chore: Fix no_std ci test

.github/workflows/ci.yml

@@ -21,6 +21,6 @@ jobs:
     - name: Run std tests
       run: cargo test --verbose --tests
     - name: Run no_std tests
-      run: cargo run --manifest-path tests/no_std/Cargo.toml
+      run: rustup target add x86_64-unknown-none && cd tests/no_std/ && cargo run
     - name: Run feature flags tests
       run: cargo test --tests --features coerce_macro && cargo test --tests --features tracing && cargo test --tests --features log

Cargo.toml

@@ -22,7 +22,8 @@ tracing-test = { version = "0.2", features = ["no-env-filter"] }
 lazy_static = "1"
 
 [workspace]
-members = ["impl", "tests/no_std"]
+members = ["impl"]
+exclude = ["tests/no_std"]
 
 [features]
 default = []

src/lib.rs

@@ -1,4 +1,4 @@
-#![no_std]
+#![cfg_attr(not(test), no_std)]
 #![cfg_attr(docsrs, feature(doc_cfg))]
 #![doc = include_str!("../README.md")]
 

tests/no_std/.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+target = ["x86_64-unknown-none"]

tests/no_std/Cargo.toml

@@ -10,8 +10,9 @@ error_set = { path = "../.." }
 name = "no_std"
 path = "main.rs"
 
+
 [profile.dev]
 panic = "abort"
 
 [profile.release]
-panic = "abort"
+panic = "abort"

tests/no_std/main.rs

@@ -1,9 +1,29 @@
 #![no_std]
+#![no_main]
 
 use error_set::{error_set, CoerceResult};
 
-fn main() {
+#[no_mangle]
+pub extern "C" fn _start() -> ! {
     readme_example();
+    exit(0);
+}
+
+fn exit(code: i32) -> ! {
+    unsafe {
+        core::arch::asm!(
+            "mov rax, 60",  // Syscall number for exit
+            "mov rdi, {0}", // Exit code
+            "syscall",      // Trigger the syscall
+            in(reg) code,
+            options(noreturn)
+        );
+    }
+}
+
+#[panic_handler]
+fn panic(_info: &core::panic::PanicInfo) -> ! {
+    exit(1);
 }
 
 //************************************************************************//
@@ -40,7 +60,7 @@ error_set! {
     };
 }
 
-struct TestError(u32);
+pub struct TestError(u32);
 
 impl TestError {
     pub fn new(code: u32) -> Self {