Add --compile-time-deps argument for x check

compiler/rustc/Cargo.toml

@@ -27,6 +27,7 @@ features = ['unprefixed_malloc_on_supported_platforms']
 
 [features]
 # tidy-alphabetical-start
+check_only = ['rustc_driver_impl/check_only']
 jemalloc = ['dep:tikv-jemalloc-sys']
 llvm = ['rustc_driver_impl/llvm']
 max_level_info = ['rustc_driver_impl/max_level_info']

compiler/rustc_codegen_llvm/Cargo.toml

@@ -43,3 +43,6 @@ serde_json = "1"
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 tracing = "0.1"
 # tidy-alphabetical-end
+
+[features]
+check_only = ["rustc_llvm/check_only"]

compiler/rustc_driver_impl/Cargo.toml

@@ -72,6 +72,7 @@ ctrlc = "3.4.4"
 
 [features]
 # tidy-alphabetical-start
+check_only = ['rustc_interface/check_only']
 llvm = ['rustc_interface/llvm']
 max_level_info = ['rustc_log/max_level_info']
 rustc_randomized_layouts = [

compiler/rustc_interface/Cargo.toml

@@ -56,5 +56,6 @@ rustc_abi = { path = "../rustc_abi" }
 
 [features]
 # tidy-alphabetical-start
+check_only = ['rustc_codegen_llvm?/check_only']
 llvm = ['dep:rustc_codegen_llvm']
 # tidy-alphabetical-end

compiler/rustc_llvm/Cargo.toml

@@ -14,3 +14,7 @@ libc = "0.2.73"
 # pinned `cc` in `rustc_codegen_ssa` if you update `cc` here.
 cc = "=1.2.16"
 # tidy-alphabetical-end
+
+[features]
+# Used by ./x.py check --compile-time-deps to skip building C++ code
+check_only = []

compiler/rustc_llvm/build.rs

@@ -106,6 +106,10 @@ fn output(cmd: &mut Command) -> String {
 }
 
 fn main() {
+    if cfg!(feature = "check_only") {
+        return;
+    }
+
     for component in REQUIRED_COMPONENTS.iter().chain(OPTIONAL_COMPONENTS.iter()) {
         println!("cargo:rustc-check-cfg=cfg(llvm_component,values(\"{component}\"))");
     }

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

@@ -54,6 +54,11 @@ impl Step for Std {
             return;
         }
 
+        if run.builder.config.compile_time_deps {
+            // libstd doesn't have any important build scripts and can't have any proc macros
+            return;
+        }
+
         let crates = std_crates_for_run_make(&run);
         run.builder.ensure(Std {
             build_compiler: prepare_compiler_for_check(run.builder, run.target, Mode::Std),
@@ -250,6 +255,13 @@ fn prepare_compiler_for_check(
     match mode {
         Mode::ToolBootstrap => builder.compiler(0, host),
         Mode::ToolStd => {
+            if builder.config.compile_time_deps {
+                // When --compile-time-deps is passed, we can't use any rustc
+                // other than the bootstrap compiler. Luckily build scripts and
+                // proc macros for tools are unlikely to need nightly.
+                return builder.compiler(0, host);
+            }
+
             // These tools require the local standard library to be checked
             let build_compiler = builder.compiler(builder.top_stage, host);
 

src/bootstrap/src/core/build_steps/setup.rs

@@ -586,12 +586,14 @@ Select which editor you would like to set up [default: None]: ";
                 "b5dd299b93dca3ceeb9b335f929293cb3d4bf4977866fbe7ceeac2a8a9f99088",
                 "631c837b0e98ae35fd48b0e5f743b1ca60adadf2d0a2b23566ba25df372cf1a9",
                 "080955765db84bb6cbf178879f489c4e2369397626a6ecb3debedb94a9d0b3ce",
+                "f501475c6654187091c924ae26187fa5791d74d4a8ab3fb61fbbe4c0275aade1",
             ],
             EditorKind::Helix => &[
                 "2d3069b8cf1b977e5d4023965eb6199597755e6c96c185ed5f2854f98b83d233",
                 "6736d61409fbebba0933afd2e4c44ff2f97c1cb36cf0299a7f4a7819b8775040",
                 "f252dcc30ca85a193a699581e5e929d5bd6c19d40d7a7ade5e257a9517a124a5",
                 "198c195ed0c070d15907b279b8b4ea96198ca71b939f5376454f3d636ab54da5",
+                "1c43ead340b20792b91d02b08494ee68708e7e09f56b6766629b4b72079208f1",
             ],
             EditorKind::Vim | EditorKind::VsCode => &[
                 "ea67e259dedf60d4429b6c349a564ffcd1563cf41c920a856d1f5b16b4701ac8",
@@ -607,12 +609,14 @@ Select which editor you would like to set up [default: None]: ";
                 "e53e9129ca5ee5dcbd6ec8b68c2d87376474eb154992deba3c6d9ab1703e0717",
                 "f954316090936c7e590c253ca9d524008375882fa13c5b41d7e2547a896ff893",
                 "701b73751efd7abd6487f2c79348dab698af7ac4427b79fa3d2087c867144b12",
+                "a61df796c0c007cb6512127330564e49e57d558dec715703916a928b072a1054",
             ],
             EditorKind::Zed => &[
                 "bbce727c269d1bd0c98afef4d612eb4ce27aea3c3a8968c5f10b31affbc40b6c",
                 "a5380cf5dd9328731aecc5dfb240d16dac46ed272126b9728006151ef42f5909",
                 "2e96bf0d443852b12f016c8fc9840ab3d0a2b4fe0b0fb3a157e8d74d5e7e0e26",
                 "4fadd4c87389a601a27db0d3d74a142fa3a2e656ae78982e934dbe24bee32ad6",
+                "f0bb3d23ab1a49175ab0ef5c4071af95bb03d01d460776cdb716d91333443382",
             ],
         }
     }

src/bootstrap/src/core/builder/cargo.rs

@@ -747,6 +747,12 @@ impl Builder<'_> {
         // Make cargo emit diagnostics relative to the rustc src dir.
         cargo.arg(format!("-Zroot-dir={}", self.src.display()));
 
+        if self.config.compile_time_deps {
+            // Build only build scripts and proc-macros for rust-analyzer when requested.
+            cargo.arg("-Zunstable-options");
+            cargo.arg("--compile-time-deps");
+        }
+
         // FIXME: Temporary fix for https://github.com/rust-lang/cargo/issues/3005
         // Force cargo to output binaries with disambiguating hashes in the name
         let mut metadata = if compiler.stage == 0 {

src/bootstrap/src/core/config/config.rs

@@ -110,6 +110,7 @@ pub struct Config {
     pub include_default_paths: bool,
     pub rustc_error_format: Option<String>,
     pub json_output: bool,
+    pub compile_time_deps: bool,
     pub test_compare_mode: bool,
     pub color: Color,
     pub patch_binaries_for_nix: Option<bool>,
@@ -421,6 +422,7 @@ impl Config {
             jobs: flags_jobs,
             warnings: flags_warnings,
             json_output: flags_json_output,
+            compile_time_deps: flags_compile_time_deps,
             color: flags_color,
             bypass_bootstrap_lock: flags_bypass_bootstrap_lock,
             rust_profile_generate: flags_rust_profile_generate,
@@ -468,6 +470,7 @@ impl Config {
         config.include_default_paths = flags_include_default_paths;
         config.rustc_error_format = flags_rustc_error_format;
         config.json_output = flags_json_output;
+        config.compile_time_deps = flags_compile_time_deps;
         config.on_fail = flags_on_fail;
         config.cmd = flags_cmd;
         config.incremental = flags_incremental;
@@ -1064,6 +1067,13 @@ impl Config {
             _ => {}
         }
 
+        if config.compile_time_deps && !matches!(config.cmd, Subcommand::Check { .. }) {
+            eprintln!(
+                "WARNING: Can't use --compile-time-deps with any subcommand other than check."
+            );
+            exit!(1);
+        }
+
         // CI should always run stage 2 builds, unless it specifically states otherwise
         #[cfg(not(test))]
         if flags_stage.is_none() && config.is_running_on_ci {

src/bootstrap/src/core/config/flags.rs

@@ -132,6 +132,9 @@ pub struct Flags {
     #[arg(global = true, long)]
     /// use message-format=json
     pub json_output: bool,
+    #[arg(global = true, long)]
+    /// only build proc-macros and build scripts (for rust-analyzer)
+    pub compile_time_deps: bool,
 
     #[arg(global = true, long, value_name = "STYLE")]
     #[arg(value_enum, default_value_t = Color::Auto)]

src/bootstrap/src/lib.rs

@@ -775,6 +775,9 @@ impl Build {
         if self.config.rust_randomize_layout && check("rustc_randomized_layouts") {
             features.push("rustc_randomized_layouts");
         }
+        if self.config.compile_time_deps && kind == Kind::Check {
+            features.push("check_only");
+        }
 
         // If debug logging is on, then we want the default for tracing:
         // https://github.com/tokio-rs/tracing/blob/3dd5c03d907afdf2c39444a29931833335171554/tracing/src/level_filters.rs#L26

src/bootstrap/src/utils/change_tracker.rs

@@ -466,4 +466,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Info,
         summary: "The --extra-checks flag now supports prefixing any check with `auto:` to only run it if relevant files are modified",
     },
+    ChangeInfo {
+        change_id: 143785,
+        severity: ChangeSeverity::Info,
+        summary: "A --compile-time-deps flag has been added to reduce the time it takes rust-analyzer to start",
+    },
 ];