use BootstrapCommand for tool::ToolBuild step

Previously, we were running bare commands for `ToolBuild` step and
were unable to utilize many of the flags that are already handled by
`compile::cargo_run`. This change improves `ToolBuild` to use `compile::cargo_run`,
allowing us to fully benefit from all the flags supported by the bootstrap cargo.

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/src/core/build_steps/check.rs

@@ -88,7 +88,8 @@ impl Step for Std {
             vec![],
             true,
             false,
-        );
+        )
+        .unwrap();
 
         // We skip populating the sysroot in non-zero stage because that'll lead
         // to rlib/rmeta conflicts if std gets built during this session.
@@ -145,7 +146,8 @@ impl Step for Std {
             vec![],
             true,
             false,
-        );
+        )
+        .unwrap();
     }
 }
 
@@ -242,7 +244,8 @@ impl Step for Rustc {
             vec![],
             true,
             false,
-        );
+        )
+        .unwrap();
 
         let libdir = builder.sysroot_libdir(compiler, target);
         let hostdir = builder.sysroot_libdir(compiler, compiler.host);
@@ -308,7 +311,8 @@ impl Step for CodegenBackend {
             vec![],
             true,
             false,
-        );
+        )
+        .unwrap();
     }
 }
 
@@ -374,7 +378,8 @@ impl Step for RustAnalyzer {
             vec![],
             true,
             false,
-        );
+        )
+        .unwrap();
 
         /// Cargo's output path in a given stage, compiled by a particular
         /// compiler for the specified target.
@@ -437,7 +442,7 @@ macro_rules! tool_check_step {
                     vec![],
                     true,
                     false,
-                );
+                ).unwrap();
 
                 /// Cargo's output path in a given stage, compiled by a particular
                 /// compiler for the specified target.

src/bootstrap/src/core/build_steps/clippy.rs

@@ -152,7 +152,8 @@ impl Step for Std {
             vec![],
             true,
             false,
-        );
+        )
+        .unwrap();
     }
 }
 
@@ -226,7 +227,8 @@ impl Step for Rustc {
             vec![],
             true,
             false,
-        );
+        )
+        .unwrap();
     }
 }
 
@@ -295,7 +297,7 @@ macro_rules! lint_any {
                     vec![],
                     true,
                     false,
-                );
+                ).unwrap();
             }
         }
         )+

src/bootstrap/src/core/build_steps/compile.rs

@@ -27,6 +27,7 @@ use crate::core::builder::crate_description;
 use crate::core::builder::Cargo;
 use crate::core::builder::{Builder, Kind, PathSet, RunConfig, ShouldRun, Step, TaskPath};
 use crate::core::config::{DebuginfoLevel, LlvmLibunwind, RustcLto, TargetSelection};
+use crate::utils::exec::BehaviorOnFailure;
 use crate::utils::helpers::{
     exe, get_clang_cl_resource_dir, is_debug_info, is_dylib, output, symlink_dir, t, up_to_date,
 };
@@ -289,7 +290,8 @@ impl Step for Std {
             target_deps,
             self.is_for_mir_opt_tests, // is_check
             false,
-        );
+        )
+        .unwrap();
 
         builder.ensure(StdLink::from_std(
             self,
@@ -969,7 +971,8 @@ impl Step for Rustc {
             vec![],
             false,
             true, // Only ship rustc_driver.so and .rmeta files, not all intermediate .rlib files.
-        );
+        )
+        .unwrap();
 
         // When building `librustc_driver.so` (like `libLLVM.so`) on linux, it can contain
         // unexpected debuginfo from dependencies, for example from the C++ standard library used in
@@ -1381,7 +1384,7 @@ impl Step for CodegenBackend {
         let tmp_stamp = out_dir.join(".tmp.stamp");
 
         let _guard = builder.msg_build(compiler, format_args!("codegen backend {backend}"), target);
-        let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false, false);
+        let files = run_cargo(builder, cargo, vec![], &tmp_stamp, vec![], false, false).unwrap();
         if builder.config.dry_run() {
             return;
         }
@@ -1907,7 +1910,8 @@ pub fn run_cargo(
     additional_target_deps: Vec<(PathBuf, DependencyType)>,
     is_check: bool,
     rlib_only_metadata: bool,
-) -> Vec<PathBuf> {
+) -> Result<Vec<PathBuf>, String> {
+    let failure_behavior = cargo.bootstrap_command.failure_behavior;
     // `target_root_dir` looks like $dir/$target/release
     let target_root_dir = stamp.parent().unwrap();
     // `target_deps_dir` looks like $dir/$target/release/deps
@@ -2011,11 +2015,15 @@ pub fn run_cargo(
     });
 
     if !ok {
-        crate::exit!(1);
+        if failure_behavior == BehaviorOnFailure::Ignore {
+            return Ok(Vec::new());
+        }
+
+        return Err("Command failed.".to_owned());
     }
 
     if builder.config.dry_run() {
-        return Vec::new();
+        return Ok(Vec::new());
     }
 
     // Ok now we need to actually find all the files listed in `toplevel`. We've
@@ -2038,6 +2046,7 @@ pub fn run_cargo(
         });
         let path_to_add = match max {
             Some(triple) => triple.0.to_str().unwrap(),
+            None if failure_behavior == BehaviorOnFailure::Ignore => continue,
             None => panic!("no output generated for {prefix:?} {extension:?}"),
         };
         if is_dylib(path_to_add) {
@@ -2063,7 +2072,7 @@ pub fn run_cargo(
         new_contents.extend(b"\0");
     }
     t!(fs::write(stamp, &new_contents));
-    deps.into_iter().map(|(d, _)| d).collect()
+    Ok(deps.into_iter().map(|(d, _)| d).collect())
 }
 
 pub fn stream_cargo(

src/bootstrap/src/core/build_steps/tool.rs

@@ -9,7 +9,6 @@ use crate::core::builder;
 use crate::core::builder::{Builder, Cargo as CargoCommand, RunConfig, ShouldRun, Step};
 use crate::core::config::TargetSelection;
 use crate::utils::channel::GitInfo;
-use crate::utils::exec::BootstrapCommand;
 use crate::utils::helpers::{add_dylib_path, exe, t};
 use crate::Compiler;
 use crate::Mode;
@@ -97,9 +96,12 @@ impl Step for ToolBuild {
             self.source_type,
             &self.extra_features,
         );
+        cargo.bootstrap_command = cargo.bootstrap_command.allow_failure();
+
         if !self.allow_features.is_empty() {
             cargo.allow_features(self.allow_features);
         }
+
         let _guard = builder.msg_tool(
             Kind::Build,
             self.mode,
@@ -109,9 +111,20 @@ impl Step for ToolBuild {
             &self.target,
         );
 
-        let cargo = Command::from(cargo);
-        // we check this below
-        let build_success = builder.run_cmd(BootstrapCommand::from(cargo).allow_failure());
+        let stamp = builder
+            .cargo_out(compiler, Mode::ToolRustc, target)
+            .join(format!(".{}-check.stamp", self.tool));
+
+        let build_success = compile::run_cargo(
+            builder,
+            cargo,
+            builder.config.free_args.clone(),
+            &stamp,
+            vec![],
+            false,
+            false,
+        )
+        .is_ok();
 
         builder.save_toolstate(
             tool,

src/bootstrap/src/core/builder.rs

@@ -2383,7 +2383,7 @@ impl HostFlags {
 
 #[derive(Debug)]
 pub struct Cargo {
-    bootstrap_command: BootstrapCommand,
+    pub(crate) bootstrap_command: BootstrapCommand,
     compiler: Compiler,
     target: TargetSelection,
     rustflags: Rustflags,

src/bootstrap/src/utils/exec.rs

@@ -1,7 +1,7 @@
 use std::process::Command;
 
 /// What should be done when the command fails.
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Copy, Clone, PartialEq)]
 pub enum BehaviorOnFailure {
     /// Immediately stop bootstrap.
     Exit,