5 files changed, 14 insertions, 11 deletions
diff --git a/rand/rand_chacha/CHANGELOG.md b/rand/rand_chacha/CHANGELOG.md
index d0c4a2f..a1979f6 100644
--- a/rand/rand_chacha/CHANGELOG.md
+++ b/rand/rand_chacha/CHANGELOG.md
@@ -4,5 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.1.1] - 2019-01-04
+- Disable `i128` and `u128` if the `target_os` is `emscripten` (#671: work-around Emscripten limitation)
+- Update readme and doc links
+
 ## [0.1.0] - 2018-10-17
 - Pulled out of the Rand crate
diff --git a/rand/rand_chacha/Cargo.toml b/rand/rand_chacha/Cargo.toml
index af70969..028428c 100644
--- a/rand/rand_chacha/Cargo.toml
+++ b/rand/rand_chacha/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rand_chacha"
-version = "0.1.0"
+version = "0.1.1"
 authors = ["The Rand Project Developers", "The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 readme = "README.md"
@@ -22,4 +22,4 @@ appveyor = { repository = "rust-random/rand" }
 rand_core = { path = "../rand_core", version = ">=0.2, <0.4", default-features=false }
 
 [build-dependencies]
-rustc_version = "0.2"
+autocfg = "0.1"
diff --git a/rand/rand_chacha/build.rs b/rand/rand_chacha/build.rs
index cb3ae20..06e12a4 100644
--- a/rand/rand_chacha/build.rs
+++ b/rand/rand_chacha/build.rs
@@ -1,8 +1,7 @@
-extern crate rustc_version;
-use rustc_version::{version, Version};
+extern crate autocfg;
 
 fn main() {
-    if version().unwrap() >= Version::parse("1.26.0").unwrap() {
-        println!("cargo:rustc-cfg=rust_1_26");
-    }
+    println!("cargo:rerun-if-changed=build.rs");
+    let ac = autocfg::new();
+    ac.emit_rustc_version(1, 26);
 }
diff --git a/rand/rand_chacha/src/chacha.rs b/rand/rand_chacha/src/chacha.rs
index 3e90409..86f191e 100644
--- a/rand/rand_chacha/src/chacha.rs
+++ b/rand/rand_chacha/src/chacha.rs
@@ -114,7 +114,7 @@ impl ChaChaRng {
     /// byte-offset.
     ///
     /// Note: this function is currently only available with Rust 1.26 or later.
-    #[cfg(rust_1_26)]
+    #[cfg(all(rustc_1_26, not(target_os = "emscripten")))]
     pub fn get_word_pos(&self) -> u128 {
         let mut c = (self.0.core.state[13] as u64) << 32
                   | (self.0.core.state[12] as u64);
@@ -135,7 +135,7 @@ impl ChaChaRng {
     /// 60 bits.
     ///
     /// Note: this function is currently only available with Rust 1.26 or later.
-    #[cfg(rust_1_26)]
+    #[cfg(all(rustc_1_26, not(target_os = "emscripten")))]
     pub fn set_word_pos(&mut self, word_offset: u128) {
         let index = (word_offset as usize) & 0xF;
         let counter = (word_offset >> 4) as u64;
@@ -330,7 +330,7 @@ mod test {
     }
 
     #[test]
-    #[cfg(rust_1_26)]
+    #[cfg(all(rustc_1_26, not(target_os = "emscripten")))]
     fn test_chacha_true_values_c() {
         // Test vector 4 from
         // https://tools.ietf.org/html/draft-nir-cfrg-chacha20-poly1305-04
diff --git a/rand/rand_chacha/src/lib.rs b/rand/rand_chacha/src/lib.rs
index 8cff03a..74ad466 100644
--- a/rand/rand_chacha/src/lib.rs
+++ b/rand/rand_chacha/src/lib.rs
@@ -18,7 +18,7 @@
 
 #![no_std]
 
-extern crate rand_core;
+pub extern crate rand_core;
 
 mod chacha;