Make miri a subtree instead of a submodule

.gitmodules

@@ -13,9 +13,6 @@
 [submodule "src/doc/book"]
 	path = src/doc/book
 	url = /~https://github.com/rust-lang/book.git
-[submodule "src/tools/miri"]
-	path = src/tools/miri
-	url = /~https://github.com/rust-lang/miri.git
 [submodule "src/doc/rust-by-example"]
 	path = src/doc/rust-by-example
 	url = /~https://github.com/rust-lang/rust-by-example.git

src/README.md

@@ -2,7 +2,7 @@ This directory contains the source code of the rust project, including:
 
 - The test suite
 - The bootstrapping build system
-- Various submodules for tools, like cargo, miri, etc.
+- Various submodules for tools, like cargo, etc.
 
 For more information on how various parts of the compiler work, see the [rustc dev guide].
 

src/bootstrap/check.rs

@@ -456,6 +456,8 @@ tool_check_step!(Rustdoc, "src/tools/rustdoc", "src/librustdoc", SourceType::InT
 // behavior, treat it as in-tree so that any new warnings in clippy will be
 // rejected.
 tool_check_step!(Clippy, "src/tools/clippy", SourceType::InTree);
+// Miri on the other hand is treated as out of tree, since InTree also causes it to
+// be run as part of `check`, which can fail on platforms which libffi-sys has no support for.
 tool_check_step!(Miri, "src/tools/miri", SourceType::Submodule);
 tool_check_step!(Rls, "src/tools/rls", SourceType::InTree);
 tool_check_step!(Rustfmt, "src/tools/rustfmt", SourceType::InTree);

src/bootstrap/dist.rs

@@ -35,18 +35,6 @@ pub fn tmpdir(builder: &Builder<'_>) -> PathBuf {
     builder.out.join("tmp/dist")
 }
 
-fn missing_tool(tool_name: &str, skip: bool) {
-    if skip {
-        println!("Unable to build {}, skipping dist", tool_name)
-    } else {
-        let help = "note: not all tools are available on all nightlies\nhelp: see https://forge.rust-lang.org/infra/toolstate.html for more information";
-        panic!(
-            "Unable to build submodule tool {} (use `missing-tools = true` to ignore this failure)\n{}",
-            tool_name, help
-        )
-    }
-}
-
 fn should_build_extended_tool(builder: &Builder<'_>, tool: &str) -> bool {
     if !builder.config.extended {
         return false;
@@ -1209,18 +1197,9 @@ impl Step for Miri {
         let compiler = self.compiler;
         let target = self.target;
 
-        let miri = builder
-            .ensure(tool::Miri { compiler, target, extra_features: Vec::new() })
-            .or_else(|| {
-                missing_tool("miri", builder.build.config.missing_tools);
-                None
-            })?;
-        let cargomiri = builder
-            .ensure(tool::CargoMiri { compiler, target, extra_features: Vec::new() })
-            .or_else(|| {
-                missing_tool("cargo miri", builder.build.config.missing_tools);
-                None
-            })?;
+        let miri = builder.ensure(tool::Miri { compiler, target, extra_features: Vec::new() })?;
+        let cargomiri =
+            builder.ensure(tool::CargoMiri { compiler, target, extra_features: Vec::new() })?;
 
         let mut tarball = Tarball::new(builder, "miri", &target.triple);
         tarball.set_overlay(OverlayKind::Miri);
@@ -1451,7 +1430,7 @@ impl Step for Extended {
 
         let xform = |p: &Path| {
             let mut contents = t!(fs::read_to_string(p));
-            for tool in &["rust-demangler", "rust-analyzer", "miri", "rustfmt"] {
+            for tool in &["rust-demangler", "rust-analyzer", "rustfmt"] {
                 if !built_tools.contains(tool) {
                     contents = filter(&contents, tool);
                 }
@@ -1491,7 +1470,8 @@ impl Step for Extended {
             prepare("rust-std");
             prepare("rust-analysis");
             prepare("clippy");
-            for tool in &["rust-docs", "rust-demangler", "rust-analyzer", "miri"] {
+            prepare("miri");
+            for tool in &["rust-docs", "rust-demangler", "rust-analyzer"] {
                 if built_tools.contains(tool) {
                     prepare(tool);
                 }
@@ -1550,7 +1530,8 @@ impl Step for Extended {
             prepare("rust-docs");
             prepare("rust-std");
             prepare("clippy");
-            for tool in &["rust-demangler", "rust-analyzer", "miri"] {
+            prepare("miri");
+            for tool in &["rust-demangler", "rust-analyzer"] {
                 if built_tools.contains(tool) {
                     prepare(tool);
                 }
@@ -1689,25 +1670,23 @@ impl Step for Extended {
                         .arg(etc.join("msi/remove-duplicates.xsl")),
                 );
             }
-            if built_tools.contains("miri") {
-                builder.run(
-                    Command::new(&heat)
-                        .current_dir(&exe)
-                        .arg("dir")
-                        .arg("miri")
-                        .args(&heat_flags)
-                        .arg("-cg")
-                        .arg("MiriGroup")
-                        .arg("-dr")
-                        .arg("Miri")
-                        .arg("-var")
-                        .arg("var.MiriDir")
-                        .arg("-out")
-                        .arg(exe.join("MiriGroup.wxs"))
-                        .arg("-t")
-                        .arg(etc.join("msi/remove-duplicates.xsl")),
-                );
-            }
+            builder.run(
+                Command::new(&heat)
+                    .current_dir(&exe)
+                    .arg("dir")
+                    .arg("miri")
+                    .args(&heat_flags)
+                    .arg("-cg")
+                    .arg("MiriGroup")
+                    .arg("-dr")
+                    .arg("Miri")
+                    .arg("-var")
+                    .arg("var.MiriDir")
+                    .arg("-out")
+                    .arg(exe.join("MiriGroup.wxs"))
+                    .arg("-t")
+                    .arg(etc.join("msi/remove-duplicates.xsl")),
+            );
             builder.run(
                 Command::new(&heat)
                     .current_dir(&exe)
@@ -1755,6 +1734,7 @@ impl Step for Extended {
                     .arg("-dStdDir=rust-std")
                     .arg("-dAnalysisDir=rust-analysis")
                     .arg("-dClippyDir=clippy")
+                    .arg("-dMiriDir=miri")
                     .arg("-arch")
                     .arg(&arch)
                     .arg("-out")
@@ -1768,9 +1748,6 @@ impl Step for Extended {
                 if built_tools.contains("rust-analyzer") {
                     cmd.arg("-dRustAnalyzerDir=rust-analyzer");
                 }
-                if built_tools.contains("miri") {
-                    cmd.arg("-dMiriDir=miri");
-                }
                 if target.ends_with("windows-gnu") {
                     cmd.arg("-dGccDir=rust-mingw");
                 }
@@ -1784,15 +1761,13 @@ impl Step for Extended {
             candle("CargoGroup.wxs".as_ref());
             candle("StdGroup.wxs".as_ref());
             candle("ClippyGroup.wxs".as_ref());
+            candle("MiriGroup.wxs".as_ref());
             if built_tools.contains("rust-demangler") {
                 candle("RustDemanglerGroup.wxs".as_ref());
             }
             if built_tools.contains("rust-analyzer") {
                 candle("RustAnalyzerGroup.wxs".as_ref());
             }
-            if built_tools.contains("miri") {
-                candle("MiriGroup.wxs".as_ref());
-            }
             candle("AnalysisGroup.wxs".as_ref());
 
             if target.ends_with("windows-gnu") {
@@ -1822,6 +1797,7 @@ impl Step for Extended {
                 .arg("StdGroup.wixobj")
                 .arg("AnalysisGroup.wixobj")
                 .arg("ClippyGroup.wixobj")
+                .arg("MiriGroup.wixobj")
                 .current_dir(&exe);
 
             if built_tools.contains("rust-analyzer") {
@@ -1830,9 +1806,6 @@ impl Step for Extended {
             if built_tools.contains("rust-demangler") {
                 cmd.arg("RustDemanglerGroup.wixobj");
             }
-            if built_tools.contains("miri") {
-                cmd.arg("MiriGroup.wixobj");
-            }
 
             if target.ends_with("windows-gnu") {
                 cmd.arg("GccGroup.wixobj");

src/bootstrap/install.rs

@@ -200,13 +200,10 @@ install!((self, builder, _config),
         install_sh(builder, "clippy", self.compiler.stage, Some(self.target), &tarball);
     };
     Miri, alias = "miri", Self::should_build(_config), only_hosts: true, {
-        if let Some(tarball) = builder.ensure(dist::Miri { compiler: self.compiler, target: self.target }) {
-            install_sh(builder, "miri", self.compiler.stage, Some(self.target), &tarball);
-        } else {
-            builder.info(
-                &format!("skipping Install miri stage{} ({})", self.compiler.stage, self.target),
-            );
-        }
+        let tarball = builder
+            .ensure(dist::Miri { compiler: self.compiler, target: self.target })
+            .expect("missing miri");
+        install_sh(builder, "miri", self.compiler.stage, Some(self.target), &tarball);
     };
     Rustfmt, alias = "rustfmt", Self::should_build(_config), only_hosts: true, {
         if let Some(tarball) = builder.ensure(dist::Rustfmt {

src/bootstrap/lib.rs

@@ -540,13 +540,8 @@ impl Build {
 
         // Make sure we update these before gathering metadata so we don't get an error about missing
         // Cargo.toml files.
-        let rust_submodules = [
-            "src/tools/rust-installer",
-            "src/tools/cargo",
-            "src/tools/miri",
-            "library/backtrace",
-            "library/stdarch",
-        ];
+        let rust_submodules =
+            ["src/tools/rust-installer", "src/tools/cargo", "library/backtrace", "library/stdarch"];
         for s in rust_submodules {
             build.update_submodule(Path::new(s));
         }