feat: succinct-zkvm target

Author: nhtyy

compiler/rustc_target/src/spec/mod.rs

@@ -1954,6 +1954,7 @@ supported_targets! {
 
     ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
     ("riscv32im-risc0-zkvm-elf", riscv32im_risc0_zkvm_elf),
+    ("riscv32im-succinct-zkvm-elf", riscv32im_succinct_zkvm_elf),
     ("riscv32im-unknown-none-elf", riscv32im_unknown_none_elf),
     ("riscv32ima-unknown-none-elf", riscv32ima_unknown_none_elf),
     ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),

compiler/rustc_target/src/spec/targets/riscv32im_succinct_zkvm_elf.rs

@@ -0,0 +1,42 @@
+use crate::spec::{
+    Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetMetadata, TargetOptions,
+};
+
+pub(crate) fn target() -> Target {
+    Target {
+        data_layout: "e-m:e-p:32:32-i64:64-n32-S128".into(),
+        llvm_target: "riscv32".into(),
+        metadata: TargetMetadata {
+            description: Some("Succinct's zero-knowledge Virtual Machine (RV32IM ISA)".into()),
+            tier: Some(3),
+            host_tools: Some(false),
+            std: None,
+        },
+        pointer_width: 32,
+        arch: "riscv32".into(),
+
+        options: TargetOptions {
+            os: "succinct-zkvm".into(),
+            vendor: "succinct".into(),
+            linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
+            linker: Some("rust-lld".into()),
+            cpu: "generic-rv32".into(),
+
+            // The zkvm is singlethreaded and all operations are atomic.
+            // The std-lib is compiled with lowered atomicsa and the default Succinct build tools
+            // enforce this on programs.
+            max_atomic_width: Some(64),
+            atomic_cas: true,
+
+            features: "+m".into(),
+            llvm_abiname: "ilp32".into(),
+            executables: true,
+            panic_strategy: PanicStrategy::Abort,
+            relocation_model: RelocModel::Static,
+            emit_debug_gdb_scripts: false,
+            eh_frame_header: false,
+            singlethread: true,
+            ..Default::default()
+        },
+    }
+}

src/bootstrap/src/core/sanity.rs

@@ -35,6 +35,7 @@ pub struct Finder {
 const STAGE0_MISSING_TARGETS: &[&str] = &[
     // just a dummy comment so the list doesn't get onelined
     "wasm32-wali-linux-musl",
+    "riscv32im-succinct-zkvm-elf"
 ];
 
 /// Minimum version threshold for libstdc++ required when using prebuilt LLVM

src/tools/build-manifest/src/main.rs

@@ -138,6 +138,7 @@ static TARGETS: &[&str] = &[
     "powerpc64le-unknown-linux-musl",
     "riscv32i-unknown-none-elf",
     "riscv32im-risc0-zkvm-elf",
+    "riscv32im-succinct-zkvm-elf",
     "riscv32im-unknown-none-elf",
     "riscv32ima-unknown-none-elf",
     "riscv32imc-unknown-none-elf",

tests/assembly/targets/targets-elf.rs

@@ -421,6 +421,9 @@
 //@ revisions: riscv32im_risc0_zkvm_elf
 //@ [riscv32im_risc0_zkvm_elf] compile-flags: --target riscv32im-risc0-zkvm-elf
 //@ [riscv32im_risc0_zkvm_elf] needs-llvm-components: riscv
+//@ revisions: riscv32im_succinct_zkvm_elf
+//@ [riscv32im_succinct_zkvm_elf] compile-flags: --target riscv32im-succinct-zkvm-elf
+//@ [riscv32im_succinct_zkvm_elf] needs-llvm-components: riscv
 //@ revisions: riscv32im_unknown_none_elf
 //@ [riscv32im_unknown_none_elf] compile-flags: --target riscv32im-unknown-none-elf
 //@ [riscv32im_unknown_none_elf] needs-llvm-components: riscv