50 lines
1.4 KiB
Rust
50 lines
1.4 KiB
Rust
extern crate cc;
|
|
|
|
use std::env;
|
|
use std::path::Path;
|
|
|
|
// Must be public so the build script of `std` can call it.
|
|
pub fn main() {
|
|
match env::var("CARGO_CFG_TARGET_OS").unwrap_or_default().as_str() {
|
|
"android" => build_android(),
|
|
_ => {}
|
|
}
|
|
}
|
|
|
|
fn build_android() {
|
|
// Resolve `src/android-api.c` relative to this file.
|
|
// Required to support calling this from the `std` build script.
|
|
let android_api_c = Path::new(file!())
|
|
.parent()
|
|
.unwrap()
|
|
.join("src/android-api.c");
|
|
let expansion = match cc::Build::new().file(android_api_c).try_expand() {
|
|
Ok(result) => result,
|
|
Err(e) => {
|
|
println!("failed to run C compiler: {}", e);
|
|
return;
|
|
}
|
|
};
|
|
let expansion = match std::str::from_utf8(&expansion) {
|
|
Ok(s) => s,
|
|
Err(_) => return,
|
|
};
|
|
println!("expanded android version detection:\n{}", expansion);
|
|
let marker = "APIVERSION";
|
|
let i = match expansion.find(marker) {
|
|
Some(i) => i,
|
|
None => return,
|
|
};
|
|
let version = match expansion[i + marker.len() + 1..].split_whitespace().next() {
|
|
Some(s) => s,
|
|
None => return,
|
|
};
|
|
let version = match version.parse::<u32>() {
|
|
Ok(n) => n,
|
|
Err(_) => return,
|
|
};
|
|
if version >= 21 {
|
|
println!("cargo:rustc-cfg=feature=\"dl_iterate_phdr\"");
|
|
}
|
|
}
|