--- title: Rust 1.99.0 released | daily.dev description: Rust 1.99.0 has shipped with support for extern "C" variadic functions, new functions for obtaining the size and alignment of raw pointers, and a set of newly... canonical: https://daily.dev/posts/rust-1-99-0-released-lj1ib7owa twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Rust 1.99.0 released | daily.dev og:description: Rust 1.99.0 has shipped with support for extern "C" variadic functions, new functions for obtaining the size and alignment of raw pointers, and a set of newly... og:url: https://daily.dev/posts/rust-1-99-0-released-lj1ib7owa og:image: https://api.daily.dev/og/posts/LJ1IB7OWa.png og:image:alt: Rust 1.99.0 released og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Rust 1.99.0 released **[LWN.net](https://daily.dev/sources/lwn)** · 1 min read · 0 upvotes · 0 comments ## Summary Rust 1.99.0 has shipped with support for extern "C" variadic functions, new functions for obtaining the size and alignment of raw pointers, and a set of newly stabilized standard library APIs. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What new FFI feature did Rust 1.99.0 add for working with C functions? Rust 1.99.0 adds support for extern "C" variadic functions, letting Rust code define or call C functions that take a variable number of arguments, similar to C's varargs mechanism. This release also introduces functions for obtaining the size and alignment of raw pointers, plus a number of newly stabilized standard library APIs. _Developers tracking Rust FFI capabilities can follow version-by-version changes like this on daily.dev._ ## Similar posts on daily.dev - [Announcing Rust 1.97.0](https://daily.dev/posts/announcing-rust-1-97-0-fqxhq3pfj) · Rust · 22 upvotes · 0 comments - [Rust 1.93 Brings Improvement For Inline Assembly Handling](https://daily.dev/posts/rust-1-93-brings-improvement-for-inline-assembly-handling-o9g10pe7q) · Phoronix · 0 upvotes · 0 comments --- Tags: [#rust](https://daily.dev/tags/rust) [View this post on daily.dev](https://daily.dev/posts/rust-1-99-0-released-lj1ib7owa) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Rust 1.99.0 released","url":"https://daily.dev/posts/rust-1-99-0-released-lj1ib7owa","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/rust-1-99-0-released-lj1ib7owa"},"datePublished":"2026-10-01T13:30:12.856Z","dateModified":"2026-10-01T13:30:41.177Z","description":"Rust 1.99.0 has shipped with support for extern \"C\" variadic functions, new functions for obtaining the size and alignment of raw pointers, and a set of newly...","image":"https://media.daily.dev/image/upload/s--P4t4XyoV--/f_auto/v1722860399/public/Placeholder%2001","thumbnailUrl":"https://media.daily.dev/image/upload/s--P4t4XyoV--/f_auto/v1722860399/public/Placeholder%2001","isAccessibleForFree":true,"articleSection":"LWN.net","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"LWN.net","logo":"https://media.daily.dev/image/upload/s--4jjE7GIK--/f_auto,q_auto/v1774960833/logos/lwn?_a=BAMAMiWQ0","url":"https://daily.dev/sources/lwn"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/rust-1-99-0-released-lj1ib7owa","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"rust","timeRequired":"PT1M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"LWN.net","item":"https://daily.dev/sources/lwn"},{"@type":"ListItem","position":3,"name":"Rust 1.99.0 released"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/rust-1-99-0-released-lj1ib7owa#faq","mainEntity":[{"@type":"Question","name":"What new FFI feature did Rust 1.99.0 add for working with C functions?","acceptedAnswer":{"@type":"Answer","text":"Rust 1.99.0 adds support for extern \"C\" variadic functions, letting Rust code define or call C functions that take a variable number of arguments, similar to C's varargs mechanism. 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