Auto merge of #63744 - Centril:rollup-g4l3ra9, r=Centril

Rollup of 7 pull requests

Successful merges:

 - #63216 (avoid unnecessary reservations in std::io::Take::read_to_end)
 - #63265 (Implement `nth_back` for ChunksExactMut)
 - #63691 (Fix bug in iter::Chain::size_hint)
 - #63722 (Don't use stage naming in RUSTFLAGS environment variables)
 - #63723 (Consolidate sigemptyset workarounds)
 - #63736 (Restore the rustc_plugin crate in the sysroot)
 - #63743 (Allow git to merge `Cargo.lock`)

Failed merges:

r? @ghost

1 files changed, 3 insertions, 10 deletions

diff --git a/src/libstd/sys/unix/process/process_unix.rs b/src/libstd/sys/unix/process/process_unix.rs
index 327d82e60cf..a9711c71b7a 100644
--- a/src/libstd/sys/unix/process/process_unix.rs
+++ b/src/libstd/sys/unix/process/process_unix.rs
@@ -214,14 +214,7 @@ impl Command {
             // need to clean things up now to avoid confusing the program
             // we're about to run.
             let mut set = MaybeUninit::<libc::sigset_t>::uninit();
-            if cfg!(target_os = "android") {
-                // Implementing sigemptyset allow us to support older Android
-                // versions. See the comment about Android and sig* functions in
-                // process_common.rs
-                set.as_mut_ptr().write_bytes(0u8, 1);
-            } else {
-                cvt(libc::sigemptyset(set.as_mut_ptr()))?;
-            }
+            cvt(sigemptyset(set.as_mut_ptr()))?;
             cvt(libc::pthread_sigmask(libc::SIG_SETMASK, set.as_ptr(),
                                          ptr::null_mut()))?;
             let ret = sys::signal(libc::SIGPIPE, libc::SIG_DFL);
@@ -363,10 +356,10 @@ impl Command {
             }
 
             let mut set = MaybeUninit::<libc::sigset_t>::uninit();
-            cvt(libc::sigemptyset(set.as_mut_ptr()))?;
+            cvt(sigemptyset(set.as_mut_ptr()))?;
             cvt(libc::posix_spawnattr_setsigmask(attrs.0.as_mut_ptr(),
                                                  set.as_ptr()))?;
-            cvt(libc::sigaddset(set.as_mut_ptr(), libc::SIGPIPE))?;
+            cvt(sigaddset(set.as_mut_ptr(), libc::SIGPIPE))?;
             cvt(libc::posix_spawnattr_setsigdefault(attrs.0.as_mut_ptr(),
                                                     set.as_ptr()))?;