[cfe-dev] Tooling vs -fdelayed-template-parsing WAS: Clang-cl.exe and the VC++ preprocessor

[Kim Gräsman]

On Mon, Aug 4, 2014 at 7:34 PM, Reid Kleckner <rnk at google.com> wrote:

> On Mon, Aug 4, 2014 at 10:26 AM, Kim Gräsman <kim.grasman at gmail.com>
> wrote:
>
>>
>> We just (a few minutes ago, while experimenting with this) found a case
>> where late-parsing a template whose body contains undefined symbols would
>> generate an incomplete AST, e.g.
>>
>> template<class T>
>> void foo(const T& t) {
>>   UndefinedSymbol::bar(t);  // colon-colon
>> }
>>
>> $ clang-check.exe -ast-dump incomplete.cpp --
>> -fno-delayed-template-parsing
>> TranslationUnitDecl 0xebe7e0 <<invalid sloc>> <invalid sloc>
>> [...]
>> This runs without error [...]
>>
>> I don't know if this is a general bug in the parser, but it'd be nice to
>> always get a diagnostic here.
>>
>
> This is an -fms-compatibility hack, which is separate from delayed
> template parsing.  I'm surprised we don't have a -Wmicrosoft warning here,
> though.
>

Thanks, that explains it. I'm about to take off on a road-trip, or I'd
offer to add a warning. If you can give me a hint as to where to start I
may be able to get to it when we get back.

- Kim
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