Demote i686-pc-windows-gnu to Tier 2

In accordance with RFC 3771.

I also added a stub doc page for the target and renamed the
windows-gnullvm page for consistency.

Author: Noratrieb

compiler/rustc_target/src/spec/targets/i686_pc_windows_gnu.rs

@@ -20,7 +20,7 @@ pub(crate) fn target() -> Target {
         llvm_target: "i686-pc-windows-gnu".into(),
         metadata: TargetMetadata {
             description: Some("32-bit MinGW (Windows 10+)".into()),
-            tier: Some(1),
+            tier: Some(2),
             host_tools: Some(true),
             std: Some(true),
         },

src/bootstrap/mk/Makefile.in

@@ -115,13 +115,7 @@ ci-msvc: ci-msvc-py ci-msvc-ps1
 
 ## MingW native builders
 
-# Set of tests that should represent half of the time of the test suite.
-# Used to split tests across multiple CI runners.
 # Test both x and bootstrap entrypoints.
-ci-mingw-x-1:
-	$(Q)$(CFG_SRC_DIR)/x test --stage 2 $(SKIP_COMPILER) $(TEST_SET2)
-ci-mingw-x-2:
-	$(Q)$(CFG_SRC_DIR)/x test --stage 2 $(SKIP_SRC) $(TEST_SET2)
 ci-mingw-x:
 	$(Q)$(CFG_SRC_DIR)/x test --stage 2 $(TEST_SET1)
 ci-mingw-bootstrap:

src/ci/docker/host-x86_64/mingw-check/Dockerfile

@@ -49,7 +49,7 @@ ENV RUN_CHECK_WITH_PARALLEL_QUERIES 1
 ENV SCRIPT \
            python3 ../x.py check --stage 0 --set build.optimized-compiler-builtins=false core alloc std --target=aarch64-unknown-linux-gnu,i686-pc-windows-msvc,i686-unknown-linux-gnu,x86_64-apple-darwin,x86_64-pc-windows-gnu,x86_64-pc-windows-msvc && \
            /scripts/check-default-config-profiles.sh && \
-           python3 ../x.py check --target=i686-pc-windows-gnu --host=i686-pc-windows-gnu && \
+           python3 ../x.py check --target=x86_64-pc-windows-gnu --host=x86_64-pc-windows-gnu && \
            python3 ../x.py clippy ci && \
            python3 ../x.py build --stage 0 src/tools/build-manifest && \
            python3 ../x.py test --stage 0 src/tools/compiletest && \

src/ci/docker/host-x86_64/x86_64-gnu-tools/checktools.sh

@@ -62,7 +62,6 @@ case $HOST_TARGET in
     # See <https://github.com/rust-lang/rust/issues/127883>
     # For now, these tests are moved to `x86_64-msvc-ext2` in `src/ci/github-actions/jobs.yml`.
     #python3 "$X_PY" test --stage 2 src/tools/miri --target aarch64-apple-darwin --test-args pass
-    #python3 "$X_PY" test --stage 2 src/tools/miri --target i686-pc-windows-gnu --test-args pass
     ;;
   *)
     echo "FATAL: unexpected host $HOST_TARGET"

src/ci/github-actions/jobs.yml

@@ -496,7 +496,7 @@ auto:
     env:
       SCRIPT: >
         python x.py test --stage 2 src/tools/miri --target aarch64-apple-darwin --test-args pass &&
-        python x.py test --stage 2 src/tools/miri --target i686-pc-windows-gnu --test-args pass &&
+        python x.py test --stage 2 src/tools/miri --target x86_64-pc-windows-gnu --test-args pass &&
         python x.py miri --stage 2 library/core --test-args notest &&
         python x.py miri --stage 2 library/alloc --test-args notest &&
         python x.py miri --stage 2 library/std --test-args notest
@@ -528,31 +528,6 @@ auto:
   # came from the mingw-w64 SourceForge download site. Unfortunately
   # SourceForge is notoriously flaky, so we mirror it on our own infrastructure.
 
-  # i686-mingw is split into three jobs to run tests in parallel.
-  - name: i686-mingw-1
-    env:
-      RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu
-      SCRIPT: make ci-mingw-x-1
-      # There is no dist-i686-mingw-alt, so there is no prebuilt LLVM with assertions
-      NO_DOWNLOAD_CI_LLVM: 1
-    <<: *job-windows-25
-
-  - name: i686-mingw-2
-    env:
-      RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu
-      SCRIPT: make ci-mingw-x-2
-      # There is no dist-i686-mingw-alt, so there is no prebuilt LLVM with assertions
-      NO_DOWNLOAD_CI_LLVM: 1
-    <<: *job-windows-25
-
-  - name: i686-mingw-3
-    env:
-      RUST_CONFIGURE_ARGS: --build=i686-pc-windows-gnu
-      SCRIPT: make ci-mingw-bootstrap
-      # There is no dist-i686-mingw-alt, so there is no prebuilt LLVM with assertions
-      NO_DOWNLOAD_CI_LLVM: 1
-    <<: *job-windows-25
-
   # x86_64-mingw is split into two jobs to run tests in parallel.
   - name: x86_64-mingw-1
     env:

src/doc/rustc/src/SUMMARY.md

@@ -81,7 +81,6 @@
     - [s390x-unknown-linux-musl](platform-support/s390x-unknown-linux-musl.md)
     - [sparc-unknown-none-elf](./platform-support/sparc-unknown-none-elf.md)
     - [sparcv9-sun-solaris](platform-support/solaris.md)
-    - [\*-pc-windows-gnullvm](platform-support/pc-windows-gnullvm.md)
     - [\*-nto-qnx-\*](platform-support/nto-qnx.md)
     - [\*-unikraft-linux-musl](platform-support/unikraft-linux-musl.md)
     - [\*-unknown-hermit](platform-support/hermit.md)
@@ -99,6 +98,8 @@
     - [wasm32-unknown-unknown](platform-support/wasm32-unknown-unknown.md)
     - [wasm32v1-none](platform-support/wasm32v1-none.md)
     - [wasm64-unknown-unknown](platform-support/wasm64-unknown-unknown.md)
+    - [windows-gnu](platform-support/windows-gnu.md)
+    - [windows-gnullvm](platform-support/windows-gnullvm.md)
     - [\*-win7-windows-gnu](platform-support/win7-windows-gnu.md)
     - [\*-win7-windows-msvc](platform-support/win7-windows-msvc.md)
     - [x86_64-fortanix-unknown-sgx](platform-support/x86_64-fortanix-unknown-sgx.md)

src/doc/rustc/src/platform-support.md

@@ -34,11 +34,10 @@ target | notes
 -------|-------
 [`aarch64-apple-darwin`](platform-support/apple-darwin.md) | ARM64 macOS (11.0+, Big Sur+)
 `aarch64-unknown-linux-gnu` | ARM64 Linux (kernel 4.1, glibc 2.17+)
-`i686-pc-windows-gnu` | 32-bit MinGW (Windows 10+, Windows Server 2016+, Pentium 4) [^x86_32-floats-return-ABI]
 `i686-pc-windows-msvc` | 32-bit MSVC (Windows 10+, Windows Server 2016+, Pentium 4) [^x86_32-floats-return-ABI]
 `i686-unknown-linux-gnu` | 32-bit Linux (kernel 3.2+, glibc 2.17+, Pentium 4) [^x86_32-floats-return-ABI]
 [`x86_64-apple-darwin`](platform-support/apple-darwin.md) | 64-bit macOS (10.12+, Sierra+)
-`x86_64-pc-windows-gnu` | 64-bit MinGW (Windows 10+, Windows Server 2016+)
+[`x86_64-pc-windows-gnu`](platform-support/windows-gnu.md) | 64-bit MinGW (Windows 10+, Windows Server 2016+)
 `x86_64-pc-windows-msvc` | 64-bit MSVC (Windows 10+, Windows Server 2016+)
 `x86_64-unknown-linux-gnu` | 64-bit Linux (kernel 3.2+, glibc 2.17+)
 
@@ -94,6 +93,7 @@ target | notes
 `armv7-unknown-linux-gnueabihf` | Armv7-A Linux, hardfloat (kernel 3.2, glibc 2.17)
 [`loongarch64-unknown-linux-gnu`](platform-support/loongarch-linux.md) | LoongArch64 Linux, LP64D ABI (kernel 5.19, glibc 2.36)
 [`loongarch64-unknown-linux-musl`](platform-support/loongarch-linux.md) | LoongArch64 Linux, LP64D ABI (kernel 5.19, musl 1.2.5)
+[`i686-pc-windows-gnu`](platform-support/windows-gnu.md) | 32-bit MinGW (Windows 10+, Windows Server 2016+, Pentium 4) [^x86_32-floats-return-ABI]
 `powerpc-unknown-linux-gnu` | PowerPC Linux (kernel 3.2, glibc 2.17)
 `powerpc64-unknown-linux-gnu` | PPC64 Linux (kernel 3.2, glibc 2.17)
 `powerpc64le-unknown-linux-gnu` | PPC64LE Linux (kernel 3.10, glibc 2.17)
@@ -140,7 +140,7 @@ target | std | notes
 [`aarch64-apple-ios-macabi`](platform-support/apple-ios-macabi.md) | ✓ | Mac Catalyst on ARM64
 [`aarch64-apple-ios-sim`](platform-support/apple-ios.md) | ✓ | Apple iOS Simulator on ARM64
 [`aarch64-linux-android`](platform-support/android.md) | ✓ | ARM64 Android
-[`aarch64-pc-windows-gnullvm`](platform-support/pc-windows-gnullvm.md) | ✓ | ARM64 MinGW (Windows 10+), LLVM ABI
+[`aarch64-pc-windows-gnullvm`](platform-support/windows-gnullvm.md) | ✓ | ARM64 MinGW (Windows 10+), LLVM ABI
 [`aarch64-unknown-fuchsia`](platform-support/fuchsia.md) | ✓ | ARM64 Fuchsia
 [`aarch64-unknown-linux-ohos`](platform-support/openharmony.md) | ✓ | ARM64 OpenHarmony
 `aarch64-unknown-none` | * | Bare ARM64, hardfloat
@@ -166,7 +166,7 @@ target | std | notes
 `i586-unknown-linux-gnu` | ✓ | 32-bit Linux (kernel 3.2, glibc 2.17, original Pentium) [^x86_32-floats-x87]
 `i586-unknown-linux-musl` | ✓ | 32-bit Linux (musl 1.2.3, original Pentium) [^x86_32-floats-x87]
 [`i686-linux-android`](platform-support/android.md) | ✓ | 32-bit x86 Android ([Pentium 4 plus various extensions](https://developer.android.com/ndk/guides/abis.html#x86)) [^x86_32-floats-return-ABI]
-[`i686-pc-windows-gnullvm`](platform-support/pc-windows-gnullvm.md) | ✓ | 32-bit x86 MinGW (Windows 10+, Pentium 4), LLVM ABI [^x86_32-floats-return-ABI]
+[`i686-pc-windows-gnullvm`](platform-support/windows-gnullvm.md) | ✓ | 32-bit x86 MinGW (Windows 10+, Pentium 4), LLVM ABI [^x86_32-floats-return-ABI]
 [`i686-unknown-freebsd`](platform-support/freebsd.md) | ✓ | 32-bit x86 FreeBSD (Pentium 4) [^x86_32-floats-return-ABI]
 `i686-unknown-linux-musl` | ✓ | 32-bit Linux with musl 1.2.3 (Pentium 4) [^x86_32-floats-return-ABI]
 [`i686-unknown-uefi`](platform-support/unknown-uefi.md) | ? | 32-bit UEFI (Pentium 4, softfloat)
@@ -202,7 +202,7 @@ target | std | notes
 [`x86_64-fortanix-unknown-sgx`](platform-support/x86_64-fortanix-unknown-sgx.md) | ✓ | [Fortanix ABI] for 64-bit Intel SGX
 [`x86_64-linux-android`](platform-support/android.md) | ✓ | 64-bit x86 Android
 [`x86_64-pc-solaris`](platform-support/solaris.md) | ✓ | 64-bit x86 Solaris 11.4
-[`x86_64-pc-windows-gnullvm`](platform-support/pc-windows-gnullvm.md) | ✓ | 64-bit x86 MinGW (Windows 10+), LLVM ABI
+[`x86_64-pc-windows-gnullvm`](platform-support/windows-gnullvm.md) | ✓ | 64-bit x86 MinGW (Windows 10+), LLVM ABI
 [`x86_64-unknown-fuchsia`](platform-support/fuchsia.md) | ✓ | 64-bit x86 Fuchsia
 `x86_64-unknown-linux-gnux32` | ✓ | 64-bit Linux (x32 ABI) (kernel 4.15, glibc 2.27)
 [`x86_64-unknown-linux-ohos`](platform-support/openharmony.md) | ✓ | x86_64 OpenHarmony

src/doc/rustc/src/platform-support/windows-gnu.md

@@ -0,0 +1,32 @@
+# \*-windows-gnu
+
+**⚠️ This documentation page is a stub, you can help improving it by sending a PR. ⚠️**
+
+**Tier: 1/2 (with host tools)**
+
+Target triples available:
+- `i686-pc-windows-gnu`: Tier 2
+- `x86_64-pc-windows-gnu`: Tier 1
+
+## Target maintainers
+
+**⚠️ These targets do not have any maintainers and are not properly maintained. ⚠️**
+
+If you are using this target, consider signing up to become a target maintainer.
+See the target tier policy for details.
+Without maintainers, these targets may be demoted in the future.
+
+## Requirements
+
+These targets support std and host tools.
+
+Unlike their MSVC counterparts, windows-gnu targets support cross-compilation and are free of all MSVC licensing implications.
+
+They follow Windows calling convention for `extern "C"`.
+
+Like with any other Windows target, created binaries are in PE format.
+
+## Building Rust programs
+
+Rust does ship a pre-compiled std library for those targets.
+That means one can easily compile and cross-compile for those targets from other hosts if C proper toolchain is installed.

src/doc/rustc/src/platform-support/pc-windows-gnullvm.md renamed to src/doc/rustc/src/platform-support/windows-gnullvm.md

@@ -1,8 +1,8 @@
-# \*-pc-windows-gnullvm
+# \*-windows-gnullvm
 
 **Tier: 2 (without host tools)**
 
-Windows targets similar to `*-pc-windows-gnu` but using UCRT as the runtime and various LLVM tools/libraries instead of GCC/Binutils.
+Windows targets similar to `*-windows-gnu` but using UCRT as the runtime and various LLVM tools/libraries instead of GCC/Binutils.
 
 Target triples available so far:
 - `aarch64-pc-windows-gnullvm`
@@ -17,9 +17,9 @@ Target triples available so far:
 ## Requirements
 
 The easiest way to obtain these targets is cross-compilation, but native build from `x86_64-pc-windows-gnu` is possible with few hacks which I don't recommend.
-Std support is expected to be on par with `*-pc-windows-gnu`.
+Std support is expected to be on par with `*-windows-gnu`.
 
-Binaries for this target should be at least on par with `*-pc-windows-gnu` in terms of requirements and functionality.
+Binaries for this target should be at least on par with `*-windows-gnu` in terms of requirements and functionality.
 
 Those targets follow Windows calling convention for `extern "C"`.