[Patch] Add a cl.exe compatible driver mode

[Hans Wennborg]

Thanks! r186720.

On Fri, Jul 19, 2013 at 11:55 AM, Reid Kleckner <rnk at google.com> wrote:
> LGTM
>
>
> On Fri, Jul 19, 2013 at 2:51 PM, Hans Wennborg <hans at chromium.org> wrote:
>>
>> On Fri, Jul 19, 2013 at 11:39 AM, Reid Kleckner <rnk at google.com> wrote:
>> > +  /// Whether the drvier was invoked as a C++ compiler
>> > +  /// (e.g. clang++ or clang-cl).
>> > +  bool CCCIsCXX() const { return Mode == GXXMode || Mode == CLMode; }
>> >
>> > Looks good, but what needs this?  My understanding is that all of clang,
>> > cl,
>> > and gcc can be invoked on .c or .cpp files and they will auto-detect the
>> > language from the extension.  The main behavior difference is whether to
>> > link the standard C++ library.
>>
>> I think the mode overrides the auto-detection though, e.g. "clang++
>> a.c" will treat the file as c++ (and warn about it).
>>
>> Checking for CLMode here probably doesn't make sense actually, I'll revert
>> it.
>>
>> New patch attached.
>>
>>  - Hans
>>
>> > On Fri, Jul 19, 2013 at 2:31 PM, Hans Wennborg <hans at chromium.org>
>> > wrote:
>> >>
>> >> Hi all,
>> >>
>> >> The attached patch adds a cl.exe compatible mode to the driver. It
>> >> doesn't actually do anything yet, but the plan is to make it accept
>> >> cl.exe style command line flags as discussed in [1].
>> >>
>> >> Please take a look!
>> >>
>> >> Thanks,
>> >> Hans
>> >>
>> >> [1]. http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-June/030439.html
>
>