Auto merge of #80818 - 12101111:system-libunwind, r=Mark-Simulacrum

Don't build in-tree llvm-libunwind if system-llvm-libunwind is enable When "system-llvm-libunwind" is enabled, some target eg. musl still build in-tree llvm-libunwind which is useless.
rust-lang · Jan 11, 2021 · 00c5c39 · 00c5c39
2 parents 26d451f + 5de0680
commit 00c5c39
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/library/unwind/build.rs b/library/unwind/build.rs
@@ -4,6 +4,10 @@ fn main() {
     println!("cargo:rerun-if-changed=build.rs");
     let target = env::var("TARGET").expect("TARGET was not set");
 
+    if cfg!(feature = "system-llvm-libunwind") {
+        return;
+    }
+
     if cfg!(feature = "llvm-libunwind")
         && ((target.contains("linux") && !target.contains("musl")) || target.contains("fuchsia"))
     {