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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(),
_ => {}
}
}
// Used to detect the value of the `__ANDROID_API__`
// builtin #define
const MARKER: &str = "BACKTRACE_RS_ANDROID_APIVERSION";
const ANDROID_API_C: &str = "
BACKTRACE_RS_ANDROID_APIVERSION __ANDROID_API__
";
fn build_android() {
// Create `android-api.c` on demand.
// Required to support calling this from the `std` build script.
let out_dir = env::var_os("OUT_DIR").unwrap();
let android_api_c = Path::new(&out_dir).join("android-api.c");
std::fs::write(&android_api_c, ANDROID_API_C).unwrap();
let expansion = match cc::Build::new().file(&android_api_c).try_expand() {
Ok(result) => result,
Err(e) => {
eprintln!("warning: android version detection failed while running C compiler: {e}");
return;
}
};
let expansion = match std::str::from_utf8(&expansion) {
Ok(s) => s,
Err(_) => return,
};
eprintln!("expanded android version detection:\n{expansion}");
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\"");
}
}
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