new file mode 100644
@@ -0,0 +1,90 @@
+Detect and fetch custom target configurations when rustc is
+bootstrapped in rust oe-selftest.
+
+Upstream-Status: Backport [https://github.com/rust-lang/rust/pull/119619/commits/26c71cbcf1a9bce6ceb962d753c467d098f63cf6]
+
+Signed-off-by: onur-ozkan <work@onurozkan.dev>
+Signed-off-by: Yash Shinde <Yash.Shinde@windriver.com>
+---
+diff --git a/src/tools/compiletest/src/common.rs b/src/tools/compiletest/src/common.rs
+index e85f6319936..c45c0b3c652 100644
+--- a/src/tools/compiletest/src/common.rs
++++ b/src/tools/compiletest/src/common.rs
+@@ -479,6 +479,7 @@ fn new(config: &Config) -> TargetCfgs {
+ let mut targets: HashMap<String, TargetCfg> = serde_json::from_str(&rustc_output(
+ config,
+ &["--print=all-target-specs-json", "-Zunstable-options"],
++ Default::default(),
+ ))
+ .unwrap();
+
+@@ -491,16 +492,33 @@ fn new(config: &Config) -> TargetCfgs {
+ let mut all_families = HashSet::new();
+ let mut all_pointer_widths = HashSet::new();
+
+- // Handle custom target specs, which are not included in `--print=all-target-specs-json`.
+- if config.target.ends_with(".json") {
+- targets.insert(
+- config.target.clone(),
+- serde_json::from_str(&rustc_output(
+- config,
+- &["--print=target-spec-json", "-Zunstable-options", "--target", &config.target],
+- ))
+- .unwrap(),
+- );
++ // If current target is not included in the `--print=all-target-specs-json` output,
++ // we check whether it is a custom target from the user or a synthetic target from bootstrap.
++ if !targets.contains_key(&config.target) {
++ let mut envs: HashMap<String, String> = HashMap::new();
++
++ if let Ok(t) = std::env::var("RUST_TARGET_PATH") {
++ envs.insert("RUST_TARGET_PATH".into(), t);
++ }
++
++ // This returns false only when the target is neither a synthetic target
++ // nor a custom target from the user, indicating it is most likely invalid.
++ if config.target.ends_with(".json") || !envs.is_empty() {
++ targets.insert(
++ config.target.clone(),
++ serde_json::from_str(&rustc_output(
++ config,
++ &[
++ "--print=target-spec-json",
++ "-Zunstable-options",
++ "--target",
++ &config.target,
++ ],
++ envs,
++ ))
++ .unwrap(),
++ );
++ }
+ }
+
+ for (target, cfg) in targets.iter() {
+@@ -545,7 +563,9 @@ fn get_current_target_config(
+ // code below extracts them from `--print=cfg`: make sure to only override fields that can
+ // actually be changed with `-C` flags.
+ for config in
+- rustc_output(config, &["--print=cfg", "--target", &config.target]).trim().lines()
++ rustc_output(config, &["--print=cfg", "--target", &config.target], Default::default())
++ .trim()
++ .lines()
+ {
+ let (name, value) = config
+ .split_once("=\"")
+@@ -624,11 +644,12 @@ pub enum Endian {
+ Big,
+ }
+
+-fn rustc_output(config: &Config, args: &[&str]) -> String {
++fn rustc_output(config: &Config, args: &[&str], envs: HashMap<String, String>) -> String {
+ let mut command = Command::new(&config.rustc_path);
+ add_dylib_path(&mut command, iter::once(&config.compile_lib_path));
+ command.args(&config.target_rustcflags).args(args);
+ command.env("RUSTC_BOOTSTRAP", "1");
++ command.envs(envs);
+
+ let output = match command.output() {
+ Ok(output) => output,
+