68ae6173fe
As discussed in #41570, UNIX systems often cache the contents of /etc/resolv.conf, which can cause lookup failures to persist even after a network connection becomes available. This patch modifies lookup_host to force a reload of the nameserver entries following a lookup failure. This is in line with what many C programs already do (see #41570 for details). On systems with nscd, this should not be necessary, but not all systems run nscd. Introduces an std linkage dependency on libresolv on macOS/iOS (which also makes it necessary to update run-make/tools.mk). Fixes #41570. Depends on rust-lang/libc#585.
102 lines
4.5 KiB
Rust
102 lines
4.5 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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#![deny(warnings)]
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extern crate build_helper;
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extern crate gcc;
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use std::env;
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use std::process::Command;
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use build_helper::{run, native_lib_boilerplate};
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fn main() {
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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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if cfg!(feature = "backtrace") && !target.contains("apple") && !target.contains("msvc") &&
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!target.contains("emscripten") && !target.contains("fuchsia") && !target.contains("redox") {
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let _ = build_libbacktrace(&host, &target);
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}
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if target.contains("linux") {
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if target.contains("android") {
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println!("cargo:rustc-link-lib=dl");
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println!("cargo:rustc-link-lib=log");
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println!("cargo:rustc-link-lib=gcc");
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} else if !target.contains("musl") || target.contains("mips") {
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println!("cargo:rustc-link-lib=dl");
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println!("cargo:rustc-link-lib=rt");
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println!("cargo:rustc-link-lib=pthread");
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}
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} else if target.contains("freebsd") {
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println!("cargo:rustc-link-lib=execinfo");
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println!("cargo:rustc-link-lib=pthread");
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} else if target.contains("dragonfly") || target.contains("bitrig") ||
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target.contains("netbsd") || target.contains("openbsd") {
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println!("cargo:rustc-link-lib=pthread");
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} else if target.contains("apple-darwin") {
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println!("cargo:rustc-link-lib=System");
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// res_init and friends require -lresolv on macOS/iOS.
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// See #41582 and http://blog.achernya.com/2013/03/os-x-has-silly-libsystem.html
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println!("cargo:rustc-link-lib=resolv");
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} else if target.contains("apple-ios") {
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println!("cargo:rustc-link-lib=System");
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println!("cargo:rustc-link-lib=objc");
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println!("cargo:rustc-link-lib=framework=Security");
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println!("cargo:rustc-link-lib=framework=Foundation");
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println!("cargo:rustc-link-lib=resolv");
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} else if target.contains("windows") {
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println!("cargo:rustc-link-lib=advapi32");
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println!("cargo:rustc-link-lib=ws2_32");
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println!("cargo:rustc-link-lib=userenv");
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println!("cargo:rustc-link-lib=shell32");
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} else if target.contains("fuchsia") {
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// use system-provided libbacktrace
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if cfg!(feature = "backtrace") {
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println!("cargo:rustc-link-lib=backtrace");
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}
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println!("cargo:rustc-link-lib=magenta");
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println!("cargo:rustc-link-lib=mxio");
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println!("cargo:rustc-link-lib=launchpad"); // for std::process
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}
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}
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fn build_libbacktrace(host: &str, target: &str) -> Result<(), ()> {
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let native = native_lib_boilerplate("libbacktrace", "libbacktrace", "backtrace", ".libs")?;
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let compiler = gcc::Config::new().get_compiler();
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// only msvc returns None for ar so unwrap is okay
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let ar = build_helper::cc2ar(compiler.path(), target).unwrap();
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let mut cflags = compiler.args().iter().map(|s| s.to_str().unwrap())
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.collect::<Vec<_>>().join(" ");
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cflags.push_str(" -fvisibility=hidden");
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run(Command::new("sh")
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.current_dir(&native.out_dir)
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.arg(native.src_dir.join("configure").to_str().unwrap()
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.replace("C:\\", "/c/")
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.replace("\\", "/"))
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.arg("--with-pic")
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.arg("--disable-multilib")
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.arg("--disable-shared")
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.arg("--disable-host-shared")
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.arg(format!("--host={}", build_helper::gnu_target(target)))
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.arg(format!("--build={}", build_helper::gnu_target(host)))
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.env("CC", compiler.path())
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.env("AR", &ar)
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.env("RANLIB", format!("{} s", ar.display()))
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.env("CFLAGS", cflags));
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run(Command::new(build_helper::make(host))
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.current_dir(&native.out_dir)
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.arg(format!("INCDIR={}", native.src_dir.display()))
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.arg("-j").arg(env::var("NUM_JOBS").expect("NUM_JOBS was not set")));
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Ok(())
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}
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