diff --git a/tests/run-make/compiler-builtins/rmake.rs b/tests/run-make/compiler-builtins/rmake.rs
index daa12d2986eb9..bdef0e9d70260 100644
--- a/tests/run-make/compiler-builtins/rmake.rs
+++ b/tests/run-make/compiler-builtins/rmake.rs
@@ -15,46 +15,38 @@
 #![deny(warnings)]
 
 use std::collections::HashSet;
-use std::path::PathBuf;
 
 use run_make_support::object::read::Object;
 use run_make_support::object::read::archive::ArchiveFile;
 use run_make_support::object::{ObjectSection, ObjectSymbol, RelocationTarget};
 use run_make_support::rfs::{read, read_dir};
-use run_make_support::{cmd, env_var, object};
+use run_make_support::{cargo, env_var, object, path, target};
 
 fn main() {
-    let target_dir = PathBuf::from("target");
-    let target = env_var("TARGET");
-
-    println!("Testing compiler_builtins for {}", target);
-
-    let manifest_path = PathBuf::from("Cargo.toml");
-
-    let path = env_var("PATH");
-    let rustc = env_var("RUSTC");
-    let cargo = env_var("CARGO");
-    let mut cmd = cmd(cargo);
-    cmd.args(&[
-        "build",
-        "--manifest-path",
-        manifest_path.to_str().unwrap(),
-        "-Zbuild-std=core",
-        "--target",
-        &target,
-    ])
-    .env("PATH", path)
-    .env("RUSTC", rustc)
-    .env("RUSTFLAGS", "-Copt-level=0 -Cdebug-assertions=yes")
-    .env("CARGO_TARGET_DIR", &target_dir)
-    .env("RUSTC_BOOTSTRAP", "1")
-    // Visual Studio 2022 requires that the LIB env var be set so it can
-    // find the Windows SDK.
-    .env("LIB", std::env::var("LIB").unwrap_or_default());
-
-    cmd.run();
-
-    let rlibs_path = target_dir.join(target).join("debug").join("deps");
+    let target_dir = path("target");
+
+    println!("Testing compiler_builtins for {}", target());
+
+    cargo()
+        .args(&[
+            "build",
+            "--manifest-path",
+            "Cargo.toml",
+            "-Zbuild-std=core",
+            "--target",
+            &target(),
+        ])
+        .env("PATH", env_var("PATH"))
+        .env("RUSTC", env_var("RUSTC"))
+        .env("RUSTFLAGS", "-Copt-level=0 -Cdebug-assertions=yes")
+        .env("CARGO_TARGET_DIR", &target_dir)
+        .env("RUSTC_BOOTSTRAP", "1")
+        // Visual Studio 2022 requires that the LIB env var be set so it can
+        // find the Windows SDK.
+        .env("LIB", std::env::var("LIB").unwrap_or_default())
+        .run();
+
+    let rlibs_path = target_dir.join(target()).join("debug").join("deps");
     let compiler_builtins_rlib = read_dir(rlibs_path)
         .find_map(|e| {
             let path = e.unwrap().path();
diff --git a/tests/run-make/thumb-none-cortex-m/rmake.rs b/tests/run-make/thumb-none-cortex-m/rmake.rs
index 9112646290f20..77bd3b38982d7 100644
--- a/tests/run-make/thumb-none-cortex-m/rmake.rs
+++ b/tests/run-make/thumb-none-cortex-m/rmake.rs
@@ -14,10 +14,7 @@
 
 //@ only-thumb
 
-use std::path::PathBuf;
-
-use run_make_support::rfs::create_dir;
-use run_make_support::{cmd, env_var, target};
+use run_make_support::{cargo, cmd, env, env_var, target};
 
 const CRATE: &str = "cortex-m";
 const CRATE_URL: &str = "https://github.com/rust-embedded/cortex-m";
@@ -28,32 +25,25 @@ fn main() {
     // See below link for git usage:
     // https://stackoverflow.com/questions/3489173#14091182
     cmd("git").args(["clone", CRATE_URL, CRATE]).run();
-    std::env::set_current_dir(CRATE).unwrap();
+    env::set_current_dir(CRATE);
     cmd("git").args(["reset", "--hard", CRATE_SHA1]).run();
 
-    let target_dir = PathBuf::from("target");
-    let manifest_path = PathBuf::from("Cargo.toml");
-
-    let path = env_var("PATH");
-    let rustc = env_var("RUSTC");
-    let cargo = env_var("CARGO");
     // FIXME: extract cargo invocations to a proper command
     // https://github.com/rust-lang/rust/issues/128734
-    let mut cmd = cmd(cargo);
-    cmd.args(&[
-        "build",
-        "--manifest-path",
-        manifest_path.to_str().unwrap(),
-        "-Zbuild-std=core",
-        "--target",
-        &target(),
-    ])
-    .env("PATH", path)
-    .env("RUSTC", rustc)
-    .env("CARGO_TARGET_DIR", &target_dir)
-    // Don't make lints fatal, but they need to at least warn
-    // or they break Cargo's target info parsing.
-    .env("RUSTFLAGS", "-Copt-level=0 -Cdebug-assertions=yes --cap-lints=warn");
-
-    cmd.run();
+    cargo
+        .args(&[
+            "build",
+            "--manifest-path",
+            "Cargo.toml",
+            "-Zbuild-std=core",
+            "--target",
+            &target(),
+        ])
+        .env("PATH", env_var("PATH"))
+        .env("RUSTC", env_var("RUSTC"))
+        .env("CARGO_TARGET_DIR", "target")
+        // Don't make lints fatal, but they need to at least warn
+        // or they break Cargo's target info parsing.
+        .env("RUSTFLAGS", "-Copt-level=0 -Cdebug-assertions=yes --cap-lints=warn")
+        .run();
 }