build rustc with 1CGU on x86_64-apple-darwin

Author: lqd

.github/workflows/ci.yml

@@ -303,7 +303,7 @@ jobs:
           - name: dist-x86_64-apple
             env:
               SCRIPT: "./x.py dist bootstrap --include-default-paths --host=x86_64-apple-darwin --target=x86_64-apple-darwin"
-              RUST_CONFIGURE_ARGS: "--enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false --set rust.lto=thin"
+              RUST_CONFIGURE_ARGS: "--enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false --set rust.lto=thin --set rust.codegen-units=1"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.7
               SELECT_XCODE: /Applications/Xcode_13.4.1.app

src/ci/github-actions/ci.yml

@@ -482,7 +482,7 @@ jobs:
           - name: dist-x86_64-apple
             env:
               SCRIPT: ./x.py dist bootstrap --include-default-paths --host=x86_64-apple-darwin --target=x86_64-apple-darwin
-              RUST_CONFIGURE_ARGS: --enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false --set rust.lto=thin
+              RUST_CONFIGURE_ARGS: --enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false --set rust.lto=thin --set rust.codegen-units=1
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.7
               SELECT_XCODE: /Applications/Xcode_13.4.1.app