[cfe-dev] Macro expansion

[Nagaraju Mekala via cfe-dev]

Hi Nathan James,

Thanks for the reply.
I just want 16/4. Is there any way to get that other than using
clang::MacroInfo getReplacementToken()

Thanks,
Nagaraju

On Sun, May 31, 2020 at 4:28 PM Nathan James <n.james93 at hotmail.co.uk> wrote:
>
> Hi,
>
> Unfortunately the pre processor amounts to not much more than text
> manipulation and as such it won't evaluate expressions. In your example
> `C` will hold the value `16/4`. If you want to have more than that,
> then you will likely need to add a pre-build step to your build
> process, Similar(but very different) to TableGen.
>
> Regards,
> Nathan James
>
> On Sun, 2020-05-31 at 15:43 +0530, Nagaraju Mekala via cfe-dev wrote:
> > Hello All,
> >
> > I have a situation to expand a macro and I have succeeded by
> > extracting a constant value using clang::MacroInfo
> > getReplacementToken(0)
> > But if a user gives a expression then how can we evaluate the macro
> > value?
> >
> > ex:
> > #define S 16
> > #define O 4
> > #define C S/O
> >
> > In the above example I need the evaluate S/O expression and use the
> > value for my processing.
> > Can someone point how can we do this?
> >
> > Thanks in advance.
> >
> > -Nagaraju
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>