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Query target_os cfg flags from the env

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This commit is contained in:
maik 2019-06-21 10:44:36 +02:00
parent 0bbc0436e8
commit b8a269ca29
1 changed files with 16 additions and 1 deletions
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17
build.rs
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@ -1,4 +1,15 @@
use std::path::PathBuf;
// Iterator over target_os cfg flags
fn target_os() -> impl Iterator<Item = String> {
std::env::vars().filter_map(|(flag, val)| {
const NAME: &'static str = "CARGO_CFG_TARGET_OS";
if flag.starts_with(NAME) {
Some(val)
} else {
None
}
})
}
// Features are not used inside build scripts, so we have to explicitly query them from the
// enviroment
fn is_external_enabled() -> bool {
@ -16,7 +27,11 @@ fn is_external_enabled() -> bool {
.is_some()
}
fn main() {
if !(cfg!(target_os = "macos") || cfg!(target_os = "ios")) {
let supported_platforms = ["macos", "ios"];
let is_mac_or_ios = target_os()
.find(|target| supported_platforms.contains(&target.as_str()))
.is_some();
if !is_mac_or_ios {
panic!("ash-molten can only be built on macOS or of iOS");
}
// The 'external' feature was not enabled. Molten will be built automaticaly.