Rollup merge of #82202 - kraj:kraj/riscv-musl, r=estebank

add specs for riscv32/riscv64 musl targets

Signed-off-by: Khem Raj <raj.khem@gmail.com>

compiler/rustc_target/src/spec/mod.rs

@@ -783,9 +783,11 @@ supported_targets! {
     ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
     ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
     ("riscv32gc-unknown-linux-gnu", riscv32gc_unknown_linux_gnu),
+    ("riscv32gc-unknown-linux-musl", riscv32gc_unknown_linux_musl),
     ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
     ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
     ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
+    ("riscv64gc-unknown-linux-musl", riscv64gc_unknown_linux_musl),
 
     ("aarch64-unknown-none", aarch64_unknown_none),
     ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),

compiler/rustc_target/src/spec/riscv32gc_unknown_linux_musl.rs

@@ -0,0 +1,19 @@
+use crate::spec::{CodeModel, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "riscv32-unknown-linux-musl".to_string(),
+        pointer_width: 32,
+        data_layout: "e-m:e-p:32:32-i64:64-n32-S128".to_string(),
+        arch: "riscv32".to_string(),
+        options: TargetOptions {
+            unsupported_abis: super::riscv_base::unsupported_abis(),
+            code_model: Some(CodeModel::Medium),
+            cpu: "generic-rv32".to_string(),
+            features: "+m,+a,+f,+d,+c".to_string(),
+            llvm_abiname: "ilp32d".to_string(),
+            max_atomic_width: Some(32),
+            ..super::linux_musl_base::opts()
+        },
+    }
+}

compiler/rustc_target/src/spec/riscv64gc_unknown_linux_musl.rs

@@ -0,0 +1,19 @@
+use crate::spec::{CodeModel, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "riscv64-unknown-linux-musl".to_string(),
+        pointer_width: 64,
+        data_layout: "e-m:e-p:64:64-i64:64-i128:128-n64-S128".to_string(),
+        arch: "riscv64".to_string(),
+        options: TargetOptions {
+            unsupported_abis: super::riscv_base::unsupported_abis(),
+            code_model: Some(CodeModel::Medium),
+            cpu: "generic-rv64".to_string(),
+            features: "+m,+a,+f,+d,+c".to_string(),
+            llvm_abiname: "lp64d".to_string(),
+            max_atomic_width: Some(64),
+            ..super::linux_musl_base::opts()
+        },
+    }
+}

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

@@ -204,7 +204,9 @@ target | std | host | notes
 `powerpc64-unknown-linux-musl` | ? |  |
 `powerpc64-wrs-vxworks` | ? |  |
 `powerpc64le-unknown-linux-musl` | ? |  |
+`riscv64gc-unknown-linux-musl` |   |   | RISC-V Linux (kernel 4.20, musl 1.2.0)
 `riscv32gc-unknown-linux-gnu` |   |   | RISC-V Linux (kernel 5.4, glibc 2.33)
+`riscv32gc-unknown-linux-musl` |   |   | RISC-V Linux (kernel 5.4, musl + RISCV32 support patches)
 `sparc-unknown-linux-gnu` | ✓ |  | 32-bit SPARC Linux
 `sparc64-unknown-netbsd` | ✓ | ✓ | NetBSD/sparc64
 `sparc64-unknown-openbsd` | ? |  |