use clippy on CI

.travis.yml

@@ -108,6 +108,13 @@ matrix:
       rust: nightly
       before_script: rustup component add rustfmt-preview
       script: cargo fmt --all -- --check
+    - name: "clippy"
+      install: true
+      rust: nightly
+      before_script: rustup component add clippy-preview
+      script:
+        - cargo clippy -p jemalloc-sys -- -D clippy::pedantic
+        - cargo clippy -p jemallocator -- -D clippy::pedantic
     - name: "Shellcheck"
       install: true
       script: shellcheck ci/*.sh

jemalloc-sys/src/lib.rs

@@ -41,6 +41,10 @@
 //! [jemalloc_mallctl]: http://jemalloc.net/jemalloc.3.html#mallctl_namespace
 #![no_std]
 #![allow(non_snake_case, non_camel_case_types)]
+#![cfg_attr(
+    feature = "cargo-clippy",
+    allow(clippy::cast_possible_truncation, clippy::cast_possible_wrap)
+)]
 
 extern crate libc;