feat: build the backend on stable Rust

.github/workflows/ci.yml

@@ -12,8 +12,7 @@ jobs:
       RUSTFLAGS: -Dwarnings
     steps:
       - uses: actions/checkout@v4
-      # FIXME: use stable once rftrace supports stable
-      - uses: dtolnay/rust-toolchain@nightly
+      - uses: dtolnay/rust-toolchain@stable
         with:
           targets: x86_64-unknown-none
       - run: cargo clippy --all-features
@@ -68,9 +67,11 @@ jobs:
         run: |
           sudo apt-get update
           sudo apt-get install uftrace
-      - uses: mkroening/rust-toolchain-toml@main
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: llvm-tools
       - name: Build
-        run: cargo +nightly rustc -- -Zinstrument-mcount -C passes="ee-instrument<post-inline>"
+        run: cargo rustc -- -Zinstrument-mcount -C passes="ee-instrument<post-inline>"
       - name: Run
         run: |
           mkdir tracedir

examples/c/makefile

@@ -2,10 +2,10 @@ default: out/debug/librftrace.a out/debug/librftrace_frontend_ffi.a
 	gcc main.c -p -pthread -ldl -lrftrace -lrftrace_frontend_ffi -Lout/debug/ -o test
 
 out/debug/librftrace.a:
-	cargo +nightly build --manifest-path ../../rftrace/Cargo.toml --target-dir out
+	cargo build --manifest-path ../../rftrace/Cargo.toml --target-dir out
 
 out/debug/librftrace_frontend_ffi.a:
-	cargo +nightly build --manifest-path ../../rftrace-frontend-ffi/Cargo.toml --target-dir out
+	cargo build --manifest-path ../../rftrace-frontend-ffi/Cargo.toml --target-dir out
 
 clean:
 	rm -r out

rftrace/build.rs

@@ -30,7 +30,6 @@ fn build_backend() {
     let target = "x86_64-unknown-none";
 
     let mut cmd = cargo();
-    cmd.arg("+nightly");
     cmd.arg("rustc");
 
     cmd.args(["--target", target]);
@@ -52,11 +51,6 @@ fn build_backend() {
     cmd.stdout(Stdio::inherit());
     cmd.stderr(Stdio::inherit());
 
-    cmd.args([
-        "-Zbuild-std=core",
-        "-Zbuild-std-features=compiler-builtins-mem",
-    ]);
-
     cmd.arg("--release");
 
     cmd.arg("--");

rust-toolchain.toml

@@ -1,8 +1,7 @@
 [toolchain]
-channel = "nightly"
 components = [
-    "rust-src",
     "llvm-tools-preview",
     "rustfmt",
     "clippy",
 ]
+targets = ["x86_64-unknown-none"]