From 52808cef25e8404488e5e8dec9330c90b59df6d0 Mon Sep 17 00:00:00 2001
From: Jacob Hoffman-Andrews <github@hoffman-andrews.com>
Date: Fri, 31 Mar 2023 23:07:51 -0700
Subject: build.rs: print rustc stderr if exit status != 0

---
 build.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/build.rs b/build.rs
index e60672a761..79bec0ea4c 100644
--- a/build.rs
+++ b/build.rs
@@ -1,6 +1,7 @@
 use std::env;
 use std::process::Command;
 use std::str;
+use std::string::String;
 
 // List of cfgs this build script is allowed to set. The list is needed to support check-cfg, as we
 // need to know all the possible cfgs that this script will set. If you need to set another cfg
@@ -181,6 +182,13 @@ fn rustc_minor_nightly() -> (u32, bool) {
         .output()
         .ok()
         .expect("Failed to get rustc version");
+    if !output.status.success() {
+        panic!(
+            "failed to run rustc: {}",
+            String::from_utf8_lossy(output.stderr.as_slice())
+        );
+    }
+
     let version = otry!(str::from_utf8(&output.stdout).ok());
     let mut pieces = version.split('.');
 
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