[cfe-dev] Macro expansion with Clang

[Richard Smith]

On Mon, Oct 14, 2013 at 9:48 PM, Alexander Basov <coopht at gmail.com> wrote:

> Hello.
> Could somebody help me with macro expansion?
>
> I have a header with the following macroses defined:
>
> #define foo(x) x + 2
> #define A 1
> #define B foo(A)
>
> And I need get the following map:
> A = 1
> B = 3
>
> How can I do it?
>

One way:

#include "your_header.h"

int main() {
  printf("A = %d\nB = %d\n", A, B);
  return 0;
}

What additional constraints do you have? Do you need to do this using the
Clang C++ API for some reason? Do you know in advance the names of the
macros that you want to evaluate?

I'm ale to get list of MacroInfo * classes with PPCallbacks or get it with
> Preprocessor::macro_begin() iterator, but I don't know how to get expaneded
> value.
>
> Thank you in advance.
>
> --
> Alexander
>
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>
>
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