Get rid of static_assertions dependency

Author: SpriteOvO

spdlog/Cargo.toml

@@ -50,7 +50,6 @@ log = { version = "0.4.8", optional = true }
 once_cell = "1.16.0"
 spdlog-macros = { version = "0.1.0", path = "../spdlog-macros" }
 spin = "0.9.8"
-static_assertions = "1.1.0"
 thiserror = "1.0.37"
 
 [target.'cfg(windows)'.dependencies]

spdlog/src/error.rs

@@ -6,10 +6,10 @@ use std::{
 };
 
 use atomic::Atomic;
-use static_assertions::const_assert;
 use thiserror::Error;
 
 pub use crate::env_level::EnvLevelError;
+use crate::utils::const_assert;
 #[cfg(feature = "multi-thread")]
 use crate::{sink::Task, RecordOwned};
 

spdlog/src/level.rs

@@ -72,7 +72,7 @@ pub enum Level {
 
 cfg_if! {
     if #[cfg(test)] {
-        static_assertions::const_assert!(atomic::Atomic::<Level>::is_lock_free());
+        crate::utils::const_assert!(atomic::Atomic::<Level>::is_lock_free());
     }
 }
 
@@ -224,15 +224,12 @@ pub enum LevelFilter {
 
 cfg_if! {
     if #[cfg(test)] {
-        static_assertions::const_assert!(atomic::Atomic::<LevelFilter>::is_lock_free());
-        static_assertions::const_assert_eq!(
-            std::mem::size_of::<Level>() * 2,
-            std::mem::size_of::<LevelFilter>()
-        );
-        static_assertions::const_assert_eq!(
-            std::mem::align_of::<Level>() * 2,
-            std::mem::align_of::<LevelFilter>()
-        );
+        use std::mem::{align_of, size_of};
+        use crate::utils::const_assert;
+
+        const_assert!(atomic::Atomic::<LevelFilter>::is_lock_free());
+        const_assert!(size_of::<Level>() * 2 == size_of::<LevelFilter>());
+        const_assert!(align_of::<Level>() * 2 == align_of::<LevelFilter>());
     }
 }
 

spdlog/src/sink/helper.rs

@@ -11,8 +11,7 @@ pub(crate) type SinkErrorHandler = Atomic<Option<ErrorHandler>>;
 
 cfg_if! {
     if #[cfg(test)] {
-        use static_assertions::const_assert;
-        const_assert!(Atomic::<SinkErrorHandler>::is_lock_free());
+        crate::utils::const_assert!(Atomic::<SinkErrorHandler>::is_lock_free());
     }
 }
 

spdlog/src/utils.rs

@@ -25,3 +25,14 @@ pub fn open_file(path: impl AsRef<Path>, truncate: bool) -> Result<File> {
         .open(path)
         .map_err(Error::OpenFile)
 }
+
+// Credits `static_assertions` crate
+macro_rules! const_assert {
+    ( $cond:expr $(,)? ) => {
+        const _: [(); 0 - !{
+            const EVALUATED: bool = $cond;
+            EVALUATED
+        } as usize] = [];
+    };
+}
+pub(crate) use const_assert;