Re: predifined macros ?

[E. Robert Tisdale]

Ulrich Lauther wrote:

> How can I find out the names and values of predefined values?
>
> I tried g++ -dM test.C
>
> but that doesn't produce any output.

> touch empty.cc
> g++ -E -dM empty.cc
#define __DBL_MIN_EXP__ (-1021)
#define __BIG_ENDIAN__ 1
#define __FLT_MIN__ 1.17549435e-38F
#define __CHAR_BIT__ 8
#define __WCHAR_MAX__ 2147483647
#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
#define __FLT_EVAL_METHOD__ 0
#define __powerpc__ 1
#define __unix__ 1
#define unix 1
#define __SIZE_TYPE__ unsigned int
#define __ELF__ 1
#define __DBL_MIN_10_EXP__ (-307)
#define __FINITE_MATH_ONLY__ 0
#define __GNUC_PATCHLEVEL__ 3
#define __FLT_RADIX__ 2
#define __LDBL_EPSILON__ 2.2204460492503131e-16L
#define __SHRT_MAX__ 32767
#define __LDBL_MAX__ 1.7976931348623157e+308L
#define _ARCH_PPC 1
#define __linux 1
#define __CHAR_UNSIGNED__ 1
#define __LDBL_MAX_EXP__ 1024
#define __LONG_MAX__ 2147483647L
#define __linux__ 1
#define __unix 1
#define __SCHAR_MAX__ 127
#define __DBL_DIG__ 15
#define _BIG_ENDIAN 1
#define __USER_LABEL_PREFIX__
#define linux 1
#define __PPC 1
#define __STDC_HOSTED__ 1
#define __EXCEPTIONS 1
#define __LDBL_MANT_DIG__ 53
#define __FLT_EPSILON__ 1.19209290e-7F
#define __GXX_WEAK__ 1
#define _CALL_SYSV 1
#define __LDBL_MIN__ 2.2250738585072014e-308L
#define __WCHAR_TYPE__ long int
#define __FLT_DIG__ 6
#define __powerpc 1
#define __FLT_MAX_10_EXP__ 38
#define __INT_MAX__ 2147483647
#define __gnu_linux__ 1
#define __FLT_MAX_EXP__ 128
#define __DECIMAL_DIG__ 17
#define __DBL_MANT_DIG__ 53
#define __WINT_TYPE__ unsigned int
#define __GNUC__ 3
#define __LDBL_MIN_EXP__ (-1021)
#define __LDBL_MAX_10_EXP__ 308
#define __DBL_EPSILON__ 2.2204460492503131e-16
#define PPC 1
#define __DBL_MAX__ 1.7976931348623157e+308
#define __cplusplus 1
#define powerpc 1
#define __DEPRECATED 1
#define __DBL_MAX_EXP__ 1024
#define __FLT_DENORM_MIN__ 1.40129846e-45F
#define __GNUG__ 3
#define __LONG_LONG_MAX__ 9223372036854775807LL
#define __PPC__ 1
#define __FLT_MAX__ 3.40282347e+38F
#define __GXX_ABI_VERSION 102
#define __FLT_MIN_10_EXP__ (-37)
#define __FLT_MIN_EXP__ (-125)
#define __GNUC_MINOR__ 3
#define __DBL_MAX_10_EXP__ 308
#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L
#define __DBL_MIN__ 2.2250738585072014e-308
#define __PTRDIFF_TYPE__ int
#define __LDBL_MIN_10_EXP__ (-307)
#define __REGISTER_PREFIX__
#define __LDBL_DIG__ 15
#define __NO_INLINE__ 1
#define _GNU_SOURCE 1
#define __FLT_MANT_DIG__ 24
#define __VERSION__ "3.3.3 (Yellow Dog Linux 3.3.3-16.ydl.4)"