We need our code to be compiled with Delphi and FPC.
So we can use some subset of language features. We should decide which.
FPC in Delphi mode doesn't support all the features of latest versions (and probably never will).
Personally I'm satisfied with Delphi 7 language features, plus:
1. unicode (D2009, FPC 2.6.2)
2. generics (D2009, FPC 2.6.2)
3. unit namespaces (D2007, FPC 2.7.1)
As I know generics are usable starting from Delphi XE.
We'll need to test various code with generics to check if FPC and Delphi are consistent on that.
And I'd to avoid usage of ifdefs or separate units where possible.
Stable FPC 2.6.2 is very old.
FPC 2.7.1 is pretty stable.
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