Disable std by default

Author: jakelang

Cargo.toml

@@ -13,7 +13,7 @@ wee_alloc = { version = "0.4.4", optional = true }
 qimalloc = { version = "0.1", optional = true }
 
 [features]
-default = ["std", "wee_alloc"]
+default = ["wee_alloc"]
 std = []
 debug = []
 experimental = []

src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+
 //! ewasm_api is a library used to interface with Ethereum's EEI in [Ewasm](https://github.com/ewasm/design), a set of enhancements to
 //! the Ethereum smart contract platform.
 //! ewasm_api exposes both a set of unsafe "native" functions representing the actual EEI

src/utils.rs

@@ -15,6 +15,7 @@ pub fn unsafe_alloc_buffer(len: usize) -> Vec<u8> {
 mod tests {
     use super::*;
 
+    #[cfg(feature = "std")]
     #[test]
     fn smoke() {
         let ret = unsafe_alloc_buffer(42);