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use run_make_support::{rustc, serde_json};
// Please do NOT add more targets to this list!
// Per https://github.com/rust-lang/compiler-team/issues/422,
// we should be trying to move these targets to dynamically link
// musl libc by default.
static LEGACY_STATIC_LINKING_TARGETS: &[&'static str] = &[
"aarch64-unknown-linux-musl",
"arm-unknown-linux-musleabi",
"arm-unknown-linux-musleabihf",
"armv5te-unknown-linux-musleabi",
"armv7-unknown-linux-musleabi",
"armv7-unknown-linux-musleabihf",
"i586-unknown-linux-musl",
"i686-unknown-linux-musl",
"mips64-unknown-linux-musl",
"mips64-unknown-linux-muslabi64",
"mips64el-unknown-linux-muslabi64",
"powerpc-unknown-linux-musl",
"powerpc-unknown-linux-muslspe",
"powerpc64-unknown-linux-musl",
"powerpc64le-unknown-linux-musl",
"riscv32gc-unknown-linux-musl",
"s390x-unknown-linux-musl",
"thumbv7neon-unknown-linux-musleabihf",
"x86_64-unknown-linux-musl",
];
fn main() {
let targets = rustc().print("target-list").run().stdout_utf8();
for target in targets.lines() {
let abi = target.split('-').last().unwrap();
if !abi.starts_with("musl") {
continue;
}
let target_spec_json = rustc()
.print("target-spec-json")
.target(target)
.arg("-Zunstable-options")
.run()
.stdout_utf8();
let target_spec: serde_json::Value =
serde_json::from_str(&target_spec_json).expect("failed to parse target-spec-json");
let target_families = &target_spec["target-family"];
// WebAssembly doesn't support dynamic linking yet; all musl targets
// need to be statically linked.
if target_families
.as_array()
.expect("target-family wasn't an array")
.iter()
.filter_map(|x| x.as_str())
.any(|family| family == "wasm")
{
continue;
}
let default = &target_spec["crt-static-default"];
// If the value is `null`, then the default to dynamically link from
// musl_base was not overridden.
if default.is_null() {
continue;
}
if default.as_bool().expect("wasn't a boolean")
&& !LEGACY_STATIC_LINKING_TARGETS.contains(&target)
{
panic!("{target} statically links musl libc when it should dynamically link it");
}
}
}
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