rust#160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - rust-lang/rust#155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - rust-lang/rust#158726 (std: move futex implementations into sys::sync::futex) - rust-lang/rust#158762 (Emit thumb code on VEX V5) - rust-lang/rust#159225 (Split IncrCompSession out of Session) - rust-lang/rust#159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - rust-lang/rust#160198 (Rework `smallest_range_containing` to handle duplicates) - rust-lang/rust#160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - rust-lang/rust#160390 (autodiff: Handle slice-tailed DSTs in type trees) - rust-lang/rust#160420 (Suggest `cast_signed()` for overflowing signed integer literals) - rust-lang/rust#160501 (Add bootstrap CLI snapshot test for testing miri) - rust-lang/rust#160516 (Add regression test for HRTB projection in closure) - rust-lang/rust#160520 (Add some tests for specialization) - rust-lang/rust#160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - rust-lang/rust#160523 (Add regression test for opaque type) - rust-lang/rust#160531 (docs: fix typo in AllowExprMetavar comment) - rust-lang/rust#160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - rust-lang/rust#160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

lewisfm · 2026-07-04T04:45:45Z

This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the thumb prefix instead of the arm prefix because of the updated instruction set.

Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling _start.

Users can still use the updated target in Arm32 mode by specifying -Ctarget-feature=-thumb-mode.

cc @tropicaaal @Gavin-Niederman

rustbot · 2026-07-04T04:45:48Z

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

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

rustbot · 2026-07-04T04:45:50Z

r? @Kivooeo

rustbot has assigned @Kivooeo.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: @ehuss, compiler
@ehuss, compiler expanded to 76 candidates
Random selection from 23 candidates

rust-log-analyzer · 2026-07-04T05:05:41Z

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

 PR_CI_JOB: 1
IMAGE: x86_64-gnu-llvm-21
##[endgroup]
Updating crates.io index
error: failed to get `fnv` as a dependency of package `http v1.2.0`
... which satisfies dependency `http = "^1.1.0"` of package `ureq-proto v0.3.3`
... which satisfies dependency `ureq-proto = "^0.3.3"` of package `ureq v3.0.8`
... which satisfies dependency `ureq = "^3"` of package `citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)`
Caused by:
failed to load source for dependency `fnv`
Caused by:
unable to update registry `crates-io`
Caused by:
download of 3/f/fnv failed
Caused by:
curl failed
Caused by:

Gavin-Niederman

LGTM

View changes since this review

tropicaaal · 2026-07-11T15:29:36Z


 **Tier: 3**

 Allows compiling user programs for the [VEX V5 Brain](https://www.vexrobotics.com/276-4810.html), a microcontroller for educational and competitive robotics.

 Rust support for this target is not affiliated with VEX Robotics or IFI, and does not link against any official VEX SDK.

+This target was previously named `armv7a-vex-v5`.


Not a blocker, but it might be a good idea for this to be elaborated on wrt. why we changed to thumb.
View changes since the review

tropicaaal

LGTM

View changes since this review

Kivooeo · 2026-08-05T02:44:11Z

@rustbot reroll (don't know anything about this targets and don't have bandwidth to figure it out)

rustbot · 2026-08-05T09:58:17Z

⚠️Warning⚠️

This PR is based on an upstream commit that is older than 28 days.
It's recommended to update your branch according to the rustc-dev-guide.

jieyouxu

Thanks. Given that this is a Tier 3 target and target maintainers are on board I'm happy to stamp this.

@bors r+ rollup

View changes since this review

rust-bors · 2026-08-05T09:59:15Z

📌 Commit 383d557 has been approved by jieyouxu

It is now in the queue for this repository.

@tropicaaal

Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - #154585 (treat no_mangle_generic_items as hard error instead of lint warning) - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe my unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

…uwer Rollup of 25 pull requests Successful merges: - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160501 (Add bootstrap CLI snapshot test for testing miri) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

@tropicaaal

Rollup merge of #158762 - vexide:feat/vex-v5-thumb2, r=jieyouxu Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#158147 (std: fix stack buffer overflow in Windows junction_point) - rust-lang/rust#160130 (Select cache values to verify by key fingerprint, not value fingerprint) - rust-lang/rust#160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - rust-lang/rust#160360 (Remove rustc_middle dependency on rustc_hir_pretty) - rust-lang/rust#160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - rust-lang/rust#160422 (move mir-opt miri tests to CI logic) - rust-lang/rust#160444 (Avoid resolving path keywords outside `TypeNS`) - rust-lang/rust#160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - rust-lang/rust#155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - rust-lang/rust#158726 (std: move futex implementations into sys::sync::futex) - rust-lang/rust#158762 (Emit thumb code on VEX V5) - rust-lang/rust#159225 (Split IncrCompSession out of Session) - rust-lang/rust#159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - rust-lang/rust#160198 (Rework `smallest_range_containing` to handle duplicates) - rust-lang/rust#160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - rust-lang/rust#160390 (autodiff: Handle slice-tailed DSTs in type trees) - rust-lang/rust#160420 (Suggest `cast_signed()` for overflowing signed integer literals) - rust-lang/rust#160501 (Add bootstrap CLI snapshot test for testing miri) - rust-lang/rust#160516 (Add regression test for HRTB projection in closure) - rust-lang/rust#160520 (Add some tests for specialization) - rust-lang/rust#160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - rust-lang/rust#160523 (Add regression test for opaque type) - rust-lang/rust#160531 (docs: fix typo in AllowExprMetavar comment) - rust-lang/rust#160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - rust-lang/rust#160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

lewisfm · 2026-07-04T04:45:45Z

This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the thumb prefix instead of the arm prefix because of the updated instruction set.

Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling _start.

Users can still use the updated target in Arm32 mode by specifying -Ctarget-feature=-thumb-mode.

cc @tropicaaal @Gavin-Niederman

rustbot · 2026-07-04T04:45:48Z

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

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

rustbot · 2026-07-04T04:45:50Z

r? @Kivooeo

rustbot has assigned @Kivooeo.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: @ehuss, compiler
@ehuss, compiler expanded to 76 candidates
Random selection from 23 candidates

rust-log-analyzer · 2026-07-04T05:05:41Z

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

 PR_CI_JOB: 1
IMAGE: x86_64-gnu-llvm-21
##[endgroup]
Updating crates.io index
error: failed to get `fnv` as a dependency of package `http v1.2.0`
... which satisfies dependency `http = "^1.1.0"` of package `ureq-proto v0.3.3`
... which satisfies dependency `ureq-proto = "^0.3.3"` of package `ureq v3.0.8`
... which satisfies dependency `ureq = "^3"` of package `citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)`
Caused by:
failed to load source for dependency `fnv`
Caused by:
unable to update registry `crates-io`
Caused by:
download of 3/f/fnv failed
Caused by:
curl failed
Caused by:

Gavin-Niederman

LGTM

View changes since this review

tropicaaal · 2026-07-11T15:29:36Z


 **Tier: 3**

 Allows compiling user programs for the [VEX V5 Brain](https://www.vexrobotics.com/276-4810.html), a microcontroller for educational and competitive robotics.

 Rust support for this target is not affiliated with VEX Robotics or IFI, and does not link against any official VEX SDK.

+This target was previously named `armv7a-vex-v5`.


Not a blocker, but it might be a good idea for this to be elaborated on wrt. why we changed to thumb.
View changes since the review

tropicaaal

LGTM

View changes since this review

Kivooeo · 2026-08-05T02:44:11Z

@rustbot reroll (don't know anything about this targets and don't have bandwidth to figure it out)

rustbot · 2026-08-05T09:58:17Z

⚠️Warning⚠️

This PR is based on an upstream commit that is older than 28 days.
It's recommended to update your branch according to the rustc-dev-guide.

jieyouxu

Thanks. Given that this is a Tier 3 target and target maintainers are on board I'm happy to stamp this.

@bors r+ rollup

View changes since this review

rust-bors · 2026-08-05T09:59:15Z

📌 Commit 383d557 has been approved by jieyouxu

It is now in the queue for this repository.

@tropicaaal

Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - #154585 (treat no_mangle_generic_items as hard error instead of lint warning) - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe my unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

…uwer Rollup of 25 pull requests Successful merges: - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160501 (Add bootstrap CLI snapshot test for testing miri) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

@tropicaaal

Rollup merge of #158762 - vexide:feat/vex-v5-thumb2, r=jieyouxu Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#158147 (std: fix stack buffer overflow in Windows junction_point) - rust-lang/rust#160130 (Select cache values to verify by key fingerprint, not value fingerprint) - rust-lang/rust#160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - rust-lang/rust#160360 (Remove rustc_middle dependency on rustc_hir_pretty) - rust-lang/rust#160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - rust-lang/rust#160422 (move mir-opt miri tests to CI logic) - rust-lang/rust#160444 (Avoid resolving path keywords outside `TypeNS`) - rust-lang/rust#160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - rust-lang/rust#155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - rust-lang/rust#158726 (std: move futex implementations into sys::sync::futex) - rust-lang/rust#158762 (Emit thumb code on VEX V5) - rust-lang/rust#159225 (Split IncrCompSession out of Session) - rust-lang/rust#159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - rust-lang/rust#160198 (Rework `smallest_range_containing` to handle duplicates) - rust-lang/rust#160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - rust-lang/rust#160390 (autodiff: Handle slice-tailed DSTs in type trees) - rust-lang/rust#160420 (Suggest `cast_signed()` for overflowing signed integer literals) - rust-lang/rust#160501 (Add bootstrap CLI snapshot test for testing miri) - rust-lang/rust#160516 (Add regression test for HRTB projection in closure) - rust-lang/rust#160520 (Add some tests for specialization) - rust-lang/rust#160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - rust-lang/rust#160523 (Add regression test for opaque type) - rust-lang/rust#160531 (docs: fix typo in AllowExprMetavar comment) - rust-lang/rust#160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - rust-lang/rust#160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

lewisfm · 2026-07-04T04:45:45Z

This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the thumb prefix instead of the arm prefix because of the updated instruction set.

Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling _start.

Users can still use the updated target in Arm32 mode by specifying -Ctarget-feature=-thumb-mode.

cc @tropicaaal @Gavin-Niederman

rustbot · 2026-07-04T04:45:48Z

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

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

rustbot · 2026-07-04T04:45:50Z

r? @Kivooeo

rustbot has assigned @Kivooeo.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: @ehuss, compiler
@ehuss, compiler expanded to 76 candidates
Random selection from 23 candidates

rust-log-analyzer · 2026-07-04T05:05:41Z

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

 PR_CI_JOB: 1
IMAGE: x86_64-gnu-llvm-21
##[endgroup]
Updating crates.io index
error: failed to get `fnv` as a dependency of package `http v1.2.0`
... which satisfies dependency `http = "^1.1.0"` of package `ureq-proto v0.3.3`
... which satisfies dependency `ureq-proto = "^0.3.3"` of package `ureq v3.0.8`
... which satisfies dependency `ureq = "^3"` of package `citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)`
Caused by:
failed to load source for dependency `fnv`
Caused by:
unable to update registry `crates-io`
Caused by:
download of 3/f/fnv failed
Caused by:
curl failed
Caused by:

Gavin-Niederman

LGTM

View changes since this review

tropicaaal · 2026-07-11T15:29:36Z


 **Tier: 3**

 Allows compiling user programs for the [VEX V5 Brain](https://www.vexrobotics.com/276-4810.html), a microcontroller for educational and competitive robotics.

 Rust support for this target is not affiliated with VEX Robotics or IFI, and does not link against any official VEX SDK.

+This target was previously named `armv7a-vex-v5`.


Not a blocker, but it might be a good idea for this to be elaborated on wrt. why we changed to thumb.
View changes since the review

tropicaaal

LGTM

View changes since this review

Kivooeo · 2026-08-05T02:44:11Z

@rustbot reroll (don't know anything about this targets and don't have bandwidth to figure it out)

rustbot · 2026-08-05T09:58:17Z

⚠️Warning⚠️

This PR is based on an upstream commit that is older than 28 days.
It's recommended to update your branch according to the rustc-dev-guide.

jieyouxu

Thanks. Given that this is a Tier 3 target and target maintainers are on board I'm happy to stamp this.

@bors r+ rollup

View changes since this review

rust-bors · 2026-08-05T09:59:15Z

📌 Commit 383d557 has been approved by jieyouxu

It is now in the queue for this repository.

@tropicaaal

Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - #154585 (treat no_mangle_generic_items as hard error instead of lint warning) - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe my unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

…uwer Rollup of 25 pull requests Successful merges: - #158147 (std: fix stack buffer overflow in Windows junction_point) - #160130 (Select cache values to verify by key fingerprint, not value fingerprint) - #160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - #160360 (Remove rustc_middle dependency on rustc_hir_pretty) - #160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - #160422 (move mir-opt miri tests to CI logic) - #160444 (Avoid resolving path keywords outside `TypeNS`) - #160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - #155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - #158726 (std: move futex implementations into sys::sync::futex) - #158762 (Emit thumb code on VEX V5) - #159225 (Split IncrCompSession out of Session) - #159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - #160198 (Rework `smallest_range_containing` to handle duplicates) - #160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - #160390 (autodiff: Handle slice-tailed DSTs in type trees) - #160420 (Suggest `cast_signed()` for overflowing signed integer literals) - #160501 (Add bootstrap CLI snapshot test for testing miri) - #160516 (Add regression test for HRTB projection in closure) - #160520 (Add some tests for specialization) - #160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - #160523 (Add regression test for opaque type) - #160531 (docs: fix typo in AllowExprMetavar comment) - #160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - #160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

@tropicaaal

Rollup merge of #158762 - vexide:feat/vex-v5-thumb2, r=jieyouxu Emit thumb code on VEX V5 This PR switches the default codegen for the VEX V5 target to emit Thumb-2 instructions, allowing for smaller binary sizes (on the programs I tested this change on, I saw a ~20% size decrease on average). The target is renamed to have the `thumb` prefix instead of the `arm` prefix because of the updated instruction set. Since VEXos starts all programs in Arm32 mode, the program entrypoint is explicitly compiled as ARM code and now transitions to Thumb mode when calling `_start`. Users can still use the updated target in Arm32 mode by specifying `-Ctarget-feature=-thumb-mode`. cc @tropicaaal @Gavin-Niederman

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#158147 (std: fix stack buffer overflow in Windows junction_point) - rust-lang/rust#160130 (Select cache values to verify by key fingerprint, not value fingerprint) - rust-lang/rust#160343 (Rename `OutlivesPredicate` to `OutlivesClause`) - rust-lang/rust#160360 (Remove rustc_middle dependency on rustc_hir_pretty) - rust-lang/rust#160387 (rustc_codegen_ssa: Correctly apply the static `--jobs-backend` limit to backend parallelism) - rust-lang/rust#160422 (move mir-opt miri tests to CI logic) - rust-lang/rust#160444 (Avoid resolving path keywords outside `TypeNS`) - rust-lang/rust#160510 (Resolver: (un)tracked borrows for `CmRefCell` made safe by unsafe speculative flag) - rust-lang/rust#155424 ([blocked] Link to proposed LLM policy in CONTRIBUTING and pull request template) - rust-lang/rust#158726 (std: move futex implementations into sys::sync::futex) - rust-lang/rust#158762 (Emit thumb code on VEX V5) - rust-lang/rust#159225 (Split IncrCompSession out of Session) - rust-lang/rust#159820 (Make the `rustc_unsafe_specialization_marker` attribute actually `unsafe`) - rust-lang/rust#160198 (Rework `smallest_range_containing` to handle duplicates) - rust-lang/rust#160362 (Split `SpannedTypeVisitor` into its own crate, `rustc_ty_walk`) - rust-lang/rust#160390 (autodiff: Handle slice-tailed DSTs in type trees) - rust-lang/rust#160420 (Suggest `cast_signed()` for overflowing signed integer literals) - rust-lang/rust#160501 (Add bootstrap CLI snapshot test for testing miri) - rust-lang/rust#160516 (Add regression test for HRTB projection in closure) - rust-lang/rust#160520 (Add some tests for specialization) - rust-lang/rust#160522 (fix(bootstrap): Normalize the names of proc macro dependency crates) - rust-lang/rust#160523 (Add regression test for opaque type) - rust-lang/rust#160531 (docs: fix typo in AllowExprMetavar comment) - rust-lang/rust#160538 (Update expect messages in tcp.rs doc examples to follow the style guide) - rust-lang/rust#160548 (bootstrap: Register `coverage-map` and `coverage-run` aliases via a separate step)

Emit thumb code on VEX V5
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Fix up suggested VEXos linker flags for thumb
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Fix up suggested VEXos linker flags for thumb
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Fix up suggested VEXos linker flags for thumb
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Fix up suggested VEXos linker flags for thumb
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Fix up suggested VEXos linker flags for thumb
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Fix up suggested VEXos linker flags for thumb
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Fix up suggested VEXos linker flags for thumb
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