#ifdef vs #if for feature checks

[Michael Stahl]

On 19/03/13 16:25, Christian Lohmaier wrote:
> Hi Tor, *,
> 
> On Tue, Mar 19, 2013 at 6:51 AM, Tor Lillqvist <tml at iki.fi> wrote:
>>> otoh, #pragma once is supported by all the compiler we use isn't it ?
>>
>> Excellent! Let's do that, unless somebody comes up with a
>> counter-argument in a week or so.
> 
> This doesn't help when the same file is used from two different
> locations, let's say from solver and the module (should not happen,
> but...)

we want to kill the "delivering" of headers anyway, so (with possible
exception of URE headers) this problem will go away if it even exists now.