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Auto merge of #35129 - tmiasko:suggest-print-target-list, r=nagisa

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Suggest use of `--print target-list` when target is not found.

If given target could not be found suggest using `--print target-list`.
Previously, error has been reported as:

$ rustc --target 86-unknown-linux-gnu
error: Error loading target specification: Could not find specification for target "86-unknown-linux-gnu"

After changes it looks as follows:

$ rustc --target 86-unknown-linux-gnu
error: Error loading target specification: Could not find specification for target "x86-unknown-linux-gnu". Use `--print target-list` for a list of supported targets
This commit is contained in:
bors 2016-07-31 05:54:19 -07:00 committed by GitHub
commit 5556554e25
1 changed files with 5 additions and 2 deletions
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7
src/librustc/session/config.rs
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@ -30,7 +30,7 @@
use syntax::parse::token::InternedString;
use syntax::feature_gate::UnstableFeatures;
use errors::{ColorConfig, Handler};
use errors::{ColorConfig, FatalError, Handler};
use getopts;
use std::collections::HashMap;
@ -836,7 +836,10 @@ pub fn build_target_config(opts: &Options, sp: &Handler) -> Config {
let target = match Target::search(&opts.target_triple) {
Ok(t) => t,
Err(e) => {
panic!(sp.fatal(&format!("Error loading target specification: {}", e)));
sp.struct_fatal(&format!("Error loading target specification: {}", e))
.help("Use `--print target-list` for a list of built-in targets")
.emit();
panic!(FatalError);
}
};