diff options
Diffstat (limited to 'compiler/rustc_driver/src')
| -rw-r--r-- | compiler/rustc_driver/src/lib.rs | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/compiler/rustc_driver/src/lib.rs b/compiler/rustc_driver/src/lib.rs index 35a6495946f..2ad2820fac0 100644 --- a/compiler/rustc_driver/src/lib.rs +++ b/compiler/rustc_driver/src/lib.rs @@ -29,7 +29,7 @@ use rustc_middle::middle::cstore::MetadataLoader; use rustc_save_analysis as save; use rustc_save_analysis::DumpHandler; use rustc_serialize::json::{self, ToJson}; -use rustc_session::config::nightly_options; +use rustc_session::config::{nightly_options, CG_OPTIONS, DB_OPTIONS}; use rustc_session::config::{ErrorOutputType, Input, OutputType, PrintRequest, TrimmedDefPaths}; use rustc_session::getopts; use rustc_session::lint::{Lint, LintId}; @@ -1017,9 +1017,18 @@ pub fn handle_options(args: &[String]) -> Option<getopts::Matches> { for option in config::rustc_optgroups() { (option.apply)(&mut options); } - let matches = options - .parse(args) - .unwrap_or_else(|f| early_error(ErrorOutputType::default(), &f.to_string())); + let matches = options.parse(args).unwrap_or_else(|e| { + let msg = match e { + getopts::Fail::UnrecognizedOption(ref opt) => CG_OPTIONS + .iter() + .map(|&(name, ..)| ('C', name)) + .chain(DB_OPTIONS.iter().map(|&(name, ..)| ('Z', name))) + .find(|&(_, name)| *opt == name.replace("_", "-")) + .map(|(flag, _)| format!("{}. Did you mean `-{} {}`?", e, flag, opt)), + _ => None, + }; + early_error(ErrorOutputType::default(), &msg.unwrap_or_else(|| e.to_string())); + }); // For all options we just parsed, we check a few aspects: // |