diff --git a/Cargo.lock b/Cargo.lock
index 4f60ea30519..1470e2be75d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3348,17 +3348,6 @@ dependencies = [
  "smallvec 1.0.0",
 ]
 
-[[package]]
-name = "rustc_asan"
-version = "0.0.0"
-dependencies = [
- "alloc",
- "build_helper",
- "cmake",
- "compiler_builtins",
- "core",
-]
-
 [[package]]
 name = "rustc_ast_lowering"
 version = "0.0.0"
@@ -3680,17 +3669,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "rustc_lsan"
-version = "0.0.0"
-dependencies = [
- "alloc",
- "build_helper",
- "cmake",
- "compiler_builtins",
- "core",
-]
-
 [[package]]
 name = "rustc_macros"
 version = "0.1.0"
@@ -3752,17 +3730,6 @@ dependencies = [
  "syntax",
 ]
 
-[[package]]
-name = "rustc_msan"
-version = "0.0.0"
-dependencies = [
- "alloc",
- "build_helper",
- "cmake",
- "compiler_builtins",
- "core",
-]
-
 [[package]]
 name = "rustc_parse"
 version = "0.0.0"
@@ -3935,17 +3902,6 @@ dependencies = [
  "syntax",
 ]
 
-[[package]]
-name = "rustc_tsan"
-version = "0.0.0"
-dependencies = [
- "alloc",
- "build_helper",
- "cmake",
- "compiler_builtins",
- "core",
-]
-
 [[package]]
 name = "rustc_typeck"
 version = "0.0.0"
@@ -4307,10 +4263,6 @@ dependencies = [
  "panic_unwind",
  "profiler_builtins",
  "rand 0.7.0",
- "rustc_asan",
- "rustc_lsan",
- "rustc_msan",
- "rustc_tsan",
  "unwind",
  "wasi 0.9.0+wasi-snapshot-preview1",
 ]
diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
index e64d4c8637d..8d13df3ee21 100644
--- a/src/bootstrap/dist.rs
+++ b/src/bootstrap/dist.rs
@@ -984,10 +984,6 @@ impl Step for Src {
             "src/libcore",
             "src/libpanic_abort",
             "src/libpanic_unwind",
-            "src/librustc_asan",
-            "src/librustc_lsan",
-            "src/librustc_msan",
-            "src/librustc_tsan",
             "src/libstd",
             "src/libunwind",
             "src/libtest",
diff --git a/src/build_helper/lib.rs b/src/build_helper/lib.rs
index 3f42533238a..43c3c5773ce 100644
--- a/src/build_helper/lib.rs
+++ b/src/build_helper/lib.rs
@@ -1,7 +1,5 @@
-use std::fs::File;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
-use std::thread;
 use std::time::{SystemTime, UNIX_EPOCH};
 use std::{env, fs};
 
@@ -181,108 +179,6 @@ pub fn up_to_date(src: &Path, dst: &Path) -> bool {
     }
 }
 
-#[must_use]
-pub struct NativeLibBoilerplate {
-    pub src_dir: PathBuf,
-    pub out_dir: PathBuf,
-}
-
-impl NativeLibBoilerplate {
-    /// On macOS we don't want to ship the exact filename that compiler-rt builds.
-    /// This conflicts with the system and ours is likely a wildly different
-    /// version, so they can't be substituted.
-    ///
-    /// As a result, we rename it here but we need to also use
-    /// `install_name_tool` on macOS to rename the commands listed inside of it to
-    /// ensure it's linked against correctly.
-    pub fn fixup_sanitizer_lib_name(&self, sanitizer_name: &str) {
-        if env::var("TARGET").unwrap() != "x86_64-apple-darwin" {
-            return;
-        }
-
-        let dir = self.out_dir.join("build/lib/darwin");
-        let name = format!("clang_rt.{}_osx_dynamic", sanitizer_name);
-        let src = dir.join(&format!("lib{}.dylib", name));
-        let new_name = format!("lib__rustc__{}.dylib", name);
-        let dst = dir.join(&new_name);
-
-        println!("{} => {}", src.display(), dst.display());
-        fs::rename(&src, &dst).unwrap();
-        let status = Command::new("install_name_tool")
-            .arg("-id")
-            .arg(format!("@rpath/{}", new_name))
-            .arg(&dst)
-            .status()
-            .expect("failed to execute `install_name_tool`");
-        assert!(status.success());
-    }
-}
-
-impl Drop for NativeLibBoilerplate {
-    fn drop(&mut self) {
-        if !thread::panicking() {
-            t!(File::create(self.out_dir.join("rustbuild.timestamp")));
-        }
-    }
-}
-
-// Perform standard preparations for native libraries that are build only once for all stages.
-// Emit rerun-if-changed and linking attributes for Cargo, check if any source files are
-// updated, calculate paths used later in actual build with CMake/make or C/C++ compiler.
-// If Err is returned, then everything is up-to-date and further build actions can be skipped.
-// Timestamps are created automatically when the result of `native_lib_boilerplate` goes out
-// of scope, so all the build actions should be completed until then.
-pub fn native_lib_boilerplate(
-    src_dir: &Path,
-    out_name: &str,
-    link_name: &str,
-    search_subdir: &str,
-) -> Result<NativeLibBoilerplate, ()> {
-    rerun_if_changed_anything_in_dir(src_dir);
-
-    let out_dir =
-        env::var_os("RUSTBUILD_NATIVE_DIR").unwrap_or_else(|| env::var_os("OUT_DIR").unwrap());
-    let out_dir = PathBuf::from(out_dir).join(out_name);
-    t!(fs::create_dir_all(&out_dir));
-    if link_name.contains('=') {
-        println!("cargo:rustc-link-lib={}", link_name);
-    } else {
-        println!("cargo:rustc-link-lib=static={}", link_name);
-    }
-    println!("cargo:rustc-link-search=native={}", out_dir.join(search_subdir).display());
-
-    let timestamp = out_dir.join("rustbuild.timestamp");
-    if !up_to_date(Path::new("build.rs"), &timestamp) || !up_to_date(src_dir, &timestamp) {
-        Ok(NativeLibBoilerplate { src_dir: src_dir.to_path_buf(), out_dir })
-    } else {
-        Err(())
-    }
-}
-
-pub fn sanitizer_lib_boilerplate(
-    sanitizer_name: &str,
-) -> Result<(NativeLibBoilerplate, String), ()> {
-    let (link_name, search_path, apple) = match &*env::var("TARGET").unwrap() {
-        "x86_64-unknown-linux-gnu" => {
-            (format!("clang_rt.{}-x86_64", sanitizer_name), "build/lib/linux", false)
-        }
-        "x86_64-apple-darwin" => {
-            (format!("clang_rt.{}_osx_dynamic", sanitizer_name), "build/lib/darwin", true)
-        }
-        _ => return Err(()),
-    };
-    let to_link = if apple {
-        format!("dylib=__rustc__{}", link_name)
-    } else {
-        format!("static={}", link_name)
-    };
-    // This env var is provided by rustbuild to tell us where `compiler-rt`
-    // lives.
-    let dir = env::var_os("RUST_COMPILER_RT_ROOT").unwrap();
-    let lib = native_lib_boilerplate(dir.as_ref(), sanitizer_name, &to_link, search_path)?;
-    Ok((lib, link_name))
-}
-
 fn dir_up_to_date(src: &Path, threshold: SystemTime) -> bool {
     t!(fs::read_dir(src)).map(|e| t!(e)).all(|e| {
         let meta = t!(e.metadata());
diff --git a/src/librustc_asan/Cargo.toml b/src/librustc_asan/Cargo.toml
deleted file mode 100644
index df117de8720..00000000000
--- a/src/librustc_asan/Cargo.toml
+++ /dev/null
@@ -1,20 +0,0 @@
-[package]
-authors = ["The Rust Project Developers"]
-build = "build.rs"
-name = "rustc_asan"
-version = "0.0.0"
-edition = "2018"
-
-[lib]
-name = "rustc_asan"
-path = "lib.rs"
-test = false
-
-[build-dependencies]
-build_helper = { path = "../build_helper" }
-cmake = "0.1.38"
-
-[dependencies]
-alloc = { path = "../liballoc" }
-core = { path = "../libcore" }
-compiler_builtins = "0.1.0"
diff --git a/src/librustc_asan/build.rs b/src/librustc_asan/build.rs
deleted file mode 100644
index e276dc16c35..00000000000
--- a/src/librustc_asan/build.rs
+++ /dev/null
@@ -1,30 +0,0 @@
-use build_helper::sanitizer_lib_boilerplate;
-use std::env;
-
-use cmake::Config;
-
-fn main() {
-    println!("cargo:rerun-if-env-changed=RUSTC_BUILD_SANITIZERS");
-    if env::var("RUSTC_BUILD_SANITIZERS") != Ok("1".to_string()) {
-        return;
-    }
-    if let Some(llvm_config) = env::var_os("LLVM_CONFIG") {
-        build_helper::restore_library_path();
-
-        let (native, target) = match sanitizer_lib_boilerplate("asan") {
-            Ok(native) => native,
-            _ => return,
-        };
-
-        Config::new(&native.src_dir)
-            .define("COMPILER_RT_BUILD_SANITIZERS", "ON")
-            .define("COMPILER_RT_BUILD_BUILTINS", "OFF")
-            .define("COMPILER_RT_BUILD_XRAY", "OFF")
-            .define("LLVM_CONFIG_PATH", llvm_config)
-            .out_dir(&native.out_dir)
-            .build_target(&target)
-            .build();
-        native.fixup_sanitizer_lib_name("asan");
-    }
-    println!("cargo:rerun-if-env-changed=LLVM_CONFIG");
-}
diff --git a/src/librustc_asan/lib.rs b/src/librustc_asan/lib.rs
deleted file mode 100644
index bdbc154f4e8..00000000000
--- a/src/librustc_asan/lib.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-#![sanitizer_runtime]
-#![feature(nll)]
-#![feature(sanitizer_runtime)]
-#![feature(staged_api)]
-#![no_std]
-#![unstable(
-    feature = "sanitizer_runtime_lib",
-    reason = "internal implementation detail of sanitizers",
-    issue = "none"
-)]
diff --git a/src/librustc_lsan/Cargo.toml b/src/librustc_lsan/Cargo.toml
deleted file mode 100644
index 9a24361f44e..00000000000
--- a/src/librustc_lsan/Cargo.toml
+++ /dev/null
@@ -1,20 +0,0 @@
-[package]
-authors = ["The Rust Project Developers"]
-build = "build.rs"
-name = "rustc_lsan"
-version = "0.0.0"
-edition = "2018"
-
-[lib]
-name = "rustc_lsan"
-path = "lib.rs"
-test = false
-
-[build-dependencies]
-build_helper = { path = "../build_helper" }
-cmake = "0.1.38"
-
-[dependencies]
-alloc = { path = "../liballoc" }
-core = { path = "../libcore" }
-compiler_builtins = "0.1.0"
diff --git a/src/librustc_lsan/build.rs b/src/librustc_lsan/build.rs
deleted file mode 100644
index 6201bc9356d..00000000000
--- a/src/librustc_lsan/build.rs
+++ /dev/null
@@ -1,29 +0,0 @@
-use build_helper::sanitizer_lib_boilerplate;
-use std::env;
-
-use cmake::Config;
-
-fn main() {
-    println!("cargo:rerun-if-env-changed=RUSTC_BUILD_SANITIZERS");
-    if env::var("RUSTC_BUILD_SANITIZERS") != Ok("1".to_string()) {
-        return;
-    }
-    if let Some(llvm_config) = env::var_os("LLVM_CONFIG") {
-        build_helper::restore_library_path();
-
-        let (native, target) = match sanitizer_lib_boilerplate("lsan") {
-            Ok(native) => native,
-            _ => return,
-        };
-
-        Config::new(&native.src_dir)
-            .define("COMPILER_RT_BUILD_SANITIZERS", "ON")
-            .define("COMPILER_RT_BUILD_BUILTINS", "OFF")
-            .define("COMPILER_RT_BUILD_XRAY", "OFF")
-            .define("LLVM_CONFIG_PATH", llvm_config)
-            .out_dir(&native.out_dir)
-            .build_target(&target)
-            .build();
-    }
-    println!("cargo:rerun-if-env-changed=LLVM_CONFIG");
-}
diff --git a/src/librustc_lsan/lib.rs b/src/librustc_lsan/lib.rs
deleted file mode 100644
index bdbc154f4e8..00000000000
--- a/src/librustc_lsan/lib.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-#![sanitizer_runtime]
-#![feature(nll)]
-#![feature(sanitizer_runtime)]
-#![feature(staged_api)]
-#![no_std]
-#![unstable(
-    feature = "sanitizer_runtime_lib",
-    reason = "internal implementation detail of sanitizers",
-    issue = "none"
-)]
diff --git a/src/librustc_msan/Cargo.toml b/src/librustc_msan/Cargo.toml
deleted file mode 100644
index bda40785725..00000000000
--- a/src/librustc_msan/Cargo.toml
+++ /dev/null
@@ -1,20 +0,0 @@
-[package]
-authors = ["The Rust Project Developers"]
-build = "build.rs"
-name = "rustc_msan"
-version = "0.0.0"
-edition = "2018"
-
-[lib]
-name = "rustc_msan"
-path = "lib.rs"
-test = false
-
-[build-dependencies]
-build_helper = { path = "../build_helper" }
-cmake = "0.1.38"
-
-[dependencies]
-alloc = { path = "../liballoc" }
-core = { path = "../libcore" }
-compiler_builtins = "0.1.0"
diff --git a/src/librustc_msan/build.rs b/src/librustc_msan/build.rs
deleted file mode 100644
index dc08d51b51c..00000000000
--- a/src/librustc_msan/build.rs
+++ /dev/null
@@ -1,29 +0,0 @@
-use build_helper::sanitizer_lib_boilerplate;
-use std::env;
-
-use cmake::Config;
-
-fn main() {
-    println!("cargo:rerun-if-env-changed=RUSTC_BUILD_SANITIZERS");
-    if env::var("RUSTC_BUILD_SANITIZERS") != Ok("1".to_string()) {
-        return;
-    }
-    if let Some(llvm_config) = env::var_os("LLVM_CONFIG") {
-        build_helper::restore_library_path();
-
-        let (native, target) = match sanitizer_lib_boilerplate("msan") {
-            Ok(native) => native,
-            _ => return,
-        };
-
-        Config::new(&native.src_dir)
-            .define("COMPILER_RT_BUILD_SANITIZERS", "ON")
-            .define("COMPILER_RT_BUILD_BUILTINS", "OFF")
-            .define("COMPILER_RT_BUILD_XRAY", "OFF")
-            .define("LLVM_CONFIG_PATH", llvm_config)
-            .out_dir(&native.out_dir)
-            .build_target(&target)
-            .build();
-    }
-    println!("cargo:rerun-if-env-changed=LLVM_CONFIG");
-}
diff --git a/src/librustc_msan/lib.rs b/src/librustc_msan/lib.rs
deleted file mode 100644
index bdbc154f4e8..00000000000
--- a/src/librustc_msan/lib.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-#![sanitizer_runtime]
-#![feature(nll)]
-#![feature(sanitizer_runtime)]
-#![feature(staged_api)]
-#![no_std]
-#![unstable(
-    feature = "sanitizer_runtime_lib",
-    reason = "internal implementation detail of sanitizers",
-    issue = "none"
-)]
diff --git a/src/librustc_tsan/Cargo.toml b/src/librustc_tsan/Cargo.toml
deleted file mode 100644
index 82045dd0cdd..00000000000
--- a/src/librustc_tsan/Cargo.toml
+++ /dev/null
@@ -1,20 +0,0 @@
-[package]
-authors = ["The Rust Project Developers"]
-build = "build.rs"
-name = "rustc_tsan"
-version = "0.0.0"
-edition = "2018"
-
-[lib]
-name = "rustc_tsan"
-path = "lib.rs"
-test = false
-
-[build-dependencies]
-build_helper = { path = "../build_helper" }
-cmake = "0.1.38"
-
-[dependencies]
-alloc = { path = "../liballoc" }
-core = { path = "../libcore" }
-compiler_builtins = "0.1.0"
diff --git a/src/librustc_tsan/build.rs b/src/librustc_tsan/build.rs
deleted file mode 100644
index 570642a2eaa..00000000000
--- a/src/librustc_tsan/build.rs
+++ /dev/null
@@ -1,30 +0,0 @@
-use build_helper::sanitizer_lib_boilerplate;
-use std::env;
-
-use cmake::Config;
-
-fn main() {
-    println!("cargo:rerun-if-env-changed=RUSTC_BUILD_SANITIZERS");
-    if env::var("RUSTC_BUILD_SANITIZERS") != Ok("1".to_string()) {
-        return;
-    }
-    if let Some(llvm_config) = env::var_os("LLVM_CONFIG") {
-        build_helper::restore_library_path();
-
-        let (native, target) = match sanitizer_lib_boilerplate("tsan") {
-            Ok(native) => native,
-            _ => return,
-        };
-
-        Config::new(&native.src_dir)
-            .define("COMPILER_RT_BUILD_SANITIZERS", "ON")
-            .define("COMPILER_RT_BUILD_BUILTINS", "OFF")
-            .define("COMPILER_RT_BUILD_XRAY", "OFF")
-            .define("LLVM_CONFIG_PATH", llvm_config)
-            .out_dir(&native.out_dir)
-            .build_target(&target)
-            .build();
-        native.fixup_sanitizer_lib_name("tsan");
-    }
-    println!("cargo:rerun-if-env-changed=LLVM_CONFIG");
-}
diff --git a/src/librustc_tsan/lib.rs b/src/librustc_tsan/lib.rs
deleted file mode 100644
index bdbc154f4e8..00000000000
--- a/src/librustc_tsan/lib.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-#![sanitizer_runtime]
-#![feature(nll)]
-#![feature(sanitizer_runtime)]
-#![feature(staged_api)]
-#![no_std]
-#![unstable(
-    feature = "sanitizer_runtime_lib",
-    reason = "internal implementation detail of sanitizers",
-    issue = "none"
-)]
diff --git a/src/libstd/Cargo.toml b/src/libstd/Cargo.toml
index a22e162bbff..c9ff93eac02 100644
--- a/src/libstd/Cargo.toml
+++ b/src/libstd/Cargo.toml
@@ -34,16 +34,6 @@ features = [ "rustc-dep-of-std" ] # enable build support for integrating into li
 [dev-dependencies]
 rand = "0.7"
 
-[target.x86_64-apple-darwin.dependencies]
-rustc_asan = { path = "../librustc_asan" }
-rustc_tsan = { path = "../librustc_tsan" }
-
-[target.x86_64-unknown-linux-gnu.dependencies]
-rustc_asan = { path = "../librustc_asan" }
-rustc_lsan = { path = "../librustc_lsan" }
-rustc_msan = { path = "../librustc_msan" }
-rustc_tsan = { path = "../librustc_tsan" }
-
 [target.'cfg(any(all(target_arch = "wasm32", not(target_os = "emscripten")), all(target_vendor = "fortanix", target_env = "sgx")))'.dependencies]
 dlmalloc = { version = "0.1", features = ['rustc-dep-of-std'] }