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|
use std::env;
use std::fs;
use std::path::{Path, PathBuf};
use std::process::Command;
fn zig_target(target: &str) -> &str {
match target {
"x86_64-unknown-linux-gnu" => "x86_64-linux-gnu",
"aarch64-unknown-linux-gnu" => "aarch64-linux-gnu",
"x86_64-unknown-linux-musl" => "x86_64-linux-musl",
"aarch64-unknown-linux-musl" => "aarch64-linux-musl",
"x86_64-apple-darwin" => "x86_64-macos",
"aarch64-apple-darwin" => "aarch64-macos",
other => panic!("unsupported target for libghostty-vt build: {other}"),
}
}
fn env_bool(name: &str) -> Option<bool> {
match env::var(name) {
Ok(value) => match value.to_ascii_lowercase().as_str() {
"1" | "true" | "yes" | "on" => Some(true),
"0" | "false" | "no" | "off" => Some(false),
other => panic!("invalid boolean value for {name}: {other}"),
},
Err(env::VarError::NotPresent) => None,
Err(err) => panic!("failed to read {name}: {err}"),
}
}
/// Extract the final archive path for a named Zig runtime archive from
/// verbose compiler/linker output.
fn find_archive_path(output: &str, archive_name: &str) -> Option<PathBuf> {
output
.split_whitespace()
.map(|token| token.trim_matches(|c| matches!(c, '"' | '\'')))
.filter(|token| token.ends_with(archive_name) && token.contains('/'))
.map(PathBuf::from)
.last()
}
/// Ask Zig which musl-compatible C++ runtime archives it would use for a
/// trivial target build.
///
/// This is necessary because `cargo:rustc-link-lib=stdc++` on a musl target
/// resolves through the host toolchain and produces a mixed musl/glibc binary,
/// while Zig's musl C++ driver resolves to its bundled libc++/libc++abi
/// archives.
fn zig_musl_cpp_runtime_archives(out_dir: &Path, zig_target: &str) -> (PathBuf, PathBuf) {
let probe_dir = out_dir.join("zig-cpp-runtime-probe");
fs::create_dir_all(&probe_dir).expect("failed to create Zig C++ runtime probe dir");
let source = probe_dir.join("probe.cpp");
fs::write(&source, "int main() { return 0; }\n")
.expect("failed to write Zig C++ runtime probe source");
let binary = probe_dir.join("probe");
let local_cache = probe_dir.join("local-cache");
let global_cache = probe_dir.join("global-cache");
let output = Command::new("zig")
.arg("c++")
.arg("-target")
.arg(zig_target)
.arg("-v")
.arg(&source)
.arg("-o")
.arg(&binary)
.env("ZIG_LOCAL_CACHE_DIR", &local_cache)
.env("ZIG_GLOBAL_CACHE_DIR", &global_cache)
.output()
.expect("failed to execute Zig C++ runtime probe");
let stdout = String::from_utf8_lossy(&output.stdout);
let stderr = String::from_utf8_lossy(&output.stderr);
let combined = format!("{stdout}\n{stderr}");
assert!(
output.status.success(),
"Zig C++ runtime probe failed: {}\nstdout:\n{}\nstderr:\n{}",
output.status,
stdout,
stderr
);
let libcxxabi = find_archive_path(&combined, "libc++abi.a").unwrap_or_else(|| {
panic!(
"failed to locate Zig musl libc++abi archive path for target {zig_target}; zig output was:\n{combined}"
)
});
let libcxx = find_archive_path(&combined, "libc++.a").unwrap_or_else(|| {
panic!(
"failed to locate Zig musl libc++ archive path for target {zig_target}; zig output was:\n{combined}"
)
});
(libcxxabi, libcxx)
}
fn main() {
println!("cargo:rerun-if-changed=build.rs");
println!("cargo:rerun-if-changed=vendor/libghostty-vt.vendor.json");
println!("cargo:rerun-if-changed=vendor/libghostty-vt/build.zig");
println!("cargo:rerun-if-changed=vendor/libghostty-vt/build.zig.zon");
println!("cargo:rerun-if-changed=vendor/libghostty-vt/VERSION");
println!("cargo:rerun-if-env-changed=LIBGHOSTTY_VT_OPTIMIZE");
println!("cargo:rerun-if-env-changed=LIBGHOSTTY_VT_SIMD");
let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR"));
let out_dir = PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR"));
let vendored_dir = manifest_dir.join("vendor/libghostty-vt");
let optimize = env::var("LIBGHOSTTY_VT_OPTIMIZE").unwrap_or_else(|_| "ReleaseFast".into());
let simd = env_bool("LIBGHOSTTY_VT_SIMD").unwrap_or(true);
let target = env::var("TARGET").expect("TARGET");
let zig_target = zig_target(&target);
let version_string = fs::read_to_string(vendored_dir.join("VERSION"))
.expect("failed to read vendored libghostty-vt VERSION")
.trim()
.to_string();
let status = Command::new("zig")
.arg("build")
.arg("-Demit-lib-vt")
.arg(format!("-Doptimize={optimize}"))
.arg(format!("-Dsimd={simd}"))
.arg(format!("-Dtarget={zig_target}"))
.arg(format!("-Dversion-string={version_string}"))
.current_dir(&vendored_dir)
.status()
.expect("failed to execute zig build for vendored libghostty-vt");
assert!(
status.success(),
"zig build for vendored libghostty-vt failed: {status}"
);
let lib_dir = vendored_dir.join("zig-out/lib");
println!("cargo:rustc-link-search=native={}", lib_dir.display());
if target.contains("apple-darwin") {
let static_lib = lib_dir.join("libghostty-vt.a");
println!("cargo:rustc-link-arg={}", static_lib.display());
if simd {
println!("cargo:rustc-link-lib=dylib=c++");
}
} else {
println!("cargo:rustc-link-lib=static=ghostty-vt");
if target.contains("linux") && simd {
if target.contains("musl") {
// Keep musl SIMD builds entirely in Zig's musl/libc++ runtime
// world. Asking Cargo to link `stdc++` here resolves through the
// host toolchain and reintroduces the crashing mixed-runtime
// artifact shape.
let (libcxxabi, libcxx) = zig_musl_cpp_runtime_archives(&out_dir, zig_target);
let libcxxabi_dir = libcxxabi
.parent()
.expect("libc++abi archive should have a parent dir");
let libcxx_dir = libcxx
.parent()
.expect("libc++ archive should have a parent dir");
println!("cargo:rustc-link-search=native={}", libcxxabi_dir.display());
if libcxx_dir != libcxxabi_dir {
println!("cargo:rustc-link-search=native={}", libcxx_dir.display());
}
println!("cargo:rustc-link-lib=static=c++abi");
println!("cargo:rustc-link-lib=static=c++");
} else {
println!("cargo:rustc-link-lib=dylib=stdc++");
}
}
}
}
|
