fix(codspeed): fallback to noop when build fails

Author: not-matthias

crates/codspeed/build.rs

@@ -1,13 +1,10 @@
 fn main() {
+    println!("cargo:rustc-check-cfg=cfg(use_instrument_hooks)");
+
     println!("cargo:rerun-if-changed=instrument-hooks/dist/core.c");
     println!("cargo:rerun-if-changed=instrument-hooks/includes/core.h");
     println!("cargo:rerun-if-changed=build.rs");
 
-    if cfg!(not(target_os = "linux")) {
-        // The instrument-hooks library is only supported on Linux.
-        return;
-    }
-
     let mut build = cc::Build::new();
     build
         .flag("-std=c11")
@@ -18,13 +15,17 @@ fn main() {
         .cargo_warnings(false);
 
     let result = build.try_compile("instrument_hooks");
-    if let Err(e) = result {
-        let compiler = build.try_get_compiler().expect("Failed to get C compiler");
+    match result {
+        Ok(_) => println!("cargo:rustc-cfg=use_instrument_hooks"),
+        Err(e) => {
+            let compiler = build.try_get_compiler().expect("Failed to get C compiler");
 
-        eprintln!("\n\nERROR: Failed to compile instrument-hooks native library with cc-rs. Ensure you have an up-to-date C compiler installed.");
-        eprintln!("Compiler information: {compiler:?}");
-        eprintln!("Compilation error: {e}");
+            eprintln!("\n\nWARNING: Failed to compile instrument-hooks native library with cc-rs.");
+            eprintln!("The library will still compile, but instrument-hooks functionality will be disabled.");
+            eprintln!("Compiler information: {compiler:?}");
+            eprintln!("Compilation error: {e}\n");
 
-        std::process::exit(1);
+            println!("cargo:warning=Failed to compile instrument-hooks native library with cc-rs. Continuing with noop implementation.");
+        }
     }
 }

crates/codspeed/src/instrument_hooks/mod.rs

@@ -1,7 +1,7 @@
-#[cfg(target_os = "linux")]
+#[cfg(use_instrument_hooks)]
 mod ffi;
 
-#[cfg(target_os = "linux")]
+#[cfg(use_instrument_hooks)]
 mod linux_impl {
     use nix::sys::time::TimeValLike;
 
@@ -131,7 +131,7 @@ mod linux_impl {
     }
 }
 
-#[cfg(not(target_os = "linux"))]
+#[cfg(not(use_instrument_hooks))]
 mod other_impl {
     pub struct InstrumentHooks;
 
@@ -169,10 +169,10 @@ mod other_impl {
     }
 }
 
-#[cfg(target_os = "linux")]
+#[cfg(use_instrument_hooks)]
 pub use linux_impl::InstrumentHooks;
 
-#[cfg(not(target_os = "linux"))]
+#[cfg(not(use_instrument_hooks))]
 pub use other_impl::InstrumentHooks;
 
 #[cfg(test)]