Remove broken newlib support

Nix has never supported a newlib target, but there were a few cfg checks
for it in our codebase.  Some of them were misspelled (newlibc vs
newlib), and some of the checks were wrong.  Removing them makes the
code much more readable.

Author: asomers

src/time.rs

@@ -51,10 +51,8 @@ impl ClockId {
     #[cfg(not(any(
         target_os = "macos",
         target_os = "ios",
-        all(
-            not(any(target_env = "uclibc", target_env = "newlibc")),
-            any(target_os = "redox", target_os = "hermit",),
-        ),
+        target_os = "redox",
+        target_os = "hermit",
     )))]
     pub fn set_time(self, timespec: TimeSpec) -> Result<()> {
         clock_settime(self, timespec)
@@ -66,72 +64,65 @@ impl ClockId {
     }
 
     #[cfg(any(
+        target_os = "android",
+        target_os = "emscripten",
         target_os = "fuchsia",
-        all(
-            not(any(target_env = "uclibc", target_env = "newlib")),
-            any(target_os = "linux", target_os = "android", target_os = "emscripten"),
-        )
+        target_os = "linux"
     ))]
     pub const CLOCK_BOOTTIME: ClockId = ClockId(libc::CLOCK_BOOTTIME);
     #[cfg(any(
+        target_os = "android",
+        target_os = "emscripten",
         target_os = "fuchsia",
-        all(
-            not(any(target_env = "uclibc", target_env = "newlib")),
-            any(target_os = "linux", target_os = "android", target_os = "emscripten")
-        )
+        target_os = "linux"
     ))]
     pub const CLOCK_BOOTTIME_ALARM: ClockId = ClockId(libc::CLOCK_BOOTTIME_ALARM);
     pub const CLOCK_MONOTONIC: ClockId = ClockId(libc::CLOCK_MONOTONIC);
     #[cfg(any(
+        target_os = "android",
+        target_os = "emscripten",
         target_os = "fuchsia",
-        all(
-            not(any(target_env = "uclibc", target_env = "newlib")),
-            any(target_os = "linux", target_os = "android", target_os = "emscripten")
-        )
+        target_os = "linux"
     ))]
     pub const CLOCK_MONOTONIC_COARSE: ClockId = ClockId(libc::CLOCK_MONOTONIC_COARSE);
     #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
     pub const CLOCK_MONOTONIC_FAST: ClockId = ClockId(libc::CLOCK_MONOTONIC_FAST);
     #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
     pub const CLOCK_MONOTONIC_PRECISE: ClockId = ClockId(libc::CLOCK_MONOTONIC_PRECISE);
     #[cfg(any(
+        target_os = "android",
+        target_os = "emscripten",
         target_os = "fuchsia",
-        all(
-            not(any(target_env = "uclibc", target_env = "newlib")),
-            any(target_os = "linux", target_os = "android", target_os = "emscripten")
-        )
+        target_os = "linux"
     ))]
     pub const CLOCK_MONOTONIC_RAW: ClockId = ClockId(libc::CLOCK_MONOTONIC_RAW);
     #[cfg(any(
+        target_os = "android",
+        target_os = "emscripten",
         target_os = "fuchsia",
-        target_env = "uclibc",
         target_os = "macos",
         target_os = "ios",
         target_os = "freebsd",
         target_os = "dragonfly",
-        all(
-            not(target_env = "newlib"),
-            any(target_os = "linux", target_os = "android", target_os = "emscripten")
-        )
+        target_os = "redox",
+        target_os = "linux"
     ))]
     pub const CLOCK_PROCESS_CPUTIME_ID: ClockId = ClockId(libc::CLOCK_PROCESS_CPUTIME_ID);
     #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
     pub const CLOCK_PROF: ClockId = ClockId(libc::CLOCK_PROF);
     pub const CLOCK_REALTIME: ClockId = ClockId(libc::CLOCK_REALTIME);
     #[cfg(any(
+        target_os = "android",
+        target_os = "emscripten",
         target_os = "fuchsia",
-        all(
-            not(any(target_env = "uclibc", target_env = "newlib")),
-            any(target_os = "linux", target_os = "android", target_os = "emscripten")
-        )
+        target_os = "linux"
     ))]
     pub const CLOCK_REALTIME_ALARM: ClockId = ClockId(libc::CLOCK_REALTIME_ALARM);
     #[cfg(any(
+        target_os = "android",
+        target_os = "emscripten",
         target_os = "fuchsia",
-        all(
-            not(any(target_env = "uclibc", target_env = "newlib")),
-            any(target_os = "linux", target_os = "android", target_os = "emscripten")
-        )
+        target_os = "linux"
     ))]
     pub const CLOCK_REALTIME_COARSE: ClockId = ClockId(libc::CLOCK_REALTIME_COARSE);
     #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
@@ -141,38 +132,27 @@ impl ClockId {
     #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
     pub const CLOCK_SECOND: ClockId = ClockId(libc::CLOCK_SECOND);
     #[cfg(any(
+        target_os = "emscripten",
         target_os = "fuchsia",
-        all(
-            not(any(target_env = "uclibc", target_env = "newlib")),
-            any(
-                target_os = "emscripten",
-                all(target_os = "linux", target_env = "musl")
-            )
-        )
+        all(target_os = "linux", target_env = "musl")
     ))]
     pub const CLOCK_SGI_CYCLE: ClockId = ClockId(libc::CLOCK_SGI_CYCLE);
     #[cfg(any(
+        target_os = "android",
+        target_os = "emscripten",
         target_os = "fuchsia",
-        all(
-            not(any(target_env = "uclibc", target_env = "newlib")),
-            any(
-                target_os = "emscripten",
-                all(target_os = "linux", target_env = "musl")
-            )
-        )
+        target_os = "linux"
     ))]
     pub const CLOCK_TAI: ClockId = ClockId(libc::CLOCK_TAI);
     #[cfg(any(
-        target_env = "uclibc",
+        target_os = "android",
+        target_os = "emscripten",
         target_os = "fuchsia",
         target_os = "ios",
         target_os = "macos",
         target_os = "freebsd",
         target_os = "dragonfly",
-        all(
-            not(target_env = "newlib"),
-            any(target_os = "linux", target_os = "android", target_os = "emscripten",),
-        ),
+        target_os = "linux"
     ))]
     pub const CLOCK_THREAD_CPUTIME_ID: ClockId = ClockId(libc::CLOCK_THREAD_CPUTIME_ID);
     #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
@@ -229,10 +209,9 @@ pub fn clock_gettime(clock_id: ClockId) -> Result<TimeSpec> {
 #[cfg(not(any(
     target_os = "macos",
     target_os = "ios",
-    all(
-        not(any(target_env = "uclibc", target_env = "newlibc")),
-        any(target_os = "redox", target_os = "hermit",),
-    ),
+    target_env = "uclibc",
+    target_os = "redox",
+    target_os = "hermit",
 )))]
 pub fn clock_settime(clock_id: ClockId, timespec: TimeSpec) -> Result<()> {
     let ret = unsafe { libc::clock_settime(clock_id.as_raw(), timespec.as_ref()) };