fix android x86_64 build

rgb-lib-ffi/Cargo.toml

@@ -20,12 +20,6 @@ default = ["uniffi/cli"]
 rgb-lib = { version = "0.2.0-alpha.5", path = "../" }
 uniffi = "0.24.3"
 
-# fixed-version dependencies to support building with rust 1.67
-anstyle = "=1.0.1"
-anstyle-parse = "=0.2.1"
-clap_lex = "=0.5.0"
-clap_derive = "=4.3.12"
-
 [build-dependencies]
 uniffi = { version = "0.24.3", features = ["build"] }
 

rgb-lib-ffi/build.rs

@@ -1,3 +1,40 @@
+use std::env;
+use std::path::Path;
+
+const DEFAULT_CLANG_VERSION: &str = "14.0.7";
+
+/// Adds a temporary workaround for an issue with the Rust compiler and Android
+/// in x86_64 devices: https://github.com/rust-lang/rust/issues/109717.
+/// The workaround comes from: https://github.com/mozilla/application-services/pull/5442
+fn setup_x86_64_android_workaround() {
+    let target_os = env::var("CARGO_CFG_TARGET_OS").expect("CARGO_CFG_TARGET_OS not set");
+    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").expect("CARGO_CFG_TARGET_ARCH not set");
+    if target_arch == "x86_64" && target_os == "android" {
+        let android_ndk_home = env::var("ANDROID_NDK_ROOT").expect("ANDROID_NDK_ROOT not set");
+        let build_os = match env::consts::OS {
+            "linux" => "linux",
+            "macos" => "darwin",
+            "windows" => "windows",
+            _ => panic!(
+                "Unsupported OS. You must use either Linux, MacOS or Windows to build the crate."
+            ),
+        };
+        let clang_version =
+            env::var("NDK_CLANG_VERSION").unwrap_or_else(|_| DEFAULT_CLANG_VERSION.to_owned());
+        let linux_x86_64_lib_dir = format!(
+            "toolchains/llvm/prebuilt/{build_os}-x86_64/lib64/clang/{clang_version}/lib/linux/"
+        );
+        let linkpath = format!("{android_ndk_home}/{linux_x86_64_lib_dir}");
+        if Path::new(&linkpath).exists() {
+            println!("cargo:rustc-link-search={android_ndk_home}/{linux_x86_64_lib_dir}");
+            println!("cargo:rustc-link-lib=static=clang_rt.builtins-x86_64-android");
+        } else {
+            panic!("Path {linkpath} not exists");
+        }
+    }
+}
+
 fn main() {
+    setup_x86_64_android_workaround();
     uniffi::generate_scaffolding("src/rgb-lib.udl").expect("UDL should be valid");
 }