Platform defines

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Useful tips before using platform defines

• Marco van de Voort: Development Tutorial (a.k.a Build FAQ) – general building guidelines
• Marco van de Voort: Creating a portable Pascal codebase. – general porting guidelines
• if you need to cast a pointer to an integer for arithmetic or you want to provide a spare field (like tag in TComponent) that may be used to store a pointer, use PtrInt as signed type, or better PtrUInt as unsigned type.

Architecture defines

  Note: This is a copy of the official FPC documentation which is the authorative version for the stable FPC version.

define(s)	meaning
General
ENDIAN_BIG	big endian
ENDIAN_LITTLE	little endian
CPU16	16 bit CPU
CPU32	32 bit CPU
CPU64	64 bit CPU
Specific
CPU86	Intel 8086 and compatible (original PC)
CPU87	Intel 8086 and compatible (original PC)
CPU386, CPUi386	386 and compatible (32 bit PC)
CPUAMD64, CPUX86_64	AMD64 or Intel 64-bit processor
CPUIA64	Intel itanium 64-bit processor
CPU68	Motorola 680x0 or compatible CPU
CPU68K, CPUM68K	Motorola 680x0 or compatible CPU
CPUM68020	Motorola 68020 or compatible CPU
CPUPOWERPC	PowerPC processor (32 or 64 bit)
CPUPOWERPC32	PowerPC processor (32 bit)
CPUPOWERPC64	PowerPC processor (64 bit)
CPUSPARC, CPUSPARC32	SPARC v7 or compatible
CPUARM	ARM 32 bit processor
CPUAVR	AVR 8/16-bit processor
FPU
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 I386 and higher.
FPUITANIUM	On Intel Itanium.
FPUSTANDARD	On PowerPC (32/64 bit).
FPUHARD	On Sparc.

Operating system defines

In the following tree, you have to follow leaves to their respective roots, in order to determine all defines:

• AMIGA: Classic Amiga
• ATARI: Atari TOS
• GO32V2, DPMI: MS DOS (using go32v2 extender)
• MACOS: Classic Macintosh (System 7 etc.)
• MSDOS on MS-DOS 16 bit real mode targets (defined since FPC version 2.7.1)
• OS2 on OS2 targets
  • EMX on emx targets
• PALMOS: on PalmOS and Garnet OS targets
• UNIX
  • BEOS on BeOS targets
  • BSD
    • DARWIN on Mac OS X and iOS targets
    • FREEBSD on FreeBSD targets
    • NETBSD on NetBSD targets
  • LINUX on Linux targets
  • SOLARIS on Solaris targets
    • SUNOS on SunOS targets
  • QNX on QNX RTP targets
• WINDOWS for all Windows targets
  • MSWINDOWS
    • WIN32: 32-bit Windows
    • WIN64: 64-bit Windows
  • WINCE, UNDER_CE, UNICODE<ref name="winceUnicode" group="note"/>: Windows CE, Windows mobile

Notes

<references group="note"> <ref name="winceUnicode">UNICODE was defined till 3.0.0, see [[User Changes 3.0#Define UNICODE was changed to FPC_OS_UNICODE|User changes 3.0 § “define UNICODE was changed to FPC_OS_UNICODE”]]</ref> </references>

See also

• Delphi Wikia article “FreePascal detection and versioning”
• Free Pascal Documentation: Appendix G: Compiler defines during compilation