Add no_std and alloc checks to CI

Author: wojciech-graj

.github/workflows/ci.yml

@@ -62,3 +62,29 @@ jobs:
         run: |
           cargo +nightly generate-lockfile -Z minimal-versions
           cd bin-proto && cargo msrv verify
+
+  no_std:
+    name: Check no_std
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: x86_64-unknown-none
+      - uses: Swatinem/rust-cache@v2
+      - name: Run Check
+        run: cargo b --package tests --target x86_64-unknown-none
+        working-directory: tests
+
+  alloc:
+    name: Check alloc
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: x86_64-unknown-none
+      - uses: Swatinem/rust-cache@v2
+      - name: Run Check
+        run: cargo b --package tests --target x86_64-unknown-none --features alloc
+        working-directory: tests

bin-proto/src/codec.rs

@@ -268,7 +268,7 @@ macro_rules! test_codec {
 
 macro_rules! test_roundtrip {
     ($ty:ty) => {
-        #[cfg(all(test, feature = "alloc"))]
+        #[cfg(all(test, feature = "std"))]
         ::proptest::proptest!(
             #[test]
             fn roundtrip(x in ::proptest::arbitrary::any::<$ty>()) {

tests/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "tests"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[features]
+alloc = ["bin-proto/alloc"]
+
+[dependencies]
+bin-proto = { path = "../bin-proto", default-features = false, features = ["derive", "prepend-tags"] }

tests/src/main.rs

@@ -0,0 +1,32 @@
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+extern crate bin_proto;
+
+#[no_mangle]
+fn main() {}
+
+#[panic_handler]
+fn panic(_: &PanicInfo) -> ! {
+    loop {}
+}
+
+#[cfg(feature = "alloc")]
+struct Allocator;
+
+#[cfg(feature = "alloc")]
+unsafe impl core::alloc::GlobalAlloc for Allocator {
+    unsafe fn alloc(&self, _: core::alloc::Layout) -> *mut u8 {
+        unimplemented!()
+    }
+
+    unsafe fn dealloc(&self, _: *mut u8, _: core::alloc::Layout) {
+        unimplemented!()
+    }
+}
+
+#[cfg(feature = "alloc")]
+#[global_allocator]
+static GLOBAL: Allocator = Allocator;