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Auto merge of #123546 - Rajveer100:branch-for-issue-122128, r=onur-ozkan
Bootstrap: Check validity of `--target` and `--host` triples before starting a build
Resolves #122128
As described in the issue, validating the `target` and `host` triples would save a lot of time before actually starting a build. This would also check for custom targets by looking for a valid JSON spec if the specified target does not exist in the [supported](42825768b1/compiler/rustc_target/src/spec/mod.rs (L1401-L1689)
) list of targets.
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commit
6c90ac8d8f
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@ -14,6 +14,7 @@ use std::ffi::{OsStr, OsString};
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use std::fs;
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use std::path::PathBuf;
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use std::process::Command;
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use walkdir::WalkDir;
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use crate::builder::Kind;
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use crate::core::config::Target;
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@ -177,6 +178,34 @@ than building it.
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continue;
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}
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// Check if there exists a built-in target in the list of supported targets.
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let mut has_target = false;
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let target_str = target.to_string();
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let supported_target_list =
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output(Command::new(&build.config.initial_rustc).args(["--print", "target-list"]));
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has_target |= supported_target_list.contains(&target_str);
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// If not, check for a valid file location that may have been specified
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// by the user for the custom target.
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if let Some(custom_target_path) = env::var_os("RUST_TARGET_PATH") {
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let mut target_os_str = OsString::from(&target_str);
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target_os_str.push(".json");
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// Recursively traverse through nested directories.
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let walker = WalkDir::new(custom_target_path).into_iter();
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for entry in walker.filter_map(|e| e.ok()) {
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has_target |= entry.file_name() == target_os_str;
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}
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}
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if !has_target && !["A", "B", "C"].contains(&target_str.as_str()) {
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panic!(
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"No such target exists in the target list,
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specify a correct location of the JSON specification file for custom targets!"
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);
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}
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if !build.config.dry_run() {
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cmd_finder.must_have(build.cc(*target));
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if let Some(ar) = build.ar(*target) {
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