rusticl: bump rust req to 1.76

Current FireFox ESR requires 1.76, so this is an update according to our
rust update policy.

Reviewed-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30414>

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

@@ -15,7 +15,7 @@ ln -s /usr/local/bin "$HOME"/.cargo/bin
 #
 # Also, pick a specific snapshot from rustup so the compiler doesn't drift on
 # us.
-RUST_VERSION=1.73.0-2023-10-05
+RUST_VERSION=1.76.0-2024-02-08
 
 # 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

@@ -13,7 +13,7 @@
 
 variables:
    DEBIAN_X86_64_BUILD_BASE_IMAGE: "debian/x86_64_build-base"
-   DEBIAN_BASE_TAG: "20240717-pyyaml-3"
+   DEBIAN_BASE_TAG: "20240729-rustc-bump"
 
    DEBIAN_X86_64_BUILD_IMAGE_PATH: "debian/x86_64_build"
    DEBIAN_BUILD_TAG: "20240717-pyyaml-3"

docs/rusticl.rst

@@ -31,7 +31,7 @@ To build Rusticl you need to satisfy the following build dependencies:
 
 The minimum versions to build Rusticl are:
 
--  Rust: 1.66
+-  Rust: 1.76
 -  Meson: 1.4.0
 -  Bindgen: 0.65.0
 -  LLVM: 15.0.0

meson.build

@@ -848,6 +848,10 @@ if with_gallium_rusticl
 
   add_languages('rust', required: true)
   rustc = meson.get_compiler('rust')
+
+  if rustc.version().version_compare('< 1.76')
+    error('rusticl requires Rust 1.76.0 or newer')
+  endif
 endif
 
 with_clover_spirv = with_gallium_clover and get_option('opencl-spirv')