qurt: Add support for Qualcomm QuRT by androm3da · Pull Request #4845 · rust-lang/libc

androm3da · 2025-11-21T19:53:04Z

The QuRT RTOS -- used primarily on the Hexagon architecture -- has support for large parts of POSIX.

Description

Add support for Hexagon QuRT OS.

Sources

The corresponding sources from the Hexagon SDK from https://github.com/snapdragon-toolchain/hexagon-sdk or https://softwarecenter.qualcomm.com/catalog/item/Hexagon_SDK

Checklist

N/A - Relevant tests in libc-test/semver have been updated
No placeholder or unstable values like *LAST or *MAX are
included (see #3131)
Tested locally (cd libc-test && cargo test --target mytarget);
especially relevant for platforms that may not be checked in CI

tgross35

You will need to update

libc/build.rs

Lines 33 to 49 in a3bb40e

    
           // Extra values to allow for check-cfg. 
        
           const CHECK_CFG_EXTRA: &[(&str, &[&str])] = &[ 
        
               ( 
        
                   "target_os", 
        
                   &[ 
        
                       "switch", "aix", "ohos", "hurd", "rtems", "visionos", "nuttx", "cygwin", 
        
                   ], 
        
               ), 
        
               ( 
        
                   "target_env", 
        
                   &["illumos", "wasi", "aix", "ohos", "nto71_iosock", "nto80"], 
        
               ), 
        
               ( 
        
                   "target_arch", 
        
                   &["loongarch64", "mips32r6", "mips64r6", "csky"], 
        
               ), 
        
           ];

to make check-cfg work, since this target is only on nightly so far.

tgross35 · 2025-11-30T07:22:10Z

src/new/qurt/mod.rs

+pub(crate) mod errno;
+pub(crate) mod fcntl;
+pub(crate) mod limits;
+pub(crate) mod pthread;
+pub(crate) mod semaphore;
+pub(crate) mod signal;
+pub(crate) mod stdio;
+pub(crate) mod stdlib;
+pub(crate) mod sys;
+pub(crate) mod time;
+pub(crate) mod unistd;


I assume this needs to be filled in right? Or deleted.

I'd appreciate if you could at least make unistd.rs and pthread.rs in src/new roughly matching their .h files, since I've ported most other platforms at this point. Everything else is up to you; you can either add the modules like you have here (eventually everything will hopefully be like this) or just put it all in src/qurt like most other platforms (and I'll move them over later).

tgross35 · 2025-11-30T07:22:21Z

src/new/qurt/mod.rs

+//! QuRT (Qualcomm Real-Time OS) bindings
+//!
+//! QuRT is Qualcomm's real-time operating system for Hexagon DSP architectures.


Mind adding a link to the SDK sources?

Here, in the PR comments or in the comments of src/new/qurt/mod.rs?

The doc comment - I've been doing this for src/new to give some breadcrumbs for anyone who wants to check / update things.

rustbot · 2025-11-30T07:26:19Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

androm3da · 2025-12-08T19:42:38Z

AFAICT this failure is not related to my changes - I wonder if it's the kind of thing that might get addressed by a rebase? Or just re-running it?

Maybe this is something that #4872 was intended to fix? Or on the flip side, introduced by #4872?

+ cargo test --target x86_64-unknown-freebsd --workspace --no-default-features -- --skip check_style
    Updating crates.io index
error: failed to get `askama` as a dependency of package `ctest v0.5.0-beta.1 (/tmp/cirrus-ci-build/ctest)`

Caused by:
  download of config.json failed

Caused by:
  failed to download from `https://index.crates.io/config.json`

Caused by:
  [60] SSL peer certificate or SSH remote key was not OK (SSL certificate OpenSSL verify result: unable to get local issuer certificate (20))

Exit status: 101

androm3da · 2025-12-09T14:36:10Z

@rustbot ready

tgross35 · 2025-12-17T07:30:00Z

src/qurt/mod.rs

It looks like a lot of the defs in this file are duplicated between src/qurt and src/new/qurt, don't they need to be dropped?

Other than this, LGTM.

Sorry: I have removed these duplicates now.

tgross35 · 2025-12-17T07:31:21Z

Also if you could squash any commits that have back-and-forth (e.g. adding src/qurt then later removing it) that would be helpful, makes backporting cleaner.

androm3da · 2025-12-17T18:16:12Z

Also if you could squash any commits that have back-and-forth (e.g. adding src/qurt then later removing it) that would be helpful, makes backporting cleaner.

I assumed that I would squash them all before merging? I have squashed all but the most recent changes now.

tgross35 · 2025-12-18T08:06:11Z

src/qurt/mod.rs

+    pub fn floor(x: c_double) -> c_double;
+    pub fn floorf(x: c_float) -> c_float;
+    pub fn fmod(x: c_double, y: c_double) -> c_double;
+    pub fn fmodf(x: c_float, y: c_float) -> c_float;


Noticed one other thing: we don't provide bindings for the math functions in libc, std binds them as necessary for the platform.

androm3da · 2025-12-19T04:28:09Z

@rustbot ready

tgross35

LGTM! Please just squash. (Needs to be done by the author since GH doesn't let me choose that option with the merge queue and I try to avoid pushing branches)

The QuRT RTOS -- used primarily on the Hexagon architecture -- has support for large parts of POSIX.

rustbot · 2025-12-28T12:48:04Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

The QuRT RTOS -- used primarily on the Hexagon architecture -- has support for large parts of POSIX. (backport <rust-lang#4845>) (cherry picked from commit 8ecae6c)

The QuRT RTOS -- used primarily on the Hexagon architecture -- has support for large parts of POSIX. (backport <#4845>) (cherry picked from commit 8ecae6c)

rustbot added the S-waiting-on-review label Nov 21, 2025

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androm3da force-pushed the bcain/qurt branch from a4b6dcf to 932ba01 Compare December 7, 2025 05:17

rustbot added S-waiting-on-review and removed S-waiting-on-author labels Dec 9, 2025

androm3da force-pushed the bcain/qurt branch from 932ba01 to aec4b56 Compare December 15, 2025 13:39

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androm3da force-pushed the bcain/qurt branch from aec4b56 to 7035a87 Compare December 17, 2025 18:14

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androm3da force-pushed the bcain/qurt branch from 00d65a0 to 20bdde6 Compare December 28, 2025 12:43

qurt: Add support for Qualcomm QuRT

adf2f43

The QuRT RTOS -- used primarily on the Hexagon architecture -- has support for large parts of POSIX.

androm3da force-pushed the bcain/qurt branch from 20bdde6 to adf2f43 Compare December 28, 2025 12:48

tgross35 added this pull request to the merge queue Dec 28, 2025

tgross35 added the stable-nominated This PR should be considered for cherry-pick to libc's stable release branch label Dec 28, 2025

Merged via the queue into rust-lang:main with commit 8ecae6c Dec 28, 2025
51 checks passed

rustbot removed the S-waiting-on-review label Dec 28, 2025

tgross35 mentioned this pull request Jan 3, 2026

[0.2] Backports #4906

Merged

github-merge-queue bot pushed a commit that referenced this pull request Jan 3, 2026

qurt: Add support for Qualcomm QuRT

ad6c4a1

The QuRT RTOS -- used primarily on the Hexagon architecture -- has support for large parts of POSIX. (backport <#4845>) (cherry picked from commit 8ecae6c)

tgross35 added stable-applied This PR has been cherry-picked to libc's stable release branch and removed stable-nominated This PR should be considered for cherry-pick to libc's stable release branch labels Jan 3, 2026

	// Extra values to allow for check-cfg.
	const CHECK_CFG_EXTRA: &[(&str, &[&str])] = &[
	(
	"target_os",
	&[
	"switch", "aix", "ohos", "hurd", "rtems", "visionos", "nuttx", "cygwin",
	],
	),
	(
	"target_env",
	&["illumos", "wasi", "aix", "ohos", "nto71_iosock", "nto80"],
	),
	(
	"target_arch",
	&["loongarch64", "mips32r6", "mips64r6", "csky"],
	),
	];

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androm3da commented Nov 21, 2025

Description

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