Auto merge of #104650 - BlackHoleFox:stuck-with-xcode-13, r=Mark-Simulacrum

Build macOS distribution artifacts with XCode 13

After all of the `rust-lang/rust` Apple runners started using macOS 12, the builds created by CI began to use XCode 14.0.1. Due to this (as far as we can tell), XCode's build tools started to ignore the `MACOSX_DEPLOYMENT_TARGET` being defined by us for the distributed builds that let both `rustc` and `libstd` work on older versions. The current idea is that since XCode 14's macOS SDK doesn't support deployment targets before 10.13, it uses some default of its own. You can see the difference between stable's and the most recent nighty's supported versions [here](https://github.com/rust-lang/rust/issues/104570#issuecomment-1321225907).

I wasn't able to confirm my SDK versioning hypothesis locally since I think there's something jammed with my XCode installation, but hopefully this should still fix it for releases.

Closes https://github.com/rust-lang/rust/issues/104570

r? `@Mark-Simulacrum`

3 files changed, 34 insertions, 0 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 771cef6e4d0..ebbed11d04b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -96,6 +96,9 @@ jobs:
       - name: install sccache
         run: src/ci/scripts/install-sccache.sh
         if: success() && !env.SKIP_JOB
+      - name: select Xcode
+        run: src/ci/scripts/select-xcode.sh
+        if: success() && !env.SKIP_JOB
       - name: install clang
         run: src/ci/scripts/install-clang.sh
         if: success() && !env.SKIP_JOB
@@ -301,6 +304,7 @@ jobs:
               RUST_CONFIGURE_ARGS: "--enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.7
+              SELECT_XCODE: /Applications/Xcode_13.4.1.app
               NO_LLVM_ASSERTIONS: 1
               NO_DEBUG_ASSERTIONS: 1
               NO_OVERFLOW_CHECKS: 1
@@ -312,6 +316,7 @@ jobs:
               RUST_CONFIGURE_ARGS: "--enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.7
+              SELECT_XCODE: /Applications/Xcode_13.4.1.app
               NO_LLVM_ASSERTIONS: 1
               NO_DEBUG_ASSERTIONS: 1
               NO_OVERFLOW_CHECKS: 1
@@ -322,6 +327,7 @@ jobs:
               RUST_CONFIGURE_ARGS: "--enable-extended --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.7
+              SELECT_XCODE: /Applications/Xcode_13.4.1.app
               NO_LLVM_ASSERTIONS: 1
               NO_DEBUG_ASSERTIONS: 1
               NO_OVERFLOW_CHECKS: 1
@@ -353,6 +359,7 @@ jobs:
               SCRIPT: "./x.py dist bootstrap --include-default-paths --stage 2"
               RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --host=aarch64-apple-darwin --target=aarch64-apple-darwin --enable-full-tools --enable-sanitizers --enable-profiler --disable-docs --set rust.jemalloc --set llvm.ninja=false"
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
+              SELECT_XCODE: /Applications/Xcode_13.4.1.app
               USE_XCODE_CLANG: 1
               MACOSX_DEPLOYMENT_TARGET: 11.0
               MACOSX_STD_DEPLOYMENT_TARGET: 11.0
@@ -503,6 +510,9 @@ jobs:
       - name: install sccache
         run: src/ci/scripts/install-sccache.sh
         if: success() && !env.SKIP_JOB
+      - name: select Xcode
+        run: src/ci/scripts/select-xcode.sh
+        if: success() && !env.SKIP_JOB
       - name: install clang
         run: src/ci/scripts/install-clang.sh
         if: success() && !env.SKIP_JOB
@@ -615,6 +625,9 @@ jobs:
       - name: install sccache
         run: src/ci/scripts/install-sccache.sh
         if: success() && !env.SKIP_JOB
+      - name: select Xcode
+        run: src/ci/scripts/select-xcode.sh
+        if: success() && !env.SKIP_JOB
       - name: install clang
         run: src/ci/scripts/install-clang.sh
         if: success() && !env.SKIP_JOB
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index 9f401779900..10de2e8d5ea 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -153,6 +153,10 @@ x--expand-yaml-anchors--remove:
         run: src/ci/scripts/install-sccache.sh
         <<: *step
 
+      - name: select Xcode
+        run: src/ci/scripts/select-xcode.sh
+        <<: *step
+
       - name: install clang
         run: src/ci/scripts/install-clang.sh
         <<: *step
@@ -466,6 +470,7 @@ jobs:
               RUST_CONFIGURE_ARGS: --enable-full-tools --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.7
+              SELECT_XCODE: /Applications/Xcode_13.4.1.app
               NO_LLVM_ASSERTIONS: 1
               NO_DEBUG_ASSERTIONS: 1
               NO_OVERFLOW_CHECKS: 1
@@ -478,6 +483,7 @@ jobs:
               RUST_CONFIGURE_ARGS: --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.7
+              SELECT_XCODE: /Applications/Xcode_13.4.1.app
               NO_LLVM_ASSERTIONS: 1
               NO_DEBUG_ASSERTIONS: 1
               NO_OVERFLOW_CHECKS: 1
@@ -489,6 +495,7 @@ jobs:
               RUST_CONFIGURE_ARGS: --enable-extended --enable-profiler --set rust.jemalloc --set llvm.ninja=false
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
               MACOSX_DEPLOYMENT_TARGET: 10.7
+              SELECT_XCODE: /Applications/Xcode_13.4.1.app
               NO_LLVM_ASSERTIONS: 1
               NO_DEBUG_ASSERTIONS: 1
               NO_OVERFLOW_CHECKS: 1
@@ -527,6 +534,7 @@ jobs:
                 --set rust.jemalloc
                 --set llvm.ninja=false
               RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
+              SELECT_XCODE: /Applications/Xcode_13.4.1.app
               USE_XCODE_CLANG: 1
               MACOSX_DEPLOYMENT_TARGET: 11.0
               MACOSX_STD_DEPLOYMENT_TARGET: 11.0
diff --git a/src/ci/scripts/select-xcode.sh b/src/ci/scripts/select-xcode.sh
new file mode 100755
index 00000000000..3b9c77d42ba
--- /dev/null
+++ b/src/ci/scripts/select-xcode.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+# This script selects the Xcode instance to use.
+
+set -euo pipefail
+IFS=$'\n\t'
+
+source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
+
+if isMacOS; then
+    if [[ -s "${SELECT_XCODE-}" ]]; then
+        sudo xcode-select -s "${SELECT_XCODE}"
+    fi
+fi