d39972da88
Apparently, on RHEL 6.7, pkg-config doesn't let you check versions and output flags in the same command run.
81 lines
3.4 KiB
Rust
81 lines
3.4 KiB
Rust
/*
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* Copyright 2016-2017 Nathan Fiedler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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extern crate bindgen;
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extern crate pkg_config;
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use std::env;
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use std::fs::File;
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use std::io::prelude::*;
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use std::path::{Path, PathBuf};
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const MIN_VERSION: &'static str = "6.9";
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const MAX_VERSION: &'static str = "6.10";
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static HEADER: &'static str = "#include <wand/MagickWand.h>\n";
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fn main() {
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// Assert that the appropriate version of MagickWand is installed,
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// since we are very dependent on the particulars of MagickWand.
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pkg_config::Config::new()
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.atleast_version(MIN_VERSION)
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.arg(format!("--max-version={}", MAX_VERSION))
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.probe("MagickWand")
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.unwrap();
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// We have to split the version check and the cflags/libs check because you can't do both at
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// the same time on RHEL (apparently).
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let library = pkg_config::Config::new().probe("MagickWand").unwrap();
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// If the generated bindings are missing, generate them now.
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let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
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let bindings_path_str = out_dir.join("bindings.rs");
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if !Path::new(&bindings_path_str).exists() {
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// Create the header file that rust-bindgen needs as input.
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let gen_h_path = out_dir.join("gen.h");
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let mut gen_h = File::create(&gen_h_path).expect("could not create file");
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gen_h.write_all(HEADER.as_bytes()).expect("could not write header file");
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// Geneate the bindings.
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let mut builder = bindgen::Builder::default()
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.no_unstable_rust()
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.emit_builtins()
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.ctypes_prefix("libc")
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.raw_line("extern crate libc;")
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.header(gen_h_path.to_str().unwrap());
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for include_path in library.include_paths {
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builder = builder.clang_arg(format!("-I{}", include_path.to_string_lossy()));
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}
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if cfg!(target_os = "freebsd") {
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// pkg_config does not seem to work properly on FreeBSD, so
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// hard-code the builder settings for the time being.
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builder = builder.clang_arg("-I/usr/local/include/ImageMagick-6");
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// Need to hack the linker flags as well.
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println!("cargo:rustc-link-lib=dylib=MagickWand-6");
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println!("cargo:rustc-link-search=native=/usr/local/lib");
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}
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let bindings = builder.generate().unwrap();
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let mut file = File::create(&bindings_path_str).expect("could not create bindings file");
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// Work around the include! issue in rustc (as described in the
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// rust-bindgen README file) by wrapping the generated code in a
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// `pub mod` declaration; see issue #359 in (old) rust-bindgen.
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file.write(b"pub mod bindings {\n").unwrap();
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file.write(bindings.to_string().as_bytes()).unwrap();
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file.write(b"\n}").unwrap();
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std::fs::remove_file(&gen_h_path).expect("could not remove header file");
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}
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}
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