Compiler Mode

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The Free Pascal compiler will compile in a specific mode. Each mode dictates what syntax the compiler accepts as valid, and what it considers as invalid. The compiler mode can be set in the source code with the {$mode } compiler directive, or on the command line with the -M command line option.

Modes

• Free Pascal: {$mode FPC}
  This is the original Free Pascal compiler mode. As of version 3, It is the default mode of the compiler, so it is not necessary to explicitly add this directive.

• Extended Free Pascal: {$mode OBJFPC}
  This mode adds extra functionality to the FPC mode, including classes, interfaces and exceptions.

• Turbo Pascal: {$mode TP}
  This is the Turbo Pascal compatibility mode.

• Delphi: {$mode DELPHI}
  This is the Delphi compatibility mode.

• Mac Pascal: {$mode MacPAS}
  The Mac Pascal compatibility mode.

ModeSwitch

As of version 2.3.1 of Free Pascal, the {$ModeSwitch} compiler directive has been added to allow features of a compiler mode to be selectively added to the current mode, effectively creating a custom mode. For example:

{$mode FPC}
{$ModeSwitch EXCEPTIONS}

Will add exception handling to the FPC compiler mode.