Move enabling the cranelift backend to ci/run.sh

Author: bjorn3

config.example.toml

@@ -618,7 +618,7 @@ changelog-seen = 2
 # and currently the only standard options supported are `"llvm"`, `"cranelift"`
 # and `"gcc"`. The first backend in this list will be used as default by rustc
 # when no explicit backend is specified.
-#codegen-backends = ["llvm", "cranelift"]
+#codegen-backends = ["llvm"]
 
 # Indicates whether LLD will be compiled and made available in the sysroot for
 # rustc to execute.

src/bootstrap/config.rs

@@ -1065,8 +1065,7 @@ impl Config {
         config.channel = "dev".to_string();
         config.codegen_tests = true;
         config.rust_dist_src = true;
-        config.rust_codegen_backends =
-            vec![INTERNER.intern_str("llvm"), INTERNER.intern_str("cranelift")];
+        config.rust_codegen_backends = vec![INTERNER.intern_str("llvm")];
         config.deny_warnings = true;
         config.bindir = "bin".into();
         config.dist_include_mingw_linker = true;

src/bootstrap/defaults/config.dist.toml

@@ -16,8 +16,6 @@ download-ci-llvm = false
 # Make sure they don't get set when installing from source.
 channel = "nightly"
 download-rustc = false
-# Skip building the cranelift backend. It isn't ready to be shipped yet.
-codegen-backends = ["llvm"]
 
 [dist]
 # Use better compression when preparing tarballs.

src/bootstrap/dist.rs

@@ -445,6 +445,19 @@ impl Step for Rustc {
                 }
             }
 
+            // Copy over the codegen backends
+            let backends_src = builder.sysroot_codegen_backends(compiler);
+            let backends_rel = backends_src
+                .strip_prefix(&src)
+                .unwrap()
+                .strip_prefix(builder.sysroot_libdir_relative(compiler))
+                .unwrap();
+            // Don't use custom libdir here because ^lib/ will be resolved again with installer
+            let backends_dst = image.join("lib").join(&backends_rel);
+
+            t!(fs::create_dir_all(&backends_dst));
+            builder.cp_r(&backends_src, &backends_dst);
+
             // Copy libLLVM.so to the lib dir as well, if needed. While not
             // technically needed by rustc itself it's needed by lots of other
             // components like the llvm tools and LLD. LLD is included below and

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