librustc_target: Initial support for riscv32gc_unknown_linux_gnu

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

compiler/rustc_target/src/spec/mod.rs

@@ -654,6 +654,7 @@ supported_targets! {
     ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
     ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
     ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
+    ("riscv32gc-unknown-linux-gnu", riscv32gc_unknown_linux_gnu),
     ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
     ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
     ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),

compiler/rustc_target/src/spec/riscv32gc_unknown_linux_gnu.rs

@@ -0,0 +1,25 @@
+use crate::spec::{CodeModel, LinkerFlavor, Target, TargetOptions, TargetResult};
+
+pub fn target() -> TargetResult {
+    Ok(Target {
+        llvm_target: "riscv32-unknown-linux-gnu".to_string(),
+        target_endian: "little".to_string(),
+        target_pointer_width: "32".to_string(),
+        target_c_int_width: "32".to_string(),
+        target_env: "gnu".to_string(),
+        data_layout: "e-m:e-p:32:32-i64:64-n32-S128".to_string(),
+        arch: "riscv32".to_string(),
+        target_os: "linux".to_string(),
+        target_vendor: "unknown".to_string(),
+        linker_flavor: LinkerFlavor::Gcc,
+        options: TargetOptions {
+            abi_blacklist: super::riscv_base::abi_blacklist(),
+            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_base::opts()
+        },
+    })
+}