Get rustc version at compile time

Author: cohaereo

CHANGELOG.md

@@ -87,6 +87,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 - Fixed some concurrency-related crashes in the renderer by adding a reentrant lock to the immediate context
 - Fixed a stack overflow in debug mode by moving global scopes/pipelines to the heap
 - When a texture handle is explicitly set to `none`, Alkahest will now properly unset the texture instead of binding the fallback texture
+- Bake rustc version as a constant instead of checking it at runtime
 
 ## 0.5.0 - 2024-07-24
 

crates/alkahest-renderer/src/gpu/mod.rs

@@ -10,7 +10,6 @@ use std::{
         atomic::{AtomicBool, AtomicI32, AtomicU32, AtomicUsize, Ordering},
         Arc,
     },
-    thread::ThreadId,
     time::Duration,
 };
 

crates/alkahest/Cargo.toml

@@ -70,7 +70,6 @@ paste = "1.0.14"
 profiling.workspace = true
 puffin_egui = "0.29.0"
 reqwest = { version = "0.12.3", features = ["json"] }
-rustc_version = "0.4.0"
 rustc-hash.workspace = true
 semver = "1.0.21"
 smallvec.workspace = true
@@ -103,4 +102,5 @@ targets = ["x86_64-pc-windows-gnu"]
 targets = ["x86_64-pc-windows-gnu"]
 
 [build-dependencies]
+rustc_version = "0.4.0"
 winres = "0.1.12"

crates/alkahest/build.rs

@@ -29,6 +29,10 @@ fn main() {
         println!("cargo:rustc-env=GIT_HASH=unknown-revision");
     }
 
+    if let Ok(v) = rustc_version::version_meta() {
+        println!("cargo:rustc-env=RUSTC_VERSION={}", v.semver);
+    }
+
     if cfg!(target_os = "windows") {
         let mut res = winres::WindowsResource::new();
         res.set_icon("assets/icon2.ico");

crates/alkahest/src/gui/menu/mod.rs

@@ -134,10 +134,8 @@ impl MenuBar {
                                 ui.separator();
                                 ui.label(format!("Revision {}", consts::GIT_HASH));
                                 ui.label(format!("Built on {}", consts::BUILD_DATE));
-                                if let Ok(v) = rustc_version::version_meta() {
-                                    ui.add_space(8.0);
-                                    ui.label(format!("rustc {}+{:?}", v.semver, v.channel));
-                                }
+                                ui.add_space(8.0);
+                                ui.label(format!("rustc {}", consts::RUSTC_VERSION));
                             })
                         });
                     })

crates/alkahest/src/util/consts.rs

@@ -4,6 +4,7 @@ use glam::Vec4;
 pub const BUILD_DATE: &str = build_time_utc!("%Y-%m-%d");
 pub const BUILD_TIMESTAMP: &str = build_time_utc!();
 pub const GIT_HASH: &str = env!("GIT_HASH");
+pub const RUSTC_VERSION: &str = env!("RUSTC_VERSION");
 pub const VERSION: &str = env!("CARGO_PKG_VERSION");
 pub const CHANGELOG_MD: &str = include_str!("../../../../CHANGELOG.md");