Remove weak.rs for VxWorks

src/libstd/sys/vxworks/weak.rs

@@ -1,56 +0,0 @@
-//! Support for "weak linkage" to symbols on Unix
-//!
-//! Some I/O operations we do in libstd require newer versions of OSes but we
-//! need to maintain binary compatibility with older releases for now. In order
-//! to use the new functionality when available we use this module for
-//! detection.
-//!
-//! One option to use here is weak linkage, but that is unfortunately only
-//! really workable on Linux. Hence, use dlsym to get the symbol value at
-//! runtime. This is also done for compatibility with older versions of glibc,
-//! and to avoid creating dependencies on GLIBC_PRIVATE symbols. It assumes that
-//! we've been dynamically linked to the library the symbol comes from, but that
-//! is currently always the case for things like libpthread/libc.
-//!
-//! A long time ago this used weak linkage for the __pthread_get_minstack
-//! symbol, but that caused Debian to detect an unnecessarily strict versioned
-//! dependency on libc6 (#23628).
-
-use crate::ffi::CStr;
-use crate::marker;
-use crate::mem;
-use crate::sync::atomic::{AtomicUsize, Ordering};
-
-pub struct Weak<F> {
-    name: &'static str,
-    addr: AtomicUsize,
-    _marker: marker::PhantomData<F>,
-}
-
-impl<F> Weak<F> {
-    pub const fn new(name: &'static str) -> Weak<F> {
-        Weak { name, addr: AtomicUsize::new(1), _marker: marker::PhantomData }
-    }
-
-    pub fn get(&self) -> Option<F> {
-        assert_eq!(mem::size_of::<F>(), mem::size_of::<usize>());
-        unsafe {
-            if self.addr.load(Ordering::SeqCst) == 1 {
-                self.addr.store(fetch(self.name), Ordering::SeqCst);
-            }
-            match self.addr.load(Ordering::SeqCst) {
-                0 => None,
-                addr => Some(mem::transmute_copy::<usize, F>(&addr)),
-            }
-        }
-    }
-}
-
-unsafe fn fetch(name: &str) -> usize {
-    let name = match CStr::from_bytes_with_nul(name.as_bytes()) {
-        Ok(cstr) => cstr,
-        Err(..) => return 0,
-    };
-    assert!(false, "FIXME: fetch");
-    libc::dlsym(libc::RTLD_DEFAULT, name.as_ptr()) as usize
-}