Update the platform support policy with a tier 3 section including freebsd and 32-bit windows (#18345)

zanieb · web-flow · commit d1c6f037268b · 2026-03-07T09:12:36.000-06:00
And I'll add Android once we land some more patches.
diff --git a/docs/reference/policies/platforms.md b/docs/reference/policies/platforms.md
@@ -9,11 +9,11 @@ uv has Tier 1 support for the following platforms:
 
 uv is continuously built, tested, and developed against its Tier 1 platforms. Inspired by the Rust
 project, Tier 1 can be thought of as
-["guaranteed to work"](https://doc.rust-lang.org/beta/rustc/platform-support.html).
+["guaranteed to work"](https://doc.rust-lang.org/beta/rustc/platform-support.html#tier-1).
 
 uv has Tier 2 support
-(["guaranteed to build"](https://doc.rust-lang.org/beta/rustc/platform-support.html)) for the
-following platforms:
+(["guaranteed to build"](https://doc.rust-lang.org/beta/rustc/platform-support.html#tier-2-with-host-tools))
+for the following platforms:
 
 - Linux (PPC64LE)
 - Linux (RISC-V64)
@@ -23,13 +23,24 @@ following platforms:
 - Linux (s390x)
 - Windows (arm64)
 
-uv ships pre-built wheels to [PyPI](https://pypi.org/project/uv/) for its Tier 1 and Tier 2
-platforms. However, while Tier 2 platforms are continuously built, they are not continuously tested
-or developed against, and so stability may vary in practice.
+uv has Tier 3 support
+(["best effort"](https://doc.rust-lang.org/beta/rustc/platform-support.html#tier-3)) for the
+following platforms:
+
+- FreeBSD (x86_64)
+- Windows (i686)
+
+uv provides official binaries on GitHub and pre-built wheels on [PyPI](https://pypi.org/project/uv/)
+for its Tier 1 and Tier 2 platforms.
+
+Tier 2 platforms are continuously built, but the uv test suite is not run on them and stability may
+vary in practice.
+
+Tier 3 platforms may not be built or tested, but uv will accept patches to fix bugs.
+
+## Windows versions
 
-Beyond the Tier 1 and Tier 2 platforms, uv is known to build on i686 Windows, and known _not_ to
-build on aarch64 Windows, but does not consider either platform to be supported at this time. The
-minimum supported Windows versions are Windows 10 and Windows Server 2016, following
+The minimum supported Windows versions are Windows 10 and Windows Server 2016, following
 [Rust's own Tier 1 support](https://blog.rust-lang.org/2024/02/26/Windows-7.html).
 
 ## macOS versions
