mesa: Bump required Rust version to 1.82

Firefox ESR requires Rust 1.82 since version 140. Thus, this update
is in line with our Rust update policy.

Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36526>

.gitlab-ci/container/build-rust.sh

@@ -8,7 +8,7 @@ set -ex
 section_start rust "Building Rust toolchain"
 
 # Pick a specific patch version from rustup so the compiler doesn't drift on us.
-RUST_VERSION=1.81.0
+RUST_VERSION=1.82.0
 
 # For rust in Mesa, we use rustup to install.  This lets us pick an arbitrary
 # version of the compiler, rather than whatever the container's Debian comes

.gitlab-ci/image-tags.yml

@@ -19,7 +19,7 @@ include:
   - .gitlab-ci/conditional-build-image-tags.yml
 
 variables:
-  DEBIAN_BASE_TAG: "20250723-decorless"
+  DEBIAN_BASE_TAG: "20250803-rustc"
 
   DEBIAN_BUILD_TAG: "20250722-libwayland"
 

docs/rusticl.rst

@@ -48,7 +48,7 @@ To build Rusticl you need to satisfy the following build dependencies:
 
 The minimum versions to build Rusticl are:
 
--  Rust: 1.78
+-  Rust: 1.82
 -  Meson: 1.7.0
 -  Bindgen: 0.71.1
 -  LLVM: 15.0.0 (recommended 19.0.0)

meson.build

@@ -769,8 +769,8 @@ if with_gallium_rusticl or with_nouveau_vk or with_tools.contains('etnaviv') or
   rustc = meson.get_compiler('rust')
   rust = import('rust')
 
-  if rustc.version().version_compare('< 1.78')
-    error('Mesa requires Rust 1.78.0 or newer')
+  if rustc.version().version_compare('< 1.82')
+    error('Mesa requires Rust 1.82.0 or newer')
   endif
 
   # bindgen 0.71 is the first version that knows about `editions`