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