[Patch] clang-cl: add support for /? and /help

[Reid Kleckner]

I think we want to have a whitelist of "clang options" that are distinct
from gcc options, rather than blacklisting a troublesome few (-MD) as
GCCOptions.  That seemed to be the main conclusion of the discussion on
cfe-dev.

We obviously don't want to add Flags<[ClangOption]> to every option in
f_Group and f_clang_Group, so there'll have to be some tablegen magic in
there.

Does that seem reasonable?


On Mon, Jul 22, 2013 at 8:38 PM, Hans Wennborg <hans at chromium.org> wrote:

> Hi all,
>
> The attached patch makes clang-cl handle the /? and /help command-line
> flags.
>
> These are both just aliases to the regular -help flag, but this puts
> the code in place for accepting (and printing as part of the help
> message) different flags depending on the driver mode.
>
> Please take a look!
>
> Thanks,
> Hans
>
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