Update usages of 'OSX' (and other old names) to 'macOS'.

As of last year with version 'Sierra', the Mac operating system is now
called 'macOS'.

41 files changed, 63 insertions, 63 deletions

diff --git a/RELEASES.md b/RELEASES.md
index 606936778c4..16257c3e9c0 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -5056,7 +5056,7 @@ Version 0.1  (2012-01-20)
 
    * Compiler works with the following configurations:
       * Linux: x86 and x86_64 hosts and targets
-      * MacOS: x86 and x86_64 hosts and targets
+      * macOS: x86 and x86_64 hosts and targets
       * Windows: x86 hosts and targets
 
    * Cross compilation / multi-target configuration supported.
diff --git a/src/bootstrap/bin/rustc.rs b/src/bootstrap/bin/rustc.rs
index a996240f616..ba85e81ff4f 100644
--- a/src/bootstrap/bin/rustc.rs
+++ b/src/bootstrap/bin/rustc.rs
@@ -182,7 +182,7 @@ fn main() {
         if env::var("RUSTC_RPATH") == Ok("true".to_string()) {
             let rpath = if target.contains("apple") {
 
-                // Note that we need to take one extra step on OSX to also pass
+                // Note that we need to take one extra step on macOS to also pass
                 // `-Wl,-instal_name,@rpath/...` to get things to work right. To
                 // do that we pass a weird flag to the compiler to get it to do
                 // so. Note that this is definitely a hack, and we should likely
diff --git a/src/bootstrap/check.rs b/src/bootstrap/check.rs
index 68b3623a53f..0d962bd3b0c 100644
--- a/src/bootstrap/check.rs
+++ b/src/bootstrap/check.rs
@@ -176,7 +176,7 @@ pub fn compiletest(build: &Build,
     cmd.arg("--docck-python").arg(build.python());
 
     if build.config.build.ends_with("apple-darwin") {
-        // Force /usr/bin/python on OSX for LLDB tests because we're loading the
+        // Force /usr/bin/python on macOS for LLDB tests because we're loading the
         // LLDB plugin's compiled module which only works with the system python
         // (namely not Homebrew-installed python)
         cmd.arg("--lldb-python").arg("/usr/bin/python");
diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 3459c1d2b84..4201475c60c 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -249,7 +249,7 @@ pub fn rustc(build: &Build, target: &str, compiler: &Compiler) {
         cargo.env("CFG_LLVM_ROOT", s);
     }
     // Building with a static libstdc++ is only supported on linux right now,
-    // not for MSVC or OSX
+    // not for MSVC or macOS
     if build.config.llvm_static_stdcpp &&
        !target.contains("windows") &&
        !target.contains("apple") {
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 618e4d67705..75a8b780248 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -846,7 +846,7 @@ impl Build {
                            .filter(|s| !s.starts_with("-O") && !s.starts_with("/O"))
                            .collect::<Vec<_>>();
 
-        // If we're compiling on OSX then we add a few unconditional flags
+        // If we're compiling on macOS then we add a few unconditional flags
         // indicating that we want libc++ (more filled out than libstdc++) and
         // we want to compile for 10.7. This way we can ensure that
         // LLVM/jemalloc/etc are all properly compiled.
diff --git a/src/bootstrap/sanity.rs b/src/bootstrap/sanity.rs
index bc439d6f782..235ce9360ef 100644
--- a/src/bootstrap/sanity.rs
+++ b/src/bootstrap/sanity.rs
@@ -151,10 +151,10 @@ pub fn check(build: &mut Build) {
     }
 
     for target in build.config.target.iter() {
-        // Can't compile for iOS unless we're on OSX
+        // Can't compile for iOS unless we're on macOS
         if target.contains("apple-ios") &&
            !build.config.build.contains("apple-darwin") {
-            panic!("the iOS target is only supported on OSX");
+            panic!("the iOS target is only supported on macOS");
         }
 
         // Make sure musl-root is valid if specified
diff --git a/src/doc/book/src/testing.md b/src/doc/book/src/testing.md
index 291c4481d55..b4f580fcdfb 100644
--- a/src/doc/book/src/testing.md
+++ b/src/doc/book/src/testing.md
@@ -147,7 +147,7 @@ And that's reflected in the summary line:
 test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured
 ```
 
-We also get a non-zero status code. We can use `$?` on OS X and Linux:
+We also get a non-zero status code. We can use `$?` on macOS and Linux:
 
 ```bash
 $ echo $?
diff --git a/src/liballoc_jemalloc/lib.rs b/src/liballoc_jemalloc/lib.rs
index a496ab870c6..a7a67ef76d4 100644
--- a/src/liballoc_jemalloc/lib.rs
+++ b/src/liballoc_jemalloc/lib.rs
@@ -30,7 +30,7 @@ pub use imp::*;
 mod imp {
     use libc::{c_int, c_void, size_t};
 
-    // Note that the symbols here are prefixed by default on OSX and Windows (we
+    // Note that the symbols here are prefixed by default on macOS and Windows (we
     // don't explicitly request it), and on Android and DragonFly we explicitly
     // request it as unprefixing cause segfaults (mismatches in allocators).
     extern "C" {
diff --git a/src/librustc/middle/cstore.rs b/src/librustc/middle/cstore.rs
index e9fb4632fa1..225d6fc9bb2 100644
--- a/src/librustc/middle/cstore.rs
+++ b/src/librustc/middle/cstore.rs
@@ -123,7 +123,7 @@ pub enum LinkagePreference {
 pub enum NativeLibraryKind {
     NativeStatic,    // native static library (.a archive)
     NativeStaticNobundle, // native static library, which doesn't get bundled into .rlibs
-    NativeFramework, // OSX-specific
+    NativeFramework, // macOS-specific
     NativeUnknown,   // default way to specify a dynamic library
 }
 
diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
index 5fff03dabce..d7a765fb822 100644
--- a/src/librustc/session/config.rs
+++ b/src/librustc/session/config.rs
@@ -971,7 +971,7 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
     always_encode_mir: bool = (false, parse_bool, [TRACKED],
           "encode MIR of all functions into the crate metadata"),
     osx_rpath_install_name: bool = (false, parse_bool, [TRACKED],
-          "pass `-install_name @rpath/...` to the OSX linker"),
+          "pass `-install_name @rpath/...` to the macOS linker"),
     sanitizer: Option<Sanitizer> = (None, parse_sanitizer, [TRACKED],
                                    "Use a sanitizer"),
 }
diff --git a/src/librustc_back/target/apple_base.rs b/src/librustc_back/target/apple_base.rs
index 21a2d4293df..3a551a2b124 100644
--- a/src/librustc_back/target/apple_base.rs
+++ b/src/librustc_back/target/apple_base.rs
@@ -13,12 +13,12 @@ use std::env;
 use target::TargetOptions;
 
 pub fn opts() -> TargetOptions {
-    // ELF TLS is only available in OSX 10.7+. If you try to compile for 10.6
+    // ELF TLS is only available in macOS 10.7+. If you try to compile for 10.6
     // either the linker will complain if it is used or the binary will end up
-    // segfaulting at runtime when run on 10.6. Rust by default supports OSX
+    // segfaulting at runtime when run on 10.6. Rust by default supports macOS
     // 10.7+, but there is a standard environment variable,
     // MACOSX_DEPLOYMENT_TARGET, which is used to signal targeting older
-    // versions of OSX. For example compiling on 10.10 with
+    // versions of macOS. For example compiling on 10.10 with
     // MACOSX_DEPLOYMENT_TARGET set to 10.6 will cause the linker to generate
     // warnings about the usage of ELF TLS.
     //
@@ -33,7 +33,7 @@ pub fn opts() -> TargetOptions {
     }).unwrap_or((10, 7));
 
     TargetOptions {
-        // OSX has -dead_strip, which doesn't rely on function_sections
+        // macOS has -dead_strip, which doesn't rely on function_sections
         function_sections: false,
         dynamic_linking: true,
         executables: true,
diff --git a/src/librustc_back/target/mod.rs b/src/librustc_back/target/mod.rs
index 0c179469448..559418d2c4f 100644
--- a/src/librustc_back/target/mod.rs
+++ b/src/librustc_back/target/mod.rs
@@ -318,8 +318,8 @@ pub struct TargetOptions {
     /// Whether the target toolchain is like OpenBSD's.
     /// Only useful for compiling against OpenBSD, for configuring abi when returning a struct.
     pub is_like_openbsd: bool,
-    /// Whether the target toolchain is like OSX's. Only useful for compiling against iOS/OS X, in
-    /// particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
+    /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
+    /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
     pub is_like_osx: bool,
     /// Whether the target toolchain is like Solaris's.
     /// Only useful for compiling against Illumos/Solaris,
diff --git a/src/librustc_metadata/creader.rs b/src/librustc_metadata/creader.rs
index 49dcffb4830..63c14a0035f 100644
--- a/src/librustc_metadata/creader.rs
+++ b/src/librustc_metadata/creader.rs
@@ -99,7 +99,7 @@ fn register_native_lib(sess: &Session,
     }
     let is_osx = sess.target.target.options.is_like_osx;
     if lib.kind == cstore::NativeFramework && !is_osx {
-        let msg = "native frameworks are only available on OSX targets";
+        let msg = "native frameworks are only available on macOS targets";
         match span {
             Some(span) => span_err!(sess, span, E0455, "{}", msg),
             None => sess.err(msg),
diff --git a/src/librustc_metadata/diagnostics.rs b/src/librustc_metadata/diagnostics.rs
index d3a2b6f1683..fbdc4695cf8 100644
--- a/src/librustc_metadata/diagnostics.rs
+++ b/src/librustc_metadata/diagnostics.rs
@@ -27,7 +27,7 @@ name. Example:
 "##,
 
 E0455: r##"
-Linking with `kind=framework` is only supported when targeting OS X,
+Linking with `kind=framework` is only supported when targeting macOS,
 as frameworks are specific to that operating system.
 
 Erroneous code example:
diff --git a/src/librustc_metadata/encoder.rs b/src/librustc_metadata/encoder.rs
index 8ddc1642d9e..0c31e30671d 100644
--- a/src/librustc_metadata/encoder.rs
+++ b/src/librustc_metadata/encoder.rs
@@ -1404,7 +1404,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
 //
 // And here we run into yet another obscure archive bug: in which metadata
 // loaded from archives may have trailing garbage bytes. Awhile back one of
-// our tests was failing sporadically on the OSX 64-bit builders (both nopt
+// our tests was failing sporadically on the macOS 64-bit builders (both nopt
 // and opt) by having ebml generate an out-of-bounds panic when looking at
 // metadata.
 //
diff --git a/src/librustc_trans/back/link.rs b/src/librustc_trans/back/link.rs
index a1703b1c155..cf1e10b317b 100644
--- a/src/librustc_trans/back/link.rs
+++ b/src/librustc_trans/back/link.rs
@@ -583,7 +583,7 @@ fn link_rlib<'a>(sess: &'a Session,
             }
 
             // After adding all files to the archive, we need to update the
-            // symbol table of the archive. This currently dies on OSX (see
+            // symbol table of the archive. This currently dies on macOS (see
             // #11162), and isn't necessary there anyway
             if !sess.target.target.options.is_like_osx {
                 ab.update_symbols();
@@ -764,7 +764,7 @@ fn link_natively(sess: &Session,
     // pain to land PRs when they spuriously fail due to a segfault.
     //
     // The issue #38878 has some more debugging information on it as well, but
-    // this unfortunately looks like it's just a race condition in OSX's linker
+    // this unfortunately looks like it's just a race condition in macOS's linker
     // with some thread pool working in the background. It seems that no one
     // currently knows a fix for this so in the meantime we're left with this...
     info!("{:?}", &cmd);
@@ -841,7 +841,7 @@ fn link_natively(sess: &Session,
     }
 
 
-    // On OSX, debuggers need this utility to get run to do some munging of
+    // On macOS, debuggers need this utility to get run to do some munging of
     // the symbols
     if sess.target.target.options.is_like_osx && sess.opts.debuginfo != NoDebugInfo {
         match Command::new("dsymutil").arg(out_filename).output() {
diff --git a/src/librustc_trans/back/linker.rs b/src/librustc_trans/back/linker.rs
index 830d1d0d3a5..80801e8161c 100644
--- a/src/librustc_trans/back/linker.rs
+++ b/src/librustc_trans/back/linker.rs
@@ -139,7 +139,7 @@ impl<'a> Linker for GnuLinker<'a> {
                     .arg("-l").arg(lib)
                     .arg("-Wl,--no-whole-archive");
         } else {
-            // -force_load is the OSX equivalent of --whole-archive, but it
+            // -force_load is the macOS equivalent of --whole-archive, but it
             // involves passing the full path to the library to link.
             let mut v = OsString::from("-Wl,-force_load,");
             v.push(&archive::find_library(lib, search_path, &self.sess));
diff --git a/src/librustc_trans/back/symbol_names.rs b/src/librustc_trans/back/symbol_names.rs
index 20338e4f6af..fe58bc8f5f2 100644
--- a/src/librustc_trans/back/symbol_names.rs
+++ b/src/librustc_trans/back/symbol_names.rs
@@ -351,7 +351,7 @@ fn mangle<PI: Iterator<Item=InternedString>>(path: PI, hash: &str) -> String {
     // Follow C++ namespace-mangling style, see
     // http://en.wikipedia.org/wiki/Name_mangling for more info.
     //
-    // It turns out that on OSX you can actually have arbitrary symbols in
+    // It turns out that on macOS you can actually have arbitrary symbols in
     // function names (at least when given to LLVM), but this is not possible
     // when using unix's linker. Perhaps one day when we just use a linker from LLVM
     // we won't need to do this name mangling. The problem with name mangling is
diff --git a/src/librustc_trans/debuginfo/mod.rs b/src/librustc_trans/debuginfo/mod.rs
index 6933f158256..1d4aebf135b 100644
--- a/src/librustc_trans/debuginfo/mod.rs
+++ b/src/librustc_trans/debuginfo/mod.rs
@@ -164,9 +164,9 @@ pub fn finalize(cx: &CrateContext) {
         llvm::LLVMRustDIBuilderFinalize(DIB(cx));
         llvm::LLVMRustDIBuilderDispose(DIB(cx));
         // Debuginfo generation in LLVM by default uses a higher
-        // version of dwarf than OS X currently understands. We can
+        // version of dwarf than macOS currently understands. We can
         // instruct LLVM to emit an older version of dwarf, however,
-        // for OS X to understand. For more info see #11352
+        // for macOS to understand. For more info see #11352
         // This can be overridden using --llvm-opts -dwarf-version,N.
         // Android has the same issue (#22398)
         if cx.sess().target.target.options.is_like_osx ||
diff --git a/src/librustdoc/plugins.rs b/src/librustdoc/plugins.rs
index b8be84825c9..a38ef2b2518 100644
--- a/src/librustdoc/plugins.rs
+++ b/src/librustdoc/plugins.rs
@@ -42,7 +42,7 @@ impl PluginManager {
     /// Load a plugin with the given name.
     ///
     /// Turns `name` into the proper dynamic library filename for the given
-    /// platform. On windows, it turns into name.dll, on OS X, name.dylib, and
+    /// platform. On windows, it turns into name.dll, on macOS, name.dylib, and
     /// elsewhere, libname.so.
     pub fn load_plugin(&mut self, name: String) {
         let x = self.prefix.join(libname(name));
diff --git a/src/libstd/os/macos/mod.rs b/src/libstd/os/macos/mod.rs
index 4e995358fd8..c9406f73100 100644
--- a/src/libstd/os/macos/mod.rs
+++ b/src/libstd/os/macos/mod.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! MacOS-specific definitions
+//! macOS-specific definitions
 
 #![stable(feature = "raw_ext", since = "1.1.0")]
 
diff --git a/src/libstd/os/macos/raw.rs b/src/libstd/os/macos/raw.rs
index 8f9b29462c4..8ffddf638b1 100644
--- a/src/libstd/os/macos/raw.rs
+++ b/src/libstd/os/macos/raw.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! MacOS-specific raw type definitions
+//! macOS-specific raw type definitions
 
 #![stable(feature = "raw_ext", since = "1.1.0")]
 #![rustc_deprecated(since = "1.8.0",
diff --git a/src/libstd/rand/mod.rs b/src/libstd/rand/mod.rs
index b853e83de5d..4f33d726398 100644
--- a/src/libstd/rand/mod.rs
+++ b/src/libstd/rand/mod.rs
@@ -52,7 +52,7 @@
 //!     If an application does not have `getrandom` and likely to be run soon after first booting,
 //!     or on a system with very few entropy sources, one should consider using `/dev/random` via
 //!     `ReaderRng`.
-//! -   On some systems (e.g. FreeBSD, OpenBSD and Mac OS X) there is no difference
+//! -   On some systems (e.g. FreeBSD, OpenBSD and macOS) there is no difference
 //!     between the two sources. (Also note that, on some systems e.g. FreeBSD, both `/dev/random`
 //!     and `/dev/urandom` may block once if the CSPRNG has not seeded yet.)
 
@@ -195,7 +195,7 @@ impl Rng for ThreadRng {
 /// A random number generator that retrieves randomness straight from
 /// the operating system. Platform sources:
 ///
-/// - Unix-like systems (Linux, Android, Mac OSX): read directly from
+/// - Unix-like systems (Linux, Android, macOS): read directly from
 ///   `/dev/urandom`, or from `getrandom(2)` system call if available.
 /// - Windows: calls `CryptGenRandom`, using the default cryptographic
 ///   service provider with the `PROV_RSA_FULL` type.
diff --git a/src/libstd/sys/redox/fast_thread_local.rs b/src/libstd/sys/redox/fast_thread_local.rs
index 6eeae2d90ea..f6414673dac 100644
--- a/src/libstd/sys/redox/fast_thread_local.rs
+++ b/src/libstd/sys/redox/fast_thread_local.rs
@@ -96,17 +96,17 @@ pub unsafe extern fn destroy_value<T>(ptr: *mut u8) {
     // `None`.
     (*ptr).dtor_running.set(true);
 
-    // The OSX implementation of TLS apparently had an odd aspect to it
+    // The macOS implementation of TLS apparently had an odd aspect to it
     // where the pointer we have may be overwritten while this destructor
     // is running. Specifically if a TLS destructor re-accesses TLS it may
     // trigger a re-initialization of all TLS variables, paving over at
     // least some destroyed ones with initial values.
     //
-    // This means that if we drop a TLS value in place on OSX that we could
+    // This means that if we drop a TLS value in place on macOS that we could
     // revert the value to its original state halfway through the
     // destructor, which would be bad!
     //
-    // Hence, we use `ptr::read` on OSX (to move to a "safe" location)
+    // Hence, we use `ptr::read` on macOS (to move to a "safe" location)
     // instead of drop_in_place.
     if cfg!(target_os = "macos") {
         ptr::read((*ptr).inner.get());
diff --git a/src/libstd/sys/redox/process.rs b/src/libstd/sys/redox/process.rs
index 60dc03fcf47..707b4cbc6ac 100644
--- a/src/libstd/sys/redox/process.rs
+++ b/src/libstd/sys/redox/process.rs
@@ -249,7 +249,7 @@ impl Command {
     // mutex, and then after the fork they unlock it.
     //
     // Despite this information, libnative's spawn has been witnessed to
-    // deadlock on both OSX and FreeBSD. I'm not entirely sure why, but
+    // deadlock on both macOS and FreeBSD. I'm not entirely sure why, but
     // all collected backtraces point at malloc/free traffic in the
     // child spawned process.
     //
diff --git a/src/libstd/sys/unix/backtrace/mod.rs b/src/libstd/sys/unix/backtrace/mod.rs
index 29d4012dcdf..bf52da2ed4a 100644
--- a/src/libstd/sys/unix/backtrace/mod.rs
+++ b/src/libstd/sys/unix/backtrace/mod.rs
@@ -13,7 +13,7 @@
 /// Some methods of getting a backtrace:
 ///
 /// * The backtrace() functions on unix. It turns out this doesn't work very
-///   well for green threads on OSX, and the address to symbol portion of it
+///   well for green threads on macOS, and the address to symbol portion of it
 ///   suffers problems that are described below.
 ///
 /// * Using libunwind. This is more difficult than it sounds because libunwind
@@ -51,9 +51,9 @@
 ///
 /// * Use dladdr(). The original backtrace()-based idea actually uses dladdr()
 ///   behind the scenes to translate, and this is why backtrace() was not used.
-///   Conveniently, this method works fantastically on OSX. It appears dladdr()
+///   Conveniently, this method works fantastically on macOS. It appears dladdr()
 ///   uses magic to consult the local symbol table, or we're putting everything
-///   in the dynamic symbol table anyway. Regardless, for OSX, this is the
+///   in the dynamic symbol table anyway. Regardless, for macOS, this is the
 ///   method used for translation. It's provided by the system and easy to do.o
 ///
 ///   Sadly, all other systems have a dladdr() implementation that does not
@@ -75,7 +75,7 @@
 /// * Use `libbacktrace`. It turns out that this is a small library bundled in
 ///   the gcc repository which provides backtrace and symbol translation
 ///   functionality. All we really need from it is the backtrace functionality,
-///   and we only really need this on everything that's not OSX, so this is the
+///   and we only really need this on everything that's not macOS, so this is the
 ///   chosen route for now.
 ///
 /// In summary, the current situation uses libgcc_s to get a trace of stack
diff --git a/src/libstd/sys/unix/ext/net.rs b/src/libstd/sys/unix/ext/net.rs
index 1ba4a104e51..8a15f7ec682 100644
--- a/src/libstd/sys/unix/ext/net.rs
+++ b/src/libstd/sys/unix/ext/net.rs
@@ -204,7 +204,7 @@ impl SocketAddr {
         let len = self.len as usize - sun_path_offset();
         let path = unsafe { mem::transmute::<&[libc::c_char], &[u8]>(&self.addr.sun_path) };
 
-        // OSX seems to return a len of 16 and a zeroed sun_path for unnamed addresses
+        // macOS seems to return a len of 16 and a zeroed sun_path for unnamed addresses
         if len == 0 || (cfg!(not(target_os = "linux")) && self.addr.sun_path[0] == 0) {
             AddressKind::Unnamed
         } else if self.addr.sun_path[0] == 0 {
diff --git a/src/libstd/sys/unix/fast_thread_local.rs b/src/libstd/sys/unix/fast_thread_local.rs
index f4f73646e1b..07d76a93dd1 100644
--- a/src/libstd/sys/unix/fast_thread_local.rs
+++ b/src/libstd/sys/unix/fast_thread_local.rs
@@ -128,7 +128,7 @@ unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern fn(*mut u8)) {
     register_dtor_fallback(t, dtor);
 }
 
-// OSX's analog of the above linux function is this _tlv_atexit function.
+// macOS's analog of the above linux function is this _tlv_atexit function.
 // The disassembly of thread_local globals in C++ (at least produced by
 // clang) will have this show up in the output.
 #[cfg(target_os = "macos")]
@@ -154,17 +154,17 @@ pub unsafe extern fn destroy_value<T>(ptr: *mut u8) {
     // `None`.
     (*ptr).dtor_running.set(true);
 
-    // The OSX implementation of TLS apparently had an odd aspect to it
+    // The macOS implementation of TLS apparently had an odd aspect to it
     // where the pointer we have may be overwritten while this destructor
     // is running. Specifically if a TLS destructor re-accesses TLS it may
     // trigger a re-initialization of all TLS variables, paving over at
     // least some destroyed ones with initial values.
     //
-    // This means that if we drop a TLS value in place on OSX that we could
+    // This means that if we drop a TLS value in place on macOS that we could
     // revert the value to its original state halfway through the
     // destructor, which would be bad!
     //
-    // Hence, we use `ptr::read` on OSX (to move to a "safe" location)
+    // Hence, we use `ptr::read` on macOS (to move to a "safe" location)
     // instead of drop_in_place.
     if cfg!(target_os = "macos") {
         ptr::read((*ptr).inner.get());
diff --git a/src/libstd/sys/unix/fd.rs b/src/libstd/sys/unix/fd.rs
index c690fd467ee..405fac2b9d7 100644
--- a/src/libstd/sys/unix/fd.rs
+++ b/src/libstd/sys/unix/fd.rs
@@ -29,7 +29,7 @@ fn max_len() -> usize {
     // with the man page quoting that if the count of bytes to read is
     // greater than `SSIZE_MAX` the result is "unspecified".
     //
-    // On OSX, however, apparently the 64-bit libc is either buggy or
+    // On macOS, however, apparently the 64-bit libc is either buggy or
     // intentionally showing odd behavior by rejecting any read with a size
     // larger than or equal to INT_MAX. To handle both of these the read
     // size is capped on both platforms.
diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
index d0fb96b1ff1..e893a139094 100644
--- a/src/libstd/sys/unix/fs.rs
+++ b/src/libstd/sys/unix/fs.rs
@@ -439,7 +439,7 @@ impl File {
         // Linux kernel then the flag is just ignored by the OS, so we continue
         // to explicitly ask for a CLOEXEC fd here.
         //
-        // The CLOEXEC flag, however, is supported on versions of OSX/BSD/etc
+        // The CLOEXEC flag, however, is supported on versions of macOS/BSD/etc
         // that we support, so we only do this on Linux currently.
         if cfg!(target_os = "linux") {
             fd.set_cloexec()?;
@@ -573,7 +573,7 @@ impl fmt::Debug for File {
         #[cfg(target_os = "macos")]
         fn get_path(fd: c_int) -> Option<PathBuf> {
             // FIXME: The use of PATH_MAX is generally not encouraged, but it
-            // is inevitable in this case because OS X defines `fcntl` with
+            // is inevitable in this case because macOS defines `fcntl` with
             // `F_GETPATH` in terms of `MAXPATHLEN`, and there are no
             // alternatives. If a better method is invented, it should be used
             // instead.
diff --git a/src/libstd/sys/unix/process/process_common.rs b/src/libstd/sys/unix/process/process_common.rs
index a4536520376..5f1a6c2f746 100644
--- a/src/libstd/sys/unix/process/process_common.rs
+++ b/src/libstd/sys/unix/process/process_common.rs
@@ -434,8 +434,8 @@ mod tests {
     }
 
     // See #14232 for more information, but it appears that signal delivery to a
-    // newly spawned process may just be raced in the OSX, so to prevent this
-    // test from being flaky we ignore it on OSX.
+    // newly spawned process may just be raced in the macOS, so to prevent this
+    // test from being flaky we ignore it on macOS.
     #[test]
     #[cfg_attr(target_os = "macos", ignore)]
     #[cfg_attr(target_os = "nacl", ignore)] // no signals on NaCl.
diff --git a/src/libstd/sys/unix/process/process_unix.rs b/src/libstd/sys/unix/process/process_unix.rs
index bbc987209e3..a213273aac8 100644
--- a/src/libstd/sys/unix/process/process_unix.rs
+++ b/src/libstd/sys/unix/process/process_unix.rs
@@ -129,7 +129,7 @@ impl Command {
     // mutex, and then after the fork they unlock it.
     //
     // Despite this information, libnative's spawn has been witnessed to
-    // deadlock on both OSX and FreeBSD. I'm not entirely sure why, but
+    // deadlock on both macOS and FreeBSD. I'm not entirely sure why, but
     // all collected backtraces point at malloc/free traffic in the
     // child spawned process.
     //
diff --git a/src/libstd/sys/unix/stack_overflow.rs b/src/libstd/sys/unix/stack_overflow.rs
index 22d47ba0f62..51adbc24ae0 100644
--- a/src/libstd/sys/unix/stack_overflow.rs
+++ b/src/libstd/sys/unix/stack_overflow.rs
@@ -187,7 +187,7 @@ mod imp {
             let stack =  libc::stack_t {
                 ss_sp: ptr::null_mut(),
                 ss_flags: SS_DISABLE,
-                // Workaround for bug in MacOS implementation of sigaltstack
+                // Workaround for bug in macOS implementation of sigaltstack
                 // UNIX2003 which returns ENOMEM when disabling a stack while
                 // passing ss_size smaller than MINSIGSTKSZ. According to POSIX
                 // both ss_sp and ss_size should be ignored in this case.
diff --git a/src/libstd/thread/local.rs b/src/libstd/thread/local.rs
index 66f09a7069c..e2b22b1d89f 100644
--- a/src/libstd/thread/local.rs
+++ b/src/libstd/thread/local.rs
@@ -74,7 +74,7 @@ use mem;
 ///    destroyed, but not all platforms have this guard. Those platforms that do
 ///    not guard typically have a synthetic limit after which point no more
 ///    destructors are run.
-/// 3. On OSX, initializing TLS during destruction of other TLS slots can
+/// 3. On macOS, initializing TLS during destruction of other TLS slots can
 ///    sometimes cancel *all* destructors for the current thread, whether or not
 ///    the slots have already had their destructors run or not.
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -524,9 +524,9 @@ mod tests {
     }
 
     // Note that this test will deadlock if TLS destructors aren't run (this
-    // requires the destructor to be run to pass the test). OSX has a known bug
+    // requires the destructor to be run to pass the test). macOS has a known bug
     // where dtors-in-dtors may cancel other destructors, so we just ignore this
-    // test on OSX.
+    // test on macOS.
     #[test]
     #[cfg_attr(target_os = "macos", ignore)]
     fn dtors_in_dtors_in_dtors() {
diff --git a/src/libterm/terminfo/searcher.rs b/src/libterm/terminfo/searcher.rs
index 011d06b1c0f..c9bde8b7b33 100644
--- a/src/libterm/terminfo/searcher.rs
+++ b/src/libterm/terminfo/searcher.rs
@@ -67,7 +67,7 @@ pub fn get_dbpath_for_term(term: &str) -> Option<PathBuf> {
             p.pop();
 
             // on some installations the dir is named after the hex of the char
-            // (e.g. OS X)
+            // (e.g. macOS)
             p.push(&format!("{:x}", first_char as usize));
             p.push(term);
             if fs::metadata(&p).is_ok() {
@@ -82,7 +82,7 @@ pub fn get_dbpath_for_term(term: &str) -> Option<PathBuf> {
 #[ignore(reason = "buildbots don't have ncurses installed and I can't mock everything I need")]
 fn test_get_dbpath_for_term() {
     // woefully inadequate test coverage
-    // note: current tests won't work with non-standard terminfo hierarchies (e.g. OS X's)
+    // note: current tests won't work with non-standard terminfo hierarchies (e.g. macOS's)
     use std::env;
     // FIXME (#9639): This needs to handle non-utf8 paths
     fn x(t: &str) -> String {
diff --git a/src/test/compile-fail/allocator-dylib-is-system.rs b/src/test/compile-fail/allocator-dylib-is-system.rs
index 4c576de2202..31009554c69 100644
--- a/src/test/compile-fail/allocator-dylib-is-system.rs
+++ b/src/test/compile-fail/allocator-dylib-is-system.rs
@@ -30,7 +30,7 @@ extern crate allocator_dylib;
 // that this just passes on those platforms we link in some other allocator to
 // ensure we get the same error.
 //
-// So long as we CI linux/OSX we should be good.
+// So long as we CI linux/macOS we should be good.
 #[cfg(any(target_os = "linux", target_os = "macos"))]
 extern crate alloc_jemalloc;
 #[cfg(not(any(target_os = "linux", target_os = "macos")))]
diff --git a/src/test/compile-fail/allocator-rust-dylib-is-jemalloc.rs b/src/test/compile-fail/allocator-rust-dylib-is-jemalloc.rs
index 5d566c0e0b4..68e01bad96b 100644
--- a/src/test/compile-fail/allocator-rust-dylib-is-jemalloc.rs
+++ b/src/test/compile-fail/allocator-rust-dylib-is-jemalloc.rs
@@ -28,7 +28,7 @@ extern crate allocator_dylib2;
 // that this just passes on those platforms we link in some other allocator to
 // ensure we get the same error.
 //
-// So long as we CI linux/OSX we should be good.
+// So long as we CI linux/macOS we should be good.
 #[cfg(any(all(target_os = "linux", any(target_arch = "x86", target_arch = "x86_64")),
           target_os = "macos"))]
 extern crate alloc_system;
diff --git a/src/test/compile-fail/manual-link-framework.rs b/src/test/compile-fail/manual-link-framework.rs
index 97176a533d2..1ecf63813e9 100644
--- a/src/test/compile-fail/manual-link-framework.rs
+++ b/src/test/compile-fail/manual-link-framework.rs
@@ -11,7 +11,7 @@
 // ignore-macos
 // ignore-ios
 // compile-flags:-l framework=foo
-// error-pattern: native frameworks are only available on OSX targets
+// error-pattern: native frameworks are only available on macOS targets
 
 fn main() {
 }
diff --git a/src/test/compile-fail/osx-frameworks.rs b/src/test/compile-fail/osx-frameworks.rs
index aba5fb3bc03..026ef3c95f6 100644
--- a/src/test/compile-fail/osx-frameworks.rs
+++ b/src/test/compile-fail/osx-frameworks.rs
@@ -12,7 +12,7 @@
 
 #[link(name = "foo", kind = "framework")]
 extern {}
-//~^^ ERROR: native frameworks are only available on OSX
+//~^^ ERROR: native frameworks are only available on macOS
 
 fn main() {
 }
diff --git a/src/test/run-pass/simd-intrinsic-generic-cast.rs b/src/test/run-pass/simd-intrinsic-generic-cast.rs
index d32fa01c7b9..ede2325b51c 100644
--- a/src/test/run-pass/simd-intrinsic-generic-cast.rs
+++ b/src/test/run-pass/simd-intrinsic-generic-cast.rs
@@ -94,7 +94,7 @@ fn main() {
             // (E.g. negative float to unsigned integer goes through a
             // library routine on the default i686 platforms, and the
             // implementation of that routine differs on e.g. Linux
-            // vs. OSX, resulting in different answers.)
+            // vs. macOS, resulting in different answers.)
             if $from::is_float() {
                 if !$to::in_range(A) { from.0 = 0 as $to; to.0 = 0 as $to; }
                 if !$to::in_range(B) { from.1 = 0 as $to; to.1 = 0 as $to; }
diff --git a/src/tools/compiletest/src/raise_fd_limit.rs b/src/tools/compiletest/src/raise_fd_limit.rs
index e2629ffd8f5..fcc5a727cf2 100644
--- a/src/tools/compiletest/src/raise_fd_limit.rs
+++ b/src/tools/compiletest/src/raise_fd_limit.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-/// darwin_fd_limit exists to work around an issue where launchctl on Mac OS X
+/// darwin_fd_limit exists to work around an issue where launchctl on macOS
 /// defaults the rlimit maxfiles to 256/unlimited. The default soft limit of 256
 /// ends up being far too low for our multithreaded scheduler testing, depending
 /// on the number of cores available.