| Define | description |
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| FPC_LINK_DYNAMIC | Defined when the output will be linked dynamically. |
| | This is defined when using the -XD compiler switch. |
| FPC_LINK_STATIC | Defined when the output will be linked statically. |
| | This is the default mode. |
| FPC_LINK_SMART | Defined when the output will be smartlinked. |
| | This is defined when using the -XX compiler switch. |
| FPC_PROFILE | Defined when profiling code is added to program. |
| | This is defined when using the -pg compiler switch. |
| FPC | Always defined for Free Pascal. |
| VER1 | Always defined for Free Pascal version 1.x.x. |
| VER1_0 | Always defined for Free Pascal version 1.0.x. |
| ENDIAN_LITTLE | Defined when the Free Pascal target is a little-endian processor |
| | (80x86, Alpha, ARM). |
| ENDIAN_BIG | Defined when the Free Pascal target is a big-endian processor |
| | (680x0, PowerPC, SPARC, MIPS). |
| FPC_DELPHI | Free Pascal is in Delphi mode, either using compiler switch -Sd or |
| | using the $MODE DELPHI directive. |
| FPC_OBJFPC | Free Pascal is in Delphi mode, either using compiler switch -S2 or |
| | using the $MODE OBJFPC directive. |
| FPC_TP | Free Pascal is in Turbo Pascal mode, either using compiler switch -So or |
| | using the $MODE TP directive. |
| FPC_GPC | Free Pascal is in GNU Pascal mode, either using compiler switch -Sp or |
| | using the $MODE GPC directive. |
| |