[ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0) #153397

Closed
#153763
Closed
[ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0)#153397
#153763
Assignees
nikic
Labels
A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
Milestone
1.95.0

Description

@Pipboyguy
Pipboyguy
opened on Mar 4, 2026

Code

Any crate with sufficient code triggers this. Minimal reproducer using aho-corasick:

cargo new --lib repro &&cd repro
sed -i '''s/\[dependencies\]/[dependencies]\naho-corasick = "1.1.4"/' Cargo.toml
echo'pub fn f() { let _ = aho_corasick::AhoCorasick::new(["hello"]).unwrap(); }'> src/lib.rs
RUSTFLAGS="-C target-cpu=native" cargo +nightly build

Fails at opt-level >= 1. Works at opt-level = 0.

Meta

rustc --version --verbose:

rustc 1.96.0-nightly (d9563937f 2026-03-03)
binary: rustc
commit-hash: d9563937fa3b030c5845811113505070109414d2
commit-date: 2026-03-03
host: aarch64-apple-darwin
release: 1.96.0-nightly
LLVM version: 22.1.0

Hardware: Apple M5 (detected by LLVM as apple-m4 — LLVM does not yet know M5).

Error output

target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
rustc-LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `aho-corasick` (lib)
Caused by:
process didn't exit successfully: `rustc --crate-name aho_corasick ... -C target-cpu=native` (exit status: 101)

Analysis

-C target-cpu=native resolves to apple-m4 on this Apple M5 host. At opt-level >= 1, LLVM generates IR with an empty entry in the target-features function attribute (e.g. "+feat1,,+feat2"). The LLVM 22 IR Verifier rejects this with "target-features attribute should not contain an empty string" and aborts.

At opt-level = 0 the same code compiles successfully. Stable Rust (1.85.1, LLVM 19) also works fine with the same flags.

The root cause is likely in how rustc or LLVM 22 constructs the target-features string for the apple-m4 CPU definition — an empty feature name is being included in the comma-separated list.

Bisection notes

Not yet bisected. The bug is present on nightly 2026-03-03 (LLVM 22.1.0) and absent on stable 1.85.1 (LLVM 19). Likely introduced with the LLVM 22 upgrade.

Metadata

Metadata

Assignees

Labels

A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.

Type

No type

Projects

No projects

    Milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions

    , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
     blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

    Skip to content
    [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0) #153397
    Closed
    #153763
    Closed
    [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0)#153397
    #153763
    Assignees
    nikic
    Labels
    A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
    Milestone
    1.95.0
    Description
    @Pipboyguy
    Pipboyguy
    opened on Mar 4, 2026
    Code
    Any crate with sufficient code triggers this. Minimal reproducer using aho-corasick:
    cargo new --lib repro &&cd repro
sed -i '''s/\[dependencies\]/[dependencies]\naho-corasick = "1.1.4"/' Cargo.toml
echo'pub fn f() { let _ = aho_corasick::AhoCorasick::new(["hello"]).unwrap(); }'> src/lib.rs
RUSTFLAGS="-C target-cpu=native" cargo +nightly build
    Fails at opt-level >= 1. Works at opt-level = 0.
    Meta
    rustc --version --verbose:
    rustc 1.96.0-nightly (d9563937f 2026-03-03)
binary: rustc
commit-hash: d9563937fa3b030c5845811113505070109414d2
commit-date: 2026-03-03
host: aarch64-apple-darwin
release: 1.96.0-nightly
LLVM version: 22.1.0

    Hardware: Apple M5 (detected by LLVM as apple-m4 — LLVM does not yet know M5).
    Error output
    target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
rustc-LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `aho-corasick` (lib)
Caused by:
process didn't exit successfully: `rustc --crate-name aho_corasick ... -C target-cpu=native` (exit status: 101)

    Analysis
    -C target-cpu=native resolves to apple-m4 on this Apple M5 host. At opt-level >= 1, LLVM generates IR with an empty entry in the target-features function attribute (e.g. "+feat1,,+feat2"). The LLVM 22 IR Verifier rejects this with "target-features attribute should not contain an empty string" and aborts.
    At opt-level = 0 the same code compiles successfully. Stable Rust (1.85.1, LLVM 19) also works fine with the same flags.
    The root cause is likely in how rustc or LLVM 22 constructs the target-features string for the apple-m4 CPU definition — an empty feature name is being included in the comma-separated list.
    Bisection notes
    Not yet bisected. The bug is present on nightly 2026-03-03 (LLVM 22.1.0) and absent on stable 1.85.1 (LLVM 19). Likely introduced with the LLVM 22 upgrade.
    Metadata
    Metadata
    Assignees
    Labels
    A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
    Type
    No type
    Projects
    No projects
      Milestone
      Relationships
      None yet
      Development
      No branches or pull requests
      Issue actions
      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

      Skip to content
      [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0) #153397
      Closed
      #153763
      Closed
      [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0)#153397
      #153763
      Assignees
      nikic
      Labels
      A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
      Milestone
      1.95.0
      Description
      @Pipboyguy
      Pipboyguy
      opened on Mar 4, 2026
      Code
      Any crate with sufficient code triggers this. Minimal reproducer using aho-corasick:
      cargo new --lib repro &&cd repro
sed -i '''s/\[dependencies\]/[dependencies]\naho-corasick = "1.1.4"/' Cargo.toml
echo'pub fn f() { let _ = aho_corasick::AhoCorasick::new(["hello"]).unwrap(); }'> src/lib.rs
RUSTFLAGS="-C target-cpu=native" cargo +nightly build
      Fails at opt-level >= 1. Works at opt-level = 0.
      Meta
      rustc --version --verbose:
      rustc 1.96.0-nightly (d9563937f 2026-03-03)
binary: rustc
commit-hash: d9563937fa3b030c5845811113505070109414d2
commit-date: 2026-03-03
host: aarch64-apple-darwin
release: 1.96.0-nightly
LLVM version: 22.1.0

      Hardware: Apple M5 (detected by LLVM as apple-m4 — LLVM does not yet know M5).
      Error output
      target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
rustc-LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `aho-corasick` (lib)
Caused by:
process didn't exit successfully: `rustc --crate-name aho_corasick ... -C target-cpu=native` (exit status: 101)

      Analysis
      -C target-cpu=native resolves to apple-m4 on this Apple M5 host. At opt-level >= 1, LLVM generates IR with an empty entry in the target-features function attribute (e.g. "+feat1,,+feat2"). The LLVM 22 IR Verifier rejects this with "target-features attribute should not contain an empty string" and aborts.
      At opt-level = 0 the same code compiles successfully. Stable Rust (1.85.1, LLVM 19) also works fine with the same flags.
      The root cause is likely in how rustc or LLVM 22 constructs the target-features string for the apple-m4 CPU definition — an empty feature name is being included in the comma-separated list.
      Bisection notes
      Not yet bisected. The bug is present on nightly 2026-03-03 (LLVM 22.1.0) and absent on stable 1.85.1 (LLVM 19). Likely introduced with the LLVM 22 upgrade.
      Metadata
      Metadata
      Assignees
      Labels
      A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
      Type
      No type
      Projects
      No projects
        Milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0) #153397
        Closed
        #153763
        Closed
        [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0)#153397
        #153763
        Assignees
        nikic
        Labels
        A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
        Milestone
        1.95.0
        Description
        @Pipboyguy
        Pipboyguy
        opened on Mar 4, 2026
        Code
        Any crate with sufficient code triggers this. Minimal reproducer using aho-corasick:
        cargo new --lib repro &&cd repro
sed -i '''s/\[dependencies\]/[dependencies]\naho-corasick = "1.1.4"/' Cargo.toml
echo'pub fn f() { let _ = aho_corasick::AhoCorasick::new(["hello"]).unwrap(); }'> src/lib.rs
RUSTFLAGS="-C target-cpu=native" cargo +nightly build
        Fails at opt-level >= 1. Works at opt-level = 0.
        Meta
        rustc --version --verbose:
        rustc 1.96.0-nightly (d9563937f 2026-03-03)
binary: rustc
commit-hash: d9563937fa3b030c5845811113505070109414d2
commit-date: 2026-03-03
host: aarch64-apple-darwin
release: 1.96.0-nightly
LLVM version: 22.1.0

        Hardware: Apple M5 (detected by LLVM as apple-m4 — LLVM does not yet know M5).
        Error output
        target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
rustc-LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `aho-corasick` (lib)
Caused by:
process didn't exit successfully: `rustc --crate-name aho_corasick ... -C target-cpu=native` (exit status: 101)

        Analysis
        -C target-cpu=native resolves to apple-m4 on this Apple M5 host. At opt-level >= 1, LLVM generates IR with an empty entry in the target-features function attribute (e.g. "+feat1,,+feat2"). The LLVM 22 IR Verifier rejects this with "target-features attribute should not contain an empty string" and aborts.
        At opt-level = 0 the same code compiles successfully. Stable Rust (1.85.1, LLVM 19) also works fine with the same flags.
        The root cause is likely in how rustc or LLVM 22 constructs the target-features string for the apple-m4 CPU definition — an empty feature name is being included in the comma-separated list.
        Bisection notes
        Not yet bisected. The bug is present on nightly 2026-03-03 (LLVM 22.1.0) and absent on stable 1.85.1 (LLVM 19). Likely introduced with the LLVM 22 upgrade.
        Metadata
        Metadata
        Assignees
        Labels
        A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
        Type
        No type
        Projects
        No projects
          Milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0) #153397
          Closed
          #153763
          Closed
          [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0)#153397
          #153763
          Assignees
          nikic
          Labels
          A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
          Milestone
          1.95.0
          Description
          @Pipboyguy
          Pipboyguy
          opened on Mar 4, 2026
          Code
          Any crate with sufficient code triggers this. Minimal reproducer using aho-corasick:
          cargo new --lib repro &&cd repro
sed -i '''s/\[dependencies\]/[dependencies]\naho-corasick = "1.1.4"/' Cargo.toml
echo'pub fn f() { let _ = aho_corasick::AhoCorasick::new(["hello"]).unwrap(); }'> src/lib.rs
RUSTFLAGS="-C target-cpu=native" cargo +nightly build
          Fails at opt-level >= 1. Works at opt-level = 0.
          Meta
          rustc --version --verbose:
          rustc 1.96.0-nightly (d9563937f 2026-03-03)
binary: rustc
commit-hash: d9563937fa3b030c5845811113505070109414d2
commit-date: 2026-03-03
host: aarch64-apple-darwin
release: 1.96.0-nightly
LLVM version: 22.1.0

          Hardware: Apple M5 (detected by LLVM as apple-m4 — LLVM does not yet know M5).
          Error output
          target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
rustc-LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `aho-corasick` (lib)
Caused by:
process didn't exit successfully: `rustc --crate-name aho_corasick ... -C target-cpu=native` (exit status: 101)

          Analysis
          -C target-cpu=native resolves to apple-m4 on this Apple M5 host. At opt-level >= 1, LLVM generates IR with an empty entry in the target-features function attribute (e.g. "+feat1,,+feat2"). The LLVM 22 IR Verifier rejects this with "target-features attribute should not contain an empty string" and aborts.
          At opt-level = 0 the same code compiles successfully. Stable Rust (1.85.1, LLVM 19) also works fine with the same flags.
          The root cause is likely in how rustc or LLVM 22 constructs the target-features string for the apple-m4 CPU definition — an empty feature name is being included in the comma-separated list.
          Bisection notes
          Not yet bisected. The bug is present on nightly 2026-03-03 (LLVM 22.1.0) and absent on stable 1.85.1 (LLVM 19). Likely introduced with the LLVM 22 upgrade.
          Metadata
          Metadata
          Assignees
          Labels
          A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
          Type
          No type
          Projects
          No projects
            Milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0) #153397
            Closed
            #153763
            Closed
            [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0)#153397
            #153763
            Assignees
            nikic
            Labels
            A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
            Milestone
            1.95.0
            Description
            @Pipboyguy
            Pipboyguy
            opened on Mar 4, 2026
            Code
            Any crate with sufficient code triggers this. Minimal reproducer using aho-corasick:
            cargo new --lib repro &&cd repro
sed -i '''s/\[dependencies\]/[dependencies]\naho-corasick = "1.1.4"/' Cargo.toml
echo'pub fn f() { let _ = aho_corasick::AhoCorasick::new(["hello"]).unwrap(); }'> src/lib.rs
RUSTFLAGS="-C target-cpu=native" cargo +nightly build
            Fails at opt-level >= 1. Works at opt-level = 0.
            Meta
            rustc --version --verbose:
            rustc 1.96.0-nightly (d9563937f 2026-03-03)
binary: rustc
commit-hash: d9563937fa3b030c5845811113505070109414d2
commit-date: 2026-03-03
host: aarch64-apple-darwin
release: 1.96.0-nightly
LLVM version: 22.1.0

            Hardware: Apple M5 (detected by LLVM as apple-m4 — LLVM does not yet know M5).
            Error output
            target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
rustc-LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `aho-corasick` (lib)
Caused by:
process didn't exit successfully: `rustc --crate-name aho_corasick ... -C target-cpu=native` (exit status: 101)

            Analysis
            -C target-cpu=native resolves to apple-m4 on this Apple M5 host. At opt-level >= 1, LLVM generates IR with an empty entry in the target-features function attribute (e.g. "+feat1,,+feat2"). The LLVM 22 IR Verifier rejects this with "target-features attribute should not contain an empty string" and aborts.
            At opt-level = 0 the same code compiles successfully. Stable Rust (1.85.1, LLVM 19) also works fine with the same flags.
            The root cause is likely in how rustc or LLVM 22 constructs the target-features string for the apple-m4 CPU definition — an empty feature name is being included in the comma-separated list.
            Bisection notes
            Not yet bisected. The bug is present on nightly 2026-03-03 (LLVM 22.1.0) and absent on stable 1.85.1 (LLVM 19). Likely introduced with the LLVM 22 upgrade.
            Metadata
            Metadata
            Assignees
            Labels
            A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
            Type
            No type
            Projects
            No projects
              Milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0) #153397
              Closed
              #153763
              Closed
              [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0)#153397
              #153763
              Assignees
              nikic
              Labels
              A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
              Milestone
              1.95.0
              Description
              @Pipboyguy
              Pipboyguy
              opened on Mar 4, 2026
              Code
              Any crate with sufficient code triggers this. Minimal reproducer using aho-corasick:
              cargo new --lib repro &&cd repro
sed -i '''s/\[dependencies\]/[dependencies]\naho-corasick = "1.1.4"/' Cargo.toml
echo'pub fn f() { let _ = aho_corasick::AhoCorasick::new(["hello"]).unwrap(); }'> src/lib.rs
RUSTFLAGS="-C target-cpu=native" cargo +nightly build
              Fails at opt-level >= 1. Works at opt-level = 0.
              Meta
              rustc --version --verbose:
              rustc 1.96.0-nightly (d9563937f 2026-03-03)
binary: rustc
commit-hash: d9563937fa3b030c5845811113505070109414d2
commit-date: 2026-03-03
host: aarch64-apple-darwin
release: 1.96.0-nightly
LLVM version: 22.1.0

              Hardware: Apple M5 (detected by LLVM as apple-m4 — LLVM does not yet know M5).
              Error output
              target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
rustc-LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `aho-corasick` (lib)
Caused by:
process didn't exit successfully: `rustc --crate-name aho_corasick ... -C target-cpu=native` (exit status: 101)

              Analysis
              -C target-cpu=native resolves to apple-m4 on this Apple M5 host. At opt-level >= 1, LLVM generates IR with an empty entry in the target-features function attribute (e.g. "+feat1,,+feat2"). The LLVM 22 IR Verifier rejects this with "target-features attribute should not contain an empty string" and aborts.
              At opt-level = 0 the same code compiles successfully. Stable Rust (1.85.1, LLVM 19) also works fine with the same flags.
              The root cause is likely in how rustc or LLVM 22 constructs the target-features string for the apple-m4 CPU definition — an empty feature name is being included in the comma-separated list.
              Bisection notes
              Not yet bisected. The bug is present on nightly 2026-03-03 (LLVM 22.1.0) and absent on stable 1.85.1 (LLVM 19). Likely introduced with the LLVM 22 upgrade.
              Metadata
              Metadata
              Assignees
              Labels
              A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
              Type
              No type
              Projects
              No projects
                Milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions
                
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                Skip to content
                [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0) #153397
                Closed
                #153763
                Closed
                [ICE]: LLVM ERROR "Broken module" with -C target-cpu=native on aarch64-apple-darwin (Apple M5, LLVM 22.1.0)#153397
                #153763
                Assignees
                nikic
                Labels
                A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
                Milestone
                1.95.0
                Description
                @Pipboyguy
                Pipboyguy
                opened on Mar 4, 2026
                Code
                Any crate with sufficient code triggers this. Minimal reproducer using aho-corasick:
                cargo new --lib repro &&cd repro
sed -i '''s/\[dependencies\]/[dependencies]\naho-corasick = "1.1.4"/' Cargo.toml
echo'pub fn f() { let _ = aho_corasick::AhoCorasick::new(["hello"]).unwrap(); }'> src/lib.rs
RUSTFLAGS="-C target-cpu=native" cargo +nightly build
                Fails at opt-level >= 1. Works at opt-level = 0.
                Meta
                rustc --version --verbose:
                rustc 1.96.0-nightly (d9563937f 2026-03-03)
binary: rustc
commit-hash: d9563937fa3b030c5845811113505070109414d2
commit-date: 2026-03-03
host: aarch64-apple-darwin
release: 1.96.0-nightly
LLVM version: 22.1.0

                Hardware: Apple M5 (detected by LLVM as apple-m4 — LLVM does not yet know M5).
                Error output
                target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
target-features attribute should not contain an empty string
rustc-LLVM ERROR: Broken module found, compilation aborted!
error: could not compile `aho-corasick` (lib)
Caused by:
process didn't exit successfully: `rustc --crate-name aho_corasick ... -C target-cpu=native` (exit status: 101)

                Analysis
                -C target-cpu=native resolves to apple-m4 on this Apple M5 host. At opt-level >= 1, LLVM generates IR with an empty entry in the target-features function attribute (e.g. "+feat1,,+feat2"). The LLVM 22 IR Verifier rejects this with "target-features attribute should not contain an empty string" and aborts.
                At opt-level = 0 the same code compiles successfully. Stable Rust (1.85.1, LLVM 19) also works fine with the same flags.
                The root cause is likely in how rustc or LLVM 22 constructs the target-features string for the apple-m4 CPU definition — an empty feature name is being included in the comma-separated list.
                Bisection notes
                Not yet bisected. The bug is present on nightly 2026-03-03 (LLVM 22.1.0) and absent on stable 1.85.1 (LLVM 19). Likely introduced with the LLVM 22 upgrade.
                Metadata
                Metadata
                Assignees
                Labels
                A-LLVMArea: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.C-bugCategory: This is a bug.I-llvm-errorImpact: An error from LLVM is directly exposed by valid codeO-appleOperating system: Apple / Darwin (macOS, iOS, tvOS, visionOS, watchOS)P-criticalCritical priorityT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.regression-from-stable-to-betaPerformance or correctness regression from stable to beta.
                Type
                No type
                Projects
                No projects
                  Milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions