Auto merge of #65501 - alexcrichton:remove-emscripten-backend, r=Mark-Simulacrum

Remove `src/llvm-emscripten` submodule

With #65251 landed there's no need to build two LLVM backends and ship
them with rustc, every target we have now uses the same LLVM backend!

This removes the `src/llvm-emscripten` submodule and additionally
removes all support from rustbuild for building the emscripten LLVM
backend. Multiple codegen backend support is left in place for now, and
this is intended to be an easy 10-15 minute win on CI times by avoiding
having to build LLVM twice.

8 files changed, 34 insertions, 92 deletions

diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 65129eeeec5..4caf36a6f2a 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -734,10 +734,6 @@ class RustBuild(object):
             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 6ea32edfb20..5074b035789 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 52b5cd888df..441bb8d68fa 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 346f0cb2039..76509134f7c 100755
--- a/src/bootstrap/configure.py
+++ b/src/bootstrap/configure.py
@@ -55,7 +55,6 @@ o("sanitizers", "build.sanitizers", "build the sanitizer runtimes (asan, lsan, m
 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 @@ for key in known_args:
         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 d9dff77a30e..514ad114449 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 6fc72fa0b2a..a182405f3b2 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 fb308bc35eb..97cdd256801 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 0b7aa0750a1..7ed67c6c7c5 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"));