#ifdef vs #if for feature checks

[Noel Grandin]

On Fri, Mar 15, 2013 at 5:58 PM, Lubos Lunak <l.lunak at suse.cz> wrote:

>
>  The problem with this change is that there still may be some cases where
> #ifdef is used, either because some system #defines work that way (so those
> would be valid but different), or people would still use #ifdef out of
> habbit
>

I like the general idea.
Perhaps we could build a small whitelist of the values for which #ifdef is
allowed?
There can't be very many of them.
Then the mechanical checker can become part of the toolkit we use to keep
the codebase sane.
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