[PATCH] D41733: [Driver] Suggest correctly spelled driver options

Brian Gesiak via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Thu Jan 4 10:07:53 PST 2018

modocache created this revision.
modocache added reviewers: yamaguchi, v.g.vassilev, teemperor, ruiu.

Depends on https://reviews.llvm.org/D41732.

Utilities such as `opt`, when invoked with arguments that are very
nearly spelled correctly, suggest the correctly spelled options:

  bin/opt -hel
  opt: Unknown command line argument '-hel'.  Try: 'bin/opt -help'
  opt: Did you mean '-help'?

Clang, on the other hand, prior to this commit, does not:

  bin/clang -hel
  clang-6.0: error: unknown argument: '-hel'

This commit makes use of the new libLLVMOption API from
https://reviews.llvm.org/D41732 in order to provide correct suggestions:

  bin/clang -hel
  clang-6.0: error: unknown argument: '-hel', did you mean '-help'?

Test Plan: `check-clang`

  rC Clang



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