disable generation of lttng tracepoints if no tracing feature set

Signed-off-by: Fabrizio <fab@pop-os.localdomain>

Cargo.toml

@@ -14,4 +14,4 @@ chrono = "0.4"
 lttng-ust = { version = "0.1.0", optional = true }
 
 [build-dependencies]
-lttng-ust-generate = "0.1.0"
+lttng-ust-generate = "0.1.0"

build.rs

@@ -1,9 +1,11 @@
 use std::env;
 use std::path::PathBuf;
 
+#[cfg(feature = "tracing")]
 use lttng_ust_generate::{Provider, Generator, CTFType, CIntegerType};
 
-fn main() {
+#[cfg(feature = "tracing")]
+fn setup_tracepoints() {
     // the provider is called calendar
     let mut provider = Provider::new("calendar");
 
@@ -22,4 +24,9 @@ fn main() {
         .output_file_name(PathBuf::from(env::var("OUT_DIR").unwrap()).join("tracepoints.rs"))
         .generate()
         .expect("Unable to generate tracepoint bindings");
-}
+}
+
+fn main() {
+    #[cfg(feature = "tracing")]
+    setup_tracepoints();
+}