Source Code Macros

Architecture Macros

To guard OW architecture specific source code use following preferred architecture macros.

Target architecture	Preferred macro	Deprecated macros
8086	_M_I86	__I86__, __86__, __X86__, _X86_
80x86	_M_X86	_M_I386, __386__, __X86__, _X86_
x64	_M_X64
Alpha	__AXP__	_M_ALPHA, __ALPHA__, _ALPHA_
Mips	__MIPS__	_M_MRX000
PowerPC	__PPC__	_M_PPC, __POWERPC__, _PPC_
ARM-32	_M_ARM
ARM-64	_M_ARM64

Target OS Macros

To guard OW Target specific source code use following preferred architecture macros.

Target OS	Architecture neutral macro	Specific macros
DOS	__DOS__	__DOS_086__, __DOS_386__
OS/2	__OS2__	__OS2_286__, __OS2_386__, __OS2_PPC__
Windows	__WINDOWS__	__WINDOWS_286__, __WINDOWS_386__
NT (WIN32)	__NT__	__NT_386__, __NT_AXP__, __NT_MIPS__, __NT_PPC__
NT (WIN64)	__NT__	__NT_X64__
Linux	__LINUX__, __UNIX__	__LINUX_386__, __LINUX_X64__, __LINUX_MIPS__, __LINUX_PPC__, __LINUX_ARM__, __LINUX_ARM64__
Netware	__NETWARE__	__NETWARE_386__ __NETWARE5__
QNX	__QNX__, __UNIX__	__QNX_286__, __QNX_386__
RDOS	__RDOS__
RDOS drivers	__RDOSDEV__
OSX	__OSX__, __UNIX__	__OSX_386__, __OSX_X64__, __OSX_ARM__, __OSX_ARM64__
BSD general	__BSD__, __UNIX__	__BSD_386__, __BSD_X64__, __BSD_ARM__, __BSD_ARM64__
FreeBSD	__UNIX__, __BSD__, __FREEBSD__	__BSD_386__, __BSD_X64__, __BSD_ARM__, __BSD_ARM64__
DragonFly	__UNIX__, __BSD__, __DRAGONFLY__	__BSD_386__, __BSD_X64__, __BSD_ARM__, __BSD_ARM64__
NetBSD	__UNIX__, __BSD__, __NETBSD__	__BSD_386__, __BSD_X64__, __BSD_ARM__, __BSD_ARM64__
OpenBSD	__UNIX__, __BSD__, __OPENBSD__	__BSD_386__, __BSD_X64__, __BSD_ARM__, __BSD_ARM64__

Memory model Macros

To guard OW memory model specific source code use following memory model macros.

Memory model	Code	Data	Macro	Deprecated macros
Small	near	near	__SMALL__	_M_I86SM, M_I86SM
Compact	near	far	__COMPACT__	_M_I86CM, M_I86CM
Medium	far	near	__MEDIUM__	_M_I86MM, M_I86MM
Large	far	far	__LARGE__	_M_I86LM, M_I86LM
Huge	far	far	__HUGE__	_M_I86HM, M_I86HM
Flat	near	near	__FLAT__	_M_386FM, M_386FM