Retrieve PolkaVM target spec from linker

crates/build/src/args.rs

@@ -14,9 +14,6 @@
 // You should have received a copy of the GNU General Public License
 // along with cargo-contract.  If not, see <http://www.gnu.org/licenses/>.
 
-use crate::CrateMetadata;
-use anyhow::Result;
-use clap::Args;
 use std::{
     convert::TryFrom,
     fmt,
@@ -26,6 +23,15 @@ use std::{
     path::Path,
 };
 
+use anyhow::Result;
+use clap::Args;
+use polkavm_linker::TARGET_JSON_64_BIT as POLKAVM_TARGET_JSON_64_BIT;
+
+use crate::CrateMetadata;
+
+/// Name of the rustc/LLVM custom target spec for PolkaVM.
+const POLKAVM_TARGET_NAME: &str = "riscv64emac-unknown-none-polkavm";
+
 #[derive(Default, Clone, Copy, Debug, Args)]
 pub struct VerbosityFlags {
     /// No output printed to stdout
@@ -145,21 +151,21 @@ impl Target {
         // target configuration here. The path to the file is passed for the
         // `rustc --target` argument. We write this file to the `target/` folder.
         let target_dir = crate_metadata.target_directory.to_string_lossy();
-        let path = format!("{}/riscv64emac-unknown-none-polkavm.json", target_dir);
+        let path = format!("{}/{POLKAVM_TARGET_NAME}.json", target_dir);
         if !Path::exists(Path::new(&path)) {
             fs::create_dir_all(&crate_metadata.target_directory).unwrap_or_else(|e| {
                 panic!("unable to create target dir {:?}: {:?}", target_dir, e)
             });
             let mut file = File::create(&path).unwrap();
-            let config = include_str!("../riscv64emac-unknown-none-polkavm.json");
-            file.write_all(config.as_bytes()).unwrap();
+            file.write_all(POLKAVM_TARGET_JSON_64_BIT.as_bytes())
+                .unwrap();
         }
         path
     }
 
     /// The name used for the target folder inside the `target/` folder.
     pub fn llvm_target_alias() -> &'static str {
-        "riscv64emac-unknown-none-polkavm"
+        POLKAVM_TARGET_NAME
     }
 
     /// Target specific flags to be set to `CARGO_ENCODED_RUSTFLAGS` while building.