Chih-Hung Hsieh | fab4380 | 2020-04-07 14:24:01 -0700 | [diff] [blame] | 1 | // Copyright 2016 Kyle Mayes |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | //! Finds `libclang` static or dynamic libraries and links to them. |
| 16 | //! |
| 17 | //! # Environment Variables |
| 18 | //! |
| 19 | //! This build script can make use of several environment variables to help it |
| 20 | //! find the required static or dynamic libraries. |
| 21 | //! |
| 22 | //! * `LLVM_CONFIG_PATH` - provides a path to an `llvm-config` executable |
| 23 | //! * `LIBCLANG_PATH` - provides a path to a directory containing a `libclang` |
| 24 | //! shared library or a path to a specific `libclang` shared library |
| 25 | //! * `LIBCLANG_STATIC_PATH` - provides a path to a directory containing LLVM |
| 26 | //! and Clang static libraries |
| 27 | |
| 28 | #![allow(unused_attributes)] |
| 29 | |
| 30 | extern crate glob; |
| 31 | |
| 32 | use std::path::Path; |
| 33 | |
| 34 | #[path = "build/common.rs"] |
| 35 | pub mod common; |
| 36 | #[path = "build/dynamic.rs"] |
| 37 | pub mod dynamic; |
| 38 | #[path = "build/static.rs"] |
| 39 | pub mod static_; |
| 40 | |
| 41 | /// Copy the file from the supplied source to the supplied destination. |
| 42 | #[cfg(feature = "runtime")] |
| 43 | fn copy(source: &str, destination: &Path) { |
| 44 | use std::fs::File; |
| 45 | use std::io::{Read, Write}; |
| 46 | |
| 47 | let mut string = String::new(); |
| 48 | File::open(source) |
| 49 | .unwrap() |
| 50 | .read_to_string(&mut string) |
| 51 | .unwrap(); |
| 52 | File::create(destination) |
| 53 | .unwrap() |
| 54 | .write_all(string.as_bytes()) |
| 55 | .unwrap(); |
| 56 | } |
| 57 | |
| 58 | /// Generates the finding and linking code so that it may be used at runtime. |
| 59 | #[cfg(feature = "runtime")] |
| 60 | fn main() { |
| 61 | use std::env; |
| 62 | |
| 63 | if cfg!(feature = "static") { |
| 64 | panic!("`runtime` and `static` features can't be combined"); |
| 65 | } |
| 66 | |
| 67 | let out = env::var("OUT_DIR").unwrap(); |
| 68 | copy("build/common.rs", &Path::new(&out).join("common.rs")); |
| 69 | copy("build/dynamic.rs", &Path::new(&out).join("dynamic.rs")); |
| 70 | } |
| 71 | |
| 72 | /// Finds and links to the required libraries. |
| 73 | #[cfg(not(feature = "runtime"))] |
| 74 | fn main() { |
| 75 | if cfg!(feature = "static") { |
| 76 | static_::link(); |
| 77 | } else { |
| 78 | dynamic::link(); |
| 79 | } |
| 80 | |
| 81 | if let Some(output) = common::run_llvm_config(&["--includedir"]) { |
| 82 | let directory = Path::new(output.trim_end()); |
| 83 | println!("cargo:include={}", directory.display()); |
| 84 | } |
| 85 | } |