Mingw下查看所有预定义宏

$ gcc -dM -E - < nul

#define __DBL_MIN_EXP__ (-1021)
#define __FLT_MIN__ 1.17549435e-38F
#define __CHAR_BIT__ 8
#define __WCHAR_MAX__ 65535U
#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
#define __FLT_EVAL_METHOD__ 2
#define __DBL_MIN_10_EXP__ (-307)
#define __FINITE_MATH_ONLY__ 0
#define __GNUC_PATCHLEVEL__ 5
#define _stdcall __attribute__((__stdcall__))
#define __SHRT_MAX__ 32767
#define __LDBL_MAX__ 1.18973149535723176502e+4932L
#define __LDBL_MAX_EXP__ 16384
#define __SCHAR_MAX__ 127
#define __USER_LABEL_PREFIX__ _
#define __STDC_HOSTED__ 1
#define __WIN32 1
#define __LDBL_HAS_INFINITY__ 1
#define __DBL_DIG__ 15
#define __FLT_EPSILON__ 1.19209290e-7F
#define __tune_i686__ 1
#define __LDBL_MIN__ 3.36210314311209350626e-4932L
#define __DECIMAL_DIG__ 21
#define __LDBL_HAS_QUIET_NAN__ 1
#define __GNUC__ 3
#define _cdecl __attribute__((__cdecl__))
#define __DBL_MAX__ 1.7976931348623157e+308
#define __WINNT 1
#define __DBL_HAS_INFINITY__ 1
#define __WINNT__ 1
#define _fastcall __attribute__((__fastcall__))
#define __USING_SJLJ_EXCEPTIONS__ 1
#define __DBL_MAX_EXP__ 1024
#define __WIN32__ 1
#define __LONG_LONG_MAX__ 9223372036854775807LL
#define __GXX_ABI_VERSION 1002
#define __FLT_MIN_EXP__ (-125)
#define __DBL_MIN__ 2.2250738585072014e-308
#define __DBL_HAS_QUIET_NAN__ 1
#define __REGISTER_PREFIX__
#define __cdecl __attribute__((__cdecl__))
#define __NO_INLINE__ 1
#define __i386 1
#define __FLT_MANT_DIG__ 24
#define __VERSION__ "3.4.5 (mingw special)"
#define _WIN32 1
#define _X86_ 1
#define i386 1
#define __i386__ 1
#define __SIZE_TYPE__ unsigned int
#define __FLT_RADIX__ 2
#define __LDBL_EPSILON__ 1.08420217248550443401e-19L
#define __MSVCRT__ 1
#define __FLT_HAS_QUIET_NAN__ 1
#define __FLT_MAX_10_EXP__ 38
#define __LONG_MAX__ 2147483647L
#define __FLT_HAS_INFINITY__ 1
#define __stdcall __attribute__((__stdcall__))
#define __LDBL_MANT_DIG__ 64
#define __WCHAR_TYPE__ short unsigned int
#define __FLT_DIG__ 6
#define __INT_MAX__ 2147483647
#define WIN32 1
#define __MINGW32__ 1
#define __FLT_MAX_EXP__ 128
#define __DBL_MANT_DIG__ 53
#define __WINT_TYPE__ short unsigned int
#define __LDBL_MIN_EXP__ (-16381)
#define __LDBL_MAX_10_EXP__ 4932
#define __DBL_EPSILON__ 2.2204460492503131e-16
#define __tune_pentiumpro__ 1
#define __fastcall __attribute__((__fastcall__))
#define WINNT 1
#define __FLT_DENORM_MIN__ 1.40129846e-45F
#define __FLT_MAX__ 3.40282347e+38F
#define __FLT_MIN_10_EXP__ (-37)
#define __GNUC_MINOR__ 4
#define __DBL_MAX_10_EXP__ 308
#define __LDBL_DENORM_MIN__ 3.64519953188247460253e-4951L
#define __PTRDIFF_TYPE__ int
#define __LDBL_MIN_10_EXP__ (-4931)
#define __LDBL_DIG__ 18
#define __declspec(x) __attribute__((x))