diff --git a/src/cloudabi/aarch64.rs b/src/cloudabi/aarch64.rs
deleted file mode 100644
index 4caa6d7bbcf47..0000000000000
--- a/src/cloudabi/aarch64.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub type c_char = u8;
-pub type c_long = i64;
-pub type c_ulong = u64;
-pub type wchar_t = u32;
diff --git a/src/cloudabi/arm.rs b/src/cloudabi/arm.rs
deleted file mode 100644
index eca5360744127..0000000000000
--- a/src/cloudabi/arm.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub type c_char = u8;
-pub type c_long = i32;
-pub type c_ulong = u32;
-pub type wchar_t = u32;
diff --git a/src/cloudabi/mod.rs b/src/cloudabi/mod.rs
deleted file mode 100644
index 77817121d677f..0000000000000
--- a/src/cloudabi/mod.rs
+++ /dev/null
@@ -1,375 +0,0 @@
-pub type c_schar = i8;
-pub type c_uchar = u8;
-pub type c_short = i16;
-pub type c_ushort = u16;
-pub type c_int = i32;
-pub type c_uint = u32;
-pub type c_float = f32;
-pub type c_double = f64;
-pub type c_longlong = i64;
-pub type c_ulonglong = u64;
-pub type intmax_t = i64;
-pub type uintmax_t = u64;
-
-pub type size_t = usize;
-pub type ptrdiff_t = isize;
-pub type intptr_t = isize;
-pub type uintptr_t = usize;
-pub type ssize_t = isize;
-
-pub type in_addr_t = u32;
-pub type in_port_t = u16;
-pub type pthread_key_t = usize;
-pub type pthread_t = usize;
-pub type sa_family_t = u8;
-pub type socklen_t = usize;
-pub type time_t = i64;
-
-s! {
-    pub struct addrinfo {
-        pub ai_flags: ::c_int,
-        pub ai_family: ::c_int,
-        pub ai_socktype: ::c_int,
-        pub ai_protocol: ::c_int,
-        pub ai_addrlen: ::socklen_t,
-        pub ai_addr: *mut ::sockaddr,
-        pub ai_canonname: *mut ::c_char,
-        pub ai_next: *mut addrinfo,
-    }
-
-    pub struct in_addr {
-        pub s_addr: in_addr_t,
-    }
-
-    pub struct in6_addr {
-        pub s6_addr: [u8; 16],
-    }
-
-    pub struct pthread_attr_t {
-        __detachstate: ::c_int,
-        __stacksize: usize,
-    }
-
-    pub struct sockaddr {
-        pub sa_family: sa_family_t,
-        pub sa_data: [::c_char; 0],
-    }
-
-    pub struct sockaddr_in {
-        pub sin_family: ::sa_family_t,
-        pub sin_port: ::in_port_t,
-        pub sin_addr: ::in_addr,
-    }
-
-    pub struct sockaddr_in6 {
-        pub sin6_family: sa_family_t,
-        pub sin6_port: ::in_port_t,
-        pub sin6_flowinfo: u32,
-        pub sin6_addr: ::in6_addr,
-        pub sin6_scope_id: u32,
-    }
-
-    pub struct sockaddr_storage {
-        pub ss_family: ::sa_family_t,
-        __ss_data: [u8; 32],
-    }
-}
-
-pub const INT_MIN: c_int = -2147483648;
-pub const INT_MAX: c_int = 2147483647;
-
-pub const _SC_NPROCESSORS_ONLN: ::c_int = 52;
-pub const _SC_PAGESIZE: ::c_int = 54;
-
-pub const AF_INET: ::c_int = 1;
-pub const AF_INET6: ::c_int = 2;
-
-pub const EACCES: ::c_int = 2;
-pub const EADDRINUSE: ::c_int = 3;
-pub const EADDRNOTAVAIL: ::c_int = 4;
-pub const EAGAIN: ::c_int = 6;
-pub const ECONNABORTED: ::c_int = 13;
-pub const ECONNREFUSED: ::c_int = 14;
-pub const ECONNRESET: ::c_int = 15;
-pub const EEXIST: ::c_int = 20;
-pub const EINTR: ::c_int = 27;
-pub const EINVAL: ::c_int = 28;
-pub const ENOENT: ::c_int = 44;
-pub const ENOTCONN: ::c_int = 53;
-pub const EPERM: ::c_int = 63;
-pub const EPIPE: ::c_int = 64;
-pub const ETIMEDOUT: ::c_int = 73;
-pub const EWOULDBLOCK: ::c_int = EAGAIN;
-
-pub const EAI_SYSTEM: ::c_int = 9;
-
-pub const EXIT_FAILURE: ::c_int = 1;
-pub const EXIT_SUCCESS: ::c_int = 0;
-
-pub const PTHREAD_STACK_MIN: ::size_t = 1024;
-
-pub const SOCK_DGRAM: ::c_int = 128;
-pub const SOCK_STREAM: ::c_int = 130;
-
-#[cfg_attr(feature = "extra_traits", derive(Debug))]
-pub enum FILE {}
-impl ::Copy for FILE {}
-impl ::Clone for FILE {
-    fn clone(&self) -> FILE {
-        *self
-    }
-}
-#[cfg_attr(feature = "extra_traits", derive(Debug))]
-pub enum fpos_t {} // FIXME: fill this out with a struct
-impl ::Copy for fpos_t {}
-impl ::Clone for fpos_t {
-    fn clone(&self) -> fpos_t {
-        *self
-    }
-}
-
-extern "C" {
-    pub fn isalnum(c: c_int) -> c_int;
-    pub fn isalpha(c: c_int) -> c_int;
-    pub fn iscntrl(c: c_int) -> c_int;
-    pub fn isdigit(c: c_int) -> c_int;
-    pub fn isgraph(c: c_int) -> c_int;
-    pub fn islower(c: c_int) -> c_int;
-    pub fn isprint(c: c_int) -> c_int;
-    pub fn ispunct(c: c_int) -> c_int;
-    pub fn isspace(c: c_int) -> c_int;
-    pub fn isupper(c: c_int) -> c_int;
-    pub fn isxdigit(c: c_int) -> c_int;
-    pub fn isblank(c: c_int) -> c_int;
-    pub fn tolower(c: c_int) -> c_int;
-    pub fn toupper(c: c_int) -> c_int;
-    pub fn fopen(filename: *const c_char, mode: *const c_char) -> *mut FILE;
-    pub fn freopen(
-        filename: *const c_char,
-        mode: *const c_char,
-        file: *mut FILE,
-    ) -> *mut FILE;
-    pub fn fflush(file: *mut FILE) -> c_int;
-    pub fn fclose(file: *mut FILE) -> c_int;
-    pub fn remove(filename: *const c_char) -> c_int;
-    pub fn rename(oldname: *const c_char, newname: *const c_char) -> c_int;
-    pub fn tmpfile() -> *mut FILE;
-    pub fn setvbuf(
-        stream: *mut FILE,
-        buffer: *mut c_char,
-        mode: c_int,
-        size: size_t,
-    ) -> c_int;
-    pub fn setbuf(stream: *mut FILE, buf: *mut c_char);
-    pub fn getchar() -> c_int;
-    pub fn putchar(c: c_int) -> c_int;
-    pub fn fgetc(stream: *mut FILE) -> c_int;
-    pub fn fgets(buf: *mut c_char, n: c_int, stream: *mut FILE)
-        -> *mut c_char;
-    pub fn fputc(c: c_int, stream: *mut FILE) -> c_int;
-    pub fn fputs(s: *const c_char, stream: *mut FILE) -> c_int;
-    pub fn puts(s: *const c_char) -> c_int;
-    pub fn ungetc(c: c_int, stream: *mut FILE) -> c_int;
-    pub fn fread(
-        ptr: *mut c_void,
-        size: size_t,
-        nobj: size_t,
-        stream: *mut FILE,
-    ) -> size_t;
-    pub fn fwrite(
-        ptr: *const c_void,
-        size: size_t,
-        nobj: size_t,
-        stream: *mut FILE,
-    ) -> size_t;
-    pub fn fseek(stream: *mut FILE, offset: c_long, whence: c_int) -> c_int;
-    pub fn ftell(stream: *mut FILE) -> c_long;
-    pub fn rewind(stream: *mut FILE);
-    pub fn fgetpos(stream: *mut FILE, ptr: *mut fpos_t) -> c_int;
-    pub fn fsetpos(stream: *mut FILE, ptr: *const fpos_t) -> c_int;
-    pub fn feof(stream: *mut FILE) -> c_int;
-    pub fn ferror(stream: *mut FILE) -> c_int;
-    pub fn perror(s: *const c_char);
-    pub fn atoi(s: *const c_char) -> c_int;
-    pub fn strtod(s: *const c_char, endp: *mut *mut c_char) -> c_double;
-    pub fn strtol(
-        s: *const c_char,
-        endp: *mut *mut c_char,
-        base: c_int,
-    ) -> c_long;
-    pub fn strtoul(
-        s: *const c_char,
-        endp: *mut *mut c_char,
-        base: c_int,
-    ) -> c_ulong;
-    pub fn calloc(nobj: size_t, size: size_t) -> *mut c_void;
-    pub fn malloc(size: size_t) -> *mut c_void;
-    pub fn realloc(p: *mut c_void, size: size_t) -> *mut c_void;
-    pub fn free(p: *mut c_void);
-    pub fn abort() -> !;
-    pub fn exit(status: c_int) -> !;
-    pub fn _exit(status: c_int) -> !;
-    pub fn atexit(cb: extern "C" fn()) -> c_int;
-    pub fn system(s: *const c_char) -> c_int;
-    pub fn getenv(s: *const c_char) -> *mut c_char;
-    pub fn getline(
-        lineptr: *mut *mut c_char,
-        n: *mut size_t,
-        stream: *mut FILE,
-    ) -> ssize_t;
-
-    pub fn strcpy(dst: *mut c_char, src: *const c_char) -> *mut c_char;
-    pub fn strncpy(
-        dst: *mut c_char,
-        src: *const c_char,
-        n: size_t,
-    ) -> *mut c_char;
-    pub fn strcat(s: *mut c_char, ct: *const c_char) -> *mut c_char;
-    pub fn strncat(
-        s: *mut c_char,
-        ct: *const c_char,
-        n: size_t,
-    ) -> *mut c_char;
-    pub fn strcmp(cs: *const c_char, ct: *const c_char) -> c_int;
-    pub fn strncmp(cs: *const c_char, ct: *const c_char, n: size_t) -> c_int;
-    pub fn strcoll(cs: *const c_char, ct: *const c_char) -> c_int;
-    pub fn strchr(cs: *const c_char, c: c_int) -> *mut c_char;
-    pub fn strrchr(cs: *const c_char, c: c_int) -> *mut c_char;
-    pub fn strspn(cs: *const c_char, ct: *const c_char) -> size_t;
-    pub fn strcspn(cs: *const c_char, ct: *const c_char) -> size_t;
-    pub fn strdup(cs: *const c_char) -> *mut c_char;
-    pub fn strpbrk(cs: *const c_char, ct: *const c_char) -> *mut c_char;
-    pub fn strstr(cs: *const c_char, ct: *const c_char) -> *mut c_char;
-    pub fn strcasecmp(s1: *const c_char, s2: *const c_char) -> c_int;
-    pub fn strncasecmp(
-        s1: *const c_char,
-        s2: *const c_char,
-        n: size_t,
-    ) -> c_int;
-    pub fn strlen(cs: *const c_char) -> size_t;
-    pub fn strnlen(cs: *const c_char, maxlen: size_t) -> size_t;
-    pub fn strerror(n: c_int) -> *mut c_char;
-    pub fn strtok(s: *mut c_char, t: *const c_char) -> *mut c_char;
-    pub fn strxfrm(s: *mut c_char, ct: *const c_char, n: size_t) -> size_t;
-    pub fn wcslen(buf: *const wchar_t) -> size_t;
-    pub fn wcstombs(
-        dest: *mut c_char,
-        src: *const wchar_t,
-        n: size_t,
-    ) -> ::size_t;
-
-    pub fn memchr(cx: *const c_void, c: c_int, n: size_t) -> *mut c_void;
-    pub fn wmemchr(cx: *const wchar_t, c: wchar_t, n: size_t) -> *mut wchar_t;
-    pub fn memcmp(cx: *const c_void, ct: *const c_void, n: size_t) -> c_int;
-    pub fn memcpy(
-        dest: *mut c_void,
-        src: *const c_void,
-        n: size_t,
-    ) -> *mut c_void;
-    pub fn memmove(
-        dest: *mut c_void,
-        src: *const c_void,
-        n: size_t,
-    ) -> *mut c_void;
-    pub fn memset(dest: *mut c_void, c: c_int, n: size_t) -> *mut c_void;
-
-    pub fn abs(i: c_int) -> c_int;
-    pub fn atof(s: *const c_char) -> c_double;
-    pub fn labs(i: c_long) -> c_long;
-    pub fn rand() -> c_int;
-    pub fn srand(seed: c_uint);
-
-    pub fn arc4random_buf(buf: *const ::c_void, len: ::size_t);
-    pub fn freeaddrinfo(res: *mut addrinfo);
-    pub fn gai_strerror(errcode: ::c_int) -> *const ::c_char;
-    pub fn getaddrinfo(
-        node: *const c_char,
-        service: *const c_char,
-        hints: *const addrinfo,
-        res: *mut *mut addrinfo,
-    ) -> ::c_int;
-    pub fn getsockopt(
-        sockfd: ::c_int,
-        level: ::c_int,
-        optname: ::c_int,
-        optval: *mut ::c_void,
-        optlen: *mut ::socklen_t,
-    ) -> ::c_int;
-    pub fn posix_memalign(
-        memptr: *mut *mut ::c_void,
-        align: ::size_t,
-        size: ::size_t,
-    ) -> ::c_int;
-    pub fn pthread_attr_destroy(attr: *mut ::pthread_attr_t) -> ::c_int;
-    pub fn pthread_attr_init(attr: *mut ::pthread_attr_t) -> ::c_int;
-    pub fn pthread_attr_setstacksize(
-        attr: *mut ::pthread_attr_t,
-        stack_size: ::size_t,
-    ) -> ::c_int;
-    pub fn pthread_create(
-        native: *mut ::pthread_t,
-        attr: *const ::pthread_attr_t,
-        f: extern "C" fn(*mut ::c_void) -> *mut ::c_void,
-        value: *mut ::c_void,
-    ) -> ::c_int;
-    pub fn pthread_detach(thread: ::pthread_t) -> ::c_int;
-    pub fn pthread_getspecific(key: pthread_key_t) -> *mut ::c_void;
-    pub fn pthread_join(
-        native: ::pthread_t,
-        value: *mut *mut ::c_void,
-    ) -> ::c_int;
-    pub fn pthread_key_create(
-        key: *mut pthread_key_t,
-        dtor: ::Option<unsafe extern "C" fn(*mut ::c_void)>,
-    ) -> ::c_int;
-    pub fn pthread_key_delete(key: pthread_key_t) -> ::c_int;
-    pub fn pthread_setspecific(
-        key: pthread_key_t,
-        value: *const ::c_void,
-    ) -> ::c_int;
-    pub fn send(
-        socket: ::c_int,
-        buf: *const ::c_void,
-        len: ::size_t,
-        flags: ::c_int,
-    ) -> ::ssize_t;
-    pub fn sysconf(name: ::c_int) -> ::c_long;
-}
-
-cfg_if! {
-    if #[cfg(target_arch = "aarch64")] {
-        mod aarch64;
-        pub use self::aarch64::*;
-    } else if #[cfg(any(target_arch = "arm"))] {
-        mod arm;
-        pub use self::arm::*;
-    } else if #[cfg(any(target_arch = "x86"))] {
-        mod x86;
-        pub use self::x86::*;
-    } else if #[cfg(any(target_arch = "x86_64"))] {
-        mod x86_64;
-        pub use self::x86_64::*;
-    } else {
-        // Unknown target_arch
-    }
-}
-
-cfg_if! {
-    if #[cfg(libc_core_cvoid)] {
-        pub use ::ffi::c_void;
-    } else {
-        // Use repr(u8) as LLVM expects `void*` to be the same as `i8*` to help
-        // enable more optimization opportunities around it recognizing things
-        // like malloc/free.
-        #[repr(u8)]
-        #[allow(missing_copy_implementations)]
-        #[allow(missing_debug_implementations)]
-        pub enum c_void {
-            // Two dummy variants so the #[repr] attribute can be used.
-            #[doc(hidden)]
-            __variant1,
-            #[doc(hidden)]
-            __variant2,
-        }
-    }
-}
diff --git a/src/cloudabi/x86.rs b/src/cloudabi/x86.rs
deleted file mode 100644
index 2f9f39c9b9ec3..0000000000000
--- a/src/cloudabi/x86.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub type c_char = i8;
-pub type c_long = i32;
-pub type c_ulong = u32;
-pub type wchar_t = i32;
diff --git a/src/cloudabi/x86_64.rs b/src/cloudabi/x86_64.rs
deleted file mode 100644
index bb17624b1dd78..0000000000000
--- a/src/cloudabi/x86_64.rs
+++ /dev/null
@@ -1,4 +0,0 @@
-pub type c_char = i8;
-pub type c_long = i64;
-pub type c_ulong = u64;
-pub type wchar_t = i32;
diff --git a/src/lib.rs b/src/lib.rs
index 6bb71c552d624..30c94b0969bb4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -99,12 +99,6 @@ cfg_if! {
 
         mod windows;
         pub use windows::*;
-    } else if #[cfg(target_os = "cloudabi")] {
-        mod fixed_width_ints;
-        pub use fixed_width_ints::*;
-
-        mod cloudabi;
-        pub use cloudabi::*;
     } else if #[cfg(target_os = "fuchsia")] {
         mod fixed_width_ints;
         pub use fixed_width_ints::*;