Move the stack size value for L4Re to the min_stack_size function

Author: humenda

src/libstd/sys/unix/thread.rs

@@ -53,10 +53,6 @@ impl Thread {
 
         let stack_size = cmp::max(stack, min_stack_size(&attr));
 
-        // L4Re only supports a maximum of 1Mb per default.
-        #[cfg(target_os = "l4re")]
-        let stack_size = cmp::min(stack_size, 1024 * 1024);
-
         match pthread_attr_setstacksize(&mut attr,
                                         stack_size) {
             0 => {}

src/libstd/sys_common/util.rs

@@ -22,7 +22,12 @@ pub fn min_stack() -> usize {
         n => return n - 1,
     }
     let amt = env::var("RUST_MIN_STACK").ok().and_then(|s| s.parse().ok());
+    #[cfg(not(target_os = "l4re"))]
     let amt = amt.unwrap_or(2 * 1024 * 1024);
+    // L4Re only supports a maximum of 1Mb per default.
+    #[cfg(target_os = "l4re")]
+    let amt = amt.unwrap_or(1024 * 1024);
+
     // 0 is our sentinel value, so ensure that we'll never see 0 after
     // initialization has run
     MIN.store(amt + 1, Ordering::SeqCst);