[Option] For typo '-foo', suggest '--foo'
Summary:
https://reviews.llvm.org/rL321877 introduced the `OptTable::findNearest`
method, to find the closest edit distance option for a given string.
However, the implementation contained a bug: for a typo `-foo` with an
edit distance of 1 away from a valid option `--foo`, `findNearest`
would suggest a nearby option of `foo`. That is, the result would not
include the `--` prefix, and so was not a valid option.
Fix the bug by ensuring that the prefix string is initialized to one of
the valid prefixes for the option.
Test Plan: `check-llvm-unit`
Reviewers: v.g.vassilev, teemperor, ruiu, jroelofs, yamaguchi
Reviewed By: jroelofs
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D41873
llvm-svn: 322109
GitOrigin-RevId: d481df53104d0da83924075b9a0f15024d6232ef
diff --git a/unittests/Option/Opts.td b/unittests/Option/Opts.td
index 539850d..c4544b5 100644
--- a/unittests/Option/Opts.td
+++ b/unittests/Option/Opts.td
@@ -34,4 +34,5 @@
def Doopf1 : Flag<["-"], "doopf1">, HelpText<"The doopf1 option">, Flags<[OptFlag1]>;
def Doopf2 : Flag<["-"], "doopf2">, HelpText<"The doopf2 option">, Flags<[OptFlag2]>;
def Ermgh : Joined<["--"], "ermgh">, HelpText<"The ermgh option">, MetaVarName<"ERMGH">, Flags<[OptFlag1]>;
+def Fjormp : Flag<["--"], "fjormp">, HelpText<"The fjormp option">, Flags<[OptFlag1]>;
def DashDash : Option<["--"], "", KIND_REMAINING_ARGS>;
