How to write and use chained PCHs

[Eli Friedman]

You might be able to load them... but you won't be able to do anything
useful with them: PCH doesn't include an appropriate semantic model to
avoid issues like the redefinitions you ran into.  The correct semantic
model is modules... see http://clang.llvm.org/docs/Modules.html .

-Eli


On Tue, Aug 13, 2013 at 5:49 PM, Yao SHEN <yaoshen at andrew.cmu.edu> wrote:

>  It seems I can use multiple PCH files to parse. I replace #include .h
> with PCH loading in PPCallback. I have successfully loaded multiple PCH
> files in that way.
>
> -Yao
>
> On  Tue, Aug 13, 2013 at 8:27 PM, Eli Friedman <eli.friedman at gmail.com><eli.friedman at gmail.com>
>  wrote:
>
>
>  On Tue, Aug 13, 2013 at 5:21 PM, Yao SHEN <yaoshen at andrew.cmu.edu> wrote:
>
>>  I want to try in following way. Would you please check if it is
>> feasible for me?
>>
>> 1. For each .h file, I generate one PCH file;
>>
>
>  This is already not feasible.  I mean, you can generate the files, but
> you can't use multiple PCH files together to compile a .cpp file.
>
>  -Eli
>
>
>
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