1 files changed, 43 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_cranelift/build_system/build_backend.rs b/compiler/rustc_codegen_cranelift/build_system/build_backend.rs
new file mode 100644
index 000000000..48faec8bc
--- /dev/null
+++ b/compiler/rustc_codegen_cranelift/build_system/build_backend.rs
@@ -0,0 +1,43 @@
+use std::env;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+
+pub(crate) fn build_backend(
+    channel: &str,
+    host_triple: &str,
+    use_unstable_features: bool,
+) -> PathBuf {
+    let mut cmd = Command::new("cargo");
+    cmd.arg("build").arg("--target").arg(host_triple);
+
+    cmd.env("CARGO_BUILD_INCREMENTAL", "true"); // Force incr comp even in release mode
+
+    let mut rustflags = env::var("RUSTFLAGS").unwrap_or_default();
+
+    if env::var("CI").as_ref().map(|val| &**val) == Ok("true") {
+        // Deny warnings on CI
+        rustflags += " -Dwarnings";
+
+        // Disabling incr comp reduces cache size and incr comp doesn't save as much on CI anyway
+        cmd.env("CARGO_BUILD_INCREMENTAL", "false");
+    }
+
+    if use_unstable_features {
+        cmd.arg("--features").arg("unstable-features");
+    }
+
+    match channel {
+        "debug" => {}
+        "release" => {
+            cmd.arg("--release");
+        }
+        _ => unreachable!(),
+    }
+
+    cmd.env("RUSTFLAGS", rustflags);
+
+    eprintln!("[BUILD] rustc_codegen_cranelift");
+    super::utils::spawn_and_wait(cmd);
+
+    Path::new("target").join(host_triple).join(channel)
+}