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Rollup merge of #137868 - taiki-e:powerpcspe-doc, r=workingjubilee

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Add minimal platform support documentation for powerpc-unknown-linux-gnuspe

Per https://github.com/rust-lang/rust/pull/137860#issuecomment-2692358259, add minimal platform support documentation, including a brief summary and links to more detailed information about this target.

The added documentation is minimal. This is somewhat similar to [powerpc-unknown-openbsd, which also has no target maintainer](https://doc.rust-lang.org/nightly/rustc/platform-support/powerpc-unknown-openbsd.html). The rest of the template is left to target maintainers.

I also updated powerpc-unknown-linux-muslspe platform support documentation and added link to powerpc-unknown-linux-gnuspe platform support documentation.

cc ```@glaubitz```
cc ```@BKPepe```
r? workingjubilee

```@rustbot``` label +O-PowerPC
This commit is contained in:
Michael Goulet 2025-03-06 12:22:24 -05:00 committed by GitHub
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src/doc/rustc/src/SUMMARY.md
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@ -69,6 +69,7 @@
- [mipsisa\*r6\*-unknown-linux-gnu\*](platform-support/mips-release-6.md)
- [nvptx64-nvidia-cuda](platform-support/nvptx64-nvidia-cuda.md)
- [powerpc-unknown-openbsd](platform-support/powerpc-unknown-openbsd.md)
- [powerpc-unknown-linux-gnuspe](platform-support/powerpc-unknown-linux-gnuspe.md)
- [powerpc-unknown-linux-muslspe](platform-support/powerpc-unknown-linux-muslspe.md)
- [powerpc64-ibm-aix](platform-support/aix.md)
- [powerpc64le-unknown-linux-musl](platform-support/powerpc64le-unknown-linux-musl.md)

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src/doc/rustc/src/platform-support.md
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@ -348,9 +348,9 @@ target | std | host | notes
[`mipsisa64r6el-unknown-linux-gnuabi64`](platform-support/mips-release-6.md) | ✓ | ✓ | 64-bit MIPS Release 6 Little Endian
`msp430-none-elf` | * | | 16-bit MSP430 microcontrollers
[`powerpc-unknown-freebsd`](platform-support/freebsd.md) | ? | | PowerPC FreeBSD
`powerpc-unknown-linux-gnuspe` | ✓ | | PowerPC SPE Linux
[`powerpc-unknown-linux-gnuspe`](platform-support/powerpc-unknown-linux-gnuspe.md) | ✓ | | PowerPC SPE Linux
`powerpc-unknown-linux-musl` | ? | | PowerPC Linux with musl 1.2.3
[`powerpc-unknown-linux-muslspe`](platform-support/powerpc-unknown-linux-muslspe.md) | ? | | PowerPC SPE Linux
[`powerpc-unknown-linux-muslspe`](platform-support/powerpc-unknown-linux-muslspe.md) | ? | | PowerPC SPE Linux with musl 1.2.3
[`powerpc-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | NetBSD 32-bit powerpc systems
[`powerpc-unknown-openbsd`](platform-support/powerpc-unknown-openbsd.md) | * | |
[`powerpc-wrs-vxworks`](platform-support/vxworks.md) | ✓ | |

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src/doc/rustc/src/platform-support/powerpc-unknown-linux-gnuspe.md Normal file
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# powerpc-unknown-linux-gnuspe
**Tier: 3**
`powerpc-unknown-linux-gnuspe` is a target for Linux on 32-bit PowerPC
processors that implement the Signal Processing Engine (SPE), such as e500, and
uses a different ABI than standard `powerpc-unknown-linux-gnu`.
When building for other 32-bit PowerPC processors, use
`powerpc-unknown-linux-gnu` instead.
See also [Debian Wiki](https://wiki.debian.org/PowerPCSPEPort) for details on
this platform, and [ABI reference](https://web.archive.org/web/20120608163804/https://www.power.org/resources/downloads/Power-Arch-32-bit-ABI-supp-1.0-Unified.pdf)
for details on SPE ABI.
Note that support for PowerPC SPE by GCC was [removed in GCC 9](https://gcc.gnu.org/gcc-8/changes.html),
so recent GCC cannot be used as linker/compiler for this target.
## Target maintainers
There are currently no formally documented target maintainers.

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src/doc/rustc/src/platform-support/powerpc-unknown-linux-muslspe.md
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**Tier: 3**
This target is very similar to already existing ones like `powerpc_unknown_linux_musl` and `powerpc_unknown_linux_gnuspe`.
This target is very similar to already existing ones like `powerpc-unknown-linux-musl` and `powerpc-unknown-linux-gnuspe`.
This one has PowerPC SPE support for musl. Unfortunately, the last supported gcc version with PowerPC SPE is 8.4.0.
See also [platform support documentation of `powerpc-unknown-linux-gnuspe`](powerpc-unknown-linux-gnuspe.md) for information about PowerPC SPE.
## Target maintainers
- [@BKPepe](https://github.com/BKPepe)