libcoap-sys/build.rs:18:5:w:warning: unused import: `std::collections::HashMap`
  --> libcoap-sys/build.rs:18:5
   |
18 | use std::collections::HashMap;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default


__END__

libcoap-sys/build.rs:19:16:w:warning: unused imports: `CStr`, `CString`
  --> libcoap-sys/build.rs:19:16
   |
19 | use std::ffi::{CStr, CString};
   |                ^^^^  ^^^^^^^


__END__

libcoap-sys/build.rs:20:23:w:warning: unused import: `Formatter`
  --> libcoap-sys/build.rs:20:23
   |
20 | use std::fmt::{Debug, Formatter};
   |                       ^^^^^^^^^


__END__

libcoap-sys/build.rs:89:5:w:warning: unnecessary `unsafe` block
  --> libcoap-sys/build.rs:89:5
   |
89 |     unsafe { env::set_var("PATH", embuild_env) };
   |     ^^^^^^ unnecessary `unsafe` block
   |
   = note: `#[warn(unused_unsafe)]` on by default


__END__

libcoap-sys/build.rs:445:9:w:warning: unnecessary `unsafe` block
   --> libcoap-sys/build.rs:445:9
    |
445 |         unsafe {
    |         ^^^^^^ unnecessary `unsafe` block


__END__

libcoap-sys/build.rs:592:5:w:warning: unnecessary `unsafe` block
   --> libcoap-sys/build.rs:592:5
    |
592 |     unsafe {
    |     ^^^^^^ unnecessary `unsafe` block


__END__

libcoap-sys/build.rs:38:9:w:warning: you seem to be trying to use `match` for an equality check. Consider using `if`
  --> libcoap-sys/build.rs:38:9
   |
38 | /         match name {
39 | |             "PACKAGE_VERSION" => {
40 | |                 let version_str = String::from_utf8_lossy(value);
41 | |                 println!("cargo:rustc-cfg=libcoap_version=\"{}\"", version_str.as_ref());
...  |
49 | |             _ => {},
50 | |         }
   | |_________^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
   = note: `#[warn(clippy::single_match)]` on by default
help: try
   |
38 ~         if name == "PACKAGE_VERSION" {
39 +             let version_str = String::from_utf8_lossy(value);
40 +             println!("cargo:rustc-cfg=libcoap_version=\"{}\"", version_str.as_ref());
41 +             let version = Version::from(version_str.as_ref()).unwrap();
42 +             match version.compare(Version::from("4.3.4").unwrap()) {
43 +                 Cmp::Lt | Cmp::Eq => println!("cargo:rustc-cfg=inlined_coap_send_rst"),
44 +                 _ => {},
45 +             }
46 +             self.version.replace(version.to_string());
47 +         }
   |


__END__

libcoap-sys/build.rs:451:65:w:warning: use of `unwrap_or_else` to construct default value
   --> libcoap-sys/build.rs:451:65
    |
451 |                     orig_pkg_config.as_ref().map(String::clone).unwrap_or_else(String::new)
    |                                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `unwrap_or_default()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unwrap_or_default
    = note: `#[warn(clippy::unwrap_or_default)]` on by default


__END__

libcoap-sys/build.rs:451:21:w:warning: this call to `as_ref.map(...)` does nothing
   --> libcoap-sys/build.rs:451:21
    |
451 |                     orig_pkg_config.as_ref().map(String::clone).unwrap_or_else(String::new)
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `orig_pkg_config.clone()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
    = note: `#[warn(clippy::useless_asref)]` on by default


__END__

libcoap-sys/build.rs:486:28:w:warning: redundant pattern matching, consider using `is_some()`
   --> libcoap-sys/build.rs:486:28
    |
486 |                     if let Some(_) = env::var_os("DEP_MBEDTLS_INCLUDE") {
    |                     -------^^^^^^^------------------------------------- help: try: `if env::var_os("DEP_MBEDTLS_INCLUDE").is_some()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
    = note: `#[warn(clippy::redundant_pattern_matching)]` on by default


__END__