diff --git a/.gitmodules b/.gitmodules
index 3ff5af78097fa..1dcf9ed319f14 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -28,9 +28,6 @@
 [submodule "src/doc/rust-by-example"]
 	path = src/doc/rust-by-example
 	url = https://github.com/rust-lang/rust-by-example.git
-[submodule "src/llvm-emscripten"]
-	path = src/llvm-emscripten
-	url = https://github.com/rust-lang/llvm.git
 [submodule "src/stdarch"]
 	path = src/stdarch
 	url = https://github.com/rust-lang/stdarch.git
diff --git a/config.toml.example b/config.toml.example
index 2e3b714f9228a..be97702442609 100644
--- a/config.toml.example
+++ b/config.toml.example
@@ -374,10 +374,7 @@
 
 # This is an array of the codegen backends that will be compiled for the rustc
 # that's being compiled. The default is to only build the LLVM codegen backend,
-# but you can also optionally enable the "emscripten" backend for asm.js or
-# make this an empty array (but that probably won't get too far in the
-# bootstrap)
-# FIXME: remove the obsolete emscripten backend option.
+# and currently the only standard option supported is `"llvm"`
 #codegen-backends = ["llvm"]
 
 # This is the name of the directory in which codegen backends will get installed
diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 65129eeeec504..4caf36a6f2a51 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -734,10 +734,6 @@ def update_submodules(self):
             if module.endswith("llvm-project"):
                 if self.get_toml('llvm-config') and self.get_toml('lld') != 'true':
                     continue
-            if module.endswith("llvm-emscripten"):
-                backends = self.get_toml('codegen-backends')
-                if backends is None or not 'emscripten' in backends:
-                    continue
             check = self.check_submodule(module, slow_submodules)
             filtered_submodules.append((module, check))
             submodules_names.append(module)
diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 6ea32edfb208b..5074b035789ae 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -210,7 +210,6 @@ pub fn std_cargo(builder: &Builder<'_>,
             // config.toml equivalent) is used
             let llvm_config = builder.ensure(native::Llvm {
                 target: builder.config.build,
-                emscripten: false,
             });
             cargo.env("LLVM_CONFIG", llvm_config);
             cargo.env("RUSTC_BUILD_SANITIZERS", "1");
@@ -615,36 +614,27 @@ pub fn build_codegen_backend(builder: &Builder<'_>,
                              compiler: &Compiler,
                              target: Interned<String>,
                              backend: Interned<String>) -> String {
-    let mut features = String::new();
-
     match &*backend {
-        "llvm" | "emscripten" => {
+        "llvm" => {
             // Build LLVM for our target. This will implicitly build the
             // host LLVM if necessary.
             let llvm_config = builder.ensure(native::Llvm {
                 target,
-                emscripten: backend == "emscripten",
             });
 
-            if backend == "emscripten" {
-                features.push_str(" emscripten");
-            }
-
             builder.info(&format!("Building stage{} codegen artifacts ({} -> {}, {})",
                      compiler.stage, &compiler.host, target, backend));
 
             // Pass down configuration from the LLVM build into the build of
             // librustc_llvm and librustc_codegen_llvm.
-            if builder.is_rust_llvm(target) && backend != "emscripten" {
+            if builder.is_rust_llvm(target) {
                 cargo.env("LLVM_RUSTLLVM", "1");
             }
 
             cargo.env("LLVM_CONFIG", &llvm_config);
-            if backend != "emscripten" {
-                let target_config = builder.config.target_config.get(&target);
-                if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
-                    cargo.env("CFG_LLVM_ROOT", s);
-                }
+            let target_config = builder.config.target_config.get(&target);
+            if let Some(s) = target_config.and_then(|c| c.llvm_config.as_ref()) {
+                cargo.env("CFG_LLVM_ROOT", s);
             }
             // Some LLVM linker flags (-L and -l) may be needed to link librustc_llvm.
             if let Some(ref s) = builder.config.llvm_ldflags {
@@ -662,9 +652,7 @@ pub fn build_codegen_backend(builder: &Builder<'_>,
                                          "libstdc++.a");
                 cargo.env("LLVM_STATIC_STDCPP", file);
             }
-            if builder.config.llvm_link_shared ||
-                (builder.config.llvm_thin_lto && backend != "emscripten")
-            {
+            if builder.config.llvm_link_shared || builder.config.llvm_thin_lto {
                 cargo.env("LLVM_LINK_SHARED", "1");
             }
             if builder.config.llvm_use_libcxx {
@@ -676,8 +664,7 @@ pub fn build_codegen_backend(builder: &Builder<'_>,
         }
         _ => panic!("unknown backend: {}", backend),
     }
-
-    features
+    String::new()
 }
 
 /// Creates the `codegen-backends` folder for a compiler that's about to be
diff --git a/src/bootstrap/config.rs b/src/bootstrap/config.rs
index 52b5cd888df9c..441bb8d68faf9 100644
--- a/src/bootstrap/config.rs
+++ b/src/bootstrap/config.rs
@@ -668,7 +668,6 @@ impl Config {
 
     pub fn llvm_enabled(&self) -> bool {
         self.rust_codegen_backends.contains(&INTERNER.intern_str("llvm"))
-        || self.rust_codegen_backends.contains(&INTERNER.intern_str("emscripten"))
     }
 }
 
diff --git a/src/bootstrap/configure.py b/src/bootstrap/configure.py
index 346f0cb2039c0..76509134f7ccd 100755
--- a/src/bootstrap/configure.py
+++ b/src/bootstrap/configure.py
@@ -55,7 +55,6 @@ def v(*args):
 o("dist-src", "rust.dist-src", "when building tarballs enables building a source tarball")
 o("cargo-native-static", "build.cargo-native-static", "static native libraries in cargo")
 o("profiler", "build.profiler", "build the profiler runtime")
-o("emscripten", None, "compile the emscripten backend as well as LLVM")
 o("full-tools", None, "enable all tools")
 o("lld", "rust.lld", "build lld")
 o("lldb", "rust.lldb", "build lldb")
@@ -335,10 +334,8 @@ def set(key, value):
         set('build.host', value.split(','))
     elif option.name == 'target':
         set('build.target', value.split(','))
-    elif option.name == 'emscripten':
-        set('rust.codegen-backends', ['llvm', 'emscripten'])
     elif option.name == 'full-tools':
-        set('rust.codegen-backends', ['llvm', 'emscripten'])
+        set('rust.codegen-backends', ['llvm'])
         set('rust.lld', True)
         set('rust.llvm-tools', True)
         set('build.extended', True)
diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
index d9dff77a30e6b..514ad11444917 100644
--- a/src/bootstrap/dist.rs
+++ b/src/bootstrap/dist.rs
@@ -826,7 +826,6 @@ fn copy_src_dirs(builder: &Builder<'_>, src_dirs: &[&str], exclude_dirs: &[&str]
 
         const LLVM_TEST: &[&str] = &[
             "llvm-project/llvm/test", "llvm-project\\llvm\\test",
-            "llvm-emscripten/test", "llvm-emscripten\\test",
         ];
         if LLVM_TEST.iter().any(|path| spath.contains(path)) &&
             (spath.ends_with(".ll") ||
@@ -834,9 +833,6 @@ fn copy_src_dirs(builder: &Builder<'_>, src_dirs: &[&str], exclude_dirs: &[&str]
              spath.ends_with(".s")) {
             return false
         }
-        if spath.contains("test/emscripten") || spath.contains("test\\emscripten") {
-            return false
-        }
 
         let full_path = Path::new(dir).join(path);
         if exclude_dirs.iter().any(|excl| full_path == Path::new(excl)) {
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 6fc72fa0b2a37..a182405f3b2d4 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -232,7 +232,6 @@ pub struct Build {
     miri_info: channel::GitInfo,
     rustfmt_info: channel::GitInfo,
     in_tree_llvm_info: channel::GitInfo,
-    emscripten_llvm_info: channel::GitInfo,
     local_rebuild: bool,
     fail_fast: bool,
     doc_tests: DocTests,
@@ -351,7 +350,6 @@ impl Build {
 
         // we always try to use git for LLVM builds
         let in_tree_llvm_info = channel::GitInfo::new(false, &src.join("src/llvm-project"));
-        let emscripten_llvm_info = channel::GitInfo::new(false, &src.join("src/llvm-emscripten"));
 
         let mut build = Build {
             initial_rustc: config.initial_rustc.clone(),
@@ -376,7 +374,6 @@ impl Build {
             miri_info,
             rustfmt_info,
             in_tree_llvm_info,
-            emscripten_llvm_info,
             cc: HashMap::new(),
             cxx: HashMap::new(),
             ar: HashMap::new(),
@@ -553,10 +550,6 @@ impl Build {
         self.out.join(&*target).join("llvm")
     }
 
-    fn emscripten_llvm_out(&self, target: Interned<String>) -> PathBuf {
-        self.out.join(&*target).join("llvm-emscripten")
-    }
-
     fn lld_out(&self, target: Interned<String>) -> PathBuf {
         self.out.join(&*target).join("lld")
     }
diff --git a/src/bootstrap/native.rs b/src/bootstrap/native.rs
index fb308bc35ebc5..97cdd25680162 100644
--- a/src/bootstrap/native.rs
+++ b/src/bootstrap/native.rs
@@ -28,7 +28,6 @@ use crate::GitRepo;
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
 pub struct Llvm {
     pub target: Interned<String>,
-    pub emscripten: bool,
 }
 
 impl Step for Llvm {
@@ -40,46 +39,35 @@ impl Step for Llvm {
         run.path("src/llvm-project")
             .path("src/llvm-project/llvm")
             .path("src/llvm")
-            .path("src/llvm-emscripten")
     }
 
     fn make_run(run: RunConfig<'_>) {
-        let emscripten = run.path.ends_with("llvm-emscripten");
         run.builder.ensure(Llvm {
             target: run.target,
-            emscripten,
         });
     }
 
     /// Compile LLVM for `target`.
     fn run(self, builder: &Builder<'_>) -> PathBuf {
         let target = self.target;
-        let emscripten = self.emscripten;
 
         // If we're using a custom LLVM bail out here, but we can only use a
         // custom LLVM for the build triple.
-        if !self.emscripten {
-            if let Some(config) = builder.config.target_config.get(&target) {
-                if let Some(ref s) = config.llvm_config {
-                    check_llvm_version(builder, s);
-                    return s.to_path_buf()
-                }
+        if let Some(config) = builder.config.target_config.get(&target) {
+            if let Some(ref s) = config.llvm_config {
+                check_llvm_version(builder, s);
+                return s.to_path_buf()
             }
         }
 
-        let (llvm_info, root, out_dir, llvm_config_ret_dir) = if emscripten {
-            let info = &builder.emscripten_llvm_info;
-            let dir = builder.emscripten_llvm_out(target);
-            let config_dir = dir.join("bin");
-            (info, "src/llvm-emscripten", dir, config_dir)
-        } else {
-            let info = &builder.in_tree_llvm_info;
-            let mut dir = builder.llvm_out(builder.config.build);
-            if !builder.config.build.contains("msvc") || builder.config.ninja {
-                dir.push("build");
-            }
-            (info, "src/llvm-project/llvm", builder.llvm_out(target), dir.join("bin"))
-        };
+        let llvm_info = &builder.in_tree_llvm_info;
+        let root = "src/llvm-project/llvm";
+        let out_dir = builder.llvm_out(target);
+        let mut llvm_config_ret_dir = builder.llvm_out(builder.config.build);
+        if !builder.config.build.contains("msvc") || builder.config.ninja {
+            llvm_config_ret_dir.push("build");
+        }
+        llvm_config_ret_dir.push("bin");
 
         let build_llvm_config = llvm_config_ret_dir
             .join(exe("llvm-config", &*builder.config.build));
@@ -107,8 +95,7 @@ impl Step for Llvm {
             }
         }
 
-        let descriptor = if emscripten { "Emscripten " } else { "" };
-        builder.info(&format!("Building {}LLVM for {}", descriptor, target));
+        builder.info(&format!("Building LLVM for {}", target));
         let _time = util::timeit(&builder);
         t!(fs::create_dir_all(&out_dir));
 
@@ -123,23 +110,15 @@ impl Step for Llvm {
 
         // NOTE: remember to also update `config.toml.example` when changing the
         // defaults!
-        let llvm_targets = if self.emscripten {
-            "JSBackend"
-        } else {
-            match builder.config.llvm_targets {
-                Some(ref s) => s,
-                None => "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;\
-                         Sparc;SystemZ;WebAssembly;X86",
-            }
+        let llvm_targets = match &builder.config.llvm_targets {
+            Some(s) => s,
+            None => "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;\
+                     Sparc;SystemZ;WebAssembly;X86",
         };
 
-        let llvm_exp_targets = if self.emscripten {
-            ""
-        } else {
-            match builder.config.llvm_experimental_targets {
-                Some(ref s) => s,
-                None => "",
-            }
+        let llvm_exp_targets = match builder.config.llvm_experimental_targets {
+            Some(ref s) => s,
+            None => "",
         };
 
         let assertions = if builder.config.llvm_assertions {"ON"} else {"OFF"};
@@ -163,25 +142,23 @@ impl Step for Llvm {
            .define("LLVM_TARGET_ARCH", target.split('-').next().unwrap())
            .define("LLVM_DEFAULT_TARGET_TRIPLE", target);
 
-        if builder.config.llvm_thin_lto && !emscripten {
+        if builder.config.llvm_thin_lto {
             cfg.define("LLVM_ENABLE_LTO", "Thin");
             if !target.contains("apple") {
                cfg.define("LLVM_ENABLE_LLD", "ON");
             }
         }
 
-        let want_lldb = builder.config.lldb_enabled && !self.emscripten;
-
         // This setting makes the LLVM tools link to the dynamic LLVM library,
         // which saves both memory during parallel links and overall disk space
         // for the tools. We don't do this on every platform as it doesn't work
         // equally well everywhere.
-        if builder.llvm_link_tools_dynamically(target) && !emscripten {
+        if builder.llvm_link_tools_dynamically(target) {
             cfg.define("LLVM_LINK_LLVM_DYLIB", "ON");
         }
 
         // For distribution we want the LLVM tools to be *statically* linked to libstdc++
-        if builder.config.llvm_tools_enabled || want_lldb {
+        if builder.config.llvm_tools_enabled || builder.config.lldb_enabled {
             if !target.contains("windows") {
                 if target.contains("apple") {
                     cfg.define("CMAKE_EXE_LINKER_FLAGS", "-static-libstdc++");
@@ -209,7 +186,7 @@ impl Step for Llvm {
             enabled_llvm_projects.push("compiler-rt");
         }
 
-        if want_lldb {
+        if builder.config.lldb_enabled {
             enabled_llvm_projects.push("clang");
             enabled_llvm_projects.push("lldb");
             // For the time being, disable code signing.
@@ -234,10 +211,9 @@ impl Step for Llvm {
         }
 
         // http://llvm.org/docs/HowToCrossCompileLLVM.html
-        if target != builder.config.build && !emscripten {
+        if target != builder.config.build {
             builder.ensure(Llvm {
                 target: builder.config.build,
-                emscripten: false,
             });
             // FIXME: if the llvm root for the build triple is overridden then we
             //        should use llvm-tblgen from there, also should verify that it
@@ -481,7 +457,6 @@ impl Step for Lld {
 
         let llvm_config = builder.ensure(Llvm {
             target: self.target,
-            emscripten: false,
         });
 
         let out_dir = builder.lld_out(target);
diff --git a/src/bootstrap/test.rs b/src/bootstrap/test.rs
index 0b7aa0750a199..7ed67c6c7c5d5 100644
--- a/src/bootstrap/test.rs
+++ b/src/bootstrap/test.rs
@@ -1163,7 +1163,7 @@ impl Step for Compiletest {
                     }).to_string()
             })
         };
-        let lldb_exe = if builder.config.lldb_enabled && !target.contains("emscripten") {
+        let lldb_exe = if builder.config.lldb_enabled {
             // Test against the lldb that was just built.
             builder.llvm_out(target).join("bin").join("lldb")
         } else {
@@ -1232,7 +1232,6 @@ impl Step for Compiletest {
         if builder.config.llvm_enabled() {
             let llvm_config = builder.ensure(native::Llvm {
                 target: builder.config.build,
-                emscripten: false,
             });
             if !builder.config.dry_run {
                 let llvm_version = output(Command::new(&llvm_config).arg("--version"));
diff --git a/src/ci/init_repo.sh b/src/ci/init_repo.sh
index c7c3b0a5fbf5b..92c6e546a3895 100755
--- a/src/ci/init_repo.sh
+++ b/src/ci/init_repo.sh
@@ -47,7 +47,7 @@ function fetch_github_commit_archive {
     rm $cached
 }
 
-included="src/llvm-project src/llvm-emscripten src/doc/book src/doc/rust-by-example"
+included="src/llvm-project src/doc/book src/doc/rust-by-example"
 modules="$(git config --file .gitmodules --get-regexp '\.path$' | cut -d' ' -f2)"
 modules=($modules)
 use_git=""
diff --git a/src/librustc_codegen_llvm/Cargo.toml b/src/librustc_codegen_llvm/Cargo.toml
index 98efa6a5804bd..867bbd22cfbbb 100644
--- a/src/librustc_codegen_llvm/Cargo.toml
+++ b/src/librustc_codegen_llvm/Cargo.toml
@@ -12,9 +12,3 @@ test = false
 
 [dependencies]
 rustc_llvm = { path = "../librustc_llvm" }
-
-[features]
-# This is used to convince Cargo to separately cache builds of `rustc_codegen_llvm`
-# when this option is enabled or not. That way we can build two, cache two
-# artifacts, and have nice speedy rebuilds.
-emscripten = ["rustc_llvm/emscripten"]
diff --git a/src/llvm-emscripten b/src/llvm-emscripten
deleted file mode 160000
index 7f23313edff8b..0000000000000
--- a/src/llvm-emscripten
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 7f23313edff8beccb3fe44b815714269c5124c15
diff --git a/src/tools/tidy/src/lib.rs b/src/tools/tidy/src/lib.rs
index c76cc4cff7f87..d9db68ff66efd 100644
--- a/src/tools/tidy/src/lib.rs
+++ b/src/tools/tidy/src/lib.rs
@@ -46,7 +46,6 @@ pub mod error_codes_check;
 
 fn filter_dirs(path: &Path) -> bool {
     let skip = [
-        "src/llvm-emscripten",
         "src/llvm-project",
         "src/stdarch",
         "src/tools/cargo",