linux下查看系统自身宏定义

跨平台程序，经常要用到区分系统的宏定义，比如windows中的WIN32, WIN64, Linux中的 unix, linux等等系统自定义宏

那么在linux下面，怎么查看系统有哪些自定义宏咧，用如下方法：

$ touch dummy.hxx

$ cpp -dM ./dummy.hxx

输出如下：

[xhq@syfh1-10-0-128-229 server]$ cpp -dM ./dummy.hxx 
#define __DBL_MIN_EXP__ (-1021)
#define __FLT_MIN__ 1.17549435e-38F
#define __CHAR_BIT__ 8
#define __WCHAR_MAX__ 2147483647
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
#define __FLT_EVAL_METHOD__ 0
#define __unix__ 1
#define __x86_64 1
#define __DBL_MIN_10_EXP__ (-307)
#define __FINITE_MATH_ONLY__ 0
#define __GNUC_PATCHLEVEL__ 7
#define __DEC64_MAX_EXP__ 385
#define __SHRT_MAX__ 32767
#define __LDBL_MAX__ 1.18973149535723176502e+4932L
#define __UINTMAX_TYPE__ long unsigned int
#define __linux 1
#define __DEC32_EPSILON__ 1E-6DF
#define __unix 1
#define __LDBL_MAX_EXP__ 16384
#define __linux__ 1

要查看全部，可以加less命令：

$ cpp -dM ./dummy.hxx  |   less

就可以光标向上翻或者向下翻，因为系统可能宏定义比较多，一屏看不过来

以上原文地址：http://blog.csdn.net/xiaoheqin/article/details/52183073

另附上各操作系统的平台宏定义

AIX

Type	Macro	Description
Identification	_AIX
Version	_AIX"VR"	V = Version R = 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 Version Must 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 systems Defined by XL C/C++ and GNU C
Version	__bgq__	Blue Gene/Q Defined for XL C/C++ and GNU C
Identification	__THW_BLUEGENE__	All Blue Gene systems Defined by XL C/C++
Version	__TOS_BGQ__	Blue Gene/Q Defined by XL C/C++

BSD Environment

Type	Macro	Format	Description
Identification	__FreeBSD__ __NetBSD__ __OpenBSD__ __bsdi__ __DragonFly__
Version	BSD	YYYYMM	YYYY = Year MM = Month Must be included from <sys/param.h>
Version	BSD4_2 BSD4_3 BSD4_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

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