Auto merge of rust-lang#14995 - Veykril:proc-macro-slow-test, r=lnicola

fix: Fix proc-macro slow test

.github/workflows/ci.yaml

@@ -63,7 +63,8 @@ jobs:
  - name: Install Rust toolchain
  run: |
  rustup update --no-self-update ${{ env.RUST_CHANNEL }}
- rustup component add rustfmt rust-src
+ rustup component add --toolchain ${{ env.RUST_CHANNEL }} rustfmt rust-src
+ rustup default ${{ env.RUST_CHANNEL }}
 
  - name: Cache Dependencies
  uses: Swatinem/rust-cache@988c164c3d0e93c4dbab36aaf5bbeb77425b2894

crates/rust-analyzer/tests/slow-tests/main.rs

@@ -839,6 +839,17 @@ fn resolve_proc_macro() {
  return;
  }
 
+ // skip using the sysroot config as to prevent us from loading the sysroot sources
+ let mut rustc = std::process::Command::new(toolchain::rustc());
+ rustc.args(["--print", "sysroot"]);
+ let output = rustc.output().unwrap();
+ let sysroot =
+ vfs::AbsPathBuf::try_from(std::str::from_utf8(&output.stdout).unwrap().trim()).unwrap();
+
+ let standalone_server_name =
+ format!("rust-analyzer-proc-macro-srv{}", std::env::consts::EXE_SUFFIX);
+ let proc_macro_server_path = sysroot.join("libexec").join(&standalone_server_name);
+
  let server = Project::with_fixture(
  r###"
 //- /foo/Cargo.toml
@@ -916,7 +927,7 @@ pub fn foo(_input: TokenStream) -> TokenStream {
  },
  "procMacro": {
  "enable": true,
- "server": PathBuf::from(env!("CARGO_BIN_EXE_rust-analyzer")),
+ "server": proc_macro_server_path.as_path().as_ref(),
  }
  }))
  .root("foo")