diff options
| -rw-r--r-- | src/librustc/session/config.rs | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs index 5661c412302..2a790d0f61e 100644 --- a/src/librustc/session/config.rs +++ b/src/librustc/session/config.rs @@ -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)) } |