This appendix describes the possible defines when compiling programs using Free Pascal. A brief explanation of the define, and when it is used is also given.
| Define | description |
| 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_CROSSCOMPILING | Defined when the target OS/CPU |
| is different from the source OS/CPU. | |
| FPC | Always defined for Free Pascal. |
| VER2 | Always defined for Free Pascal version 2.x.x. |
| VER2_0 | Always defined for Free Pascal version 2.0.x. |
| VER2_2 | Always defined for Free Pascal version 2.2.x. |
| VER3 | Always defined for Free Pascal version 3.x.x. |
| VER3_0 | Always defined for Free Pascal version 3.0.x. |
| VER3_2 | Always defined for Free Pascal version 3.2.x. |
| FPC_VERSION | Contains the major version number from FPC. |
| FPC_RELEASE | Contains the minor version number from FPC. |
| FPC_PATCH | Contains the third part of the version number from FPC. |
| FPC_FULLVERSION | Contains the entire version number from FPC as a single |
| number which can be used for comparing. For FPC 2.2.4 it will contain 20204. | |
| 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 -MDelphi or |
| using the $MODE DELPHI directive. | |
| FPC_OBJFPC | Free Pascal is in OBJFPC mode, either using compiler switch -Mobjfpc or |
| using the $MODE OBJFPC directive. | |
| FPC_TP | Free Pascal is in Turbo Pascal mode, either using compiler switch -Mtp or |
| using the $MODE TP directive. | |
| FPC_MACPAS | Free Pascal is in Mac Pascal mode, either using compiler switch -Mmacpas or |
| using the $MODE MACPAS directive. | |
Remark The ENDIAN_LITTLE and ENDIAN_BIG defines were added starting from Free Pascal version 1.0.5.
| Define | When defined? |
| CPU86 | Free Pascal target is an Intel 80x86 or compatible (16 and 32 bit). |
| CPU87 | Free Pascal target is an Intel 80x86 or compatible (16 and 32 bit). |
| CPU386 | Free Pascal target is an Intel 80386 or later. |
| CPUI386 | Free Pascal target is an Intel 80386 or later. |
| CPU68K | Free Pascal target is a Motorola 680x0 or compatible. |
| CPUM68K | Free Pascal target is a Motorola 680x0 or compatible. |
| CPUM68020 | Free Pascal target is a Motorola 68020 or later. |
| CPU68 | Free Pascal target is a Motorola 680x0 or compatible. |
| CPUSPARC32 | Free Pascal target is a SPARC v7 or compatible. |
| CPUSPARC | Free Pascal target is a SPARC v7 or compatible. |
| CPUALPHA | Free Pascal target is an Alpha AXP or compatible. |
| CPUPOWERPC | Free Pascal target is a 32-bit or 64-bit PowerPC or compatible. |
| CPUPOWERPC32 | Free Pascal target is a 32-bit PowerPC or compatible. |
| CPUPOWERPC64 | Free Pascal target is a 64-bit PowerPC or compatible. |
| CPUX86_64 | Free Pascal target is a AMD64 or Intel 64-bit processor. |
| CPUAMD64 | Free Pascal target is a AMD64 or Intel 64-bit processor. |
| CPUX64 | Free Pascal target is a AMD64 or Intel 64-bit processor |
| CPUIA64 | Free Pascal target is a Intel itanium 64-bit processor. |
| CPUARM | Free Pascal target is an ARM 32-bit processor. |
| CPUAVR | Free Pascal target is an AVR 16-bit processor. |
| CPU16 | Free Pascal target is a 16-bit CPU. |
| CPU32 | Free Pascal target is a 32-bit CPU. |
| CPU64 | Free Pascal target is a 64-bit CPU. |
| CPUI8086 | indicates a 16-bit x86 target (i8086) |
| Define | When defined? |
| FPUSOFT | Software emulation of FPU (all types). |
| FPUSSE64 | SSE64 FPU on Intel I386 and higher, AMD64. |
| FPUSSE | SSE instructions on Intel I386 and higher. |
| FPUSSE2 | SSE 2 instructions on Intel I386 and higher. |
| FPUSSE3 | SSE 3 instructions on Intel I386 and higher, AMD64. |
| FPULIBGCC | GCC library FPU emulation on ARM and M68K. |
| FPU68881 | 68881 on M68K. |
| FPUFPA | FPA on ARM. |
| FPUFPA10 | FPA 10 on ARM. |
| FPUFPA11 | FPA 11 on ARM. |
| FPUVFP | VFP on ARM. |
| FPUX87 | X87 FPU on Intel I8086 and higher. |
| FPUITANIUM | On Intel Itanium. |
| FPUSTANDARD | On PowerPC (32/64 bit). |
| FPUHARD | On Sparc. |
| Target operating system | Defines |
| AIX | AIX, UNIX |
| Amiga | AMIGA |
| Android | ANDROID |
| linux | LINUX, UNIX |
| freebsd | FREEBSD, BSD, UNIX, DRAGONFLY |
| netbsd | NETBSD, BSD, UNIX |
| openbsd | OPENBSD, BSD, UNIX |
| sunos | SUNOS, SOLARIS, UNIX |
| go32v2 | GO32V2, DPMI |
| MS-DOS 16 bit real mode | MSDOS (2.7.1 and higher) |
| Haiku | HAIKU |
| os2 | OS2 |
| NETWARE | NETWARE, NETWLIBC |
| Nintendo DS | NDS |
| emx | OS2, EMX |
| Solaris | SOLARIS |
| WII | WII |
| Windows (native NT) | NATIVENT |
| Windows (16-bit) | WIN16 |
| Windows (all) | WINDOWS |
| Windows 32-bit | WIN32, MSWINDOWS |
| Windows 64-bit | WIN64, MSWINDOWS |
| Windows (winCE) | WINCE, UNDER_CE, FPC_OS_UNICODE |
| Classic Amiga | AMIGA |
| Atari TOS | ATARI |
| Classic Macintosh | MACOS |
| PalmOS | PALMOS |
| BeOS | BEOS, UNIX |
| QNX RTP | QNX, UNIX |
| Mac OS X | BSD, DARWIN, UNIX, IPHONESYM |
On MS-DOS 16 bit, the memory model used to compile the program is defined in one of the defines FPC_MM_TINY, FPC_MM_SMALL,FPC_MM_MEDIUM, FPC_MM_COMPACT,FPC_MM_LARGE, FPC_MM_HUGE.
Remark The unix define was added starting from Free Pascal version 1.0.5. The BSD operating systems no longer define LINUX starting with version 1.0.7.
| Define | Feature |
| FPC_HAS_FEATURE_HEAP | Dynamic memory management |
| FPC_HAS_FEATURE_INITFINAL | Initialization and Finalization |
| FPC_HAS_FEATURE_RTTI | RTTI information |
| FPC_HAS_FEATURE_CLASSES | Classses |
| FPC_HAS_FEATURE_EXCEPTIONS | Exception support |
| FPC_HAS_FEATURE_EXITCODE | Program exit code |
| FPC_HAS_FEATURE_ANSISTRINGS | AnsiStrings |
| FPC_HAS_FEATURE_WIDESTRINGS | WideStrings |
| FPC_HAS_FEATURE_TEXTIO | Text file I/O |
| FPC_HAS_FEATURE_CONSOLEIO | Console I/O |
| FPC_HAS_FEATURE_FILEIO | Raw file I/O |
| FPC_HAS_FEATURE_RANDOM | Random function |
| FPC_HAS_FEATURE_VARIANTS | Variant support |
| FPC_HAS_FEATURE_OBJECTS | TP object support |
| FPC_HAS_FEATURE_DYNARRAYS | Dynamic arrays |
| FPC_HAS_FEATURE_THREADING | Threading support |
| FPC_HAS_FEATURE_COMMANDARGS | Command-line argument support |
| FPC_HAS_FEATURE_PROCESSES | Process execution support |
| FPC_HAS_FEATURE_STACKCHECK | Stack checking |
| FPC_HAS_FEATURE_DYNLIBS | Dynamic library loading |
| FPC_HAS_FEATURE_SOFTFPU | Software FPU emulation |
| FPC_HAS_FEATURE_OBJECTIVEC1 | Objective C support |
| FPC_HAS_FEATURE_RESOURCES | Resources support |
| FPC_HAS_FEATURE_UNICODESTRINGS | Unicode string support |
| Define | Feature |
| FPC_HAS_WINLIKERESOURCES | Windows-like resource |
| FPC_HAS_TYPE_EXTENDED | Extended floating point type |
| FPC_HAS_TYPE_DOUBLE | Double floating point type |
| FPC_HAS_TYPE_SINGLE | Single floating point type |
| FPC_HAS_TYPE_FLOAT128 | 128-bit floating point type |
| FPC_HAS_INTERNAL_ABS_SHORTINT | Internal handling of Abs() for shortint (8-bit) |
| FPC_HAS_INTERNAL_ABS_SMALLINT | Internal handling of Abs() for smallint (16-bit) |
| FPC_HAS_INTERNAL_ABS_LONG | Internal handling of Abs() for longint (32-bit) |
| FPC_HAS_INTERNAL_ABS_INT64 | Internal handling of Abs() for int64 (64-bit) |
| FPC_HAS_UNICODESTRING | Unicode string type |
| FPC_HAS_CPSTRING | Codepage string type |
| FPC_HAS_RIP_RELATIVE | relative addressing |
| FPC_HAS_CEXTENDED | C extended type |
| FPC_HAS_RESSTRINITS | Initialization of resource strings |
| FPC_HAS_INTERNAL_ROX | Internal ROX command |
| FPC_HAS_LWSYNC | ? |
| FPC_HAS_INTERNAL_SAR | Internal SAR command |
| FPC_HAS_OPERATOR_ENUMERATOR | Enumerator operator support |
| FPC_HAS_CONSTREF | Constref keyword support |
| FPC_HAS_MEMBAR | Memory barrier support |
| FPC_HAS_FEATURE_SUPPORT | HAS_FEATURE_ support |
| FPC_HAS_INTERNAL_BSF | Internal support for BSF |
| FPC_HAS_INTERNAL_BSR | Internal support for BSR |
| FPC_HAS_FAST_FMA_SINGLE | Fast floating point FMA for single floats |
| FPC_HAS_FAST_FMA_DOUBLE | Fast floating point FMA for double floats |
| FPC_HAS_INDIRECT_ENTRY_INFORMATION | Indirect entry information support |
| FPC_HAS_DYNAMIC_PACKAGES | Dynamic packages support |
| FPC_HAS_INDIRECT_VAR_ACCESS | Indirect variable access |