[difftest] use link-cplusplus

difftest/Cargo.toml

@@ -21,3 +21,4 @@ tracing-subscriber = { version = "0.3", features = ["env-filter", "ansi"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 num-bigint = "0.4.6"
+link-cplusplus = "1.0.9"

difftest/online_drive/Cargo.toml

@@ -8,6 +8,7 @@ common = { path = "../test_common" }
 spike_rs = { path = "../spike_rs" }
 clap = { workspace = true }
 tracing = { workspace = true }
+link-cplusplus = { workspace = true }
 hex = "0.4.3"
 
 [build-dependencies]

difftest/online_drive/build.rs

@@ -16,7 +16,6 @@ fn main() {
   println!("cargo::rustc-link-lib=static=dpi_pre_link");
   println!("cargo::rustc-link-lib=static=VTestBench");
   println!("cargo::rustc-link-lib=static=verilated");
-  println!("cargo::rustc-link-lib=stdc++");
   println!("cargo::rustc-link-lib=z");
   println!("cargo::rerun-if-env-changed=VERILATED_LIB_DIR");
 }

difftest/online_drive/src/main.rs

@@ -5,6 +5,8 @@ use common::CommonArgs;
 mod dpi;
 mod drive;
 
+extern crate link_cplusplus;
+
 #[derive(Parser)]
 pub(crate) struct OfflineArgs {
   #[command(flatten)]

difftest/spike_rs/Cargo.toml

@@ -6,5 +6,6 @@ edition = "2021"
 [dependencies]
 anyhow = { workspace = true }
 tracing = { workspace = true }
+link-cplusplus = { workspace = true }
 libc = "0.2.155"
 xmas-elf = "0.9.1"

difftest/spike_rs/src/lib.rs

@@ -5,6 +5,8 @@ use libc::c_char;
 use std::ffi::{CStr, CString};
 use tracing::trace;
 
+extern crate link_cplusplus;
+
 pub fn clip(binary: u32, a: i32, b: i32) -> u32 {
   assert!(a <= b, "a should be less than or equal to b");
   let nbits = b - a + 1;