From e74f73544f29fe3559081250b9a657a36bc860eb Mon Sep 17 00:00:00 2001
From: Pietro Albini <pietro.albini@ferrous-systems.com>
Date: Wed, 14 Dec 2022 14:41:50 +0100
Subject: support extra check-cfg

---
 build.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/build.rs b/build.rs
index cb70d6e238..43a5d890d1 100644
--- a/build.rs
+++ b/build.rs
@@ -29,6 +29,13 @@ const ALLOWED_CFGS: &[&str] = &[
     "libc_union",
 ];
 
+// Extra values to allow for check-cfg.
+const CHECK_CFG_EXTRA: &[(&str, &[&str])] = &[
+    ("target_os", &["switch", "aix", "ohos"]),
+    ("target_env", &["illumos", "wasi", "aix", "ohos"]),
+    ("target_arch", &["loongarch64"]),
+];
+
 fn main() {
     // Avoid unnecessary re-building.
     println!("cargo:rerun-if-changed=build.rs");
@@ -151,6 +158,10 @@ fn main() {
         for cfg in ALLOWED_CFGS {
             println!("cargo:rustc-check-cfg=values({})", cfg);
         }
+        for (name, values) in CHECK_CFG_EXTRA {
+            let values = values.join("\",\"");
+            println!("cargo:rustc-check-cfg=values({},\"{}\")", name, values);
+        }
     }
 }
 
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