Fix warnings in tests

Author: antoyo

tests/run/asm.rs

@@ -16,6 +16,7 @@ add_asm:
      ret"
 );
 
+#[cfg(target_arch = "x86_64")]
 extern "C" {
     fn add_asm(a: i64, b: i64) -> i64;
 }

tests/run/float.rs

@@ -3,8 +3,6 @@
 // Run-time:
 //   status: 0
 
-#![feature(const_black_box)]
-
 fn main() {
     use std::hint::black_box;
 
@@ -15,14 +13,14 @@ fn main() {
         }};
     }
 
-    check!(i32, (black_box(0.0f32) as i32));
+    check!(i32, black_box(0.0f32) as i32);
 
-    check!(u64, (black_box(f32::NAN) as u64));
-    check!(u128, (black_box(f32::NAN) as u128));
+    check!(u64, black_box(f32::NAN) as u64);
+    check!(u128, black_box(f32::NAN) as u128);
 
-    check!(i64, (black_box(f64::NAN) as i64));
-    check!(u64, (black_box(f64::NAN) as u64));
+    check!(i64, black_box(f64::NAN) as i64);
+    check!(u64, black_box(f64::NAN) as u64);
 
-    check!(i16, (black_box(f32::MIN) as i16));
-    check!(i16, (black_box(f32::MAX) as i16));
+    check!(i16, black_box(f32::MIN) as i16);
+    check!(i16, black_box(f32::MAX) as i16);
 }

tests/run/int.rs

@@ -3,8 +3,6 @@
 // Run-time:
 //   status: 0
 
-#![feature(const_black_box)]
-
 fn main() {
     use std::hint::black_box;
 

tests/run/volatile.rs

@@ -5,13 +5,14 @@
 
 use std::mem::MaybeUninit;
 
+#[allow(dead_code)]
 #[derive(Debug)]
 struct Struct {
     pointer: *const (),
     func: unsafe fn(*const ()),
 }
 
-fn func(ptr: *const ()) {
+fn func(_ptr: *const ()) {
 }
 
 fn main() {

tests/run/volatile2.rs

@@ -6,8 +6,6 @@
 mod libc {
     #[link(name = "c")]
     extern "C" {
-        pub fn puts(s: *const u8) -> i32;
-
         pub fn sigaction(signum: i32, act: *const sigaction, oldact: *mut sigaction) -> i32;
         pub fn mmap(addr: *mut (), len: usize, prot: i32, flags: i32, fd: i32, offset: i64) -> *mut ();
         pub fn mprotect(addr: *mut (), len: usize, prot: i32) -> i32;
@@ -61,7 +59,7 @@ fn main() {
             panic!("error: mmap failed");
         }
 
-        let p_count = (&mut COUNT) as *mut u32;
+        let p_count = (&raw mut COUNT) as *mut u32;
         p_count.write_volatile(0);
 
         // Trigger segfaults
@@ -94,7 +92,7 @@ fn main() {
 }
 
 unsafe extern "C" fn segv_handler(_: i32, _: *mut (), _: *mut ()) {
-    let p_count = (&mut COUNT) as *mut u32;
+    let p_count = (&raw mut COUNT) as *mut u32;
     p_count.write_volatile(p_count.read_volatile() + 1);
     let count = p_count.read_volatile();