| // Copyright 2016 Kyle Mayes |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| //! Finds `libclang` static or dynamic libraries and links to them. |
| //! |
| //! # Environment Variables |
| //! |
| //! This build script can make use of several environment variables to help it |
| //! find the required static or dynamic libraries. |
| //! |
| //! * `LLVM_CONFIG_PATH` - provides a path to an `llvm-config` executable |
| //! * `LIBCLANG_PATH` - provides a path to a directory containing a `libclang` |
| //! shared library or a path to a specific `libclang` shared library |
| //! * `LIBCLANG_STATIC_PATH` - provides a path to a directory containing LLVM |
| //! and Clang static libraries |
| |
| #![allow(unused_attributes)] |
| |
| extern crate glob; |
| |
| use std::path::Path; |
| |
| #[path = "build/common.rs"] |
| pub mod common; |
| #[path = "build/dynamic.rs"] |
| pub mod dynamic; |
| #[path = "build/static.rs"] |
| pub mod static_; |
| |
| /// Copy the file from the supplied source to the supplied destination. |
| #[cfg(feature = "runtime")] |
| fn copy(source: &str, destination: &Path) { |
| use std::fs::File; |
| use std::io::{Read, Write}; |
| |
| let mut string = String::new(); |
| File::open(source) |
| .unwrap() |
| .read_to_string(&mut string) |
| .unwrap(); |
| File::create(destination) |
| .unwrap() |
| .write_all(string.as_bytes()) |
| .unwrap(); |
| } |
| |
| /// Generates the finding and linking code so that it may be used at runtime. |
| #[cfg(feature = "runtime")] |
| fn main() { |
| use std::env; |
| |
| if cfg!(feature = "static") { |
| panic!("`runtime` and `static` features can't be combined"); |
| } |
| |
| let out = env::var("OUT_DIR").unwrap(); |
| copy("build/common.rs", &Path::new(&out).join("common.rs")); |
| copy("build/dynamic.rs", &Path::new(&out).join("dynamic.rs")); |
| } |
| |
| /// Finds and links to the required libraries. |
| #[cfg(not(feature = "runtime"))] |
| fn main() { |
| if cfg!(feature = "static") { |
| static_::link(); |
| } else { |
| dynamic::link(); |
| } |
| |
| if let Some(output) = common::run_llvm_config(&["--includedir"]) { |
| let directory = Path::new(output.trim_end()); |
| println!("cargo:include={}", directory.display()); |
| } |
| } |