From eaec0856625da0a163e7f4e0e226335ace1f9b2e Mon Sep 17 00:00:00 2001
From: Pierre Krieger <pierre.krieger1708@gmail.com>
Date: Thu, 15 Mar 2018 09:41:01 +0100
Subject: [PATCH] Don't use libc with wasm32-unknown-unknown (#27)

---
 Cargo.toml  | 4 +++-
 src/hash.rs | 6 +++---
 src/lib.rs  | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 722dd5f..0e19b1c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,11 +8,13 @@ description = "Fixed-size hashes"
 
 [dependencies]
 heapsize = { version = "0.4", optional = true }
-libc = { version = "0.2", optional = true, default-features = false }
 rand = { version = "0.4", optional = true }
 rustc-hex = { version = "1.0", optional = true }
 quickcheck = { version = "0.6", optional = true }
 
+[target.'cfg(not(target_os = "unknown"))'.dependencies]
+libc = { version = "0.2", optional = true, default-features = false }
+
 [features]
 default = ["libc"]
 std = ["rustc-hex", "rand"]
diff --git a/src/hash.rs b/src/hash.rs
index f02c59d..b5a0dfa 100644
--- a/src/hash.rs
+++ b/src/hash.rs
@@ -418,7 +418,7 @@ macro_rules! impl_std_for_hash_internals {
 	($from: ident, $size: tt) => {}
 }
 
-#[cfg(feature="libc")]
+#[cfg(all(feature="libc", not(target_os = "unknown")))]
 #[macro_export]
 #[doc(hidden)]
 macro_rules! impl_heapsize_for_hash {
@@ -431,7 +431,7 @@ macro_rules! impl_heapsize_for_hash {
 	}
 }
 
-#[cfg(feature="libc")]
+#[cfg(all(feature="libc", not(target_os = "unknown")))]
 #[macro_export]
 #[doc(hidden)]
 macro_rules! impl_libc_for_hash {
@@ -453,7 +453,7 @@ macro_rules! impl_libc_for_hash {
 	}
 }
 
-#[cfg(not(feature="libc"))]
+#[cfg(any(not(feature="libc"), target_os = "unknown"))]
 #[macro_export]
 #[doc(hidden)]
 macro_rules! impl_libc_for_hash {
diff --git a/src/lib.rs b/src/lib.rs
index 77d9f0d..50d5892 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,7 +8,7 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
-#[cfg(feature="libc")]
+#[cfg(all(feature="libc", not(target_os = "unknown")))]
 #[doc(hidden)]
 pub extern crate libc;