[cfe-commits] [PATCH] #import directive in MS compatibility mode

Douglas Gregor dgregor at apple.com
Sat Mar 17 17:14:51 PDT 2012

On Mar 17, 2012, at 5:11 PM, Aaron Ballman wrote:

> On Sat, Mar 17, 2012 at 7:03 PM, Douglas Gregor <dgregor at apple.com> wrote:
>> On Mar 17, 2012, at 5:00 PM, Aaron Ballman wrote:
>>> On Thu, Mar 15, 2012 at 7:29 AM, Aaron Ballman <aaron at aaronballman.com> wrote:
>>>> On Wed, Mar 14, 2012 at 11:25 PM, J B <jayblanchard.cpp at gmail.com> wrote:
>>>>> The reason I recommend an error is because the code will error out later
>>>>> without the .tlh (where it is requested via attributes or absence of).  The
>>>>> errors later will be a direct result of the failure of #import to function
>>>>> properly.
>>>> That's a valid reason to error in my book.  I'll go down that route.
>>>> Thanks for the insights!
>>> This is the revised patch based on feedback from everyone.  It causes
>>> a (shorter) error to happen when using #import in MS mode, and does
>>> not perform the actual include.  It also eats the optional attributes
>>> so that parsing can continue.
>>> Again, this will fix PR 10727
>> +def err_pp_import_directive_ms : Error<
>> +  "#import does not convert a type library to C++ classes in Microsoft Mode">,
>> +  InGroup<Microsoft>;
>> This should really just say that this Microsoft feature is not implemented.
>> -  if (!LangOpts.ObjC1)  // #import is standard for ObjC.
>> +  if (LangOpts.MicrosoftMode)
>> +    return HandleMicrosoftImportDirective(ImportTok);
>> +  else if (!LangOpts.ObjC1)  // #import is standard for ObjC.
>>     Diag(ImportTok, diag::ext_pp_import_directive);
>> I think we should do this the other way: if LangOpts.ObjC1, we treat it as an Objective-C #import. Otherwise, we either error (if in Microsoft mode) or give an extension warning (not in Microsoft mode).
> Good points -- rectified in this patch.

Last complaint, but otherwise LGTM:

+def err_pp_import_directive_ms : Error<
+  "this Microsoft feature is not implemented">,
+  InGroup<Microsoft>;

How about "#import of type library is an unsupported Microsoft feature"

	- Doug

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