This is from a Windows XP box with MinGW (gcc 3.4.5):
'uname' or 'uname -s': MINGW32_NT-5.1
'uname -p': unknown
'uname -a': MINGW32_NT-5.1 COMPUTER 1.0.11(0.46/3/2) 2009-07-11 17:46 i686 Msys
echo | gcc -E -dM -:
#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-vista special r3)" #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))
HTH, Uwe.