target: add -Zunstable-options when querying cfg

DeepeshWR · DeepeshWR · commit 4de826522fce · 2026-04-20T21:52:26.000-07:00
Since Rust 1.95,invoking rustc with `--target` requires `-Zunstable-options` when used with custom JSON targets. Without this flag, the command fails. Reference: rust-lang/rust@b4e645f rust-lang/rust@8563312 Signed-off-by: Deepesh Varatharajan <Deepesh.Varatharajan@windriver.com>
diff --git a/src/target.rs b/src/target.rs
@@ -32,6 +32,7 @@ impl Target {
         let target = target.as_ref();
 
         cmd.arg("--print").arg("cfg");
+        cmd.arg("-Zunstable-options");
         if let Some(target) = target {
             cmd.arg("--target").arg(target);
         }

Original file line number	Diff line number	Diff line change
`@@ -32,6 +32,7 @@ impl Target {`
`32`	`32`	`let target = target.as_ref();`
`33`	`33`
`34`	`34`	`cmd.arg("--print").arg("cfg");`
	`35`	`+ cmd.arg("-Zunstable-options");`
`35`	`36`	`if let Some(target) = target {`
`36`	`37`	`cmd.arg("--target").arg(target);`
`37`	`38`	`}`