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cpp -dM

#define __DBL_MIN_EXP__ (-1021)

#define __FLT_MIN__ 1.17549435e-38F

#define __DEC64_DEN__ 0.000000000000001E-383DD

#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 __FLT_EVAL_METHOD__ 2

#define __unix__ 1

#define __DBL_MIN_10_EXP__ (-307)

#define __FINITE_MATH_ONLY__ 0

#define __GNUC_PATCHLEVEL__ 2

#define __DEC64_MAX_EXP__ 384

#define __SHRT_MAX__ 32767

#define __LDBL_MAX__ 1.18973149535723176502e+4932L

#define __UINTMAX_TYPE__ long long unsigned int

#define __linux 1

#define __DEC32_EPSILON__ 1E-6DF

#define __unix 1

#define __LDBL_MAX_EXP__ 16384

#define __linux__ 1

#define __SCHAR_MAX__ 127

#define __DBL_DIG__ 15

#define __SIZEOF_INT__ 4

#define __SIZEOF_POINTER__ 4

#define __USER_LABEL_PREFIX__ 

#define __STDC_HOSTED__ 1

#define __LDBL_HAS_INFINITY__ 1

#define __FLT_EPSILON__ 1.19209290e-7F

#define __LDBL_MIN__ 3.36210314311209350626e-4932L

#define __DEC32_MAX__ 9.999999E96DF

#define __SIZEOF_LONG__ 4

#define __DECIMAL_DIG__ 21

#define __gnu_linux__ 1

#define __LDBL_HAS_QUIET_NAN__ 1

#define __GNUC__ 4

#define __FLT_HAS_DENORM__ 1

#define __SIZEOF_LONG_DOUBLE__ 12

#define __DBL_MAX__ 1.7976931348623157e+308

#define __DBL_HAS_INFINITY__ 1

#define __DEC32_MIN_EXP__ (-95)

#define __LDBL_HAS_DENORM__ 1

#define __DEC128_MAX__ 9.999999999999999999999999999999999E6144DL

#define __DEC32_MIN__ 1E-95DF

#define __DBL_MAX_EXP__ 1024

#define __DEC128_EPSILON__ 1E-33DL

#define __LONG_LONG_MAX__ 9223372036854775807LL

#define __SIZEOF_SIZE_T__ 4

#define __SIZEOF_WINT_T__ 4

#define __GXX_ABI_VERSION 1002

#define __FLT_MIN_EXP__ (-125)

#define __DBL_MIN__ 2.2250738585072014e-308

#define __DECIMAL_BID_FORMAT__ 1

#define __DEC128_MIN__ 1E-6143DL

#define __REGISTER_PREFIX__ 

#define __DBL_HAS_DENORM__ 1

#define __NO_INLINE__ 1

#define __i386 1

#define __FLT_MANT_DIG__ 24

#define __VERSION__ "4.3.2"

#define __DEC64_EPSILON__ 1E-15DD

#define __DEC128_MIN_EXP__ (-6143)

#define __i486__ 1

#define unix 1

#define __i386__ 1

#define __SIZE_TYPE__ unsigned int

#define __DEC32_DEN__ 0.000001E-95DF

#define __ELF__ 1

#define __FLT_RADIX__ 2

#define __LDBL_EPSILON__ 1.08420217248550443401e-19L

#define __SIZEOF_PTRDIFF_T__ 4

#define __FLT_HAS_QUIET_NAN__ 1

#define __FLT_MAX_10_EXP__ 38

#define __LONG_MAX__ 2147483647L

#define __FLT_HAS_INFINITY__ 1

#define __DEC64_MAX__ 9.999999999999999E384DD

#define __DEC64_MANT_DIG__ 16

#define __DEC32_MAX_EXP__ 96

#define linux 1

#define __DEC128_DEN__ 0.000000000000000000000000000000001E-6143DL

#define __LDBL_MANT_DIG__ 64

#define __DBL_HAS_QUIET_NAN__ 1

#define __WCHAR_TYPE__ int

#define __SIZEOF_FLOAT__ 4

#define __DEC64_MIN_EXP__ (-383)

#define __FLT_DIG__ 6

#define __INT_MAX__ 2147483647

#define __i486 1

#define __FLT_MAX_EXP__ 128

#define __DBL_MANT_DIG__ 53

#define __DEC64_MIN__ 1E-383DD

#define __WINT_TYPE__ unsigned int

#define __SIZEOF_SHORT__ 2

#define __LDBL_MIN_EXP__ (-16381)

#define __LDBL_MAX_10_EXP__ 4932

#define __DBL_EPSILON__ 2.2204460492503131e-16

#define __SIZEOF_WCHAR_T__ 4

#define __DEC_EVAL_METHOD__ 2

#define __INTMAX_MAX__ 9223372036854775807LL

#define __FLT_DENORM_MIN__ 1.40129846e-45F

#define __FLT_MAX__ 3.40282347e+38F

#define __SIZEOF_DOUBLE__ 8

#define __FLT_MIN_10_EXP__ (-37)

#define __INTMAX_TYPE__ long long int

#define i386 1

#define __DEC128_MAX_EXP__ 6144

#define __GNUC_MINOR__ 3

#define __DEC32_MANT_DIG__ 7

#define __DBL_MAX_10_EXP__ 308

#define __LDBL_DENORM_MIN__ 3.64519953188247460253e-4951L

#define __STDC__ 1

#define __PTRDIFF_TYPE__ int

#define __DEC128_MANT_DIG__ 34

#define __LDBL_MIN_10_EXP__ (-4931)

#define __SIZEOF_LONG_LONG__ 8

#define __LDBL_DIG__ 18

#define __GNUC_GNU_INLINE__ 1

Microsoft VC++ (aus MSDN April 2000)

Predefined Macros

The compiler recognizes six predefined ANSI C macros (see Table 1.1),

and the Microsoft C++ implementation provides several more (see Table

1.2). These macros take no arguments and cannot be redefined. Their

value (except for __LINE__ and __FILE__) must be constant throughout

compilation. Some of the predefined macros listed below are defined

with multiple values. Their values can be set by selecting the

corresponding menu option in the Visual C++ development environment,

or by using a command-line switch. See the tables below for more

information.

Table 1.1   ANSI Predefined Macros

Macro Description

__DATE__ The compilation date of the current source file. The date is

a string literal of the form Mmm dd yyyy. The month name Mmm is the

same as for dates generated by the library function asctime declared

in TIME.H.

__FILE__ The name of the current source file. __FILE__ expands to a

string surrounded by double quotation marks.

__LINE__ The line number in the current source file. The line number

is a decimal integer constant. It can be altered with a #line

directive.

__STDC__ Indicates full conformance with the ANSI C standard. Defined

as the integer constant 1 only if the /Za compiler option is given and

you are not compiling C++ code; otherwise is undefined.

__TIME__ The most recent compilation time of the current source

file. The time is a string literal of the form hh:mm:ss.

__TIMESTAMP__ The date and time of the last modification of the

current source file, expressed as a string literal in the form Ddd Mmm

Date hh:mm:ss yyyy, where Ddd is the abbreviated day of the week and

Date is an integer from 1 to 31.

Table 1.2   Microsoft-Specific Predefined Macros

Macro Description

_CHAR_UNSIGNED Default char type is unsigned. Defined when /J is specified.

__cplusplus Defined for C++ programs only.

_CPPRTTI Defined for code compiled with /GR (Enable Run-Time Type

Information).

_CPPUNWIND Defined for code compiled with /GX (Enable Exception

Handling).

_DLL Defined when /MD or /MDd (Multithread DLL) is specified.

_M_ALPHA Defined for DEC ALPHA platforms. It is defined as 1 by the

ALPHA compiler, and it is not defined if another compiler is used.

_M_IX86 Defined for x86 processors. See Table 1.3 for more details.

_M_MPPC Defined for Power Macintosh platforms. Default is 601

(/QP601). See Table 1.4 for more details.

_M_MRX000 Defined for MIPS platforms. Default is 4000 (/QMR4000). See

Table 1.5 for more details.

_M_PPC Defined for PowerPC platforms. Default is 604 (/QP604). See

Table 1.6 for more details.

_MFC_VER Defines the MFC version. Defined as 0x0421 for Microsoft

Foundation Class Library 4.21. Always defined.

_MSC_EXTENSIONS This macro is defined when compiling with the /Ze

compiler option (the default).  Its value, when defined, is 1.

_MSC_VER Defines the compiler version. Defined as 1200 for Microsoft

Visual C++ 6.0. Always defined.

_MT Defined when /MD or /MDd (Multithreaded DLL) or /MT or /MTd

(Multithreaded) is specified.

_WIN32 Defined for applications for Win32®. Always defined.

As shown in following tables, the compiler generates a value for the

preprocessor identifiers that reflect the processor option specified.

Table 1.3   Values for _M_IX86

Option in Developer Studio Command-Line Option Resulting Value

Blend /GB _M_IX86 = 500 (Default. Future compilers will emit a

different value to reflect the dominant processor.)

Pentium /G5 _M_IX86 = 500

Pentium Pro /G6 _M_IX86 = 600

80386 /G3 _M_IX86 = 300

80486 /G4 _M_IX86 = 400

Table 1.4   Values for _M_MPPC

Option in development environment Command-Line Option Resulting Value

PowerPC 601 /QP601 _M_MPPC = 601 (Default)

PowerPC 603 /QP603 _M_MPPC = 603

PowerPC 604 /QP604 _M_MPPC = 604

PowerPC 620 /QP620 _M_MPPC = 620

Table 1.5   Values for _M_MRX000

Option in Developer Studio Command-Line Option Resulting Value

R4000 /QMR4000 _M_MRX000 = 4000 (Default)

R4100 /QMR4100 _M_MRX000 = 4100

R4200 /QMR4200 _M_MRX000 = 4200

R4400 /QMR4400 _M_MRX000 = 4400

R4600 /QMR4600 _M_MRX000 = 4600

R10000 /QMR10000 _M_MRX000 = 10000

Table 1.6   Values for _M_PPC

Option in Developer Studio Command-Line Option Resulting Value

PowerPC 601 /QP601 _M_PPC = 601

PowerPC 603 /QP603 _M_PPC = 603

PowerPC 604 /QP604 _M_PPC = 604 (Default)

PowerPC 620 /QP620 _M_PPC = 620

_MSC_VER 

 Reports the major and minor versions of the compiler. For example, 1310 for Microsoft Visual C++ .NET 2003. 1310 represents version 13 and a 1.0 point release. The Visual C++ 2005 compiler version is 1400.

 Type cl /? at the command line to see the major and minor versions of your compiler along with the build number.

Aus http://developer.apple.com/technotes/tn2002/tn2071.html:

Predefined Macros

As specified in Apple's developer GNU C Preprocessor

documentation[43], the following macros are predefined in Mac OS X:

__OBJC__

    This macro is defined when you compile Objective-C .m files or

    Objective-C++ .mm files, or when you override the file extension

    with -ObjC or -ObjC++ flags.

__ASSEMBLER__

    This macro is defined when compiling .s files.

__NATURAL_ALIGNMENT__

    This macro is defined on systems that use natural alignment. When

    using natural alignment, an int is aligned on sizeof(int)

    boundary, a short int is aligned on sizeof(short) boundary, and so

    on. It's defined by default when you're compiling code for the

    PowerPC, SPARC, and HPPA. It's not defined when you use the

    -malign-mac68k compiler switch.

__STRICT_BSD__

    This macro is defined if the -bsd switch was specified when GNU C

    was invoked.

__MACH__

    This macro is defined if Mach system calls are supported.

__APPLE__

    This macro is defined in any Apple computer.

__APPLE_CC__

    This macro is set to an integer that represents the version number

    of the compiler. This lets you distinguish, for example, between

    compilers based on the same version of GCC, but with different bug

    fixes or features. Larger values denote later compilers.

__BIG_ENDIAN__

    This macro sets the target architecture to be a most significant

    bit. See the Endian Issues sections for more details.

Note: To define a section of code to be compiled on Mac OS X system

    you should define a section using __APPLE__ with __MACH__

    macros. The macro __UNIX__ is not supported in Mac OS X.