Compile time filesystem access?

[Manu]

On 30 January 2012 18:11, bls <bizprac at orange.fr> wrote:

> On 01/30/2012 07:18 AM, Adam D. Ruppe wrote:
>
>> On Monday, 30 January 2012 at 14:24:32 UTC, Manu wrote:
>>
>>> I want to know if a library is present, and automatically disable
>>> non-vital features if it isn't.
>>>
>>
>> I'd like it too... here's what I tried. It doesn't
>> work, though.
>>
>
> I am afraid I miss the point but shouldn't module ctors help.. f.i.
>
> module m;
> import std.file;
> static this()  // module ctor
> {
>        if ("/usr/share/include/my.lib".**isDir)
>                import my;
>        else
>                import other;
>
> }
>
> Not tested!
>

That looks like a runtime test, and would still require both libs being
present to link. I'm talking about detection at compile time.

For example, I have a sound API here atm, the it supports mp3, vorbis,
flac, wma, etc, but not all of those libraries are available for all
platforms I build for.
What I need to do is know in advance what platforms have which libs
available, and then do a bunch of platform checks to decide which should or
shouldn't be present.
Further more, if a lib is *available* for a given platform, but I don't
want to use it, or don't want to install/build the lib, I need to edit the
code... If I could detect presence of the lib, I can just gracefully remove
the feature.
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