[Lazarus] Compiler Options - Conditionally add a package dependency?

[Michael Van Canneyt]

On Thu, 9 Jul 2015, Marcos Douglas wrote:

> On Thu, Jul 9, 2015 at 2:58 PM, Michael Van Canneyt
> <michael at freepascal.org> wrote:
>>
>>
>> On Thu, 9 Jul 2015, Marcos Douglas wrote:
>>
>>> On Thu, Jul 9, 2015 at 12:58 PM, Michael Van Canneyt
>>> <michael at freepascal.org> wrote:
>>>>
>>>>
>>>>
>>>> On Thu, 9 Jul 2015, Graeme Geldenhuys wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I have two independent packages. I would like my project to toggle
>>>>> between either one (but never both at the same time). Both have a unit
>>>>> with the exact same name, hence both packages can't be added to the
>>>>> dependency list at the same time.
>>>>>
>>>>> Is there a way with the Compiler Options -> Other (or Additions and
>>>>> Overrides) to include a specific package based on a compiler define?
>>>>>
>>>>> eg:
>>>>>  if defined UsePackageA
>>>>>    PackageDependecy.Add(PackageA)
>>>>>  else
>>>>>    PackageDependency.Add(PackageB)
>>>>>
>>>>> Well something like that at least.
>>>>
>>>>
>>>>
>>>> I would even go further, and have a package included or not depending on
>>>> the
>>>> OS.
>>>> Similar, I think it should be possible to include a unit in a package,
>>>> depending on the OS.
>>>>
>>>> In short, a set of conditions for package dependencies and contains
>>>> lists.
>>>
>>>
>>> I would even go further even more:
>>> If we have two units with the same name, would be better if were
>>> possible to create an alias namespace for each unit, like C# does.
>>>
>>> https://msdn.microsoft.com/en-us/library/aa664765(v=vs.71).aspx
>>>
>>> But you, guys, will talk about "an Unit is a namespace" -- we know
>>> this is true -- and this is not necessary... anyway.
>>
>>
>> This is not correct.
>>
>> We have support for dotted unit names. The only thing missing is a namespace
>> directive.
>
> I know we have support for dotted unit names -- and this is not so
> important, ie, what the difference between MyUnitName to my.unit.name?
> -- the real problem, IMHO, is the names collisions between packages.

I repeat:
"The only thing missing is a namespace directive."

And then you have what you need.

Michael.