diff --git a/compiler/rustc_driver_impl/src/lib.rs b/compiler/rustc_driver_impl/src/lib.rs index 627a0ebb4e5e3..fa1b8e7c83497 100644 --- a/compiler/rustc_driver_impl/src/lib.rs +++ b/compiler/rustc_driver_impl/src/lib.rs @@ -1221,17 +1221,30 @@ pub fn handle_options(early_dcx: &EarlyDiagCtxt, args: &[String]) -> Option = match e { getopts::Fail::UnrecognizedOption(ref opt) => CG_OPTIONS .iter() .map(|&(name, ..)| ('C', name)) .chain(Z_OPTIONS.iter().map(|&(name, ..)| ('Z', name))) .find(|&(_, name)| *opt == name.replace('_', "-")) .map(|(flag, _)| format!("{e}. Did you mean `-{flag} {opt}`?")), + getopts::Fail::ArgumentMissing(ref opt) => { + optgroups.iter().find(|option| option.name == opt).map(|option| { + // Print the help just for the option in question. + let mut options = getopts::Options::new(); + (option.apply)(&mut options); + // getopt requires us to pass a function for joining an iterator of + // strings, even though in this case we expect exactly one string. + options.usage_with_format(|it| { + it.fold(format!("{e}\nUsage:"), |a, b| a + "\n" + &b) + }) + }) + } _ => None, }; early_dcx.early_fatal(msg.unwrap_or_else(|| e.to_string())); diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs index f58a991a616da..6699fd8332ba0 100644 --- a/compiler/rustc_session/src/config.rs +++ b/compiler/rustc_session/src/config.rs @@ -1349,7 +1349,7 @@ enum OptionStability { pub struct RustcOptGroup { pub apply: Box &mut getopts::Options>, - name: &'static str, + pub name: &'static str, stability: OptionStability, } diff --git a/tests/ui/invalid-compile-flags/print-without-arg.rs b/tests/ui/invalid-compile-flags/print-without-arg.rs new file mode 100644 index 0000000000000..a762cb22275ee --- /dev/null +++ b/tests/ui/invalid-compile-flags/print-without-arg.rs @@ -0,0 +1 @@ +//@ compile-flags: --print diff --git a/tests/ui/invalid-compile-flags/print-without-arg.stderr b/tests/ui/invalid-compile-flags/print-without-arg.stderr new file mode 100644 index 0000000000000..a18d2779cade9 --- /dev/null +++ b/tests/ui/invalid-compile-flags/print-without-arg.stderr @@ -0,0 +1,5 @@ +error: Argument to option 'print' missing + Usage: + --print [crate-name|file-names|sysroot|target-libdir|cfg|check-cfg|calling-conventions|target-list|target-cpus|target-features|relocation-models|code-models|tls-models|target-spec-json|all-target-specs-json|native-static-libs|stack-protector-strategies|link-args|deployment-target] + Compiler information to print on stdout +