From a640bce17d908a0691d53f22e5257353f694d9b6 Mon Sep 17 00:00:00 2001
From: q66 <daniel@octaforge.org>
Date: Sun, 3 May 2020 17:55:50 +0200
Subject: [PATCH 05/15] Prefer libgcc_eh over libunwind on musl

---
 src/libunwind/build.rs | 16 ++--------------
 src/libunwind/lib.rs   |  2 +-
 2 files changed, 3 insertions(+), 15 deletions(-)

diff --git a/src/libunwind/build.rs b/src/libunwind/build.rs
index a24808b3..a1250889 100644
--- a/library/unwind/build.rs
+++ b/library/unwind/build.rs
@@ -5,17 +5,14 @@
     let target = env::var("TARGET").expect("TARGET was not set");
 
     if cfg!(feature = "llvm-libunwind")
-        && ((target.contains("linux") && !target.contains("musl")) || target.contains("fuchsia"))
+        && (target.contains("linux") || target.contains("fuchsia"))
     {
         // Build the unwinding from libunwind C/C++ source code.
         llvm_libunwind::compile();
     } else if target.contains("x86_64-fortanix-unknown-sgx") {
         llvm_libunwind::compile();
     } else if target.contains("linux") {
-        if target.contains("musl") {
-            // linking for musl is handled in lib.rs
-            llvm_libunwind::compile();
-        } else if !target.contains("android") {
+        if !target.contains("android") {
             println!("cargo:rustc-link-lib=gcc_s");
         }
     } else if target.contains("freebsd") {
@@ -145,15 +142,6 @@
             cfg.file(root.join("src").join(src));
         }
 
-        if target_env == "musl" {
-            // use the same C compiler command to compile C++ code so we do not need to setup the
-            // C++ compiler env variables on the builders
-            cfg.cpp(false);
-            // linking for musl is handled in lib.rs
-            cfg.cargo_metadata(false);
-            println!("cargo:rustc-link-search=native={}", env::var("OUT_DIR").unwrap());
-        }
-
         cfg.compile("unwind");
     }
 }
diff --git a/src/libunwind/lib.rs b/src/libunwind/lib.rs
index 18d41be7..17f73d69 100644
--- a/library/unwind/src/lib.rs
+++ b/library/unwind/src/lib.rs
@@ -19,7 +19,7 @@ cfg_if::cfg_if! {
 }
 
 #[cfg(target_env = "musl")]
-#[link(name = "unwind", kind = "static", cfg(target_feature = "crt-static"))]
+#[link(name = "gcc_eh", cfg(target_feature = "crt-static"))]
 #[link(name = "gcc_s", cfg(not(target_feature = "crt-static")))]
 extern "C" {}
 
-- 
2.26.2