refactor: replace cfg_if with cfg_select (#925)

Author: abh1nav10

Cargo.toml

@@ -47,7 +47,6 @@ async-io = "2.6.0"
 bytes = "1.7.1"
 bytemuck = "1.25.0"
 cfg_aliases = "0.2.1"
-cfg-if = "1.0.0"
 compio-send-wrapper = "0.7.1"
 criterion = "0.8.0"
 crossbeam-queue = "0.3.8"

compio-compat/Cargo.toml

@@ -13,7 +13,6 @@ repository = { workspace = true }
 compio-runtime = { workspace = true }
 compio-log = { workspace = true }
 
-cfg-if = { workspace = true }
 mod_use = { workspace = true }
 
 [target.'cfg(windows)'.dependencies]

compio-compat/src/sys/mod.rs

@@ -3,12 +3,14 @@ use std::{io, ops::Deref, time::Duration};
 use compio_runtime::Runtime;
 use mod_use::mod_use;
 
-cfg_if::cfg_if! {
-    if #[cfg(windows)] {
+cfg_select! {
+    windows => {
         mod_use![windows];
-    } else if #[cfg(unix)] {
+    }
+    unix => {
         mod_use![unix];
-    } else {
+    }
+    _ => {
         compile_error!("Unsupported platform");
     }
 }

compio-driver/Cargo.toml

@@ -26,7 +26,6 @@ compio-log = { workspace = true }
 compio-send-wrapper = { workspace = true }
 
 # Utils
-cfg-if = { workspace = true }
 flume = { workspace = true, default-features = false }
 futures-util = { workspace = true }
 socket2 = { workspace = true, features = ["all"] }

compio-driver/src/control.rs

@@ -4,14 +4,17 @@ use compio_buf::IntoInner;
 
 use crate::{DriverType, OpCode};
 
-cfg_if::cfg_if! {
-    if #[cfg(fusion)] {
+cfg_select! {
+    fusion => {
         use crate::{PollOpCode, IourOpCode};
-    } else if #[cfg(io_uring)] {
+    }
+    io_uring => {
         use crate::OpCode as IourOpCode;
-    } else if #[cfg(polling)]{
+    }
+    polling => {
         use crate::OpCode as PollOpCode;
     }
+    _ => {}
 }
 
 #[cfg(not(fusion))]

compio-driver/src/fd.rs

@@ -14,10 +14,11 @@ use std::{
 
 use crate::{AsFd, AsRawFd, BorrowedFd, RawFd};
 
-cfg_if::cfg_if! {
-    if #[cfg(feature = "sync")] {
+cfg_select! {
+    feature = "sync" => {
         use synchrony::sync;
-    } else {
+    }
+    _ => {
         use synchrony::unsync as sync;
     }
 }

compio-driver/src/sys/buffer_pool/mod.rs

@@ -2,16 +2,18 @@ use std::{fmt::Debug, io};
 
 use crate::buffer_pool::*;
 
-cfg_if::cfg_if! {
-    if #[cfg(fusion)] {
+cfg_select! {
+    fusion => {
         mod fusion;
         mod iour;
         mod fallback;
         use fusion as imp;
-    } else if #[cfg(io_uring)] {
+    }
+    io_uring => {
         mod iour;
         use iour as imp;
-    } else {
+    }
+    _ => {
         mod fallback;
         use fallback as imp;
     }

compio-driver/src/sys/driver/iocp/cp/mod.rs

@@ -41,11 +41,12 @@ use windows_sys::Win32::{
 
 use crate::{Overlapped, RawFd, syscall};
 
-cfg_if::cfg_if! {
-    if #[cfg(feature = "iocp-global")] {
+cfg_select! {
+    feature = "iocp-global" => {
         mod global;
         pub use global::*;
-    } else {
+    }
+    _ => {
         mod multi;
         pub use multi::*;
     }

compio-driver/src/sys/driver/iocp/wait/mod.rs

@@ -1,8 +1,9 @@
-cfg_if::cfg_if! {
-    if #[cfg(feature = "iocp-wait-packet")] {
+cfg_select! {
+    feature = "iocp-wait-packet" => {
         mod packet;
         use packet as sys;
-    } else {
+    }
+    _ => {
         mod thread_pool;
         use thread_pool as sys;
     }

compio-driver/src/sys/driver/iour/mod.rs

@@ -6,18 +6,20 @@ use crate::sys::{extra::IourExtra, prelude::*};
 
 mod_use![op, notify];
 
-cfg_if! {
-    if #[cfg(feature = "io-uring-cqe32")] {
+cfg_select! {
+    feature = "io-uring-cqe32" => {
         use io_uring::cqueue::Entry32 as CEntry;
-    } else {
+    }
+    _ => {
         use io_uring::cqueue::Entry as CEntry;
     }
 }
 
-cfg_if! {
-    if #[cfg(feature = "io-uring-sqe128")] {
+cfg_select! {
+    feature = "io-uring-sqe128" => {
         use io_uring::squeue::Entry128 as SEntry;
-    } else {
+    }
+    _ => {
         use io_uring::squeue::Entry as SEntry;
     }
 }