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use crate::utils::{get_gcc_path, get_os_name, get_rustc_host_triple};
use std::collections::HashMap;
use std::env as std_env;
pub struct ConfigInfo {
pub target: String,
pub target_triple: String,
pub rustc_command: Vec<String>,
}
// Returns the beginning for the command line of rustc.
pub fn set_config(
env: &mut HashMap<String, String>,
test_flags: &[String],
gcc_path: Option<&str>,
) -> Result<ConfigInfo, String> {
env.insert("CARGO_INCREMENTAL".to_string(), "0".to_string());
let gcc_path = match gcc_path {
Some(path) => path.to_string(),
None => get_gcc_path()?,
};
env.insert("GCC_PATH".to_string(), gcc_path.clone());
let os_name = get_os_name()?;
let dylib_ext = match os_name.as_str() {
"Linux" => "so",
"Darwin" => "dylib",
os => return Err(format!("unsupported OS `{}`", os)),
};
let host_triple = get_rustc_host_triple()?;
let mut linker = None;
let mut target_triple = host_triple.clone();
let mut target = target_triple.clone();
// We skip binary name and the command.
let mut args = std::env::args().skip(2);
let mut set_target_triple = false;
let mut set_target = false;
while let Some(arg) = args.next() {
match arg.as_str() {
"--target-triple" => {
if let Some(arg) = args.next() {
target_triple = arg;
set_target_triple = true;
} else {
return Err(
"Expected a value after `--target-triple`, found nothing".to_string()
);
}
},
"--target" => {
if let Some(arg) = args.next() {
target = arg;
set_target = true;
} else {
return Err(
"Expected a value after `--target`, found nothing".to_string()
);
}
},
_ => (),
}
}
if set_target_triple && !set_target {
target = target_triple.clone();
}
if host_triple != target_triple {
linker = Some(format!("-Clinker={}-gcc", target_triple));
}
let current_dir =
std_env::current_dir().map_err(|error| format!("`current_dir` failed: {:?}", error))?;
let channel = if let Some(channel) = env.get("CHANNEL") {
channel.as_str()
} else {
"debug"
};
let cg_backend_path = current_dir
.join("target")
.join(channel)
.join(&format!("librustc_codegen_gcc.{}", dylib_ext));
let sysroot_path = current_dir.join("build_sysroot/sysroot");
let mut rustflags = Vec::new();
if let Some(cg_rustflags) = env.get("CG_RUSTFLAGS") {
rustflags.push(cg_rustflags.clone());
}
if let Some(linker) = linker {
rustflags.push(linker.to_string());
}
rustflags.extend_from_slice(&[
"-Csymbol-mangling-version=v0".to_string(),
"-Cdebuginfo=2".to_string(),
format!("-Zcodegen-backend={}", cg_backend_path.display()),
"--sysroot".to_string(),
sysroot_path.display().to_string(),
]);
// Since we don't support ThinLTO, disable LTO completely when not trying to do LTO.
// TODO(antoyo): remove when we can handle ThinLTO.
if !env.contains_key(&"FAT_LTO".to_string()) {
rustflags.push("-Clto=off".to_string());
}
rustflags.extend_from_slice(test_flags);
// FIXME(antoyo): remove once the atomic shim is gone
if os_name == "Darwin" {
rustflags.extend_from_slice(&[
"-Clink-arg=-undefined".to_string(),
"-Clink-arg=dynamic_lookup".to_string(),
]);
}
env.insert("RUSTFLAGS".to_string(), rustflags.join(" "));
// display metadata load errors
env.insert("RUSTC_LOG".to_string(), "warn".to_string());
let sysroot = current_dir.join(&format!(
"build_sysroot/sysroot/lib/rustlib/{}/lib",
target_triple
));
let ld_library_path = format!(
"{target}:{sysroot}:{gcc_path}",
target = current_dir.join("target/out").display(),
sysroot = sysroot.display(),
);
env.insert("LD_LIBRARY_PATH".to_string(), ld_library_path.clone());
env.insert("DYLD_LIBRARY_PATH".to_string(), ld_library_path);
// NOTE: To avoid the -fno-inline errors, use /opt/gcc/bin/gcc instead of cc.
// To do so, add a symlink for cc to /opt/gcc/bin/gcc in our PATH.
// Another option would be to add the following Rust flag: -Clinker=/opt/gcc/bin/gcc
let path = std::env::var("PATH").unwrap_or_default();
env.insert("PATH".to_string(), format!("/opt/gcc/bin:{}", path));
let mut rustc_command = vec!["rustc".to_string()];
rustc_command.extend_from_slice(&rustflags);
rustc_command.extend_from_slice(&[
"-L".to_string(),
"crate=target/out".to_string(),
"--out-dir".to_string(),
"target/out".to_string(),
]);
Ok(ConfigInfo {
target,
target_triple,
rustc_command,
})
}
|
