mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-28 04:03:39 +08:00
182 lines
7.3 KiB
Rust
182 lines
7.3 KiB
Rust
#![allow(clippy::uninlined_format_args)]
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use rsconf::{LinkType, Target};
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use std::env;
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use std::error::Error;
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use std::path::{Path, PathBuf};
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fn main() {
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for key in ["DOCDIR", "DATADIR", "SYSCONFDIR", "BINDIR", "LOCALEDIR"] {
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if let Ok(val) = env::var(key) {
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// Forward some CMake config
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if val.is_empty() {
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panic!("{} is empty!", key);
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}
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println!("cargo:rustc-env={key}={val}");
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}
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}
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let rust_dir = env!("CARGO_MANIFEST_DIR");
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// Add our default to enable tools that don't go through CMake, like "cargo test" and the
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// language server.
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let build_dir =
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PathBuf::from(std::env::var("FISH_BUILD_DIR").unwrap_or(format!("{rust_dir}/build")));
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println!("cargo:rustc-env=FISH_BUILD_DIR={}", build_dir.display());
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let cached_curses_libnames = Path::join(&build_dir, "cached-curses-libnames");
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let curses_libnames: Vec<String> = if let Ok(lib_path_list) = env::var("CURSES_LIBRARY_LIST") {
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let lib_paths = lib_path_list
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.split(',')
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.filter(|s| !s.is_empty())
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.map(|s| s.to_string());
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let curses_libnames: Vec<_> = lib_paths
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.map(|libpath| {
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let stem = Path::new(&libpath).file_stem().unwrap().to_str().unwrap();
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// Ubuntu-32bit-fetched-pcre2's ncurses doesn't have the "lib" prefix.
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stem.strip_prefix("lib").unwrap_or(stem).to_owned()
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})
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.collect();
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std::fs::write(cached_curses_libnames, curses_libnames.join("\n") + "\n").unwrap();
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curses_libnames
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} else {
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let lib_cache = std::fs::read(cached_curses_libnames).unwrap_or_default();
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let lib_cache = String::from_utf8(lib_cache).unwrap();
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lib_cache
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.split('\n')
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.filter(|s| !s.is_empty())
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.map(|s| s.to_owned())
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.collect()
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};
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rsconf::link_libraries(&curses_libnames, LinkType::Default);
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cc::Build::new()
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.file("src/libc.c")
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.include(&build_dir)
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.compile("flibc.a");
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let mut build = cc::Build::new();
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// Add to the default library search path
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build.flag_if_supported("-L/usr/local/lib/");
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rsconf::add_library_search_path("/usr/local/lib");
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let mut detector = Target::new_from(build).unwrap();
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// Keep verbose mode on until we've ironed out rust build script stuff
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detector.set_verbose(true);
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detect_cfgs(detector);
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}
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/// Check target system support for certain functionality dynamically when the build is invoked,
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/// without their having to be explicitly enabled in the `cargo build --features xxx` invocation.
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///
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/// We are using [`rsconf::enable_cfg()`] instead of [`rsconf::enable_feature()`] as rust features
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/// should be used for things that a user can/would reasonably enable or disable to tweak or coerce
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/// behavior, but here we are testing for whether or not things are supported altogether.
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///
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/// This can be used to enable features that we check for and conditionally compile according to in
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/// our own codebase, but [can't be used to pull in dependencies](0) even if they're gated (in
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/// `Cargo.toml`) behind a feature we just enabled.
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///
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/// [0]: https://github.com/rust-lang/cargo/issues/5499
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fn detect_cfgs(target: Target) {
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for (name, handler) in [
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// Ignore the first entry, it just sets up the type inference. Model new entries after the
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// second line.
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(
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"",
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&(|_: &Target| Ok(false)) as &dyn Fn(&Target) -> Result<bool, Box<dyn Error>>,
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),
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("bsd", &detect_bsd),
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("gettext", &have_gettext),
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// See if the system headers provide the thread-safe localeconv_l(3) alternative to localeconv(3).
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("localeconv_l", &|target| {
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Ok(target.has_symbol_in::<String>("localeconv_l", &[]))
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}),
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("FISH_USE_POSIX_SPAWN", &|target| {
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Ok(target.has_header("spawn.h"))
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}),
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("HAVE_PIPE2", &|target| {
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Ok(target.has_symbol_in::<String>("pipe2", &[]))
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}),
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("HAVE_EVENTFD", &|target| {
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Ok(target.has_header("sys/eventfd.h"))
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}),
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("HAVE_WAITSTATUS_SIGNAL_RET", &|target| {
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Ok(target.r#if("WEXITSTATUS(0x007f) == 0x7f", "sys/wait.h"))
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}),
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] {
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match handler(&target) {
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Err(e) => rsconf::warn!("{}: {}", name, e),
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Ok(true) => rsconf::enable_cfg(name),
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Ok(false) => (),
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}
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}
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}
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/// Detect if we're being compiled for a BSD-derived OS, allowing targeting code conditionally with
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/// `#[cfg(feature = "bsd")]`.
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///
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/// Rust offers fine-grained conditional compilation per-os for the popular operating systems, but
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/// doesn't necessarily include less-popular forks nor does it group them into families more
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/// specific than "windows" vs "unix" so we can conditionally compile code for BSD systems.
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fn detect_bsd(_: &Target) -> Result<bool, Box<dyn Error>> {
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// Instead of using `uname`, we can inspect the TARGET env variable set by Cargo. This lets us
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// support cross-compilation scenarios.
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let mut target = std::env::var("TARGET").unwrap();
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if !target.chars().all(|c| c.is_ascii_lowercase()) {
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target = target.to_ascii_lowercase();
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}
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let result = target.ends_with("bsd") || target.ends_with("dragonfly");
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#[cfg(any(
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target_os = "dragonfly",
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target_os = "freebsd",
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target_os = "netbsd",
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target_os = "openbsd",
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))]
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assert!(result, "Target incorrectly detected as not BSD!");
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Ok(result)
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}
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/// Detect libintl/gettext and its needed symbols to enable internationalization/localization
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/// support.
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fn have_gettext(target: &Target) -> Result<bool, Box<dyn Error>> {
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// The following script correctly detects and links against gettext, but so long as we are using
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// C++ and generate a static library linked into the C++ binary via CMake, we need to account
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// for the CMake option WITH_GETTEXT being explicitly disabled.
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rsconf::rebuild_if_env_changed("CMAKE_WITH_GETTEXT");
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if let Some(with_gettext) = std::env::var_os("CMAKE_WITH_GETTEXT") {
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if with_gettext.eq_ignore_ascii_case("0") {
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return Ok(false);
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}
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}
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// In order for fish to correctly operate, we need some way of notifying libintl to invalidate
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// its localizations when the locale environment variables are modified. Without the libintl
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// symbol _nl_msg_cat_cntr, we cannot use gettext even if we find it.
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let mut libraries = Vec::new();
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let mut found = 0;
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let symbols = ["gettext", "_nl_msg_cat_cntr"];
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for symbol in &symbols {
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// Historically, libintl was required in order to use gettext() and co, but that
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// functionality was subsumed by some versions of libc.
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if target.has_symbol_in::<&str>(symbol, &[]) {
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// No need to link anything special for this symbol
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found += 1;
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continue;
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}
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for library in ["intl", "gettextlib"] {
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if target.has_symbol(symbol, library) {
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libraries.push(library);
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found += 1;
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continue;
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}
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}
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}
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match found {
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0 => Ok(false),
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1 => Err(format!("gettext found but cannot be used without {}", symbols[1]).into()),
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_ => {
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rsconf::link_libraries(&libraries, LinkType::Default);
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Ok(true)
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}
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}
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}
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