aaron.ballman added inline comments.
================
Comment at: lib/Parse/ParseDecl.cpp:2973
+ // recognize that scenario and recover gracefully.
+ if (!getLangOpts().MicrosoftExt && Tok.is(tok::identifier) &&
+ Tok.getIdentifierInfo()->getName().equals("__declspec")) {
----------------
compnerd wrote:
> Shouldn't this be `getLangOpts().DeclSpecKeyword` since you don't need the
> Microsoft extensions as much as you need the declspec keyword to be
> processed. Having `MicrosoftExt` implicitly enable `DeclSpecKeyword` (just
> as borland mode enables it as well). I suppose that it would fail anyways as
> `Tok.is(tok::identifier)` would fail.
That's a good point, I've corrected.
================
Comment at: lib/Parse/ParseDecl.cpp:2989
+
+ Diag(Loc, diag::err_ms_attributes_not_enabled);
+ continue;
----------------
compnerd wrote:
> I think that we want to emit the diagnostic even if there is no parenthesis
> as `__declspec` is a reserved identifier, and we would normally diagnose the
> bad `__declspec` (expected '(' after '__declspec').
Yes, but it could also lead to a rejecting code that we used to accept and
properly handle when __declspec is an identifier rather than a keyword. e.g.,
```
struct __declspec {};
__declspec some_func(void);
```
By looking for the paren, we run less risk of breaking working code, even if
that code abuses the implementation namespace (after all, __declspec it not a
keyword in this scenario).
https://reviews.llvm.org/D29868
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