1 files changed, 25 insertions, 0 deletions
diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/build.rs b/src/tools/rust-analyzer/crates/proc-macro-srv/build.rs
new file mode 100644
index 000000000..a8c732f31
--- /dev/null
+++ b/src/tools/rust-analyzer/crates/proc-macro-srv/build.rs
@@ -0,0 +1,25 @@
+//! Determine rustc version `proc-macro-srv` (and thus the sysroot ABI) is
+//! build with and make it accessible at runtime for ABI selection.
+
+use std::{env, fs::File, io::Write, path::PathBuf, process::Command};
+
+fn main() {
+    let mut path = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    path.push("rustc_version.rs");
+    let mut f = File::create(&path).unwrap();
+
+    let rustc = env::var("RUSTC").expect("proc-macro-srv's build script expects RUSTC to be set");
+    let output = Command::new(rustc).arg("--version").output().expect("rustc --version must run");
+    let version_string = std::str::from_utf8(&output.stdout[..])
+        .expect("rustc --version output must be UTF-8")
+        .trim();
+
+    write!(
+        f,
+        "
+    #[allow(dead_code)]
+    pub(crate) const RUSTC_VERSION_STRING: &str = {version_string:?};
+    "
+    )
+    .unwrap();
+}