Auto merge of #220 - malbarbo:armv4t, r=alexcrichton

Use kernel user helpers for armv4t

Rename armv5te cfg to kernel_user_helpers and enable it for armv4t.

build.rs

@@ -52,8 +52,8 @@ fn main() {
     }
 
     // Only emit the ARM Linux atomic emulation on pre-ARMv6 architectures.
-    if llvm_target[0] == "armv5te" {
-        println!("cargo:rustc-cfg=armv5te")
+    if llvm_target[0] == "armv4t" || llvm_target[0] == "armv5te" {
+        println!("cargo:rustc-cfg=kernel_user_helpers")
     }
 }
 

src/lib.rs

@@ -52,7 +52,7 @@ pub mod mem;
 #[cfg(target_arch = "arm")]
 pub mod arm;
 
-#[cfg(all(armv5te, target_os = "linux", target_arch = "arm"))]
+#[cfg(all(kernel_user_helpers, target_os = "linux", target_arch = "arm"))]
 pub mod arm_linux;
 
 #[cfg(target_arch = "x86")]