mirror of
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f5a05adb25
to let people experiment with this target out of tree. The MSP430 architecture is used in 16-bit microcontrollers commonly used in Digital Signal Processing applications.
222 lines
8.6 KiB
Rust
222 lines
8.6 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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extern crate gcc;
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extern crate build_helper;
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use std::process::Command;
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use std::env;
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use std::path::{PathBuf, Path};
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use build_helper::output;
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fn main() {
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println!("cargo:rustc-cfg=cargobuild");
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let target = env::var("TARGET").expect("TARGET was not set");
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let llvm_config = env::var_os("LLVM_CONFIG")
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.map(PathBuf::from)
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.unwrap_or_else(|| {
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if let Some(dir) = env::var_os("CARGO_TARGET_DIR").map(PathBuf::from) {
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let to_test = dir.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 to_test;
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}
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}
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PathBuf::from("llvm-config")
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});
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println!("cargo:rerun-if-changed={}", llvm_config.display());
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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 it's 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 becaues 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", "arm", "aarch64", "mips", "powerpc", "pnacl", "systemz", "jsbackend", "msp430"];
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// FIXME: surely we don't need all these components, right? Stuff like mcjit
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// or interpreter the compiler itself never uses.
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let required_components = &["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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"mcjit",
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"interpreter",
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"instrumentation"];
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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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// 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 = gcc::Config::new();
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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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cfg.flag(flag);
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}
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for component in &components[..] {
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let mut flag = String::from("-DLLVM_COMPONENT_");
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flag.push_str(&component.to_uppercase());
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cfg.flag(&flag);
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}
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if env::var_os("LLVM_RUSTLLVM").is_some() {
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cfg.flag("-DLLVM_RUSTLLVM");
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}
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cfg.file("../rustllvm/PassWrapper.cpp")
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.file("../rustllvm/RustWrapper.cpp")
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.file("../rustllvm/ArchiveWrapper.cpp")
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.cpp(true)
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.cpp_link_stdlib(None) // we handle this below
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.compile("librustllvm.a");
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// Link in all LLVM libraries, if we're uwring 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("--libs");
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// Force static linking with "--link-static" if available.
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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('.');
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if let (Some(major), Some(minor)) = (parts.next().and_then(|s| s.parse::<u32>().ok()),
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parts.next().and_then(|s| s.parse::<u32>().ok())) {
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if major > 3 || (major == 3 && minor >= 9) {
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cmd.arg("--link-static");
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}
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}
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if !is_crossed {
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cmd.arg("--system-libs");
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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 lib.starts_with("-l") {
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&lib[2..]
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} else if lib.starts_with("-") {
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&lib[1..]
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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_right_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_right_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") {
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"static"
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} else {
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"dylib"
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};
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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("--ldflags");
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for lib in output(&mut cmd).split_whitespace() {
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if lib.starts_with("-LIBPATH:") {
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println!("cargo:rustc-link-search=native={}", &lib[9..]);
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} else if is_crossed {
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if lib.starts_with("-L") {
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println!("cargo:rustc-link-search=native={}",
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lib[2..].replace(&host, &target));
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}
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} else if lib.starts_with("-l") {
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println!("cargo:rustc-link-lib={}", &lib[2..]);
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} else if lib.starts_with("-L") {
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println!("cargo:rustc-link-search=native={}", &lib[2..]);
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}
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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) = env::var_os("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={}",
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path.parent().unwrap().display());
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println!("cargo:rustc-link-lib=static=stdc++");
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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=stdc++");
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}
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}
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}
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