C/C++ Cross-Platform Compile-Macros

November 5, 2023

When we compile some cross -platform programs, we will inevitably encounter _win32 __linux__ what is the macro of the compiler or the compiler environment.It indicates some information of the current platform environment to the compiler.

C C++

When we compile some cross -platform programs, we will inevitably encounter _win32 , Linux What are the macroscopic macro of the compiler environment.There are many differences between _win32 and win32 before.But there is a list here, making a memo.

For example, a code that can only be compiled under the Unix-Like platform in a set.If you compile the wrong error on the non-Unix-Like platform, then my code can add a macro to check whether it is a UNIX environment.If it is normally compiled, the error is thrown directly.

#ifndef __unix__
#error This program should be complied and work in UNIX-LIKE platform.
#endif

The complete code is as follows:

#ifndef __unix__
#error This program should be complied and work in UNIX-LIKE platform.
#endif

#include <stdio.h>

int main()
{
    printf("this is unix-like platform");
    return 0;
}

This code can be compiled normally in the Mac OS and Linux environments, and an error will be reported under Windows.

Below is a macro list of a detection environment.

Please send updates/corrections to predef-contribute.

AIX

Type	Macro	Description
Identification	_AIX
Version	_AIX'VR'	V = VersionR = Revision
Identification	TOS_AIX	Defined by xlC

Example
If _AIX is defined, then the following macros can be used to determine the version. Notice that the macros indicates the mentioned version or higher. For example, if _AIX43 is defined, then _AIX41 will also be defined.

AIX Version	Macro
3.2.x	_AIX3_AIX32
4.1	_AIX41
4.3	_AIX43

Android

Type	Macro	Format	Description
Identification	ANDROID
Version	ANDROID_API	V	V = API VersionMust be included from <android/api-level.h>

Notice that Android is based on Linux, and that the Linux macros also are defined for Android.
Example

Android Version	ANDROID_API
1.0	1
1.1	2
1.5	3
1.6	4
2.0	5
2.0.1	6
2.1	7
2.2	8
2.3	9
2.3.3	10
3.0	11

Amdahl UTS

Type	Macro
Identification	UTS

AmigaOS

Type	Macro	Description
Identification	AMIGA
Identification	amigaos	Defined by GNU C

Apollo AEGIS

Type	Macro
Identification	aegis

Apollo Domain/OS

Type	Macro
Identification	apollo

Bada
Based on Nucleus OS.

BeOS

Type	Macro
Identification	BEOS

Blue Gene

Type	Macro	Description
Identification	bg	All Blue Gene systemsDefined by XL C/C++ and GNU C
Version	bgq	Blue Gene/QDefined for XL C/C++ and GNU C
Identification	THW_BLUEGENE	All Blue Gene systemsDefined by XL C/C++
Version	TOS_BGQ	Blue Gene/QDefined by XL C/C++

BSD Environment

Type	Macro	Format	Description
Identification	FreeBSD__NetBSD__OpenBSD__bsdi__DragonFly
Version	BSD	YYYYMM	YYYY = YearMM = MonthMust be included from <sys/param.h>
Version	BSD4_2BSD4_3BSD4_4		Must be included from <sys/param.h>
Identification	_SYSTYPE_BSD		Defined by DEC C

Example

Version	BSD	Macro
4.3 Net2	199103
4.4	199306	BSD4_4
4.4BSD-Lite2	199506

BSD/OS

Type	Macro
Identification	bsdi

ConvexOS

Type	Macro
Identification	convex

Cygwin Environment

Type	Macro
Identification	CYGWIN

DG/UX

Type	Macro
Identification	DGUX
Identification	DGUX
Identification	dgux

DragonFly

Type	Macro
Identification	DragonFly

DYNIX/ptx

Type	Macro
Identification	SEQUENT
Identification	sequent

eCos

Type	Macro
Identification	__ECOS

EMX Environment

Type	Macro
Identification	EMX

FreeBSD

Type	Macro	Format	Description
Identification	FreeBSD
Identification	FreeBSD_kernel		From FreeBSD 8.3, 9.1, and 10.0.1
Version	BSD
Version	FreeBSD	V	V = Version
Version	__FreeBSD_version	?	Must be included from osreldate.h

Example

FreeBSD	FreeBSD	__FreeBSD_version
1.x	1
2.0-RELEASE	2	119411
2.2-RELEASE	2	220000
3.0-RELEASE	3	300005
4.0-RELEASE	4	400017
4.5-RELEASE	4	450000

For more information see the FreeBSD porters handbook.
GNU aka GNU/Hurd
The official name of this operating system is GNU. Hurd is the kernel in the GNU operating system. It is often listed as GNU/Hurd since there is also GNU/Linux and GNU/kFreeBSD, which are most of the GNU operating system with the Linux and FreeBSD kernels respectively.

Type	Macro
Identification	GNU 1
Identification	gnu_hurd 1

GNU/kFreeBSD
GNU/kFreeBSD is one of the Debian distros that is based on the FreeBSD kernel rather than the Linux or Hurd kernels.

Type	Macro
Identification	FreeBSD_kernel && GLIBC

Notice that FreeBSD also defines __FreeBSD_kernel__ so the __GLIBC__ macro must be checked to distinguish it.
GNU/Linux

Type	Macro
Identification	gnu_linux

HI-UX MPP

Type	Macro
Identification	__hiuxmpp

HP-UX

Type	Macro	Description
Identification	_hpux	Defined by HP UPC
Identification	hpux
Identification	__hpux

IBM OS/400

Type	Macro
Identification	OS400

INTEGRITY

Type	Macro
Identification	__INTEGRITY

Interix Environment

Type	Macro	Description
Identification	__INTERIX	Defined by GNU C and Visual Studio

IRIX

Type	Macro
Identification	sgi
Identification	__sgi

Linux kernel
Systems based on the Linux kernel define these macros. There are two major Linux-based operating systems: GNU/Linux andAndroid, and numerous others like Ångström or OpenEmbedded

Type	Macro	Description
Identification	linux	1
Identification	linux	Obsolete (not POSIX compliant)
Identification	__linux	Obsolete (not POSIX compliant)

LynxOS

Type	Macro
Identification	Lynx

MacOS

Type	Macro	Description
Identification	macintosh	Mac OS 9
Identification	Macintosh	Mac OS 9
Identification	APPLE && MACH	Mac OS XDefined by GNU C and Intel C++

Microware OS-9

Type	Macro	Description
Identification	__OS9000	Defined by Ultimate C/C++
Identification	_OSK	Defined by Ultimate C/C++

MINIX

Type	Macro
Identification	__minix

MorphOS

Type	Macro
Identification	MORPHOS

MPE/iX

Type	Macro
Identification	mpeix
Identification	__mpexl

MSDOS

Type	Macro
Identification	MSDOS
Identification	MSDOS
Identification	_MSDOS
Identification	DOS

NetBSD

Type	Macro	Format	Description
Identification	NetBSD
Version	BSD
Version	NetBSD'V'_'R'		V = VersionR = RevisionMust be included from <sys/param.h>
Version	NetBSD_Version	VVRRAAPP00	VV = VersionRR = RevisionAA = ReleasePP = PatchFrom NetBSD 1.2D (?) until NetBSD 2.0HMust be included from <sys/param.h>
Version	NetBSD_Version	VVRR00PP00	VV = VersionRR = RevisionPP = PatchFrom NetBSD 2.99.9Must be included from <sys/param.h>

Example

NetBSD	NetBSD_Version	Macro
0.8		NetBSD0_8
0.9		NetBSD0_9
1.0		NetBSD1_0 = 1
1.0A		NetBSD1_0 = 2
1.2D	102040000
1.2.1	102000100

NonStop

Type	Macro
Identification	__TANDEM

Nucleus RTOS

Type	Macro
Identification	nucleus

OpenBSD

Type	Macro	Description
Identification	OpenBSD
Version	BSD
Version	OpenBSD'V'_'R'	V = VersionR = RevisionMust be included from sys/param.h

Example

OpenBSD	Macro
3.1	OpenBSD3_1
3.9	OpenBSD3_9

OS/2

Type	Macro
Identification	OS2
Identification	_OS2
Identification	OS2
Identification	TOS_OS2

Palm OS

Type	Macro	Description
Identification	palmos	Defined by GNU C in PRC-Tools

Plan 9

Type	Macro
Identification	EPLAN9

Pyramid DC/OSx

Type	Macro
Identification	pyr

QNX

Type	Macro	Format	Description
Identification	QNX		QNX 4.x
Identification	QNXNTO		QNX 6.x
Version	_NTO_VERSION	VRR	V = VersionRR = RevisionOnly available when QNXNTO is defined.Must be included from sys/neutrino.h/
Version	BBNDK_VERSION_CURRENT	VVRRRRPPPP	V = VersionRRRR = RevisionPPPP = PatchOnly available on Blackberry 10From Blackberry 10.1.0Must be included from bbndk.h

Example

QNX	_NTO_VERSION
6.2	620

Reliant UNIX

Type	Macro
Identification	sinux

SCO OpenServer

Type	Macro	Description
Identification	M_I386	Defined by GNU C
Identification	M_XENIX	Defined by GNU C
Identification	_SCO_DS

Solaris

Type	Macro	Description
Identification	sun
Identification	__sun
Version	_'System''Version'	System = uname -sVersion = uname -rAny illegal character is replaced by an underscore.Defined by Sun Studio

Use the SVR4 macros to distinguish between Solaris and SunOS.
#if defined(sun) || defined(**sun) # if defined(**SVR4) || defined(svr4) /_ Solaris / # else / SunOS _/ # endif #endif
Example

Solaris	Macro
2.7	__SunOS_5_7
8	__SunOS_5_8

Stratus VOS

Type	Macro	Format	Description
Identification	VOS
Version	VOS	V	V = Version

Notice that the __VOS__ macro is defined by the compiler, but as several compilers can co-exist in the same OS release, the version number is not reliable.
SVR4 Environment

Type	Macro	Description
Identification	sysv
Identification	__SVR4
Identification	svr4
Identification	_SYSTYPE_SVR4	Defined on IRIX

Syllable

Type	Macro
Identification	SYLLABLE

Symbian OS

Type	Macro
Identification	SYMBIAN32

Tru64 (OSF/1)

Type	Macro
Identification	osf
Identification	__osf

Ultrix

Type	Macro
Identification	ultrix
Identification	__ultrix
Identification	ultrix
Identification	unix & vax

UNICOS

Type	Macro	Format	Description
Identification	_UNICOS
Version	_UNICOS	V	V = Version

UNICOS/mp

Type	Macro	Description
Identification	_CRAY__crayx1

UNIX Environment

Type	Macro
Identification	unix
Identification	__unix

Notice that not all compilers defines these macros, e.g. the xlC or the DEC C/C++ compiler, so it may be better to use the POSIX or X/Open standard macros instead.
UnixWare

Type	Macro
Identification	sco
Identification	_UNIXWARE7

U/Win Environment

Type	Macro
Identification	_UWIN

VMS

Type	Macro	Format	Description
Identification	VMS
Identification	__VMS
Version	__VMS_VER	VVRREPPTT	VV = VersionRR = RevisionE = Edit numberPP = Patch (01 = A, ... 26 = Z)TT = Type (22 = official)

Example

VMS	__VMS_VER
6.1	60100022
6.2	60200022
6.2-1I	60210922

VxWorks

Type	Macro	Description
Identification	VXWORKS	Defined by GNU C and Diab (from ?)
Identification	__vxworks	Defined by GNU C and Diab (from ?)
Version	_WRS_VXWORKS_MAJOR	VersionMust be included from version.h
Version	_WRS_VXWORKS_MINOR	RevisionMust be included from version.h
Version	_WRS_VXWORKS_MAINT	Patch/maintenanceMust be included from version.h
Mode	RTP	For real-time mode
Mode	_WRS_KERNEL	For kernel mode

Example

VxWorks	_WRS_VXWORKS_MAJOR	_WRS_VXWORKS_MINOR	_WRS_VXWORKS_MAINT
6.2	6	2	0

Windows

Type	Macro	Description
Identification	_WIN16	Defined for 16-bit environments 1
Identification	_WIN32	Defined for both 32-bit and 64-bit environments 1
Identification	_WIN64	Defined for 64-bit environments 1
Identification	WIN32	Defined by Borland C++
Identification	TOS_WIN	Defined by xlC
Identification	WINDOWS	Defined by Watcom C/C++

Windows CE

Type	Macro	Format	Description
Identification	_WIN32_WCE		Defined by Embedded Visual Studio C++
Version	_WIN32_WCE	VRR	V = VersionR = Revision
Identification	WIN32PLATFORM'P'		P = Platform
Version	WIN32PLATFORM'P'	V	P = PlatformV = Version

Example

Version	_WIN32_WCE
2.01	201
2.11	211
3.0	300
4.0	400
4.1	410
4.2	420
5.0	501

Platform	Macro	Value
H/PC 2000	WIN32_PLATFORM_HPC2000
H/PC Pro 2.11	WIN32_PLATFORM_HPCPRO	211
H/PC Pro 3.0	WIN32_PLATFORM_HPCPRO	300
Pocket PC	WIN32_PLATFORM_PSPC	1
Pocket PC 2002	WIN32_PLATFORM_PSPC	310
Windows Mobile 2003	WIN32_PLATFORM_PSPC	400
Smartphone 2002	WIN32_PLATFORM_WFSP	100

Wind/U Environment

Type	Macro	Format	Description
Identification	_WINDU_SOURCE
Version	_WINDU_SOURCE	0xVVRRPP	VV = VersionRR = RevisionPP = Patch

Example

Wind/U	_WINDU_SOURCE
3.1.2	0x030102

z/OS

Type	Macro	Description
Identification	MVS	Host
Identification	HOS_MVS	Host
Identification	TOS_MVS	Target

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