Linking with libatomic on armv6-linux

Author: notorca

libmimalloc-sys/build.rs

@@ -9,6 +9,7 @@ fn main() {
 
     let target_os = env::var("CARGO_CFG_TARGET_OS").expect("target_os not defined!");
     let target_family = env::var("CARGO_CFG_TARGET_FAMILY").expect("target_family not defined!");
+    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").expect("target_arch not defined!");
 
     if env::var_os("CARGO_FEATURE_OVERRIDE").is_some() {
         // Overriding malloc is only available on windows in shared mode, but we
@@ -53,4 +54,9 @@ fn main() {
     }
 
     build.compile("mimalloc");
+
+    // on armv6 we need to link with libatomic
+    if target_os == "linux" && target_arch == "arm" {
+        println!("cargo:rustc-link-lib=dylib=atomic");
+    }
 }