Rollup merge of #108865 - Zoxc:library-dummy-crate, r=jyn514

Add a `sysroot` crate to represent the standard library crates

This adds a dummy crate named `sysroot` to represent the standard library target instead of using the `test` crate. This allows the removal of `proc_macro` as a dependency of `test` allowing these 2 crates to build in parallel saving around 9 seconds locally.

Cargo.lock

@@ -4739,6 +4739,15 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "sysroot"
+version = "0.0.0"
+dependencies = [
+ "proc_macro",
+ "std",
+ "test",
+]
+
 [[package]]
 name = "tar"
 version = "0.4.38"
@@ -4823,7 +4832,6 @@ dependencies = [
  "getopts",
  "panic_abort",
  "panic_unwind",
- "proc_macro",
  "std",
 ]
 

Cargo.toml

@@ -2,7 +2,7 @@
 members = [
   "compiler/rustc",
   "library/std",
-  "library/test",
+  "library/sysroot",
   "src/rustdoc-json-types",
   "src/tools/build_helper",
   "src/tools/cargotest",

library/sysroot/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "sysroot"
+version = "0.0.0"
+edition = "2021"
+
+# this is a dummy crate to ensure that all required crates appear in the sysroot
+[dependencies]
+proc_macro = { path = "../proc_macro" }
+std = { path = "../std" }
+test = { path = "../test" }
+
+# Forward features to the `std` crate as necessary
+[features]
+default = ["std_detect_file_io", "std_detect_dlsym_getauxval", "panic-unwind"]
+backtrace = ["std/backtrace"]
+compiler-builtins-c = ["std/compiler-builtins-c"]
+compiler-builtins-mem = ["std/compiler-builtins-mem"]
+compiler-builtins-no-asm = ["std/compiler-builtins-no-asm"]
+compiler-builtins-mangled-names = ["std/compiler-builtins-mangled-names"]
+llvm-libunwind = ["std/llvm-libunwind"]
+system-llvm-libunwind = ["std/system-llvm-libunwind"]
+panic-unwind = ["std/panic_unwind"]
+panic_immediate_abort = ["std/panic_immediate_abort"]
+profiler = ["std/profiler"]
+std_detect_file_io = ["std/std_detect_file_io"]
+std_detect_dlsym_getauxval = ["std/std_detect_dlsym_getauxval"]
+std_detect_env_override = ["std/std_detect_env_override"]

library/sysroot/src/lib.rs

@@ -0,0 +1 @@
+// This is intentionally empty since this crate is only used to depend on other library crates.

library/test/Cargo.toml

@@ -12,23 +12,3 @@ std = { path = "../std" }
 core = { path = "../core" }
 panic_unwind = { path = "../panic_unwind" }
 panic_abort = { path = "../panic_abort" }
-
-# not actually used but needed to always have proc_macro in the sysroot
-proc_macro = { path = "../proc_macro" }
-
-# Forward features to the `std` crate as necessary
-[features]
-default = ["std_detect_file_io", "std_detect_dlsym_getauxval", "panic-unwind"]
-backtrace = ["std/backtrace"]
-compiler-builtins-c = ["std/compiler-builtins-c"]
-compiler-builtins-mem = ["std/compiler-builtins-mem"]
-compiler-builtins-no-asm = ["std/compiler-builtins-no-asm"]
-compiler-builtins-mangled-names = ["std/compiler-builtins-mangled-names"]
-llvm-libunwind = ["std/llvm-libunwind"]
-system-llvm-libunwind = ["std/system-llvm-libunwind"]
-panic-unwind = ["std/panic_unwind"]
-panic_immediate_abort = ["std/panic_immediate_abort"]
-profiler = ["std/profiler"]
-std_detect_file_io = ["std/std_detect_file_io"]
-std_detect_dlsym_getauxval = ["std/std_detect_dlsym_getauxval"]
-std_detect_env_override = ["std/std_detect_env_override"]

src/bootstrap/check.rs

@@ -79,7 +79,7 @@ impl Step for Std {
     const DEFAULT: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.all_krates("test").path("library")
+        run.all_krates("sysroot").path("library")
     }
 
     fn make_run(run: RunConfig<'_>) {

src/bootstrap/clean.rs

@@ -81,7 +81,7 @@ macro_rules! clean_crate_tree {
 
 clean_crate_tree! {
     Rustc, Mode::Rustc, "rustc-main";
-    Std, Mode::Std, "test";
+    Std, Mode::Std, "sysroot";
 }
 
 fn clean_default(build: &Build, all: bool) {

src/bootstrap/compile.rs

@@ -56,7 +56,7 @@ impl Step for Std {
         // When downloading stage1, the standard library has already been copied to the sysroot, so
         // there's no need to rebuild it.
         let builder = run.builder;
-        run.crate_or_deps("test")
+        run.crate_or_deps("sysroot")
             .path("library")
             .lazy_default_condition(Box::new(|| !builder.download_rustc()))
     }
@@ -364,7 +364,7 @@ pub fn std_cargo(builder: &Builder<'_>, target: TargetSelection, stage: u32, car
             .arg("--features")
             .arg(features)
             .arg("--manifest-path")
-            .arg(builder.src.join("library/test/Cargo.toml"));
+            .arg(builder.src.join("library/sysroot/Cargo.toml"));
 
         // Help the libc crate compile by assisting it in finding various
         // sysroot native libraries.

src/bootstrap/doc.rs

@@ -438,7 +438,7 @@ impl Step for Std {
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
         let builder = run.builder;
-        run.all_krates("test").path("library").default_condition(builder.config.docs)
+        run.all_krates("sysroot").path("library").default_condition(builder.config.docs)
     }
 
     fn make_run(run: RunConfig<'_>) {

src/bootstrap/test.rs

@@ -2145,7 +2145,7 @@ impl Step for Crate {
     const DEFAULT: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
-        run.crate_or_deps("test")
+        run.crate_or_deps("sysroot")
     }
 
     fn make_run(run: RunConfig<'_>) {