1 files changed, 48 insertions, 0 deletions
diff --git a/library/unwind/build.rs b/library/unwind/build.rs
new file mode 100644
index 000000000..f88e6a924
--- /dev/null
+++ b/library/unwind/build.rs
@@ -0,0 +1,48 @@
+use std::env;
+
+fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+    let target = env::var("TARGET").expect("TARGET was not set");
+
+    if target.contains("android") {
+        let build = cc::Build::new();
+
+        // Since ndk r23 beta 3 `libgcc` was replaced with `libunwind` thus
+        // check if we have `libunwind` available and if so use it. Otherwise
+        // fall back to `libgcc` to support older ndk versions.
+        let has_unwind = build.is_flag_supported("-lunwind").expect("Unable to invoke compiler");
+
+        if has_unwind {
+            println!("cargo:rustc-link-lib=unwind");
+        } else {
+            println!("cargo:rustc-link-lib=gcc");
+        }
+
+        // Android's unwinding library depends on dl_iterate_phdr in `libdl`.
+        println!("cargo:rustc-link-lib=dl");
+    } else if target.contains("freebsd") {
+        println!("cargo:rustc-link-lib=gcc_s");
+    } else if target.contains("netbsd") {
+        println!("cargo:rustc-link-lib=gcc_s");
+    } else if target.contains("openbsd") {
+        if target.contains("sparc64") {
+            println!("cargo:rustc-link-lib=gcc");
+        } else {
+            println!("cargo:rustc-link-lib=c++abi");
+        }
+    } else if target.contains("solaris") {
+        println!("cargo:rustc-link-lib=gcc_s");
+    } else if target.contains("illumos") {
+        println!("cargo:rustc-link-lib=gcc_s");
+    } else if target.contains("dragonfly") {
+        println!("cargo:rustc-link-lib=gcc_pic");
+    } else if target.ends_with("pc-windows-gnu") {
+        // This is handled in the target spec with late_link_args_[static|dynamic]
+    } else if target.contains("uwp-windows-gnu") {
+        println!("cargo:rustc-link-lib=unwind");
+    } else if target.contains("haiku") {
+        println!("cargo:rustc-link-lib=gcc_s");
+    } else if target.contains("redox") {
+        // redox is handled in lib.rs
+    }
+}