Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/project-model/src/toolchain_info/target_triple.rs')
| -rw-r--r-- | crates/project-model/src/toolchain_info/target_triple.rs | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/crates/project-model/src/toolchain_info/target_triple.rs b/crates/project-model/src/toolchain_info/target_triple.rs new file mode 100644 index 0000000000..1c36e3863a --- /dev/null +++ b/crates/project-model/src/toolchain_info/target_triple.rs @@ -0,0 +1,75 @@ +use anyhow::Context; +use rustc_hash::FxHashMap; +use toolchain::Tool; + +use crate::{toolchain_info::QueryConfig, utf8_stdout, ManifestPath, Sysroot}; + +/// For cargo, runs `cargo -Zunstable-options config get build.target` to get the configured project target(s). +/// For rustc, runs `rustc --print -vV` to get the host target. +pub fn get( + config: QueryConfig<'_>, + target: Option<&str>, + extra_env: &FxHashMap<String, String>, +) -> anyhow::Result<Vec<String>> { + let _p = tracing::info_span!("target_triple::get").entered(); + if let Some(target) = target { + return Ok(vec![target.to_owned()]); + } + + let sysroot = match config { + QueryConfig::Cargo(sysroot, cargo_toml) => { + match cargo_config_build_target(cargo_toml, extra_env, sysroot) { + Some(it) => return Ok(it), + None => sysroot, + } + } + QueryConfig::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 cmd = sysroot.tool(Tool::Rustc); + cmd.envs(extra_env); + cmd.arg("-vV"); + let stdout = utf8_stdout(&mut cmd) + .with_context(|| format!("unable to discover host platform via `{cmd:?}`"))?; + 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, +) -> Option<Vec<String>> { + let mut cmd = sysroot.tool(Tool::Cargo); + cmd.envs(extra_env); + cmd.current_dir(cargo_toml.parent()).env("RUSTC_BOOTSTRAP", "1"); + cmd.args(["-Z", "unstable-options", "config", "get", "build.target"]); + // if successful we receive `build.target = "target-triple"` + // or `build.target = ["<target 1>", ..]` + // this might be `error: config value `build.target` is not set` in which case we + // don't wanna log the error + utf8_stdout(&mut cmd).and_then(parse_output_cargo_config_build_target).ok() +} + +// Parses `"build.target = [target-triple, target-triple, ...]"` or `"build.target = "target-triple"` +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") +} |