Conditional compilation

User interface > Translation > Preprocessing > Conditional compilation

Delphi2Cpp II uses a preprocessor (pretranslator), which prepares the source text so that directives for the conditional compilation are evaluated and removed.

Conditional expressions like

{$IF CompilerVersion >= 17.0}

are evaluated too, but there are some limitations. Only integer values are evaluated and only operators, which also exist in C++. Sizeof-expressions like tho following are evaluated too

{$IF SizeOf(Extended) >= 10} 

  {$DEFINE EXTENDEDHAS10BYTES}

{$ENDIF}

The size is taken from the type-map.

If there is an expression, which cannot be evaluated, a warning is written into the code:

// pre-processor can't evaluate ...

The source code has to be corrected by hand then.

Include directives are executed too.

{$I filename}

{$INCLUDE filename}

The file filename is included into the source.

The definitions can be set in the options dialog.

This page belongs to the DelphiXE2Cpp11 Documentation