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https://github.com/rust-lang/rust.git
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320 lines
12 KiB
Rust
320 lines
12 KiB
Rust
use std::env;
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use std::path::{Path, PathBuf};
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use std::process::Command;
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use build_helper::{output, tracked_env_var_os};
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fn detect_llvm_link() -> (&'static str, &'static str) {
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// Force the link mode we want, preferring static by default, but
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// possibly overridden by `configure --enable-llvm-link-shared`.
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if tracked_env_var_os("LLVM_LINK_SHARED").is_some() {
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("dylib", "--link-shared")
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} else {
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("static", "--link-static")
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}
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}
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fn main() {
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if tracked_env_var_os("RUST_CHECK").is_some() {
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// If we're just running `check`, there's no need for LLVM to be built.
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return;
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}
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build_helper::restore_library_path();
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let target = env::var("TARGET").expect("TARGET was not set");
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let llvm_config =
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tracked_env_var_os("LLVM_CONFIG").map(|x| Some(PathBuf::from(x))).unwrap_or_else(|| {
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if let Some(dir) = tracked_env_var_os("CARGO_TARGET_DIR").map(PathBuf::from) {
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let to_test = dir
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.parent()
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.unwrap()
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.parent()
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.unwrap()
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.join(&target)
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.join("llvm/bin/llvm-config");
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if Command::new(&to_test).output().is_ok() {
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return Some(to_test);
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}
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}
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None
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});
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if let Some(llvm_config) = &llvm_config {
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println!("cargo:rerun-if-changed={}", llvm_config.display());
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}
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let llvm_config = llvm_config.unwrap_or_else(|| PathBuf::from("llvm-config"));
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// Test whether we're cross-compiling LLVM. This is a pretty rare case
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// currently where we're producing an LLVM for a different platform than
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// what this build script is currently running on.
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//
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// In that case, there's no guarantee that we can actually run the target,
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// so the build system works around this by giving us the LLVM_CONFIG for
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// the host platform. This only really works if the host LLVM and target
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// LLVM are compiled the same way, but for us that's typically the case.
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//
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// We *want* detect this cross compiling situation by asking llvm-config
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// what its host-target is. If that's not the TARGET, then we're cross
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// compiling. Unfortunately `llvm-config` seems either be buggy, or we're
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// misconfiguring it, because the `i686-pc-windows-gnu` build of LLVM will
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// report itself with a `--host-target` of `x86_64-pc-windows-gnu`. This
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// tricks us into thinking we're doing a cross build when we aren't, so
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// havoc ensues.
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//
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// In any case, if we're cross compiling, this generally just means that we
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// can't trust all the output of llvm-config because it might be targeted
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// for the host rather than the target. As a result a bunch of blocks below
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// are gated on `if !is_crossed`
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let target = env::var("TARGET").expect("TARGET was not set");
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let host = env::var("HOST").expect("HOST was not set");
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let is_crossed = target != host;
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let optional_components = &[
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"x86",
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"arm",
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"aarch64",
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"amdgpu",
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"avr",
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"mips",
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"powerpc",
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"systemz",
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"jsbackend",
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"webassembly",
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"msp430",
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"sparc",
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"nvptx",
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"hexagon",
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"riscv",
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];
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let mut version_cmd = Command::new(&llvm_config);
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version_cmd.arg("--version");
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let version_output = output(&mut version_cmd);
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let mut parts = version_output.split('.').take(2).filter_map(|s| s.parse::<u32>().ok());
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let (major, _minor) = if let (Some(major), Some(minor)) = (parts.next(), parts.next()) {
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(major, minor)
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} else {
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(8, 0)
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};
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let required_components = &[
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"ipo",
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"bitreader",
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"bitwriter",
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"linker",
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"asmparser",
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"lto",
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"coverage",
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"instrumentation",
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];
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let components = output(Command::new(&llvm_config).arg("--components"));
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let mut components = components.split_whitespace().collect::<Vec<_>>();
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components.retain(|c| optional_components.contains(c) || required_components.contains(c));
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for component in required_components {
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if !components.contains(component) {
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panic!("require llvm component {} but wasn't found", component);
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}
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}
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for component in components.iter() {
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println!("cargo:rustc-cfg=llvm_component=\"{}\"", component);
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}
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if major >= 9 {
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println!("cargo:rustc-cfg=llvm_has_msp430_asm_parser");
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}
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// Link in our own LLVM shims, compiled with the same flags as LLVM
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let mut cmd = Command::new(&llvm_config);
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cmd.arg("--cxxflags");
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let cxxflags = output(&mut cmd);
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let mut cfg = cc::Build::new();
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cfg.warnings(false);
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for flag in cxxflags.split_whitespace() {
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// Ignore flags like `-m64` when we're doing a cross build
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if is_crossed && flag.starts_with("-m") {
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continue;
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}
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if flag.starts_with("-flto") {
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continue;
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}
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// -Wdate-time is not supported by the netbsd cross compiler
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if is_crossed && target.contains("netbsd") && flag.contains("date-time") {
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continue;
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}
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// Include path contains host directory, replace it with target
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if is_crossed && flag.starts_with("-I") {
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cfg.flag(&flag.replace(&host, &target));
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continue;
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}
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cfg.flag(flag);
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}
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for component in &components {
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let mut flag = String::from("LLVM_COMPONENT_");
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flag.push_str(&component.to_uppercase());
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cfg.define(&flag, None);
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}
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if tracked_env_var_os("LLVM_RUSTLLVM").is_some() {
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cfg.define("LLVM_RUSTLLVM", None);
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}
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if tracked_env_var_os("LLVM_NDEBUG").is_some() {
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cfg.define("NDEBUG", None);
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cfg.debug(false);
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}
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build_helper::rerun_if_changed_anything_in_dir(Path::new("llvm-wrapper"));
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cfg.file("llvm-wrapper/PassWrapper.cpp")
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.file("llvm-wrapper/RustWrapper.cpp")
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.file("llvm-wrapper/ArchiveWrapper.cpp")
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.file("llvm-wrapper/CoverageMappingWrapper.cpp")
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.file("llvm-wrapper/Linker.cpp")
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.cpp(true)
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.cpp_link_stdlib(None) // we handle this below
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.compile("llvm-wrapper");
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let (llvm_kind, llvm_link_arg) = detect_llvm_link();
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// Link in all LLVM libraries, if we're using the "wrong" llvm-config then
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// we don't pick up system libs because unfortunately they're for the host
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// of llvm-config, not the target that we're attempting to link.
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let mut cmd = Command::new(&llvm_config);
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cmd.arg(llvm_link_arg).arg("--libs");
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if !is_crossed {
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cmd.arg("--system-libs");
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} else if target.contains("windows-gnu") {
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println!("cargo:rustc-link-lib=shell32");
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println!("cargo:rustc-link-lib=uuid");
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} else if target.contains("netbsd") || target.contains("haiku") {
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println!("cargo:rustc-link-lib=z");
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}
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cmd.args(&components);
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for lib in output(&mut cmd).split_whitespace() {
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let name = if let Some(stripped) = lib.strip_prefix("-l") {
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stripped
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} else if let Some(stripped) = lib.strip_prefix('-') {
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stripped
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} else if Path::new(lib).exists() {
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// On MSVC llvm-config will print the full name to libraries, but
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// we're only interested in the name part
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let name = Path::new(lib).file_name().unwrap().to_str().unwrap();
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name.trim_end_matches(".lib")
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} else if lib.ends_with(".lib") {
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// Some MSVC libraries just come up with `.lib` tacked on, so chop
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// that off
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lib.trim_end_matches(".lib")
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} else {
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continue;
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};
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// Don't need or want this library, but LLVM's CMake build system
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// doesn't provide a way to disable it, so filter it here even though we
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// may or may not have built it. We don't reference anything from this
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// library and it otherwise may just pull in extra dependencies on
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// libedit which we don't want
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if name == "LLVMLineEditor" {
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continue;
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}
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let kind = if name.starts_with("LLVM") { llvm_kind } else { "dylib" };
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println!("cargo:rustc-link-lib={}={}", kind, name);
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}
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// LLVM ldflags
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//
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// If we're a cross-compile of LLVM then unfortunately we can't trust these
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// ldflags (largely where all the LLVM libs are located). Currently just
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// hack around this by replacing the host triple with the target and pray
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// that those -L directories are the same!
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let mut cmd = Command::new(&llvm_config);
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cmd.arg(llvm_link_arg).arg("--ldflags");
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for lib in output(&mut cmd).split_whitespace() {
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if is_crossed {
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if let Some(stripped) = lib.strip_prefix("-LIBPATH:") {
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println!("cargo:rustc-link-search=native={}", stripped.replace(&host, &target));
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} else if let Some(stripped) = lib.strip_prefix("-L") {
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println!("cargo:rustc-link-search=native={}", stripped.replace(&host, &target));
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}
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} else if let Some(stripped) = lib.strip_prefix("-LIBPATH:") {
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println!("cargo:rustc-link-search=native={}", stripped);
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} else if let Some(stripped) = lib.strip_prefix("-l") {
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println!("cargo:rustc-link-lib={}", stripped);
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} else if let Some(stripped) = lib.strip_prefix("-L") {
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println!("cargo:rustc-link-search=native={}", stripped);
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}
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}
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// Some LLVM linker flags (-L and -l) may be needed even when linking
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// rustc_llvm, for example when using static libc++, we may need to
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// manually specify the library search path and -ldl -lpthread as link
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// dependencies.
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let llvm_linker_flags = tracked_env_var_os("LLVM_LINKER_FLAGS");
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if let Some(s) = llvm_linker_flags {
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for lib in s.into_string().unwrap().split_whitespace() {
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if let Some(stripped) = lib.strip_prefix("-l") {
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println!("cargo:rustc-link-lib={}", stripped);
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} else if let Some(stripped) = lib.strip_prefix("-L") {
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println!("cargo:rustc-link-search=native={}", stripped);
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}
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}
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}
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let llvm_static_stdcpp = tracked_env_var_os("LLVM_STATIC_STDCPP");
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let llvm_use_libcxx = tracked_env_var_os("LLVM_USE_LIBCXX");
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let stdcppname = if target.contains("openbsd") {
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if target.contains("sparc64") { "estdc++" } else { "c++" }
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} else if target.contains("freebsd") {
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"c++"
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} else if target.contains("darwin") {
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"c++"
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} else if target.contains("netbsd") && llvm_static_stdcpp.is_some() {
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// NetBSD uses a separate library when relocation is required
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"stdc++_pic"
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} else if llvm_use_libcxx.is_some() {
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"c++"
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} else {
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"stdc++"
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};
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// RISC-V requires libatomic for sub-word atomic operations
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if target.starts_with("riscv") {
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println!("cargo:rustc-link-lib=atomic");
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}
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// C++ runtime library
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if !target.contains("msvc") {
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if let Some(s) = llvm_static_stdcpp {
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assert!(!cxxflags.contains("stdlib=libc++"));
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let path = PathBuf::from(s);
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println!("cargo:rustc-link-search=native={}", path.parent().unwrap().display());
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if target.contains("windows") {
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println!("cargo:rustc-link-lib=static-nobundle={}", stdcppname);
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} else {
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println!("cargo:rustc-link-lib=static={}", stdcppname);
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}
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} else if cxxflags.contains("stdlib=libc++") {
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println!("cargo:rustc-link-lib=c++");
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} else {
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println!("cargo:rustc-link-lib={}", stdcppname);
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}
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}
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// Libstdc++ depends on pthread which Rust doesn't link on MinGW
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// since nothing else requires it.
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if target.contains("windows-gnu") {
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println!("cargo:rustc-link-lib=static-nobundle=pthread");
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}
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}
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