bendns' repos / rust-analyzer
Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/project-model/src/target_triple.rs')
-rw-r--r--crates/project-model/src/target_triple.rs82
1 files changed, 82 insertions, 0 deletions
diff --git a/crates/project-model/src/target_triple.rs b/crates/project-model/src/target_triple.rs
new file mode 100644
index 0000000000..92e0c49885
--- /dev/null
+++ b/crates/project-model/src/target_triple.rs
@@ -0,0 +1,82 @@
+//! Runs `rustc --print -vV` to get the host target.
+use anyhow::Context;
+use rustc_hash::FxHashMap;
+use toolchain::Tool;
+
+use crate::{utf8_stdout, ManifestPath, Sysroot};
+
+pub(super) enum TargetTipleConfig<'a> {
+ #[expect(dead_code)]
+ Rustc(&'a Sysroot),
+ Cargo(&'a Sysroot, &'a ManifestPath),
+}
+
+pub(super) fn get(
+ config: TargetTipleConfig<'_>,
+ target: Option<&str>,
+ extra_env: &FxHashMap<String, String>,
+) -> anyhow::Result<Vec<String>> {
+ if let Some(target) = target {
+ return Ok(vec![target.to_owned()]);
+ }
+
+ let sysroot = match config {
+ TargetTipleConfig::Cargo(sysroot, cargo_toml) => {
+ match cargo_config_build_target(cargo_toml, extra_env, sysroot) {
+ Ok(it) => return Ok(it),
+ Err(e) => {
+ tracing::warn!("failed to run `cargo rustc --print cfg`, falling back to invoking rustc directly: {e}");
+ sysroot
+ }
+ }
+ }
+ TargetTipleConfig::Rustc(sysroot) => sysroot,
+ };
+ rustc_discover_host_triple(extra_env, sysroot).map(|it| vec![it])
+}
+
+fn rustc_discover_host_triple(
+ extra_env: &FxHashMap<String, String>,
+ sysroot: &Sysroot,
+) -> anyhow::Result<String> {
+ let mut rustc = sysroot.tool(Tool::Rustc);
+ rustc.envs(extra_env);
+ rustc.arg("-vV");
+ tracing::debug!("Discovering host platform by {:?}", rustc);
+ let stdout = utf8_stdout(rustc).context("Failed to discover host platform")?;
+ let field = "host: ";
+ let target = stdout.lines().find_map(|l| l.strip_prefix(field));
+ if let Some(target) = target {
+ Ok(target.to_owned())
+ } else {
+ // If we fail to resolve the host platform, it's not the end of the world.
+ Err(anyhow::format_err!("rustc -vV did not report host platform, got:\n{}", stdout))
+ }
+}
+
+fn cargo_config_build_target(
+ cargo_toml: &ManifestPath,
+ extra_env: &FxHashMap<String, String>,
+ sysroot: &Sysroot,
+) -> anyhow::Result<Vec<String>> {
+ let mut cargo_config = sysroot.tool(Tool::Cargo);
+ cargo_config.envs(extra_env);
+ cargo_config
+ .current_dir(cargo_toml.parent())
+ .args(["-Z", "unstable-options", "config", "get", "build.target"])
+ .env("RUSTC_BOOTSTRAP", "1");
+ // if successful we receive `build.target = "target-triple"`
+ // or `build.target = ["<target 1>", ..]`
+ tracing::debug!("Discovering cargo config target by {:?}", cargo_config);
+ utf8_stdout(cargo_config).and_then(parse_output_cargo_config_build_target)
+}
+
+fn parse_output_cargo_config_build_target(stdout: String) -> anyhow::Result<Vec<String>> {
+ let trimmed = stdout.trim_start_matches("build.target = ").trim_matches('"');
+
+ if !trimmed.starts_with('[') {
+ return Ok([trimmed.to_owned()].to_vec());
+ }
+
+ serde_json::from_str(trimmed).context("Failed to parse `build.target` as an array of target")
+}