# rustc to execute.
#lld = false
+# Indicates whether LLD will be used to link Rust crates during bootstrap on
+# supported platforms. The LLD from the bootstrap distribution will be used
+# and not the LLD compiled during the bootstrap.
+#use-lld = false
+
# Indicates whether some LLVM tools, like llvm-objdump, will be made available in the
# sysroot.
#llvm-tools = false
cmd.arg(format!("-Clinker={}", host_linker));
}
+ // Override linker flavor if necessary.
+ if let Ok(host_linker_flavor) = env::var("RUSTC_HOST_LINKER_FLAVOR") {
+ cmd.arg(format!("-Clinker-flavor={}", host_linker_flavor));
+ }
+
if let Ok(s) = env::var("RUSTC_HOST_CRT_STATIC") {
if s == "true" {
cmd.arg("-C").arg("target-feature=+crt-static");
cmd.env_remove("MAKEFLAGS");
cmd.env_remove("MFLAGS");
- if let Some(linker) = self.linker(compiler.host) {
+ if let Some(linker) = self.linker(compiler.host, true) {
cmd.env("RUSTC_TARGET_LINKER", linker);
}
cmd
}
}
- if let Some(host_linker) = self.linker(compiler.host) {
+ // FIXME: Don't use LLD if we're compiling libstd, since it fails to link it.
+ let can_use_lld = mode != Mode::Std;
+
+ // FIXME: The beta compiler doesn't pick the `lld-link` flavor for `*-pc-windows-msvc`
+ // Remove `RUSTC_HOST_LINKER_FLAVOR` when this is fixed
+ let lld_linker_flavor = |linker: &Path, target: Interned<String>| {
+ compiler.stage == 0
+ && linker.file_name() == Some(OsStr::new("rust-lld"))
+ && target.contains("pc-windows-msvc")
+ };
+
+ if let Some(host_linker) = self.linker(compiler.host, can_use_lld) {
+ if lld_linker_flavor(host_linker, compiler.host) {
+ cargo.env("RUSTC_HOST_LINKER_FLAVOR", "lld-link");
+ }
+
cargo.env("RUSTC_HOST_LINKER", host_linker);
}
- if let Some(target_linker) = self.linker(target) {
+
+ if let Some(target_linker) = self.linker(target, can_use_lld) {
+ if lld_linker_flavor(target_linker, target) {
+ rustflags.arg("-Clinker-flavor=lld-link");
+ }
+
let target = crate::envify(&target);
cargo.env(&format!("CARGO_TARGET_{}_LINKER", target), target_linker);
}
pub llvm_use_linker: Option<String>,
pub llvm_allow_old_toolchain: Option<bool>,
+ pub use_lld: bool,
pub lld_enabled: bool,
pub lldb_enabled: bool,
pub llvm_tools_enabled: bool,
save_toolstates: Option<String>,
codegen_backends: Option<Vec<String>>,
lld: Option<bool>,
+ use_lld: Option<bool>,
llvm_tools: Option<bool>,
lldb: Option<bool>,
deny_warnings: Option<bool>,
if let Some(true) = rust.incremental {
config.incremental = true;
}
+ set(&mut config.use_lld, rust.use_lld);
set(&mut config.lld_enabled, rust.lld);
set(&mut config.lldb_enabled, rust.lldb);
set(&mut config.llvm_tools_enabled, rust.llvm_tools);
hosts: Vec<Interned<String>>,
targets: Vec<Interned<String>>,
- // Stage 0 (downloaded) compiler and cargo or their local rust equivalents
+ // Stage 0 (downloaded) compiler, lld and cargo or their local rust equivalents
initial_rustc: PathBuf,
initial_cargo: PathBuf,
+ initial_lld: PathBuf,
// Runtime state filled in later on
// C/C++ compilers and archiver for all targets
// we always try to use git for LLVM builds
let in_tree_llvm_info = channel::GitInfo::new(false, &src.join("src/llvm-project"));
+ let initial_sysroot = config.initial_rustc.parent().unwrap().parent().unwrap();
+ let initial_lld = initial_sysroot
+ .join("lib")
+ .join("rustlib")
+ .join(config.build)
+ .join("bin")
+ .join("rust-lld");
+
let mut build = Build {
initial_rustc: config.initial_rustc.clone(),
initial_cargo: config.initial_cargo.clone(),
+ initial_lld,
local_rebuild: config.local_rebuild,
fail_fast: config.cmd.fail_fast(),
doc_tests: config.cmd.doc_tests(),
}
/// Returns the path to the linker for the given target if it needs to be overridden.
- fn linker(&self, target: Interned<String>) -> Option<&Path> {
+ fn linker(&self, target: Interned<String>, can_use_lld: bool) -> Option<&Path> {
if let Some(linker) = self.config.target_config.get(&target).and_then(|c| c.linker.as_ref())
{
Some(linker)
&& !target.contains("msvc")
{
Some(self.cc(target))
+ } else if can_use_lld
+ && self.config.use_lld
+ && target.contains("pc-windows-msvc")
+ && self.build == target
+ {
+ Some(&self.initial_lld)
} else {
None
}
.env("RUSTDOC_REAL", builder.rustdoc(self.compiler))
.env("RUSTDOC_CRATE_VERSION", builder.rust_version())
.env("RUSTC_BOOTSTRAP", "1");
- if let Some(linker) = builder.linker(self.compiler.host) {
+ if let Some(linker) = builder.linker(self.compiler.host, true) {
cmd.env("RUSTC_TARGET_LINKER", linker);
}
try_run(builder, &mut cmd);
flags.push("-Zunstable-options".to_string());
flags.push(builder.config.cmd.rustc_args().join(" "));
- if let Some(linker) = builder.linker(target) {
+ if let Some(linker) = builder.linker(target, false) {
cmd.arg("--linker").arg(linker);
}