[cfe-dev] Leave conditional directives untouched by Preprocessor

João Matos ripzonetriton at gmail.com
Tue Jul 17 05:54:55 PDT 2012

Take a look at Lex/PPCallbacks.h.

On Mon, Jul 16, 2012 at 11:33 PM, Ivan <ivanhoe12 at gmail.com> wrote:
> Hello everyone!
> I'm experimenting on Clang trying to build some specific C preprocessor.
> One thing I don't want him to do is to process conditional directives.
> For example if there is such an expression in the code:
>     int i = 1;
>   #else
>     int i = 2;
>   #endif
> a normal preprocessor will process it to "int i = 1;" or "int i = 2;"
> depending
> on condition. But I want my preprocessor to leave this expression untouched.
> I want to ask what is the best way to do this? Is there some option for
> Preprocessor or PreprocessorLexer or Lexer class? I've looked through their
> code but did't find nothing which can help in this case (I don't want to
> modify their code because I want my program to work with vanilla Clang).
> Now I'm going to make a derived class of Preprocessor (or Lexer) and
> override
> appropriate methods. But maybe there is more simple and elegant solution.
> Thanks,
> Ivan.
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João Matos

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