Rollup merge of #149962 - Gelbpunkt:powerpc64-musl-tier-2, r=Mark-Simulacrum

Promote powerpc64-unknown-linux-musl to tier 2 with host tools

MCP: https://github.com/rust-lang/compiler-team/issues/946

Tested by compiling on an x86_64 host via `DEPLOY=1 ./src/ci/docker/run.sh dist-powerpc64-linux-musl` and running on Alpine Linux ppc64:

```
root@algol /t/rust-nightly-powerpc64-unknown-linux-musl# bash install.sh
install: creating uninstall script at /usr/local/lib/rustlib/uninstall.sh
install: installing component 'rustc'
install: installing component 'rust-std-powerpc64-unknown-linux-musl'
install: installing component 'cargo'
install: installing component 'rustfmt-preview'
install: installing component 'rust-analyzer-preview'
install: installing component 'llvm-tools-preview'
install: installing component 'clippy-preview'
install: installing component 'miri-preview'
install: installing component 'rust-analysis-powerpc64-unknown-linux-musl'
install: installing component 'llvm-bitcode-linker-preview'

    rust installed.

root@algol /t/rust-nightly-powerpc64-unknown-linux-musl# echo 'fn main() { println!("hello world"); }' > test.rs
root@algol /t/rust-nightly-powerpc64-unknown-linux-musl# which rustc
/usr/local/bin/rustc
root@algol /t/rust-nightly-powerpc64-unknown-linux-musl# rustc test.rs
root@algol /t/rust-nightly-powerpc64-unknown-linux-musl# ./test
hello world
root@algol /t/rust-nightly-powerpc64-unknown-linux-musl# file test
test: ELF 64-bit MSB pie executable, 64-bit PowerPC or cisco 7500, OpenPOWER ELF V2 ABI, version 1 (SYSV), dynamically linked, interpreter /lib/ld-musl-powerpc64.so.1, BuildID[sha1]=90a0fa543b3d42588ad32c5b858e56ac9c56faed, with debug_info, not stripped
```

I renamed the glibc job and created a new one for musl since the same is done for the little-endian targets.

Implements rust-lang/rust#149938

try-job: dist-powerpc64-linux-gnu
try-job: dist-powerpc64-linux-musl

compiler/rustc_target/src/spec/targets/powerpc64_unknown_linux_musl.rs

@@ -17,8 +17,8 @@ pub(crate) fn target() -> Target {
         llvm_target: "powerpc64-unknown-linux-musl".into(),
         metadata: TargetMetadata {
             description: Some("64-bit PowerPC Linux with musl 1.2.5".into()),
-            tier: Some(3),
-            host_tools: Some(false),
+            tier: Some(2),
+            host_tools: Some(true),
             std: Some(true),
         },
         pointer_width: 64,

src/bootstrap/src/core/build_steps/llvm.rs

@@ -244,6 +244,7 @@ pub(crate) fn is_ci_llvm_available_for_target(
         ("loongarch64-unknown-linux-musl", false),
         ("powerpc-unknown-linux-gnu", false),
         ("powerpc64-unknown-linux-gnu", false),
+        ("powerpc64-unknown-linux-musl", false),
         ("powerpc64le-unknown-linux-gnu", false),
         ("powerpc64le-unknown-linux-musl", false),
         ("riscv64gc-unknown-linux-gnu", false),

src/bootstrap/src/core/download.rs

@@ -460,6 +460,7 @@ pub(crate) fn is_download_ci_available(target_triple: &str, llvm_assertions: boo
         "loongarch64-unknown-linux-gnu",
         "powerpc-unknown-linux-gnu",
         "powerpc64-unknown-linux-gnu",
+        "powerpc64-unknown-linux-musl",
         "powerpc64le-unknown-linux-gnu",
         "powerpc64le-unknown-linux-musl",
         "riscv64gc-unknown-linux-gnu",

src/ci/docker/host-x86_64/dist-powerpc64-linux-gnu/Dockerfile

@@ -11,7 +11,7 @@ RUN sh /scripts/rustbuild-setup.sh
 WORKDIR /tmp
 
 COPY scripts/crosstool-ng-build.sh /scripts/
-COPY host-x86_64/dist-powerpc64-linux/powerpc64-linux-gnu.defconfig /tmp/crosstool.defconfig
+COPY host-x86_64/dist-powerpc64-linux-gnu/powerpc64-linux-gnu.defconfig /tmp/crosstool.defconfig
 RUN /scripts/crosstool-ng-build.sh
 
 COPY scripts/sccache.sh /scripts/

src/ci/docker/host-x86_64/dist-powerpc64-linux-musl/Dockerfile

@@ -0,0 +1,39 @@
+FROM ubuntu:22.04
+
+COPY scripts/cross-apt-packages.sh /scripts/
+RUN sh /scripts/cross-apt-packages.sh
+
+COPY scripts/crosstool-ng.sh /scripts/
+RUN sh /scripts/crosstool-ng.sh
+
+COPY scripts/rustbuild-setup.sh /scripts/
+RUN sh /scripts/rustbuild-setup.sh
+
+WORKDIR /tmp
+
+COPY scripts/crosstool-ng-build.sh /scripts/
+COPY host-x86_64/dist-powerpc64-linux-musl/powerpc64-unknown-linux-musl.defconfig /tmp/crosstool.defconfig
+RUN /scripts/crosstool-ng-build.sh
+
+COPY scripts/sccache.sh /scripts/
+RUN sh /scripts/sccache.sh
+
+ENV PATH=$PATH:/x-tools/powerpc64-unknown-linux-musl/bin
+
+ENV \
+    AR_powerpc64_unknown_linux_musl=powerpc64-unknown-linux-musl-ar \
+    CC_powerpc64_unknown_linux_musl=powerpc64-unknown-linux-musl-gcc \
+    CXX_powerpc64_unknown_linux_musl=powerpc64-unknown-linux-musl-g++
+
+ENV HOSTS=powerpc64-unknown-linux-musl
+
+ENV RUST_CONFIGURE_ARGS \
+    --enable-extended \
+    --enable-full-tools \
+    --enable-profiler \
+    --enable-sanitizers \
+    --disable-docs \
+    --set target.powerpc64-unknown-linux-musl.crt-static=false \
+    --musl-root-powerpc64=/x-tools/powerpc64-unknown-linux-musl/powerpc64-unknown-linux-musl/sysroot/usr
+
+ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS

src/ci/docker/host-x86_64/dist-powerpc64-linux-musl/powerpc64-unknown-linux-musl.defconfig

@@ -0,0 +1,15 @@
+CT_CONFIG_VERSION="4"
+CT_EXPERIMENTAL=y
+CT_PREFIX_DIR="/x-tools/${CT_TARGET}"
+CT_USE_MIRROR=y
+CT_MIRROR_BASE_URL="https://ci-mirrors.rust-lang.org/rustc"
+CT_ARCH_POWERPC=y
+CT_ARCH_64=y
+CT_ARCH_ABI="elfv2"
+# CT_DEMULTILIB is not set
+CT_KERNEL_LINUX=y
+CT_LINUX_V_4_19=y
+CT_LIBC_MUSL=y
+CT_MUSL_V_1_2_5=y
+CT_CC_LANG_CXX=y
+CT_GETTEXT_NEEDED=y

src/ci/github-actions/jobs.yml

@@ -232,7 +232,10 @@ auto:
   - name: dist-powerpc-linux
     <<: *job-linux-4c
 
-  - name: dist-powerpc64-linux
+  - name: dist-powerpc64-linux-gnu
+    <<: *job-linux-4c
+
+  - name: dist-powerpc64-linux-musl
     <<: *job-linux-4c
 
   - name: dist-powerpc64le-linux-gnu

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

@@ -100,6 +100,7 @@ target | notes
 [`i686-pc-windows-gnu`](platform-support/windows-gnu.md) | 32-bit MinGW (Windows 10+, Windows Server 2016+, Pentium 4) [^x86_32-floats-return-ABI] [^win32-msvc-alignment]
 `powerpc-unknown-linux-gnu` | PowerPC Linux (kernel 3.2+, glibc 2.17)
 `powerpc64-unknown-linux-gnu` | PPC64 Linux (kernel 3.2+, glibc 2.17)
+[`powerpc64-unknown-linux-musl`](platform-support/powerpc64-unknown-linux-musl.md) | PPC64 Linux (kernel 4.19+, musl 1.2.5)
 [`powerpc64le-unknown-linux-gnu`](platform-support/powerpc64le-unknown-linux-gnu.md) | PPC64LE Linux (kernel 3.10+, glibc 2.17)
 [`powerpc64le-unknown-linux-musl`](platform-support/powerpc64le-unknown-linux-musl.md) | PPC64LE Linux (kernel 4.19+, musl 1.2.5)
 [`riscv64gc-unknown-linux-gnu`](platform-support/riscv64gc-unknown-linux-gnu.md) | RISC-V Linux (kernel 4.20+, glibc 2.29)
@@ -371,7 +372,6 @@ target | std | host | notes
 [`powerpc-wrs-vxworks-spe`](platform-support/vxworks.md) | ✓ |  |
 [`powerpc64-ibm-aix`](platform-support/aix.md) | ? |  | 64-bit AIX (7.2 and newer)
 [`powerpc64-unknown-freebsd`](platform-support/freebsd.md) | ✓ | ✓ | PPC64 FreeBSD (ELFv2)
-[`powerpc64-unknown-linux-musl`](platform-support/powerpc64-unknown-linux-musl.md) | ✓ | ✓ | PPC64 Linux (kernel 4.19, musl 1.2.5)
 [`powerpc64-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | OpenBSD/powerpc64
 [`powerpc64-wrs-vxworks`](platform-support/vxworks.md) | ✓ |  |
 [`powerpc64le-unknown-freebsd`](platform-support/freebsd.md) | ✓ | ✓ | PPC64LE FreeBSD

src/doc/rustc/src/platform-support/powerpc64-unknown-linux-musl.md

@@ -1,10 +1,13 @@
 # powerpc64-unknown-linux-musl
 
-**Tier: 3**
+**Tier: 2**
 
 Target for 64-bit big endian PowerPC Linux programs using musl libc.
 This target uses the ELF v2 ABI.
 
+The baseline CPU required is a PowerPC 970, which means AltiVec is required and
+the oldest IBM server CPU supported is therefore POWER6.
+
 ## Target maintainers
 
 [@Gelbpunkt](https://github.com/Gelbpunkt)
@@ -38,9 +41,8 @@ linker = "powerpc64-linux-musl-gcc"
 
 ## Building Rust programs
 
-Rust does not yet ship pre-compiled artifacts for this target. To compile for
-this target, you will first need to build Rust with the target enabled (see
-"Building the target" above).
+This target is distributed through `rustup`, and otherwise requires no
+special configuration.
 
 ## Cross-compilation