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Auto merge of #43260 - zackmdavis:print_target_spec_json_unstable_options_error, r=arielb1

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explanatory error on `--print target-spec-json` without unstable options

![unstable_target_spec](https://user-images.githubusercontent.com/1076988/28243342-9731a45c-697a-11e7-9852-bad7ca1802b7.png)

Resolves #41683.
This commit is contained in:
bors 2017-07-20 06:38:41 +00:00
commit 381d51dc49
1 changed files with 9 additions and 2 deletions
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11
src/librustc/session/config.rs
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@ -1615,8 +1615,15 @@ pub fn build_session_options_and_crate_config(matches: &getopts::Matches)
"target-features" => PrintRequest::TargetFeatures,
"relocation-models" => PrintRequest::RelocationModels,
"code-models" => PrintRequest::CodeModels,
"target-spec-json" if nightly_options::is_unstable_enabled(matches)
=> PrintRequest::TargetSpec,
"target-spec-json" => {
if nightly_options::is_unstable_enabled(matches) {
PrintRequest::TargetSpec
} else {
early_error(error_format,
&format!("the `-Z unstable-options` flag must also be passed to \
enable the target-spec-json print option"));
}
},
req => {
early_error(error_format, &format!("unknown print request `{}`", req))
}