dd4becddd7
Due to a bug in rust-bindgen, use the bindings as generated on the Mac for the same version of MagickWand as found on FreeBSD. That is, when build.rs is invoked on a FreeBSD system, it will use the Mac-generated bindings.rs rather than pulling down rust-bindgen and invoking it to generate the bindings on the fly. See issue #385 in the rust-bindgen project for details. cargo test passes
149 lines
6.5 KiB
Rust
149 lines
6.5 KiB
Rust
/*
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* Copyright 2016 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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use std::env;
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use std::fs::{copy, File};
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use std::io::prelude::*;
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use std::path::{Path, PathBuf};
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use std::process::Command;
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static HEADER: &'static str = "#include <wand/MagickWand.h>\n";
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static LIBPATH: &'static str = "/Library/Developer/CommandLineTools/usr/lib";
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fn run_bindgen(out_dir: String, bindings_path_str: &str) {
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// Install rust-bindgen so we can generate the bindings. While the
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// bindgen crate is nice, it does not appear to support setting
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// environment variables like DYLD_LIBRARY_PATH.
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let home_dir = env::home_dir().expect("home directory");
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let mut cargo_bin = PathBuf::from(home_dir);
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cargo_bin.push(".cargo");
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cargo_bin.push("bin");
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cargo_bin.push("bindgen");
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println!("BINDGEN_PATH={:?}", cargo_bin);
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if !cargo_bin.exists() {
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Command::new("cargo")
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.arg("install")
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.arg("bindgen")
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.status().expect("cargo install bindgen");
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}
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// Check that MagickWand is installed before proceeding.
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if !Command::new("pkg-config")
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.arg("--exists")
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.arg("MagickWand")
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.status().unwrap().success() {
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panic!("MagickWand library must be installed")
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}
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// Get the compiler flags for the MagickWand library.
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let mw_cflags_output = Command::new("pkg-config")
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.arg("--cflags")
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.arg("MagickWand")
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.output().expect("pkg-config --cflags MagickWand");
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let mw_cflags = std::str::from_utf8(&mw_cflags_output.stdout).unwrap().trim();
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let mw_cflags_arr: Vec<&str> = mw_cflags.split_whitespace().collect();
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println!("CFLAGS={:?}", mw_cflags_arr);
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// Extract the library name for use with the --link option below.
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// This just happens to be the first argument from the output of
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// pkg-config when given the --libs-only-l option. We lop off the
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// leading "-l" since we only need the name (e.g. "MagickWand-6").
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let mw_ldflags_output = Command::new("pkg-config")
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.arg("--libs-only-l")
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.arg("MagickWand")
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.output().expect("pkg-config --libs-only-l MagickWand");
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let mw_ldflags = std::str::from_utf8(&mw_ldflags_output.stdout).unwrap().trim();
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let mw_ldflags_arr: Vec<&str> = mw_ldflags.split_whitespace().collect();
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let link_arg = &mw_ldflags_arr[0][2..];
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let gen_h_path = out_dir.clone() + "/gen.h";
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// Create the header file that rust-bindgen needs as input.
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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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// Combine all of that in the invocation of rust-bindgen.
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let mut cmd = &mut Command::new(cargo_bin);
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if cfg!(target_os = "macos") {
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// Mac requires that the xcode tools are installed so that
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// rustc can find the clang.dylib file. See also issue
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// https://github.com/crabtw/rust-bindgen/issues/89
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let lib_path = Path::new(LIBPATH);
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if !lib_path.exists() {
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panic!("missing {}, run xcode-select --install", LIBPATH);
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}
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cmd.env("DYLD_LIBRARY_PATH", LIBPATH);
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}
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let mut output_arg = String::from("--output");
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output_arg.push('=');
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output_arg.push_str(&bindings_path_str);
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cmd.arg("--builtins")
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// For the time being, avoid switching to proper Rust enums, as
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// that would change quite a bit of the existing code. We can
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// change that at a later time, and then remove this option.
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.arg("--no-rust-enums")
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// There are a few places where our code is still using `libc::`
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// types, rather than the new default `std::os::raw` types. We
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// can switch at a later time and then remove this option.
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.arg("--ctypes-prefix=libc")
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// Inform bindgen of the library to which we are linking,
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// otherwise it may compile but the tests will fail to link
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// properly. The -L and -l arguments provided by pkg-config
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// apparently go unused with (newer versions of?) clang.
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.arg(format!("--link={}", link_arg))
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.arg(output_arg)
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.arg(&gen_h_path)
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.arg("--");
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if cfg!(target_os = "macos") {
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// Work around issue #361 in rust-bindgen for the time being.
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cmd.arg("-U__BLOCKS__");
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}
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cmd.args(&mw_cflags_arr[..]);
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println!("BINDING_GENERATION={:?}", cmd);
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cmd.status().expect("rust-bindgen invocation");
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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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fn main() {
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//
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// If the MagickWand bindings are missing, generate them using
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// rust-bindgen.
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//
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let out_dir = ::std::env::var("OUT_DIR").unwrap();
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let bindings_path_str = out_dir.clone() + "/bindings.rs";
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if !Path::new(&bindings_path_str).exists() {
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// Either generate the bindings.rs or copy an already generated
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// version for FreeBSD. See rust-bindgen issue #385 for details. We
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// also need to hack the library path to `cargo test` can find the
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// MagickWand libraries.
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if cfg!(target_os = "freebsd") {
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copy("bindings.rs", &bindings_path_str).expect("cp bindings.rs to out_dir");
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println!("cargo:rustc-link-search=native=/usr/local/lib");
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} else {
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run_bindgen(out_dir, &bindings_path_str);
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}
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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 rust-bindgen.
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let mut bind_f = File::open(&bindings_path_str).expect("could not open bindings file");
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let mut bind_text = String::new();
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bind_f.read_to_string(&mut bind_text).expect("could not read bindings file");
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let mut file = File::create(&bindings_path_str).expect("could not create bindings file");
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file.write(b"pub mod bindings {\n").unwrap();
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file.write(bind_text.as_bytes()).unwrap();
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file.write(b"\n}").unwrap();
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}
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}
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