Rollup merge of #78228 - pietroalbini:finally, r=Mark-Simulacrum

Promote aarch64-unknown-linux-gnu to Tier 1

This PR promotes the `aarch64-unknown-linux-gnu` target to Tier 1, as proposed by [RFC 2959]:

* The `aarch64-gnu` CI job is moved from `auto-fallible` to `auto`.
* The platform support documentation is updated, uplifting the target to Tiert 1 with a note about missing stack probes support.
* Building the documentation is enabled for the target, as we produce the `rust-docs` component for all Tier 1 platforms.

[RFC 2959]: https://github.com/rust-lang/rfcs/pull/2959

4 files changed, 12 insertions, 20 deletions

diff --git a/src/ci/docker/host-x86_64/dist-aarch64-linux/Dockerfile b/src/ci/docker/host-x86_64/dist-aarch64-linux/Dockerfile
index df65f9df441..95c54ca1abc 100644
--- a/src/ci/docker/host-x86_64/dist-aarch64-linux/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-aarch64-linux/Dockerfile
@@ -35,6 +35,5 @@ ENV HOSTS=aarch64-unknown-linux-gnu
 ENV RUST_CONFIGURE_ARGS \
       --enable-full-tools \
       --enable-profiler \
-      --enable-sanitizers \
-      --disable-docs
+      --enable-sanitizers
 ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS
diff --git a/src/ci/github-actions/ci.yml b/src/ci/github-actions/ci.yml
index 4cbb7b62cd6..889c98966eb 100644
--- a/src/ci/github-actions/ci.yml
+++ b/src/ci/github-actions/ci.yml
@@ -301,6 +301,9 @@ jobs:
           #   Linux/Docker builders   #
           #############################
 
+          - name: aarch64-gnu
+            <<: *job-aarch64-linux
+
           - name: arm-android
             <<: *job-linux-xl
 
@@ -635,23 +638,6 @@ jobs:
               SCRIPT: python x.py dist
             <<: *job-windows-xl
 
-  auto-fallible:
-    <<: *base-ci-job
-    name: auto-fallible
-    env:
-      <<: [*shared-ci-variables, *dummy-variables]
-    if: github.event_name == 'push' && github.ref == 'refs/heads/auto' && github.repository == 'rust-lang-ci/rust'
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          #############################
-          #   Linux/Docker builders   #
-          #############################
-
-          - name: aarch64-gnu
-            <<: *job-aarch64-linux
-
   try:
     <<: *base-ci-job
     name: try
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index 85c6f91f085..8005a5f3563 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -34,6 +34,7 @@ Specifically they will each satisfy the following requirements:
 
 target | std | host | notes
 -------|-----|------|-------
+`aarch64-unknown-linux-gnu` | ✓ | ✓ | ARM64 Linux (kernel 4.2, glibc 2.17+) [^missing-stack-probes]
 `i686-pc-windows-gnu` | ✓ | ✓ | 32-bit MinGW (Windows 7+)
 `i686-pc-windows-msvc` | ✓ | ✓ | 32-bit MSVC (Windows 7+)
 `i686-unknown-linux-gnu` | ✓ | ✓ | 32-bit Linux (kernel 2.6.32+, glibc 2.11+)
@@ -42,6 +43,12 @@ target | std | host | notes
 `x86_64-pc-windows-msvc` | ✓ | ✓ | 64-bit MSVC (Windows 7+)
 `x86_64-unknown-linux-gnu` | ✓ | ✓ | 64-bit Linux (kernel 2.6.32+, glibc 2.11+)
 
+[^missing-stack-probes]: Stack probes support is missing on
+  `aarch64-unknown-linux-gnu`, but it's planned to be implemented in the near
+  future. The implementation is tracked on [issue #77071][77071].
+
+[77071]: https://github.com/rust-lang/rust/issues/77071
+
 ## Tier 2
 
 Tier 2 platforms can be thought of as "guaranteed to build". Automated tests
@@ -62,7 +69,6 @@ target | std | host | notes
 `aarch64-fuchsia` | ✓ |  | ARM64 Fuchsia
 `aarch64-linux-android` | ✓ |  | ARM64 Android
 `aarch64-pc-windows-msvc` | ✓ | ✓ | ARM64 Windows MSVC
-`aarch64-unknown-linux-gnu` | ✓ | ✓ | ARM64 Linux (kernel 4.2, glibc 2.17)
 `aarch64-unknown-linux-musl` | ✓ | ✓ | ARM64 Linux with MUSL
 `aarch64-unknown-none` | * |  | Bare ARM64, hardfloat
 `aarch64-unknown-none-softfloat` | * |  | Bare ARM64, softfloat
diff --git a/src/tools/build-manifest/src/main.rs b/src/tools/build-manifest/src/main.rs
index 9a8f2404e4a..687354dc6ae 100644
--- a/src/tools/build-manifest/src/main.rs
+++ b/src/tools/build-manifest/src/main.rs
@@ -155,6 +155,7 @@ static TARGETS: &[&str] = &[
 ];
 
 static DOCS_TARGETS: &[&str] = &[
+    "aarch64-unknown-linux-gnu",
     "i686-apple-darwin",
     "i686-pc-windows-gnu",
     "i686-pc-windows-msvc",