crypto: Make pprof a Linux specific dependency

matrix_sdk_crypto/Cargo.toml

@@ -52,6 +52,8 @@ http = "0.2.3"
 matrix-sdk-test = { version = "0.2.0", path = "../matrix_sdk_test" }
 indoc = "1.0.3"
 criterion = { version = "0.3.4", features = ["async", "async_futures", "html_reports"] }
+
+[target.'cfg(target_os = "linux")'.dev-dependencies]
 pprof = { version = "0.4.2", features = ["flamegraph"] }
 
 [[bench]]

matrix_sdk_crypto/benches/crypto_bench.rs

@@ -1,3 +1,4 @@
+#[cfg(target_os = "linux")]
 mod perf;
 
 use std::convert::TryFrom;
@@ -101,7 +102,12 @@ pub fn keys_claiming(c: &mut Criterion) {
 }
 
 fn criterion() -> Criterion {
-    Criterion::default().with_profiler(perf::FlamegraphProfiler::new(100))
+    #[cfg(target_os = "linux")]
+    let criterion = Criterion::default().with_profiler(perf::FlamegraphProfiler::new(100));
+    #[cfg(not(target_os = "linux"))]
+    let criterion = Criterion::default();
+
+    criterion
 }
 
 criterion_group! {