Is there a conditional define for library projects in Delphi?

Question

I have a utility unit with code shared between a few applications and DLLs. I\'d like to selectively compile portions of this unit based upon the current project type: Applicati

Answer 1

IMHO there is absolutly no need for such conditionals because of existing conventions.

Compiling an Application or Library (the same on this compiling aspect) or a Package differs like so:

• Application/Library will compile only the used parts from the unit
• Package will compile all parts from the unit referenced by the interface part of the unit

Example Unit

unit foo;

interface

procedure foo1;
procedure foo2;

implementation

procedure foo3; 
begin
  // used by foo2, compile depends on foo2 compilation
end;

procedure foo4;
begin
  // will never be compiled, because is never used
end;

procedure foo1;
begin
  // Package: will always be compiled
  // Application/Library: will be compiled if used 
end;

procedure foo2;
begin
  // Package: will always be compiled
  // Application/Library: will be compiled if used 

  foo3;

end;

end.

That is also a reason, why using packages may result in bigger exe files, because it can contain unused code parts from precompiled dcu files.