libffi-sys fails to build on riscv64gc-unknown-linux-gnu

[piggynl]

Rust uses riscv64gc-unknown-linux-gnu while ./configure uses riscv64-unknown-linux-gnu. One solution is the patch below. Is there a better way to handle this?

diff --git a/libffi-sys-rs/build/not_msvc.rs b/libffi-sys-rs/build/not_msvc.rs
index e41e076..634b710 100644
--- a/libffi-sys-rs/build/not_msvc.rs
+++ b/libffi-sys-rs/build/not_msvc.rs
@@ -53,7 +53,11 @@ pub fn configure_libffi(prefix: PathBuf, build_dir: &Path) {
 
     let target = std::env::var("TARGET").unwrap();
     if target != std::env::var("HOST").unwrap() {
-        command.arg(format!("--host={}", target.to_string()));
+        if target == "riscv64gc-unknown-linux-gnu" {
+            command.arg("--host=riscv64-unknown-linux-gnu");
+        } else {
+            command.arg(format!("--host={}", target));
+        }
     }
 
     command.current_dir(&build_dir);

[yorickpeterse]

If these are indeed the exact same architectures (just using different names) I think a change like this plus a comment describing why should be fine.

[piggynl]

Thanks! I will do it in a PR.