From: Jakub Jirutka <jakub@jirutka.cz>
Date: Thu, 04 Aug 2016 17:53:00 +0200
Subject: [PATCH] Do not link musl statically

Static linking of rustc on Alpine doesn't work yet.

This patch is ported from
https://gist.github.com/japaric/52b8816a4c86f5a4699bcc50ebc3e020.

--- a/src/bootstrap/build/sanity.rs
+++ b/src/bootstrap/build/sanity.rs
@@ -97,26 +91,6 @@
             panic!("the iOS target is only supported on OSX");
         }
 
-        // Make sure musl-root is valid if specified
-        if target.contains("musl") && (target.contains("x86_64") || target.contains("i686")) {
-            match build.config.musl_root {
-                Some(ref root) => {
-                    if fs::metadata(root.join("lib/libc.a")).is_err() {
-                        panic!("couldn't find libc.a in musl dir: {}",
-                               root.join("lib").display());
-                    }
-                    if fs::metadata(root.join("lib/libunwind.a")).is_err() {
-                        panic!("couldn't find libunwind.a in musl dir: {}",
-                               root.join("lib").display());
-                    }
-                }
-                None => {
-                    panic!("when targeting MUSL the build.musl-root option \
-                            must be specified in config.toml")
-                }
-            }
-        }
-
         if target.contains("msvc") {
             // There are three builds of cmake on windows: MSVC, MinGW, and
             // Cygwin. The Cygwin build does not have generators for Visual
--- a/src/liblibc/src/unix/mod.rs
+++ b/src/liblibc/src/unix/mod.rs
@@ -187,11 +187,6 @@
     } else if #[cfg(all(not(stdbuild), feature = "use_std"))] {
         // cargo build, don't pull in anything extra as the libstd  dep
         // already pulls in all libs.
-    } else if #[cfg(any(all(target_env = "musl", not(target_arch = "mips")),
-                        target_env = "musleabi",
-                        target_env = "musleabihf"))] {
-        #[link(name = "c", kind = "static")]
-        extern {}
     } else if #[cfg(target_os = "emscripten")] {
         #[link(name = "c")]
         extern {}
--- a/src/librustc_back/target/x86_64_unknown_linux_musl.rs
+++ b/src/librustc_back/target/x86_64_unknown_linux_musl.rs
@@ -11,7 +11,7 @@
 use target::Target;
 
 pub fn target() -> Target {
-    let mut base = super::linux_musl_base::opts();
+    let mut base = super::linux_base::opts();
     base.cpu = "x86-64".to_string();
     base.max_atomic_width = 64;
     base.pre_link_args.push("-m64".to_string());
--- a/src/libunwind/build.rs
+++ b/src/libunwind/build.rs
@@ -16,9 +16,7 @@
     let target = env::var("TARGET").unwrap();

     if target.contains("linux") {
-        if target.contains("musl") && (target.contains("x86_64") || target.contains("i686")) {
-            println!("cargo:rustc-link-lib=static=unwind");
-        } else if !target.contains("android") {
+        if !target.contains("android") {
             println!("cargo:rustc-link-lib=gcc_s");
         }
     } else if target.contains("freebsd") {