Rename llvm_stable feature and remove references from docs.

.travis.yml

@@ -15,7 +15,7 @@ rust:
   - stable
 
 env:
-  - CARGO_TARGET_DIR=/tmp/bindgen LLVM_VERSION=3.8 BINDGEN_FEATURES=llvm_stable
+  - CARGO_TARGET_DIR=/tmp/bindgen LLVM_VERSION=3.8 BINDGEN_FEATURES=__testing_only_llvm_stable
   - CARGO_TARGET_DIR=/tmp/bindgen LLVM_VERSION=3.9 BINDGEN_FEATURES=
 
 cache:

CONTRIBUTING.md

@@ -69,7 +69,7 @@ that you aren't forgetting to document types and functions. CI will catch it if
 you forget, but the turn around will be a lot slower ;)
 
 ```
-$ cargo build --features "llvm_stable _docs"
+$ cargo build --features docs_
 ```
 
 ## Testing
@@ -90,7 +90,7 @@ Run `cargo test` to compare generated Rust bindings to the expectations.
 ### Running All Tests
 
 ```
-$ cargo test [--features llvm_stable]
+$ cargo test [--all-features]
 ```
 
 ### Authoring New Tests

Cargo.toml

@@ -66,7 +66,7 @@ version = "0.29"
 [features]
 assert_no_dangling_items = []
 default = ["logging"]
-llvm_stable = []
+__testing_only_llvm_stable = []
 logging = ["env_logger", "log"]
 static = []
 # This feature only exists for CI -- don't use it!

bindgen-integration/Cargo.toml

@@ -11,4 +11,4 @@ bindgen = { path = ".." }
 gcc = "0.3"
 
 [features]
-llvm_stable = ["bindgen/llvm_stable"]
+__testing_only_llvm_stable = ["bindgen/__testing_only_llvm_stable"]

src/main.rs

@@ -25,7 +25,7 @@ pub fn main() {
     let bind_args: Vec<_> = env::args().collect();
 
     let version = clang_version();
-    let expected_version = if cfg!(feature = "llvm_stable") {
+    let expected_version = if cfg!(feature = "__testing_only_llvm_stable") {
         (3, 8)
     } else {
         (3, 9)

tests/tests.rs

@@ -84,7 +84,7 @@ fn create_bindgen_builder(header: &PathBuf) -> Result<Option<Builder>, Error> {
                 .unwrap();
             flags.extend(extra_flags.into_iter());
         } else if line.contains("bindgen-unstable") &&
-                  cfg!(feature = "llvm_stable") {
+                  cfg!(feature = "__testing_only_llvm_stable") {
             return Ok(None);
         } else if line.contains("bindgen-osx-only") {
             let prepend_flags = ["--raw-line", "#![cfg(target_os=\"macos\")]"];