Auto merge of #64369 - Centril:rollup-g875ozi, r=Centril

Rollup of 6 pull requests

Successful merges:

 - #64060 (Improve hygiene of `alloc::format!`)
 - #64072 (Replace file_stem by file_name in rustdoc markdown)
 - #64129 (vxWorks: set DEFAULT_MIN_STACK_SIZE to 256K and use min_stack to pass initial stack size to rtpSpawn)
 - #64188 (rustc: Allow the cdylib crate type with wasm32-wasi)
 - #64326 (Fixed documentation within c_str::from_ptr)
 - #64349 (documentation for AtomicPtr CAS operations)

Failed merges:

r? @ghost

9 files changed, 21 insertions, 13 deletions

diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 4a48945adc3..370e5cf4b30 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -171,3 +171,9 @@ pub mod vec;
 mod std {
     pub use core::ops; // RangeFull
 }
+
+#[doc(hidden)]
+#[unstable(feature = "liballoc_internals", issue = "0", reason = "implementation detail")]
+pub mod __export {
+    pub use core::format_args;
+}
diff --git a/src/liballoc/macros.rs b/src/liballoc/macros.rs
index 0b5e186d4c7..2f2cdc39c63 100644
--- a/src/liballoc/macros.rs
+++ b/src/liballoc/macros.rs
@@ -98,5 +98,5 @@ macro_rules! vec {
 #[macro_export]
 #[stable(feature = "rust1", since = "1.0.0")]
 macro_rules! format {
-    ($($arg:tt)*) => ($crate::fmt::format(::core::format_args!($($arg)*)))
+    ($($arg:tt)*) => ($crate::fmt::format($crate::__export::format_args!($($arg)*)))
 }
diff --git a/src/libcore/sync/atomic.rs b/src/libcore/sync/atomic.rs
index 8dfb19fa032..a73111571c2 100644
--- a/src/libcore/sync/atomic.rs
+++ b/src/libcore/sync/atomic.rs
@@ -979,9 +979,8 @@ impl<T> AtomicPtr<T> {
     /// let some_ptr  = AtomicPtr::new(ptr);
     ///
     /// let other_ptr   = &mut 10;
-    /// let another_ptr = &mut 10;
     ///
-    /// let value = some_ptr.compare_and_swap(other_ptr, another_ptr, Ordering::Relaxed);
+    /// let value = some_ptr.compare_and_swap(ptr, other_ptr, Ordering::Relaxed);
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
@@ -1021,9 +1020,8 @@ impl<T> AtomicPtr<T> {
     /// let some_ptr  = AtomicPtr::new(ptr);
     ///
     /// let other_ptr   = &mut 10;
-    /// let another_ptr = &mut 10;
     ///
-    /// let value = some_ptr.compare_exchange(other_ptr, another_ptr,
+    /// let value = some_ptr.compare_exchange(ptr, other_ptr,
     ///                                       Ordering::SeqCst, Ordering::Relaxed);
     /// ```
     #[inline]
diff --git a/src/librustc_target/spec/wasm32_wasi.rs b/src/librustc_target/spec/wasm32_wasi.rs
index bb33493a773..86978c05b15 100644
--- a/src/librustc_target/spec/wasm32_wasi.rs
+++ b/src/librustc_target/spec/wasm32_wasi.rs
@@ -97,6 +97,10 @@ pub fn target() -> Result<Target, String> {
     options.crt_static_default = true;
     options.crt_static_respected = true;
 
+    // Allow `+crt-static` to create a "cdylib" output which is just a wasm file
+    // without a main function.
+    options.crt_static_allows_dylibs = true;
+
     Ok(Target {
         llvm_target: "wasm32-wasi".to_string(),
         target_endian: "little".to_string(),
diff --git a/src/librustdoc/markdown.rs b/src/librustdoc/markdown.rs
index b06b368469f..8431271e62d 100644
--- a/src/librustdoc/markdown.rs
+++ b/src/librustdoc/markdown.rs
@@ -43,7 +43,7 @@ pub fn render(
     edition: Edition
 ) -> i32 {
     let mut output = options.output;
-    output.push(input.file_stem().unwrap());
+    output.push(input.file_name().unwrap());
     output.set_extension("html");
 
     let mut css = String::new();
diff --git a/src/libstd/ffi/c_str.rs b/src/libstd/ffi/c_str.rs
index 65f4e0cafe0..bb346fb4db5 100644
--- a/src/libstd/ffi/c_str.rs
+++ b/src/libstd/ffi/c_str.rs
@@ -935,8 +935,10 @@ impl CStr {
     /// Wraps a raw C string with a safe C string wrapper.
     ///
     /// This function will wrap the provided `ptr` with a `CStr` wrapper, which
-    /// allows inspection and interoperation of non-owned C strings. This method
-    /// is unsafe for a number of reasons:
+    /// allows inspection and interoperation of non-owned C strings. The total
+    /// size of the raw C string must be smaller than `isize::MAX` **bytes**
+    /// in memory due to calling the `slice::from_raw_parts` function.
+    /// This method is unsafe for a number of reasons:
     ///
     /// * There is no guarantee to the validity of `ptr`.
     /// * The returned lifetime is not guaranteed to be the actual lifetime of
diff --git a/src/libstd/sys/vxworks/fast_thread_local.rs b/src/libstd/sys/vxworks/fast_thread_local.rs
index 2e021980778..8b55939b8e5 100644
--- a/src/libstd/sys/vxworks/fast_thread_local.rs
+++ b/src/libstd/sys/vxworks/fast_thread_local.rs
@@ -1,5 +1,3 @@
-// Copyright (c) 2019 Wind River Systems, Inc.
-
 #![cfg(target_thread_local)]
 #![unstable(feature = "thread_local_internals", issue = "0")]
 
diff --git a/src/libstd/sys/vxworks/process/process_vxworks.rs b/src/libstd/sys/vxworks/process/process_vxworks.rs
index b07966fa206..8780df17a1c 100644
--- a/src/libstd/sys/vxworks/process/process_vxworks.rs
+++ b/src/libstd/sys/vxworks/process/process_vxworks.rs
@@ -5,6 +5,7 @@ use crate::sys;
 use crate::sys::cvt;
 use crate::sys::process::rtp;
 use crate::sys::process::process_common::*;
+use crate::sys_common::thread;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Command
@@ -57,8 +58,7 @@ impl Command {
                 self.get_argv().as_ptr() as *const _, // argv
                 *sys::os::environ() as *const *const c_char,
                 100 as c_int,                         // initial priority
-                0x16000,                                    // initial stack size. 0 defaults
-                                                      // to 0x4000 in 32 bit and 0x8000 in 64 bit
+                thread::min_stack(),                  // initial stack size.
                 0,                                    // options
                 0                                     // task options
             );
diff --git a/src/libstd/sys/vxworks/thread.rs b/src/libstd/sys/vxworks/thread.rs
index ef896f6a6e8..e4396b05c00 100644
--- a/src/libstd/sys/vxworks/thread.rs
+++ b/src/libstd/sys/vxworks/thread.rs
@@ -8,7 +8,7 @@ use crate::time::Duration;
 
 use crate::sys_common::thread::*;
 
-pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
+pub const DEFAULT_MIN_STACK_SIZE: usize = 0x40000; // 256K
 
 pub struct Thread {
     id: libc::pthread_t,