fix build on 1.82+

platform/rust/Cargo.toml

@@ -7,5 +7,6 @@ edition = "2021"
 cxx = "1.0"
 
 [build-dependencies]
-cxx-build = "1.0"
 cmake = "0.1"
+cxx-build = "1.0"
+rustversion = "1.0.19"

platform/rust/build.rs

@@ -1,6 +1,7 @@
 use std::env;
 use std::path::PathBuf;
 
+//noinspection RsConstantConditionIf
 fn main() {
     let project_root = {
         let manifest = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
@@ -25,7 +26,13 @@ fn main() {
 
     let lib_dir = build_dir.join("build");
     println!("cargo:rustc-link-search=native={}", lib_dir.display());
-    println!("cargo:rustc-link-lib=static=mbgl-core");
+    if rustversion::cfg!(since(1.82)) {
+        // `cargo test` wouldn't work with Rust v1.82+ without this
+        // FIXME: this MIGHT significantly increase the size of the final binary, needs to be tested
+        println!("cargo:rustc-link-lib=static:+whole-archive=mbgl-core");
+    } else {
+        println!("cargo:rustc-link-lib=static=mbgl-core");
+    }
 
     // cxx build
     let mut cxx = cxx_build::bridge("src/lib.rs");

platform/rust/src/lib.rs

@@ -17,7 +17,7 @@ mod ffi {
 }
 
 /// A safe Rust wrapper so you can call `ceil_log2` from your code:
-pub fn ceil_log2(x: u64) -> u32 {
+pub fn our_log(x: u64) -> u32 {
     ffi::ceil_log2(x)
 }
 
@@ -26,13 +26,13 @@ mod tests {
     use super::*;
     #[test]
     fn test_log2() {
-        let result = ceil_log2(1);
+        let result = our_log(1);
         assert_eq!(result, 0, "log2(1) = 0 bits needed");
 
-        let result = ceil_log2(2);
+        let result = our_log(2);
         assert_eq!(result, 1, "log2(2) = 1 bit needed");
 
-        let result = ceil_log2(3);
+        let result = our_log(3);
         assert_eq!(result, 2, "log2(3) -> 2 bits needed");
     }
 }