Auto merge of #112701 - bjorn3:test_cg_clif_in_ci2, r=Mark-Simulacrum

Run part of cg_clif's tests in CI

While currently cg_clif is already built in CI ensuring that it always compiles, sometimes there is a bug in the changes that were made causing tests to fail. This PR is one step towards preventing this.

Part of the test suite is still skipped until vendoring for the projects that are being tested is implemented. I will implement that in a future PR.

Fixes part of https://github.com/bjorn3/rustc_codegen_cranelift/issues/1290
Fixes part of https://github.com/rust-lang/rust/issues/95518
Required for https://github.com/rust-lang/rust/pull/81746

src/bootstrap/builder.rs

@@ -737,6 +737,7 @@ impl<'a> Builder<'a> {
                 test::Incremental,
                 test::Debuginfo,
                 test::UiFullDeps,
+                test::CodegenCranelift,
                 test::Rustdoc,
                 test::RunCoverageRustdoc,
                 test::Pretty,

src/bootstrap/test.rs

@@ -2967,3 +2967,129 @@ impl Step for TestHelpers {
             .compile("rust_test_helpers");
     }
 }
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct CodegenCranelift {
+    compiler: Compiler,
+    target: TargetSelection,
+}
+
+impl Step for CodegenCranelift {
+    type Output = ();
+    const DEFAULT: bool = true;
+    const ONLY_HOSTS: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        run.paths(&["compiler/rustc_codegen_cranelift"])
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        let builder = run.builder;
+        let host = run.build_triple();
+        let compiler = run.builder.compiler_for(run.builder.top_stage, host, host);
+
+        if builder.doc_tests == DocTests::Only {
+            return;
+        }
+
+        let triple = run.target.triple;
+        let target_supported = if triple.contains("linux") {
+            triple.contains("x86_64") || triple.contains("aarch64") || triple.contains("s390x")
+        } else if triple.contains("darwin") || triple.contains("windows") {
+            triple.contains("x86_64")
+        } else {
+            false
+        };
+        if !target_supported {
+            builder.info("target not supported by rustc_codegen_cranelift. skipping");
+            return;
+        }
+
+        if builder.remote_tested(run.target) {
+            builder.info("remote testing is not supported by rustc_codegen_cranelift. skipping");
+            return;
+        }
+
+        if !builder.config.rust_codegen_backends.contains(&INTERNER.intern_str("cranelift")) {
+            builder.info("cranelift not in rust.codegen-backends. skipping");
+            return;
+        }
+
+        builder.ensure(CodegenCranelift { compiler, target: run.target });
+    }
+
+    fn run(self, builder: &Builder<'_>) {
+        let compiler = self.compiler;
+        let target = self.target;
+
+        builder.ensure(compile::Std::new(compiler, target));
+
+        // If we're not doing a full bootstrap but we're testing a stage2
+        // version of libstd, then what we're actually testing is the libstd
+        // produced in stage1. Reflect that here by updating the compiler that
+        // we're working with automatically.
+        let compiler = builder.compiler_for(compiler.stage, compiler.host, target);
+
+        let build_cargo = || {
+            let mut cargo = builder.cargo(
+                compiler,
+                Mode::Codegen, // Must be codegen to ensure dlopen on compiled dylibs works
+                SourceType::InTree,
+                target,
+                "run",
+            );
+            cargo.current_dir(&builder.src.join("compiler/rustc_codegen_cranelift"));
+            cargo
+                .arg("--manifest-path")
+                .arg(builder.src.join("compiler/rustc_codegen_cranelift/build_system/Cargo.toml"));
+            compile::rustc_cargo_env(builder, &mut cargo, target, compiler.stage);
+
+            // Avoid incremental cache issues when changing rustc
+            cargo.env("CARGO_BUILD_INCREMENTAL", "false");
+
+            cargo
+        };
+
+        builder.info(&format!(
+            "{} cranelift stage{} ({} -> {})",
+            Kind::Test.description(),
+            compiler.stage,
+            &compiler.host,
+            target
+        ));
+        let _time = util::timeit(&builder);
+
+        // FIXME handle vendoring for source tarballs before removing the --skip-test below
+        let download_dir = builder.out.join("cg_clif_download");
+
+        /*
+        let mut prepare_cargo = build_cargo();
+        prepare_cargo.arg("--").arg("prepare").arg("--download-dir").arg(&download_dir);
+        #[allow(deprecated)]
+        builder.config.try_run(&mut prepare_cargo.into()).unwrap();
+        */
+
+        let mut cargo = build_cargo();
+        cargo
+            .arg("--")
+            .arg("test")
+            .arg("--download-dir")
+            .arg(&download_dir)
+            .arg("--out-dir")
+            .arg(builder.stage_out(compiler, Mode::ToolRustc).join("cg_clif"))
+            .arg("--no-unstable-features")
+            .arg("--use-backend")
+            .arg("cranelift")
+            // Avoid having to vendor the standard library dependencies
+            .arg("--sysroot")
+            .arg("llvm")
+            // These tests depend on crates that are not yet vendored
+            // FIXME remove once vendoring is handled
+            .arg("--skip-test")
+            .arg("testsuite.extended_sysroot");
+        cargo.args(builder.config.test_args());
+
+        #[allow(deprecated)]
+        builder.config.try_run(&mut cargo.into()).unwrap();
+    }
+}

src/ci/run.sh

@@ -123,6 +123,9 @@ else
 
   RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.verify-llvm-ir"
 
+  # Test the Cranelift backend in on CI, but don't ship it.
+  RUST_CONFIGURE_ARGS="$RUST_CONFIGURE_ARGS --set rust.codegen-backends=llvm,cranelift"
+
   # We enable this for non-dist builders, since those aren't trying to produce
   # fresh binaries. We currently don't entirely support distributing a fresh
   # copy of the compiler (including llvm tools, etc.) if we haven't actually