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Appendix G
Compiler denes during compilation

This appendix describes the possible denes when compiling programs using Free Pascal. A brief explanation of the dene, and when it is used is also given.

Table G.1: Possible denes when compiling using FPC

Dene description
FPC_LINK_DYNAMICDened when the output will be linked dynamically.
This is dened when using the -XD compiler switch.
FPC_LINK_STATIC Dened when the output will be linked statically.
This is the default mode.
FPC_LINK_SMART Dened when the output will be smartlinked.
This is dened when using the -XX compiler switch.
FPC_PROFILE Dened when proling code is added to program.
This is dened when using the -pg compiler switch.
FPC Always dened for Free Pascal.
VER1 Always dened for Free Pascal version 1.x.x.
VER1_0 Always dened for Free Pascal version 1.0.x.
ENDIAN_LITTLE Dened when the Free Pascal target is a little-endian processor
(80x86, Alpha, ARM).
ENDIAN_BIG Dened 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 denes were added starting from Free Pascal version 1.0.5.

Table G.2: Possible CPU denes when compiling using FPC

Dene When dened?
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 80386 or later.
CPU68k 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.
CPUSPARC Free Pascal target is a SPARC v7 or compatible.
CPUALPHA Free Pascal target is an Alpha AXP or compatible.
CPUPOWERPCFree Pascal target is a 32-bit PowerPC or compatible.

Table G.3: Possible denes when compiling using target OS

Target operating systemDenes
linux LINUX, UNIX
freebsd FREEBSD, BSD, UNIX
netbsd NETBSD, BSD, 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

Remark: The unix dene was added starting from Free Pascal version 1.0.5. The BSD operating systems no longer dene LINUX starting with version 1.0.7.

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