adaptivegrain/vapoursynth-sys/build.rs

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Rust
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2019-05-30 13:06:53 +02:00
use std::env;
use std::path::PathBuf;
const LIBRARY_DIR_VARIABLE: &str = "VAPOURSYNTH_LIB_DIR";
fn main() {
// Make sure the build script is re-run if our env variable is changed.
println!("cargo:rerun-if-env-changed={}", LIBRARY_DIR_VARIABLE);
let windows = env::var("TARGET").unwrap().contains("windows");
// Get the default library dir on Windows.
let default_library_dir = if windows {
get_default_library_dir()
} else {
None
};
// Library directory override or the default dir on windows.
if let Some(dir) = env::var(LIBRARY_DIR_VARIABLE).ok().or(default_library_dir) {
println!("cargo:rustc-link-search=native={}", dir);
}
// Handle linking to VapourSynth libs.
if env::var("CARGO_FEATURE_VAPOURSYNTH_FUNCTIONS").is_ok() {
println!("cargo:rustc-link-lib=vapoursynth");
}
if env::var("CARGO_FEATURE_VSSCRIPT_FUNCTIONS").is_ok() {
let vsscript_lib_name = if windows {
"vsscript"
} else {
"vapoursynth-script"
};
println!("cargo:rustc-link-lib={}", vsscript_lib_name);
}
}
// Returns the default library dir on Windows.
// The default dir is where the VapourSynth installer puts the libraries.
fn get_default_library_dir() -> Option<String> {
let host = env::var("HOST").ok()?;
// If the host isn't Windows we don't have %programfiles%.
if !host.contains("windows") {
return None;
}
let programfiles = if host.starts_with("i686") {
env::var("programfiles")
} else {
env::var("programfiles(x86)")
};
let suffix = if env::var("TARGET").ok()?.starts_with("i686") {
"lib32"
} else {
"lib64"
};
let mut path = PathBuf::from(programfiles.ok()?);
path.push("VapourSynth");
path.push("sdk");
path.push(suffix);
path.to_str().map(|s| s.to_owned())
}