Bad diagnostic after `--`: `no such file or directory X, did you mean X`

[HolyBlackCat]

A little diagnostic bug.

If you do clang++ -- -fsyntax-only, Clang says:

error: no such file or directory: '-fsyntax-only'; did you mean '-fsyntax-only'?

It shouldn't do this for obvious reasons. did you mean '-some-flag' should only trigger for parameters before the --.

Tested on Clang 20 and trunk.

[llvmbot]

@llvm/issue-subscribers-clang-driver

Author: Egor (HolyBlackCat)

A little diagnostic bug.

If you do clang++ -- -fsyntax-only, Clang says:

error: no such file or directory: '-fsyntax-only'; did you mean '-fsyntax-only'?

It shouldn't do this for obvious reasons. did you mean '-some-flag' should only trigger for parameters before the --.

Tested on Clang 20 and trunk.

[AaronBallman]

https://godbolt.org/z/o6WYY8Tr3 shows the issue in action