[cfe-dev] Late Parsed Template support for PCH

[Francois Pichet]

Hi, I implemented the original -fdelayed-template-parsing mode and I simply
did not consider PCH during the design/implementation. As it is currently
this should output an error instead of creating an incomplete AST.

Feel free to add support for fdelayed-template-parsing + PCH.
I never looked at the PCH part of clang so I got no advice really.



On Wed, Jul 24, 2013 at 12:18 PM, Will Wilson <will at indefiant.com> wrote:

> Hi All,
>
> I've discovered a rather nasty issue with -fdelayed-template-parsing
> enabled. If this is used to build a PCH all of the stored template tokens
> are lost leading an incomplete AST when the PCH is used to create the
> complete TU.
>
> Is this by design or a missing feature for the serialization code?
>
> Unfortunately, due to a huge body of MSVC targeted code and a need to use
> PCH files to maintain acceptable performance I need to make this work
> seamlessly. The data that would need preserving is currently stored in the
> Parser and is a map of const FunctionDecl* to LateParsedTemplatedFunction*.
> The LateParsedTemplatedFunction is essentially a SmallVector of Tokens.
>
> Before I dive in and attempt to add support for serializing this, is there
> anything I should know?
>
> Cheers,
> Will.
>
> --
> *Indefiant Ltd.*
>
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