add more lints

Author: nyurik

Cargo.toml

@@ -158,3 +158,27 @@ missing_safety_doc = "allow"  # safety? in libc? seriously?
 # FIXME(clippy): all these should probably be fixed
 non_minimal_cfg = "allow"  # for some reason cfg_if! sometimes trigger this
 unnecessary_cast = "allow"  # some casts like `as usize` are only needed for some targets
+
+# Enable pedantic lints - use this manually once in a while, but don't enable by default
+# pedantic = { level = "warn", priority = -1 }
+
+# These were manually fixed already, and should be enforced
+explicit_iter_loop = "warn"
+manual_assert = "warn"
+map_unwrap_or = "warn"
+ptr_as_ptr = "warn"
+unnecessary_semicolon = "warn"
+
+# FIXME(clippy): these should eventually be fixed, or listed as OK
+cast_possible_truncation = "allow"
+cast_possible_wrap = "allow"
+cast_sign_loss = "allow"
+expl_impl_clone_on_copy = "allow"
+must_use_candidate = "allow"
+pub_underscore_fields = "allow"
+struct_field_names = "allow"
+uninlined_format_args = "allow"
+unreadable_literal = "allow"
+used_underscore_binding = "allow"
+used_underscore_items = "allow"
+verbose_bit_mask = "allow"

build.rs

@@ -160,12 +160,11 @@ fn rustc_version_cmd(is_clippy_driver: bool) -> Output {
 
     let output = cmd.output().expect("Failed to get rustc version");
 
-    if !output.status.success() {
-        panic!(
-            "failed to run rustc: {}",
-            String::from_utf8_lossy(output.stderr.as_slice())
-        );
-    }
+    assert!(
+        output.status.success(),
+        "failed to run rustc: {}",
+        String::from_utf8_lossy(output.stderr.as_slice())
+    );
 
     output
 }
@@ -192,9 +191,11 @@ fn rustc_minor_nightly() -> (u32, bool) {
 
     let mut pieces = version.split('.');
 
-    if pieces.next() != Some("rustc 1") {
-        panic!("Failed to get rustc version");
-    }
+    assert_eq!(
+        pieces.next(),
+        Some("rustc 1"),
+        "Failed to get rustc version"
+    );
 
     let minor = pieces.next();
 
@@ -204,9 +205,9 @@ fn rustc_minor_nightly() -> (u32, bool) {
     // since a nightly build should either come from CI
     // or a git checkout
     let nightly_raw = otry!(pieces.next()).split('-').nth(1);
-    let nightly = nightly_raw
-        .map(|raw| raw.starts_with("dev") || raw.starts_with("nightly"))
-        .unwrap_or(false);
+    let nightly = nightly_raw.map_or(false, |raw| {
+        raw.starts_with("dev") || raw.starts_with("nightly")
+    });
     let minor = otry!(otry!(minor).parse().ok());
 
     (minor, nightly)
@@ -251,8 +252,9 @@ fn emcc_version_code() -> Option<u64> {
 }
 
 fn set_cfg(cfg: &str) {
-    if !ALLOWED_CFGS.contains(&cfg) {
-        panic!("trying to set cfg {}, but it is not in ALLOWED_CFGS", cfg);
-    }
-    println!("cargo:rustc-cfg={}", cfg);
+    assert!(
+        ALLOWED_CFGS.contains(&cfg),
+        "trying to set cfg {cfg}, but it is not in ALLOWED_CFGS",
+    );
+    println!("cargo:rustc-cfg={cfg}");
 }

src/unix/linux_like/linux/gnu/mod.rs

@@ -425,7 +425,7 @@ impl siginfo_t {
             _si_code: c_int,
             si_addr: *mut c_void,
         }
-        (*(self as *const siginfo_t as *const siginfo_sigfault)).si_addr
+        (*(self as *const siginfo_t).cast::<siginfo_sigfault>()).si_addr
     }
 
     pub unsafe fn si_value(&self) -> crate::sigval {
@@ -438,7 +438,7 @@ impl siginfo_t {
             _si_overrun: c_int,
             si_sigval: crate::sigval,
         }
-        (*(self as *const siginfo_t as *const siginfo_timer)).si_sigval
+        (*(self as *const siginfo_t).cast::<siginfo_timer>()).si_sigval
     }
 }
 
@@ -502,7 +502,7 @@ struct siginfo_f {
 
 impl siginfo_t {
     unsafe fn sifields(&self) -> &sifields {
-        &(*(self as *const siginfo_t as *const siginfo_f)).sifields
+        &(*(self as *const siginfo_t).cast::<siginfo_f>()).sifields
     }
 
     pub unsafe fn si_pid(&self) -> crate::pid_t {

src/unix/linux_like/linux/mod.rs

@@ -5977,7 +5977,7 @@ f! {
     pub fn CMSG_NXTHDR(mhdr: *const msghdr, cmsg: *const cmsghdr) -> *mut cmsghdr {
         if ((*cmsg).cmsg_len as usize) < size_of::<cmsghdr>() {
             return core::ptr::null_mut::<cmsghdr>();
-        };
+        }
         let next = (cmsg as usize + super::CMSG_ALIGN((*cmsg).cmsg_len as usize)) as *mut cmsghdr;
         let max = (*mhdr).msg_control as usize + (*mhdr).msg_controllen as usize;
         if (next.wrapping_offset(1)) as usize > max
@@ -5996,7 +5996,7 @@ f! {
     }
 
     pub fn CPU_ZERO(cpuset: &mut cpu_set_t) -> () {
-        for slot in cpuset.bits.iter_mut() {
+        for slot in &mut cpuset.bits {
             *slot = 0;
         }
     }
@@ -6022,7 +6022,7 @@ f! {
     pub fn CPU_COUNT_S(size: usize, cpuset: &cpu_set_t) -> c_int {
         let mut s: u32 = 0;
         let size_of_mask = mem::size_of_val(&cpuset.bits[0]);
-        for i in cpuset.bits[..(size / size_of_mask)].iter() {
+        for i in &cpuset.bits[..(size / size_of_mask)] {
             s += i.count_ones();
         }
         s as c_int

src/unix/linux_like/mod.rs

@@ -1706,7 +1706,7 @@ const_fn! {
 f! {
     pub fn CMSG_FIRSTHDR(mhdr: *const msghdr) -> *mut cmsghdr {
         if (*mhdr).msg_controllen as usize >= mem::size_of::<cmsghdr>() {
-            (*mhdr).msg_control as *mut cmsghdr
+            (*mhdr).msg_control.cast::<cmsghdr>()
         } else {
             core::ptr::null_mut::<cmsghdr>()
         }
@@ -1745,7 +1745,7 @@ f! {
     }
 
     pub fn FD_ZERO(set: *mut fd_set) -> () {
-        for slot in (*set).fds_bits.iter_mut() {
+        for slot in &mut (*set).fds_bits {
             *slot = 0;
         }
     }