Auto merge of #153726 - Kobzol:parallel-frontend-tests-optional, r=<try>

Add optional CI job to run tests with the parallel frontend


try-job: x86_64-gnu-parallel-frontend

Author: bors

src/ci/citool/src/jobs.rs

@@ -200,16 +200,6 @@ fn validate_job_database(db: &JobDatabase) -> anyhow::Result<()> {
         equivalent_modulo_carve_out(pr_job, auto_job)?;
     }
 
-    // Auto CI jobs must all "fail-fast" to avoid wasting Auto CI resources. For instance, `tidy`.
-    for auto_job in &db.auto_jobs {
-        if auto_job.continue_on_error == Some(true) {
-            return Err(anyhow!(
-                "Auto job `{}` cannot have `continue_on_error: true`",
-                auto_job.name
-            ));
-        }
-    }
-
     Ok(())
 }
 

src/ci/docker/host-x86_64/x86_64-gnu-parallel-frontend/Dockerfile

@@ -0,0 +1,35 @@
+FROM ubuntu:22.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  g++ \
+  make \
+  ninja-build \
+  file \
+  curl \
+  ca-certificates \
+  python3 \
+  git \
+  cmake \
+  sudo \
+  gdb \
+  libssl-dev \
+  pkg-config \
+  xz-utils \
+  mingw-w64 \
+  zlib1g-dev \
+  libzstd-dev \
+  && rm -rf /var/lib/apt/lists/*
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+ENV RUST_CONFIGURE_ARGS \
+ --build=x86_64-unknown-linux-gnu \
+ --enable-sanitizers \
+ --enable-profiler \
+ --enable-compiler-docs \
+ --set llvm.libzstd=true
+
+# Run the test suite with 2 parallel frontend threads
+ENV SCRIPT python3 ../x.py --stage 2 test --set rust.parallel-frontend-threads=2

src/ci/github-actions/jobs.yml

@@ -348,6 +348,11 @@ auto:
   - name: x86_64-gnu
     <<: *job-linux-4c
 
+  - name: x86_64-gnu-parallel-frontend
+    # This test can be flaky, so do not cancel CI if it fails, for now.
+    continue_on_error: true
+    <<: *job-linux-4c
+
   - name: x86_64-gnu-gcc
     doc_url: https://rustc-dev-guide.rust-lang.org/tests/codegen-backend-tests/cg_gcc.html
     <<: *job-linux-4c