Auto merge of #56818 - kennytm:rollup-2, r=kennytm

Rollup of 14 pull requests (first batch)

Successful merges:

 - #56562 (Update libc version required by rustc)
 - #56609 (Unconditionally emit the target-cpu LLVM attribute.)
 - #56637 (rustdoc: Fix local reexports of proc macros)
 - #56658 (Add non-panicking `maybe_new_parser_from_file` variant)
 - #56695 (Fix irrefutable matches on integer ranges)
 - #56699 (Use a `newtype_index!` within `Symbol`.)
 - #56702 ([self-profiler] Add column for percent of total time)
 - #56708 (Remove some unnecessary feature gates)
 - #56709 (Remove unneeded extra chars to reduce search-index size)
 - #56744 (specialize: remove Boxes used by Children::insert)
 - #56748 (Update panic message to be clearer about env-vars)
 - #56749 (x86: Add the `adx` target feature to whitelist)
 - #56756 (Disable btree pretty-printers on older gdbs)
 - #56789 (rustc: Add an unstable `simd_select_bitmask` intrinsic)

r? @ghost

12 files changed, 3 insertions, 27 deletions

diff --git a/src/libstd/io/lazy.rs b/src/libstd/io/lazy.rs
index c2aaeb98907..24965ff6931 100644
--- a/src/libstd/io/lazy.rs
+++ b/src/libstd/io/lazy.rs
@@ -26,7 +26,6 @@ const fn done<T>() -> *mut Arc<T> { 1_usize as *mut _ }
 unsafe impl<T> Sync for Lazy<T> {}
 
 impl<T> Lazy<T> {
-    #[unstable(feature = "sys_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn new() -> Lazy<T> {
         Lazy {
             lock: Mutex::new(),
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 7c43ba5afa7..0febbe5694b 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -271,6 +271,7 @@
 #![feature(libc)]
 #![feature(link_args)]
 #![feature(linkage)]
+#![cfg_attr(not(stage0), feature(min_const_unsafe_fn))]
 #![feature(needs_panic_runtime)]
 #![feature(never_type)]
 #![feature(nll)]
diff --git a/src/libstd/panicking.rs b/src/libstd/panicking.rs
index 6b47ba6d1cb..b6180fbeb50 100644
--- a/src/libstd/panicking.rs
+++ b/src/libstd/panicking.rs
@@ -209,7 +209,8 @@ fn default_hook(info: &PanicInfo) {
             if let Some(format) = log_backtrace {
                 let _ = backtrace::print(err, format);
             } else if FIRST_PANIC.compare_and_swap(true, false, Ordering::SeqCst) {
-                let _ = writeln!(err, "note: Run with `RUST_BACKTRACE=1` for a backtrace.");
+                let _ = writeln!(err, "note: Run with `RUST_BACKTRACE=1` \
+                                       environment variable to display a backtrace.");
             }
         }
     };
diff --git a/src/libstd/sys/sgx/abi/mem.rs b/src/libstd/sys/sgx/abi/mem.rs
index 508f2ff4d4f..bf32c712216 100644
--- a/src/libstd/sys/sgx/abi/mem.rs
+++ b/src/libstd/sys/sgx/abi/mem.rs
@@ -34,13 +34,6 @@ fn image_base() -> u64 {
     base
 }
 
-pub fn is_enclave_range(p: *const u8, len: usize) -> bool {
-    let start=p as u64;
-    let end=start + (len as u64);
-    start >= image_base() &&
-        end <= image_base() + (unsafe { ENCLAVE_SIZE } as u64) // unsafe ok: link-time constant
-}
-
 pub fn is_user_range(p: *const u8, len: usize) -> bool {
     let start=p as u64;
     let end=start + (len as u64);
diff --git a/src/libstd/sys/sgx/abi/usercalls/mod.rs b/src/libstd/sys/sgx/abi/usercalls/mod.rs
index 2bc32c9fefb..d1d180e4825 100644
--- a/src/libstd/sys/sgx/abi/usercalls/mod.rs
+++ b/src/libstd/sys/sgx/abi/usercalls/mod.rs
@@ -33,14 +33,6 @@ pub fn read(fd: Fd, buf: &mut [u8]) -> IoResult<usize> {
     }
 }
 
-pub fn read_alloc(fd: Fd) -> IoResult<Vec<u8>> {
-    unsafe {
-        let mut userbuf = alloc::User::<ByteBuffer>::uninitialized();
-        raw::read_alloc(fd, userbuf.as_raw_mut_ptr()).from_sgx_result()?;
-        Ok(copy_user_buffer(&userbuf))
-    }
-}
-
 pub fn write(fd: Fd, buf: &[u8]) -> IoResult<usize> {
     unsafe {
         let userbuf = alloc::User::new_from_enclave(buf);
diff --git a/src/libstd/sys/sgx/condvar.rs b/src/libstd/sys/sgx/condvar.rs
index d3e8165f3df..940f50f25b8 100644
--- a/src/libstd/sys/sgx/condvar.rs
+++ b/src/libstd/sys/sgx/condvar.rs
@@ -18,7 +18,6 @@ pub struct Condvar {
 }
 
 impl Condvar {
-    #[unstable(feature = "sgx_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn new() -> Condvar {
         Condvar { inner: SpinMutex::new(WaitVariable::new(())) }
     }
diff --git a/src/libstd/sys/sgx/mutex.rs b/src/libstd/sys/sgx/mutex.rs
index 663361162bc..994cf91eea0 100644
--- a/src/libstd/sys/sgx/mutex.rs
+++ b/src/libstd/sys/sgx/mutex.rs
@@ -20,7 +20,6 @@ pub struct Mutex {
 
 // Implementation according to “Operating Systems: Three Easy Pieces”, chapter 28
 impl Mutex {
-    #[unstable(feature = "sgx_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn new() -> Mutex {
         Mutex { inner: SpinMutex::new(WaitVariable::new(false)) }
     }
@@ -79,7 +78,6 @@ pub struct ReentrantMutex {
 }
 
 impl ReentrantMutex {
-    #[unstable(feature = "sgx_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn uninitialized() -> ReentrantMutex {
         ReentrantMutex {
             inner: SpinMutex::new(WaitVariable::new(ReentrantLock { owner: None, count: 0 }))
diff --git a/src/libstd/sys/sgx/rwlock.rs b/src/libstd/sys/sgx/rwlock.rs
index 7b6970b825f..a1551dbb53b 100644
--- a/src/libstd/sys/sgx/rwlock.rs
+++ b/src/libstd/sys/sgx/rwlock.rs
@@ -21,7 +21,6 @@ pub struct RWLock {
 //unsafe impl Sync for RWLock {} // FIXME
 
 impl RWLock {
-    #[unstable(feature = "sgx_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn new() -> RWLock {
         RWLock {
             readers: SpinMutex::new(WaitVariable::new(None)),
diff --git a/src/libstd/sys/sgx/waitqueue.rs b/src/libstd/sys/sgx/waitqueue.rs
index ec1135ba30c..ef0def13eee 100644
--- a/src/libstd/sys/sgx/waitqueue.rs
+++ b/src/libstd/sys/sgx/waitqueue.rs
@@ -50,7 +50,6 @@ pub struct WaitVariable<T> {
 }
 
 impl<T> WaitVariable<T> {
-    #[unstable(feature = "sgx_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn new(var: T) -> Self {
         WaitVariable {
             queue: WaitQueue::new(),
@@ -137,7 +136,6 @@ impl<'a, T> Drop for WaitGuard<'a, T> {
 }
 
 impl WaitQueue {
-    #[unstable(feature = "sgx_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn new() -> Self {
         WaitQueue {
             inner: UnsafeList::new()
@@ -255,7 +253,6 @@ mod unsafe_list {
     }
 
     impl<T> UnsafeList<T> {
-        #[unstable(feature = "sgx_internals", issue = "0")] // FIXME: min_const_fn
         pub const fn new() -> Self {
             unsafe {
                 UnsafeList {
diff --git a/src/libstd/sys_common/condvar.rs b/src/libstd/sys_common/condvar.rs
index 16bf0803a8d..b6f29dd5fc3 100644
--- a/src/libstd/sys_common/condvar.rs
+++ b/src/libstd/sys_common/condvar.rs
@@ -25,7 +25,6 @@ impl Condvar {
     ///
     /// Behavior is undefined if the condition variable is moved after it is
     /// first used with any of the functions below.
-    #[unstable(feature = "sys_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn new() -> Condvar { Condvar(imp::Condvar::new()) }
 
     /// Prepares the condition variable for use.
diff --git a/src/libstd/sys_common/mutex.rs b/src/libstd/sys_common/mutex.rs
index 87684237638..c6d531c7a1a 100644
--- a/src/libstd/sys_common/mutex.rs
+++ b/src/libstd/sys_common/mutex.rs
@@ -27,7 +27,6 @@ impl Mutex {
     /// Also, until `init` is called, behavior is undefined if this
     /// mutex is ever used reentrantly, i.e., `raw_lock` or `try_lock`
     /// are called by the thread currently holding the lock.
-    #[unstable(feature = "sys_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn new() -> Mutex { Mutex(imp::Mutex::new()) }
 
     /// Prepare the mutex for use.
diff --git a/src/libstd/sys_common/rwlock.rs b/src/libstd/sys_common/rwlock.rs
index a430c254d3c..71a4f01ec4c 100644
--- a/src/libstd/sys_common/rwlock.rs
+++ b/src/libstd/sys_common/rwlock.rs
@@ -22,7 +22,6 @@ impl RWLock {
     ///
     /// Behavior is undefined if the reader-writer lock is moved after it is
     /// first used with any of the functions below.
-    #[unstable(feature = "sys_internals", issue = "0")] // FIXME: min_const_fn
     pub const fn new() -> RWLock { RWLock(imp::RWLock::new()) }
 
     /// Acquires shared access to the underlying lock, blocking the current