Cool little trick to show all the preset variables for your GCC/Clang compiler
Posted by jpluimers on 2016/08/30
Thanks David Berneda for sharing this a while ago:
Cool little trick to show all the preset variables for your GCC/Clang compiler:
clang -E -dM - < /dev/nullI’ve always wondered how to get these. Some are kind of surprising, especially since there are 320 of them, at least on my system.
On my system (Mavericks, I wish the sw_vers console tool would tell that): 170 lines.
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| #define OBJC_NEW_PROPERTIES 1 | |
| #define _LP64 1 | |
| #define __APPLE_CC__ 6000 | |
| #define __APPLE__ 1 | |
| #define __ATOMIC_ACQUIRE 2 | |
| #define __ATOMIC_ACQ_REL 4 | |
| #define __ATOMIC_CONSUME 1 | |
| #define __ATOMIC_RELAXED 0 | |
| #define __ATOMIC_RELEASE 3 | |
| #define __ATOMIC_SEQ_CST 5 | |
| #define __BLOCKS__ 1 | |
| #define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__ | |
| #define __CHAR16_TYPE__ unsigned short | |
| #define __CHAR32_TYPE__ unsigned int | |
| #define __CHAR_BIT__ 8 | |
| #define __CONSTANT_CFSTRINGS__ 1 | |
| #define __DBL_DENORM_MIN__ 4.9406564584124654e-324 | |
| #define __DBL_DIG__ 15 | |
| #define __DBL_EPSILON__ 2.2204460492503131e-16 | |
| #define __DBL_HAS_DENORM__ 1 | |
| #define __DBL_HAS_INFINITY__ 1 | |
| #define __DBL_HAS_QUIET_NAN__ 1 | |
| #define __DBL_MANT_DIG__ 53 | |
| #define __DBL_MAX_10_EXP__ 308 | |
| #define __DBL_MAX_EXP__ 1024 | |
| #define __DBL_MAX__ 1.7976931348623157e+308 | |
| #define __DBL_MIN_10_EXP__ (-307) | |
| #define __DBL_MIN_EXP__ (-1021) | |
| #define __DBL_MIN__ 2.2250738585072014e-308 | |
| #define __DECIMAL_DIG__ 21 | |
| #define __DYNAMIC__ 1 | |
| #define __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ 1090 | |
| #define __FINITE_MATH_ONLY__ 0 | |
| #define __FLT_DENORM_MIN__ 1.40129846e-45F | |
| #define __FLT_DIG__ 6 | |
| #define __FLT_EPSILON__ 1.19209290e-7F | |
| #define __FLT_EVAL_METHOD__ 0 | |
| #define __FLT_HAS_DENORM__ 1 | |
| #define __FLT_HAS_INFINITY__ 1 | |
| #define __FLT_HAS_QUIET_NAN__ 1 | |
| #define __FLT_MANT_DIG__ 24 | |
| #define __FLT_MAX_10_EXP__ 38 | |
| #define __FLT_MAX_EXP__ 128 | |
| #define __FLT_MAX__ 3.40282347e+38F | |
| #define __FLT_MIN_10_EXP__ (-37) | |
| #define __FLT_MIN_EXP__ (-125) | |
| #define __FLT_MIN__ 1.17549435e-38F | |
| #define __FLT_RADIX__ 2 | |
| #define __GCC_ATOMIC_BOOL_LOCK_FREE 2 | |
| #define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2 | |
| #define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2 | |
| #define __GCC_ATOMIC_CHAR_LOCK_FREE 2 | |
| #define __GCC_ATOMIC_INT_LOCK_FREE 2 | |
| #define __GCC_ATOMIC_LLONG_LOCK_FREE 2 | |
| #define __GCC_ATOMIC_LONG_LOCK_FREE 2 | |
| #define __GCC_ATOMIC_POINTER_LOCK_FREE 2 | |
| #define __GCC_ATOMIC_SHORT_LOCK_FREE 2 | |
| #define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1 | |
| #define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2 | |
| #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1 | |
| #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 1 | |
| #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1 | |
| #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1 | |
| #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1 | |
| #define __GNUC_MINOR__ 2 | |
| #define __GNUC_PATCHLEVEL__ 1 | |
| #define __GNUC_STDC_INLINE__ 1 | |
| #define __GNUC__ 4 | |
| #define __GXX_ABI_VERSION 1002 | |
| #define __GXX_RTTI 1 | |
| #define __INT16_TYPE__ short | |
| #define __INT32_TYPE__ int | |
| #define __INT64_C_SUFFIX__ LL | |
| #define __INT64_TYPE__ long long int | |
| #define __INT8_TYPE__ char | |
| #define __INTMAX_MAX__ 9223372036854775807L | |
| #define __INTMAX_TYPE__ long int | |
| #define __INTMAX_WIDTH__ 64 | |
| #define __INTPTR_TYPE__ long int | |
| #define __INTPTR_WIDTH__ 64 | |
| #define __INT_MAX__ 2147483647 | |
| #define __LDBL_DENORM_MIN__ 3.64519953188247460253e-4951L | |
| #define __LDBL_DIG__ 18 | |
| #define __LDBL_EPSILON__ 1.08420217248550443401e-19L | |
| #define __LDBL_HAS_DENORM__ 1 | |
| #define __LDBL_HAS_INFINITY__ 1 | |
| #define __LDBL_HAS_QUIET_NAN__ 1 | |
| #define __LDBL_MANT_DIG__ 64 | |
| #define __LDBL_MAX_10_EXP__ 4932 | |
| #define __LDBL_MAX_EXP__ 16384 | |
| #define __LDBL_MAX__ 1.18973149535723176502e+4932L | |
| #define __LDBL_MIN_10_EXP__ (-4931) | |
| #define __LDBL_MIN_EXP__ (-16381) | |
| #define __LDBL_MIN__ 3.36210314311209350626e-4932L | |
| #define __LITTLE_ENDIAN__ 1 | |
| #define __LONG_LONG_MAX__ 9223372036854775807LL | |
| #define __LONG_MAX__ 9223372036854775807L | |
| #define __LP64__ 1 | |
| #define __MACH__ 1 | |
| #define __MMX__ 1 | |
| #define __NO_INLINE__ 1 | |
| #define __NO_MATH_INLINES 1 | |
| #define __ORDER_BIG_ENDIAN__ 4321 | |
| #define __ORDER_LITTLE_ENDIAN__ 1234 | |
| #define __ORDER_PDP_ENDIAN__ 3412 | |
| #define __PIC__ 2 | |
| #define __POINTER_WIDTH__ 64 | |
| #define __PRAGMA_REDEFINE_EXTNAME 1 | |
| #define __PTRDIFF_TYPE__ long int | |
| #define __PTRDIFF_WIDTH__ 64 | |
| #define __REGISTER_PREFIX__ | |
| #define __SCHAR_MAX__ 127 | |
| #define __SHRT_MAX__ 32767 | |
| #define __SIG_ATOMIC_WIDTH__ 32 | |
| #define __SIZEOF_DOUBLE__ 8 | |
| #define __SIZEOF_FLOAT__ 4 | |
| #define __SIZEOF_INT128__ 16 | |
| #define __SIZEOF_INT__ 4 | |
| #define __SIZEOF_LONG_DOUBLE__ 16 | |
| #define __SIZEOF_LONG_LONG__ 8 | |
| #define __SIZEOF_LONG__ 8 | |
| #define __SIZEOF_POINTER__ 8 | |
| #define __SIZEOF_PTRDIFF_T__ 8 | |
| #define __SIZEOF_SHORT__ 2 | |
| #define __SIZEOF_SIZE_T__ 8 | |
| #define __SIZEOF_WCHAR_T__ 4 | |
| #define __SIZEOF_WINT_T__ 4 | |
| #define __SIZE_MAX__ 18446744073709551615UL | |
| #define __SIZE_TYPE__ long unsigned int | |
| #define __SIZE_WIDTH__ 64 | |
| #define __SSE2_MATH__ 1 | |
| #define __SSE2__ 1 | |
| #define __SSE3__ 1 | |
| #define __SSE_MATH__ 1 | |
| #define __SSE__ 1 | |
| #define __SSP__ 1 | |
| #define __SSSE3__ 1 | |
| #define __STDC_HOSTED__ 1 | |
| #define __STDC_UTF_16__ 1 | |
| #define __STDC_UTF_32__ 1 | |
| #define __STDC_VERSION__ 199901L | |
| #define __STDC__ 1 | |
| #define __UINTMAX_TYPE__ long unsigned int | |
| #define __USER_LABEL_PREFIX__ _ | |
| #define __VERSION__ "4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)" | |
| #define __WCHAR_MAX__ 2147483647 | |
| #define __WCHAR_TYPE__ int | |
| #define __WCHAR_WIDTH__ 32 | |
| #define __WINT_TYPE__ int | |
| #define __WINT_WIDTH__ 32 | |
| #define __amd64 1 | |
| #define __amd64__ 1 | |
| #define __apple_build_version__ 6000057 | |
| #define __block __attribute__((__blocks__(byref))) | |
| #define __clang__ 1 | |
| #define __clang_major__ 6 | |
| #define __clang_minor__ 0 | |
| #define __clang_patchlevel__ 0 | |
| #define __clang_version__ "6.0 (clang-600.0.57)" | |
| #define __core2 1 | |
| #define __core2__ 1 | |
| #define __llvm__ 1 | |
| #define __pic__ 2 | |
| #define __strong | |
| #define __tune_core2__ 1 | |
| #define __unsafe_unretained | |
| #define __weak __attribute__((objc_gc(weak))) | |
| #define __x86_64 1 | |
| #define __x86_64__ 1 |
–jeroen
via: Cool little trick to show all the preset variables for your GCC/Clang compiler:….
The Wiert Corner - irregular stream of stuff 
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