G. Compiler defines during compilation

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.

**Table:** Possible defines when compiling using FPC
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_SHARED	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.
FPK	Always defined for Free Pascal.
FPC	Always defined for Free Pascal.
VER1	Always defined for Free Pascal version 1.x.x.
VER10	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.

Remark: The ENDIAN_LITTLE and ENDIAN_BIG defines were added starting from Free Pascal version 1.0.5.

**Table:** Possible CPU defines when compiling using FPC
Define	When defined?
CPU86	Free Pascal target is an Intel 80x86 or compatible.
CPU87	Free Pascal target is an Intel 80x86 or compatible.
CPUI386	Free Pascal target is an Intel 80x86 or compatible.
CPU68k	Free Pascal target is a Motorola 680x0 or compatible.
CPU68	Free Pascal target is a Motorola 680x0 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 PowerPC or compatible.

**Table:** Possible defines when compiling using target OS
Target operating system	Defines
linux	LINUX, UNIX
freebsd	FREEBSD, BSD, LINUX, UNIX
netbsd	NETBSD, BSD, LINUX, UNIX
sunos	SUNOS, SOLARIS, UNIX
go32v2	GO32V2, DPMI
os2	OS2
Windows 32-bit	WIN32
Classic Amiga	AMIGA
Atari TOS	ATARI
Classic Macintosh	MAC
PalmOS	PALMOS
BeOS	BEOS, UNIX
QNX RTP	QNX, UNIX