ARMv7-R: implement Sync for Pool

.travis.yml

@@ -10,6 +10,10 @@ matrix:
     - env: TARGET=x86_64-unknown-linux-gnu
       rust: nightly
 
+    - env: TARGET=armv7r-none-eabi
+      rust: nightly
+      if: branch != master
+
     - env: TARGET=thumbv6m-none-eabi
       rust: nightly
       if: branch != master

build.rs

@@ -11,6 +11,8 @@ fn main() -> Result<(), Box<Error>> {
         println!("cargo:rustc-cfg=armv7m");
     } else if target.starts_with("thumbv7em-") {
         println!("cargo:rustc-cfg=armv7m");
+    } else if target.starts_with("armv7r-") {
+        println!("cargo:rustc-cfg=armv7r");
     }
 
     Ok(())

src/pool/mod.rs

@@ -178,7 +178,7 @@ pub struct Pool<T> {
 // NOTE: Here we lie about `Pool` implementing `Sync` on x86_64. This is not true but it lets us
 // test the `pool!` and `singleton::Pool` abstractions. We just have to be careful not to use the
 // pool in a multi-threaded context
-#[cfg(any(armv7m, test))]
+#[cfg(any(armv7m, armv7r, test))]
 unsafe impl<T> Sync for Pool<T> {}
 
 unsafe impl<T> Send for Pool<T> {}

src/pool/singleton.rs

@@ -15,7 +15,7 @@ use as_slice::{AsMutSlice, AsSlice};
 use super::{Init, Uninit};
 
 /// Instantiates a pool as a global singleton
-#[cfg(any(armv7m, test))]
+#[cfg(any(armv7m, armv7r, test))]
 #[macro_export]
 macro_rules! pool {
     ($ident:ident: $ty:ty) => {