rollup merge of #24376: lambdaburrito/master

Values for `_SC_*` are not the same value between `macos` and `linux` so I've added specific target constants for Mac OS X and added `_SC_NPROCESSORS_ONLN` for `linux` and `macos`.

Closes #24374

Author: alexcrichton

src/liblibc/lib.rs

@@ -3344,6 +3344,8 @@ pub mod consts {
             pub const _SC_XOPEN_REALTIME : c_int = 130;
             pub const _SC_XOPEN_REALTIME_THREADS : c_int = 131;
 
+
+
             pub const PTHREAD_CREATE_JOINABLE: c_int = 0;
             pub const PTHREAD_CREATE_DETACHED: c_int = 1;
 
@@ -3727,12 +3729,14 @@ pub mod consts {
             pub const _SC_2_FORT_RUN : c_int = 50;
             pub const _SC_2_SW_DEV : c_int = 51;
             pub const _SC_2_LOCALEDEF : c_int = 52;
+            pub const _SC_NPROCESSORS_ONLN : c_int = 84;
             pub const _SC_2_CHAR_TERM : c_int = 95;
             pub const _SC_2_C_VERSION : c_int = 96;
             pub const _SC_2_UPE : c_int = 97;
             pub const _SC_XBS5_ILP32_OFF32 : c_int = 125;
             pub const _SC_XBS5_ILP32_OFFBIG : c_int = 126;
             pub const _SC_XBS5_LPBIG_OFFBIG : c_int = 128;
+
         }
         #[cfg(target_os = "nacl")]
         pub mod sysconf {
@@ -3742,6 +3746,13 @@ pub mod consts {
             pub static _SC_NPROCESSORS_ONLN : c_int = 1;
             pub static _SC_PAGESIZE : c_int = 2;
         }
+
+        #[cfg(target_os = "macos")]
+        pub mod sysconf {
+            use types::os::arch::c95::c_int;
+            pub static _SC_NPROCESSORS_ONLN : c_int = 58;
+        }
+
         #[cfg(target_os = "android")]
         pub mod sysconf {
             use types::os::arch::c95::c_int;