Fix feature gates

build.rs

@@ -4,7 +4,12 @@ fn main() {
     println!("cargo:rerun-if-changed=wrapper.h");
     println!("cargo:rerun-if-changed=lzokay/lzokay.cpp");
     println!("cargo:rerun-if-changed=lzokay/lzokay.hpp");
-    cc::Build::new().cpp(true).file("lzokay/lzokay.cpp").compile("lzokay");
+    cc::Build::new()
+        .cpp(true)
+        .file("lzokay/lzokay.cpp")
+        .flag_if_supported("-std=c++14") // GCC/Clang
+        .flag_if_supported("/std:c++14") // MSVC
+        .compile("lzokay");
     #[allow(unused_mut)]
     let mut bindings = bindgen::Builder::default()
         .header("wrapper.hpp")

src/compress.rs

@@ -11,8 +11,10 @@
 //! use lzokay::compress::*;
 //! # #[allow(non_upper_case_globals)] const input: [u8; 512] = [0u8; 512];
 //!
+//! # #[cfg(feature = "alloc")] {
 //! let dst: Vec<u8> = compress(&input)?;
 //! # assert_eq!(dst.len(), 10);
+//! # }
 //! # Ok::<(), lzokay::Error>(())
 //! ```
 //!
@@ -22,11 +24,13 @@
 //! # #[allow(non_upper_case_globals)] const input1: [u8; 512] = [0u8; 512];
 //! # #[allow(non_upper_case_globals)] const input2: [u8; 512] = [0u8; 512];
 //!
+//! # #[cfg(feature = "alloc")] {
 //! let mut dict = new_dict();
 //! let dst1 = compress_with_dict(&input1, &mut dict)?;
 //! let dst2 = compress_with_dict(&input2, &mut dict)?;
 //! # assert_eq!(dst1.len(), 10);
 //! # assert_eq!(dst2.len(), 10);
+//! # }
 //! # Ok::<(), lzokay::Error>(())
 //! ```
 //!
@@ -55,7 +59,9 @@ use alloc::{
     boxed::Box,
     vec::Vec,
 };
-use core::{marker::PhantomData, mem::size_of, ptr::null_mut};
+#[cfg(feature = "alloc")]
+use core::ptr::null_mut;
+use core::{marker::PhantomData, mem::size_of};
 
 use crate::{bindings, lzokay_result, Error};
 
@@ -98,6 +104,7 @@ pub fn dict_from_storage(storage: &mut [u8]) -> Dict {
     }
     Dict {
         base: bindings::lzokay_DictBase { _storage: storage.as_mut_ptr() as *mut DictStorage },
+        #[cfg(feature = "alloc")]
         storage: Option::None,
         phantom: PhantomData,
     }

src/lib.rs

@@ -103,20 +103,17 @@ fn lzokay_result<T>(result: T, error: bindings::lzokay_EResult) -> Result<T, Err
 }
 
 #[cfg(test)]
+#[cfg(all(feature = "compress", feature = "decompress", feature = "alloc"))]
 mod tests {
-    #[cfg(all(not(feature = "std"), feature = "alloc"))]
+    #[cfg(not(feature = "std"))]
     extern crate alloc;
 
-    #[cfg(all(not(feature = "std"), feature = "alloc"))]
-    use alloc::vec::Vec;
+    #[cfg(not(feature = "std"))]
+    use alloc::vec;
 
-    #[cfg(all(feature = "compress", feature = "alloc"))]
-    use super::compress::compress;
-    #[cfg(feature = "decompress")]
-    use super::decompress::decompress;
+    use super::{compress::compress, decompress::decompress};
 
     #[test]
-    #[cfg(all(feature = "compress", feature = "decompress", feature = "alloc"))]
     fn test_round_trip() {
         let src = include_bytes!("test1.txt");
         let compressed = compress(src).expect("Failed to compress");