Add powerpc-unknown-openbsd target

Add powerpc-unknown-openbsd target

* Fix missing abi::endian crate
* Missing platform-support.md

Author: Yn0ga

compiler/rustc_target/src/spec/mod.rs

@@ -694,6 +694,7 @@ supported_targets! {
     ("i686-unknown-openbsd", i686_unknown_openbsd),
     ("sparc64-unknown-openbsd", sparc64_unknown_openbsd),
     ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
+    ("powerpc-unknown-openbsd", powerpc_unknown_openbsd),
 
     ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
     ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),

compiler/rustc_target/src/spec/powerpc_unknown_openbsd.rs

@@ -0,0 +1,16 @@
+use crate::abi::Endian;
+use crate::spec::Target;
+
+pub fn target() -> Target {
+    let mut base = super::openbsd_base::opts();
+    base.endian = Endian::Big;
+    base.max_atomic_width = Some(32);
+
+    Target {
+        llvm_target: "powerpc-unknown-openbsd".to_string(),
+        pointer_width: 32,
+        data_layout: "E-m:e-p:32:32-i64:64-n32".to_string(),
+        arch: "powerpc".to_string(),
+        options: base,
+    }
+}

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

@@ -198,6 +198,7 @@ target | std | host | notes
 `powerpc-unknown-linux-gnuspe` | ✓ |  | PowerPC SPE Linux
 `powerpc-unknown-linux-musl` | ? |  |
 `powerpc-unknown-netbsd` | ✓ | ✓ |
+`powerpc-unknown-openbsd` | ? |  |
 `powerpc-wrs-vxworks` | ? |  |
 `powerpc-wrs-vxworks-spe` | ? |  |
 `powerpc64-unknown-freebsd` | ✓ | ✓ | PPC64 FreeBSD (ELFv1 and ELFv2)