2.6.3. Generic Compiler Pre-Defined Macro Symbols

Table 2.8 Version-Related Predefined Macro Symbols

Symbol	Value Kind	Value / Description
__clang__	<constant>	Defined to 1 if compiler uses Clang-based front-end.
__clang_major__	<version>	Identifies major version number of Clang front-end.
__clang_minor__	<version>	Identifies minor version number of Clang front-end.
__clang_patchlevel__	<version>	Identifies patch number of Clang front-end.
__clang_version__	<string>	String representation of Clang front-end version identification.
__GNUC_MINOR__	<version>	2
__GNUC_PATCHLEVEL__	<version>	1
__GNUC__	<version>	4
__GXX_ABI_VERSION__	<version>	1002
__llvm__	<constant>	Defined to 1 if compiler uses LLVM back-end.
__VERSION__	<string>	Full string representation of Clang front-end version identification.

Table 2.9 C Language-Related Predefined Macro Symbols

Symbol	Value Kind	Value / Description
__GNUC_GNU_INLINE__	<constant>	Defined to 1 if functions declared inline are defined and externally visible in compiler generated object files if such functions are not declared static or extern.
__GNUC_STDC_INLINE__	<constant>	Defined to 1 if functions declared inline are defined and externally visible in compiler generated object files only if such functions are declared extern.
__STDC__	<constant>	Defined to 1 if the compiler conforms to ISO Standard C.
__STDC_HOSTED__	<constant>	Defined to 1 if the target of the compiler is a hosted environment in which the compiler package supplies standard C runtime libraries.
__STDC_UTF_16__	<constant>	Defined to 1 if char16_t type values are UTF-16 encoded.
__STDC_UTF_32__	<constant>	Defined to 1 if char32_t type values are UTF-32 encoded.
__STDC_VERSION__	<version>	Defined to the C Standard being applied for a given compilation based on the -std=<language> option. By default, tiarmclang assumes -std=gnu17 for C source files (<version>=201710L). *
__STRICT_ANSI__	<constant>	Defined to 1 if a strictly-conforming C language variant is specified as the argument to the -std option (c89/90/99/9x/11/1x/17/18).

• See Pre-defined Compiler Macros for a list of definitions of __STDC_VERSION__ that correspond to versions of the C language standards.

Table 2.10 C++ Language Standard Predefined Macro Symbol (__cplusplus)

Symbol	Value Kind	Value / Description
__cplusplus	<standard>	Indicates the C++ <standard> that is in effect for a given compilation, where <standard> is one of the following values: value => C++ Standard ------- ------------ 199711L C++98 199711L C++03 201103L C++11 201402L C++14 201703L C++17

• See Pre-defined Compiler Macros for a list of definitions of __cplusplus that correspond to versions of the C++ language standards.

Table 2.11 C++ Language Feature Test Predefined Macro Symbols

Symbol / Feature	Available	Value / Adoption
__cpp_aggregate_bases	C++17	201603L
__cpp_aggregate_nsdmi	C++14	201304L
__cpp_alias_templates	C++11	200704L
__cpp_aligned_new	C++17	201606L
__cpp_attributes	C++11	200809L
__cpp_binary_literals	C++14	201304L
__cpp_capture_star_this	C++17	201603L
__cpp_constexpr	C++11 / C++14 / C++17	200704L / 201304L / 201603L
__cpp_contexpr_in_decltype	C++11	201711L
__cpp_decltype	C++11	200707L
__cpp_decltype_auto	C++14	201304L
__cpp_deduction_guides	C++17	201703L
__cpp_delegating_constructors	C++11	200604L
__cpp_digit_separators	C++14	201309L
__cpp_enumerator_attributes	C++17	201411L
__cpp_fold_expressions	C++17	201603L
__cpp_generic_lambdas	C++14	201304L
__cpp_guaranteed_copy_elision	C++17	201606L
__cpp_hex_float	C++17	201603L
__cpp_if_constexpr	C++17	201606L
__cpp_impl_destroying_delete	C++98	201806L
__cpp_inheriting_constructors	C++11	201511L
__cpp_init_captures	C++14	201304L
__cpp_initializer_lists	C++11	200806L
__cpp_inline_variables	C++17	201606L
__cpp_lambdas	C++11	200907L
__cpp_namespace_attributes	C++17	201411L
__cpp_nested_namespace_definitions	C++17	201411L
__cpp_noexcept_function_type	C++17	201510L
__cpp_nontype_template_args	C++17	201411L
__cpp_nontype_template_parameter_auto	C++17	201606L
__cpp_nsdmi	C++11	200809L
__cpp_range_based_for	C++11 / C++17	200907L / 201603L
__cpp_raw_strings	C++11	200710L
__cpp_ref_qualifiers	C++11	200710L
__cpp_return_type_deduction	C++14	201304L
__cpp_rvalue_references	C++11	200610L
__cpp_static_assert	C++11 / C++17	200410L / 201411L
__cpp_structured_bindings	C++17	201606L
__cpp_template_auto	C++17	201606L
__cpp_threadsafe_static_init	C++98	200806L
__cpp_unicode_characters	C++11	200704L
__cpp_unicode_literals	C++11	200710L
__cpp_user_defined_literals	C++11	200809L
__cpp_variable_templates	C++14	201304L
__cpp_variadic_templates	C++11	200704L
__cpp_variadic_using	C++17	201611L

Table 2.12 Compiler Generated Object Format (__ELF__)

Symbol	Value Kind	Value / Description
__ELF__	<constant>	Defined to 1 if compiler generates object code that conforms to the ELF object file format (default).

Table 2.14 Predefined Macro Symbols Related to Endian-ness

Symbol	Value Kind	Value / Description
__BIG_ENDIAN__	<constant>	Defined to 1 if compiler has been instructed to generate big-endian object code.
__LITTLE_ENDIAN__	<constant>	Defined to 1 if compiler has been instructed to generate little-endian object code (default).
__BYTE_ORDER__	<constant>	Matches either __ORDER_BIG_ENDIAN__ (4321) or __ORDER_LITTLE_ENDIAN__ (1234) depending on the endian-ness assumed for a given compilation.
__ORDER_BIG_ENDIAN__	<constant>	4321
__ORDER_LITTLE_ENDIAN__	<constant>	1234

Table 2.15 Predefined Macro Symbols Related to Optimization

Symbol	Value Kind	Value / Description
__FAST_MATH__	<constant>	Defined to 1 if the -ffast-math or -ffp-mode=fast option is enabled (-ffast-math is implied when the deprecated -Ofast optimization level is specified on the compiler command-line).
_INLINE	<constant>	Defined to 1 if automatic inlining optimizations are enabled.
__NO_INLINE__	<constant>	Defined to 1 if automatic inlining optimizations are disabled.
__OPTIMIZE__	<constant>	Defined to 1 if optimization is in use (-O[123szg]).
__OPTIMIZE_SIZE__	<constant>	Defined to 1 if optimizations intended to reduce compiler- generated code size are in use (-Os or -Oz option).

Table 2.17 Predefined Macro Symbols Related to Scalar Types

Symbol	Value Kind	Value / Description
__BIGGEST_ALIGNMENT__	<bytes>	Indicates the largest alignment in <bytes> ever used for any data type on the Arm processor being compiled for. For Cortex-M0/M0+/ M3/M4/M33/R4/R5, <bytes> = 8.
__CHAR16_TYPE__	<type>	unsigned short
__CHAR32_TYPE__	<type>	unsigned int
__CHAR_BIT__	<bits>	8
__CHAR_UNSIGNED__	<constant>	Defined to 1 if “plain” char types (not qualified with a “signed” or “unsigned” keyword) are interpreted by the compiler to be unsigned.
__INT8_FMTd__	<string>	“hhd”
__INT8_FMTi__	<string>	“hhi”
__INT8_MAX__	<constant>	127
__INT8_TYPE__	<type>	signed char
__UINT8_FMTX__	<string>	“hhX”
__UINT8_FMTo__	<string>	“hho”
__UINT8_FMTu__	<string>	“hhu”
__UINT8_FMTx__	<string>	“hhx”
__UINT8_MAX__	<constant>	255
__UINT8_TYPE__	<type>	unsigned char
__SCHAR_MAX__	<constant>	127
__INT_FAST8_FMTd__	<string>	“hhd”
__INT_FAST8_FMTi__	<string>	“hhi”
__INT_FAST8_MAX__	<constant>	127
__INT_FAST8_TYPE__	<type>	signed char
__UINT_FAST8_FMTX__	<string>	“hhX”
__UINT_FAST8_FMTo__	<string>	“hho”
__UINT_FAST8_FMTu__	<string>	“hhu”
__UINT_FAST8_FMTx__	<string>	“hhx”
__UINT_FAST8_MAX__	<constant>	255
__UINT_FAST8_TYPE__	<type>	unsigned char
__INT_LEAST8_FMTd__	<string>	“hhd”
__INT_LEAST8_FMTi__	<string>	“hhi”
__INT_LEAST8_MAX__	<constant>	127
__INT_LEAST8_TYPE__	<type>	signed char
__UINT_LEAST8_FMTX__	<string>	“hhX”
__UINT_LEAST8_FMTo__	<string>	“hho”
__UINT_LEAST8_FMTu__	<string>	“hhu”
__UINT_LEAST8_FMTx__	<string>	“hhx”
__UINT_LEAST8_MAX__	<constant>	255
__UINT_LEAST8_TYPE__	<type>	unsigned char
__INT16_FMTd__	<string>	“hd”
__INT16_FMTi__	<string>	“hi”
__INT16_MAX__	<constant>	32767
__INT16_TYPE__	<type>	short
__UINT16_FMTX__	<string>	“hX”
__UINT16_FMTo__	<string>	“ho”
__UINT16_FMTu__	<string>	“hu”
__UINT16_FMTx__	<string>	“hx”
__UINT16_MAX__	<constant>	65535
__UINT16_TYPE__	<type>	unsigned short
__SHRT_MAX__	<constant>	32767
__SIZEOF_SHORT__	<bytes>	4
__INT_FAST16_FMTd__	<string>	“hd”
__INT_FAST16_FMTi__	<string>	“hi”
__INT_FAST16_MAX__	<constant>	32767
__INT_FAST16_TYPE__	<type>	short
__UINT_FAST16_FMTX__	<string>	“hX”
__UINT_FAST16_FMTo__	<string>	“ho”
__UINT_FAST16_FMTu__	<string>	“hu”
__UINT_FAST16_FMTx__	<string>	“hx”
__UINT_FAST16_MAX__	<constant>	65535
__UINT_FAST16_TYPE__	<type>	unsigned short
__INT_LEAST16_FMTd__	<string>	“hd”
__INT_LEAST16_FMTi__	<string>	“hi”
__INT_LEAST16_MAX__	<constant>	32767
__INT_LEAST16_TYPE__	<type>	short
__UINT_LEAST16_FMTX__	<string>	“hX”
__UINT_LEAST16_FMTo__	<string>	“ho”
__UINT_LEAST16_FMTu__	<string>	“hu”
__UINT_LEAST16_FMTx__	<string>	“hx”
__UINT_LEAST16_MAX__	<constant>	65535
__UINT_LEAST16_TYPE__	<type>	unsigned short
__INT32_FMTd__	<string>	“d”
__INT32_FMTi__	<string>	“i”
__INT32_MAX__	<constant>	2147483647
__INT32_TYPE__	<type>	int
__UINT32_C_SUFFIX__	<text>	U
__UINT32_FMTX__	<string>	“X”
__UINT32_FMTo__	<string>	“o”
__UINT32_FMTu__	<string>	“u”
__UINT32_FMTx__	<string>	“x”
__UINT32_MAX__	<constant>	4294967295U
__UINT32_TYPE__	<type>	unsigned int
__INT_MAX__	<constant>	2147483647
__SIZEOF_INT__	<bytes>	4
__LONG_MAX__	<constant>	2147483647
__SIZEOF_LONG__	<bytes>	4
__INT_FAST32_FMTd__	<string>	“d”
__INT_FAST32_FMTi__	<string>	“i”
__INT_FAST32_MAX__	<constant>	2147483647
__INT_FAST32_TYPE__	<type>	int
__UINT_FAST32_FMTX__	<string>	“X”
__UINT_FAST32_FMTo__	<string>	“o”
__UINT_FAST32_FMTu__	<string>	“u”
__UINT_FAST32_FMTx__	<string>	“x”
__UINT_FAST32_MAX__	<constant>	4294967295U
__UINT32_TYPE__	<type>	unsigned int
__INT_LEAST32_FMTd__	<string>	“d”
__INT_LEAST32_FMTi__	<string>	“i”
__INT_LEAST32_MAX__	<constant>	2147483647
__INT_LEAST32_TYPE__	<type>	int
__UINT_LEAST32_FMTX__	<string>	“X”
__UINT_LEAST32_FMTo__	<string>	“o”
__UINT_LEAST32_FMTu__	<string>	“u”
__UINT_LEAST32_FMTx__	<string>	“x”
__UINT_LEAST32_MAX__	<constant>	4294967295U
__UINT_LEAST32_TYPE__	<type>	unsigned int
__INT64_C_SUFFIX__	<text>	LL
__INT64_FMTd__	<string>	“lld”
__INT64_FMTi__	<string>	“lli”
__INT64_MAX__	<constant>	9223372036854775807LL
__INT64_TYPE__	<type>	long long int
__UINT64_C_SUFFIX__	<text>	ULL
__UINT64_FMTX__	<string>	“llX”
__UINT64_FMTo__	<string>	“llo”
__UINT64_FMTu__	<string>	“llu”
__UINT64_FMTx__	<string>	“llx”
__UINT64_MAX__	<constant>	18446744073709551615ULL
__UINT64_TYPE__	<type>	long long unsigned int
__UINT8_TYPE__	<type>	unsigned char
__SCHAR_MAX__	<constant>	127
__INT_FAST8_FMTd__	<string>	“hhd”
__INT_FAST8_FMTi__	<string>	“hhi”
__INT_FAST8_MAX__	<constant>	127
__INT_FAST8_TYPE__	<type>	signed char
__UINT8_FMTX__	<string>	“hhX”
__UINT8_FMTo__	<string>	“hho”
__UINT8_FMTu__	<string>	“hhu”
__UINT8_FMTx__	<string>	“hhx”
__UINT8_MAX__	<constant>	255
__UINT8_TYPE__	<type>	unsigned char
__SCHAR_MAX__	<constant>	127
__INT_FAST8_FMTd__	<string>	“hhd”
__INT_FAST8_FMTi__	<string>	“hhi”
__INT_FAST8_MAX__	<constant>	127
__INT_FAST8_TYPE__	<type>	signed char
__UINT_FAST8_FMTX__	<string>	“hhX”
__UINT_FAST8_FMTo__	<string>	“hho”
__UINT_FAST8_FMTu__	<string>	“hhu”
__UINT_FAST8_FMTx__	<string>	“hhx”
__UINT_FAST8_MAX__	<constant>	255
__UINT_FAST8_TYPE__	<type>	unsigned char
__INT_LEAST8_FMTd__	<string>	“hhd”
__INT_LEAST8_FMTi__	<string>	“hhi”
__INT_LEAST8_MAX__	<constant>	127
__INT_LEAST8_TYPE__	<type>	signed char
__UINT_LEAST8_FMTX__	<string>	“hhX”
__UINT_LEAST8_FMTo__	<string>	“hho”
__UINT_LEAST8_FMTu__	<string>	“hhu”
__UINT_LEAST8_FMTx__	<string>	“hhx”
__UINT_LEAST8_MAX__	<constant>	255
__UINT_LEAST8_TYPE__	<type>	unsigned char
__INT16_FMTd__	<string>	“hd”
__INT16_FMTi__	<string>	“hi”
__INT16_MAX__	<constant>	32767
__INT16_TYPE__	<type>	short
__UINT16_FMTX__	<string>	“hX”
__UINT16_FMTo__	<string>	“ho”
__UINT16_FMTu__	<string>	“hu”
__UINT16_FMTx__	<string>	“hx”
__UINT16_MAX__	<constant>	65535
__UINT16_TYPE__	<type>	unsigned short
__SHRT_MAX__	<constant>	32767
__SIZEOF_SHORT__	<bytes>	4
__INT_FAST16_FMTd__	<string>	“hd”
__INT_FAST16_FMTi__	<string>	“hi”
__INT_FAST16_MAX__	<constant>	32767
__INT_FAST16_TYPE__	<type>	short
__UINT_FAST16_FMTX__	<string>	“hX”
__UINT_FAST16_FMTo__	<string>	“ho”
__UINT_FAST16_FMTu__	<string>	“hu”
__UINT_FAST16_FMTx__	<string>	“hx”
__UINT_FAST16_MAX__	<constant>	65535
__UINT_FAST16_TYPE__	<type>	unsigned short
__INT_LEAST16_FMTd__	<string>	“hd”
__INT_LEAST16_FMTi__	<string>	“hi”
__INT_LEAST16_MAX__	<constant>	32767
__INT_LEAST16_TYPE__	<type>	short
__UINT_LEAST16_FMTX__	<string>	“hX”
__UINT_LEAST16_FMTo__	<string>	“ho”
__UINT_LEAST16_FMTu__	<string>	“hu”
__UINT_LEAST16_FMTx__	<string>	“hx”
__UINT_LEAST16_MAX__	<constant>	65535
__UINT_LEAST16_TYPE__	<type>	unsigned short
__INT32_FMTd__	<string>	“d”
__INT32_FMTi__	<string>	“i”
__INT32_MAX__	<constant>	2147483647
__INT32_TYPE__	<type>	int
__UINT32_C_SUFFIX__	<text>	U
__UINT32_FMTX__	<string>	“X”
__UINT32_FMTo__	<string>	“o”
__UINT32_FMTu__	<string>	“u”
__UINT32_FMTx__	<string>	“x”
__UINT32_MAX__	<constant>	4294967295U
__UINT32_TYPE__	<type>	unsigned int
__INT_MAX__	<constant>	2147483647
__SIZEOF_INT__	<bytes>	4
__LONG_MAX__	<constant>	2147483647
__SIZEOF_LONG__	<bytes>	4
__INT_FAST32_FMTd__	<string>	“d”
__INT_FAST32_FMTi__	<string>	“i”
__INT_FAST32_MAX__	<constant>	2147483647
__INT_FAST32_TYPE__	<type>	int
__UINT_FAST32_FMTX__	<string>	“X”
__UINT_FAST32_FMTo__	<string>	“o”
__UINT_FAST32_FMTu__	<string>	“u”
__UINT_FAST32_FMTx__	<string>	“x”
__UINT_FAST32_MAX__	<constant>	4294967295U
__UINT32_TYPE__	<type>	unsigned int
__INT_LEAST32_FMTd__	<string>	“d”
__INT_LEAST32_FMTi__	<string>	“i”
__INT_LEAST32_MAX__	<constant>	2147483647
__INT_LEAST32_TYPE__	<type>	int
__UINT_LEAST32_FMTX__	<string>	“X”
__UINT_LEAST32_FMTo__	<string>	“o”
__UINT_LEAST32_FMTu__	<string>	“u”
__UINT_LEAST32_FMTx__	<string>	“x”
__UINT_LEAST32_MAX__	<constant>	4294967295U
__UINT_LEAST32_TYPE__	<type>	unsigned int
__INT64_C_SUFFIX__	<text>	LL
__INT64_FMTd__	<string>	“lld”
__INT64_FMTi__	<string>	“lli”
__INT64_MAX__	<constant>	9223372036854775807LL
__INT64_TYPE__	<type>	long long int
__UINT64_C_SUFFIX__	<text>	ULL
__UINT64_FMTX__	<string>	“llX”
__UINT64_FMTo__	<string>	“llo”
__UINT64_FMTu__	<string>	“llu”
__UINT64_FMTx__	<string>	“llx”
__UINT64_MAX__	<constant>	18446744073709551615ULL
__UINT64_TYPE__	<type>	long long unsigned int
__LONG_LONG_MAX__	<constant>	9223372036854775807LL
__SIZEOF_LONG_LONG__	<bytes>	8
__INT_FAST64_FMTd__	<string>	“lld”
__INT_FAST64_FMTi__	<string>	“lli”
__INT_FAST64_MAX__	<constant>	9223372036854775807LL
__INT_FAST64_TYPE__	<type>	long long int
__UINT_FAST64_FMTX__	<string>	“llX”
__UINT_FAST64_FMTo__	<string>	“llo”
__UINT_FAST64_FMTu__	<string>	“llu”
__UINT_FAST64_FMTx__	<string>	“llx”
__UINT_FAST64_MAX__	<constant>	18446744073709551615ULL
__UINT_FAST64_TYPE__	<type>	long long unsigned int
__INT_LEAST64_FMTd__	<string>	“lld”
__INT_LEAST64_FMTi__	<string>	“lli”
__INT_LEAST64_MAX__	<constant>	9223372036854775807LL
__INT_LEAST64_TYPE__	<type>	long long int
__INT_LEAST64_WIDTH__	<constant>	64
__UINT_LEAST64_FMTX__	<string>	“llX”
__UINT_LEAST64_FMTo__	<string>	“llo”
__UINT_LEAST64_FMTu__	<string>	“llu”
__UINT_LEAST64_FMTx__	<string>	“llx”
__UINT_LEAST64_MAX__	<constant>	18446744073709551615ULL
__UINT_LEAST64_TYPE__	<type>	long long unsigned int
__INTMAX_C_SUFFIX__	<text>	LL
__INTMAX_FMTd__	<string>	“lld”
__INTMAX_FMTi__	<string>	“lli”
__INTMAX_MAX__	<constant>	9223372036854775807LL
__INTMAX_TYPE__	<type>	long long int
__INTMAX_WIDTH__	<bits>	64
__UINTMAX_C_SUFFIX__	<text>	ULL
__UINTMAX_FMTX__	<string>	“llX”
__UINTMAX_FMTo__	<string>	“llo”
__UINTMAX_FMTu__	<string>	“llu”
__UINTMAX_FMTx__	<string>	“llx”
__UINTMAX_MAX__	<constant>	18446744073709551615ULL
__UINTMAX_TYPE__	<type>	long long unsigned int
__UINTMAX_WIDTH__	<constant>	64
__INTPTR_FMTd__	<string>	“d”
__INTPTR_FMTi__	<string>	“i”
__INTPTR_MAX__	<constant>	2147483647
__INTPTR_TYPE__	<type>	int
__INTPTR_WIDTH__	<bits>	32
__UINTPTR_FMTX__	<string>	“X”
__UINTPTR_FMTo__	<string>	“o”
__UINTPTR_FMTu__	<string>	“u”
__UINTPTR_FMTx__	<string>	“x”
__UINTPTR_MAX__	<constant>	4294967295U
__UINTPTR_TYPE__	<type>	unsigned int
__UINTPTR_WIDTH__	<constant>	32
__POINTER_WIDTH__	<constant>	32
_ILP32	<constant>	Defined to 1 if pointer type width and long type width is 32-bits.
__ILP32__	<constant>	Defined to 1 if pointer type width and long type width is 32-bits.
__SIZEOF_POINTER__	<bytes>	4
__PTRDIFF_FMTd__	<string>	“d”
__PTRDIFF_FMTi__	<string>	“i”
__PTRDIFF_MAX__	<constant>	2147483647
__PTRDIFF_TYPE__	<type>	int
__PTRDIFF_WIDTH__	<bits>	32
__SIZEOF_PTRDIFF_T__	<bytes>	4
__SIZE_FMTX__	<string>	“X”
__SIZE_FMTo__	<string>	“o”
__SIZE_FMTu__	<string>	“u”
__SIZE_FMTx__	<string>	“X”
__SIZE_MAX__	<constant>	4294967295U
__SIZE_TYPE__	<type>	unsigned int
__SIZE_WIDTH__	<bits>	32
__SIZEOF_SIZE_T__	<bytes>	4
__WCHAR_MAX__	<constant>	2147483647
__WCHAR_TYPE__	<constant>	int
__WCHAR_WIDTH__	<bits>	32
__SIZEOF_WCHAR_T__	<bytes>	4
__WINT_MAX__	<constant>	2147483647
__WINT_TYPE__	<constant>	int
__WINT_WIDTH__	<bits>	32
__SIZEOF_WINT_T__	<bytes>	4
__FLT_DECIMAL_DIG__	<digits>	9
__FLT_DENORM_MIN__	<constant>	1.40129846e-45F
__FLT_DIG__	<digits>	6
__FLT_EPSILON__	<constant>	1.19209290e-7F
__FLT_MANT_DIG__	<bits>	24
__FLT_MAX_10_EXP__	<constant>	38
__FLT_MAX_EXP__	<constant>	128
__FLT_MAX__	<constant>	3.40282347e+38F
__FLT_MIN_10_EXP__	<constant>	-37
__FLT_MIN_EXP__	<constant>	-125
__FLT_MIN__	<constant>	1.17549435e-38F
__FLT_RADIX__	<constant>	2
__SIZEOF_FLOAT__	<bytes>	4
__DBL_DECIMAL_DIG__	<digits>	17
__DBL_DENORM_MIN__	<constant>	4.9406564584124654e-324
__DBL_DIG__	<digits>	15
__DBL_EPSILON__	<constant>	2.2204460492503131e-16
__DBL_MANT_DIG__	<bits>	53
__DBL_MAX_10_EXP__	<constant>	308
__DBL_MAX_EXP__	<constant>	1024
__DBL_MAX__	<constant>	1.7976931348623157e+308
__DBL_MIN_10_EXP__	<constant>	-307
__DBL_MIN_EXP__	<constant>	-1021
__DBL_MIN__	<constant>	2.2250738585072014e-308
__DECIMAL_DIG__	<constant>	__LDBL_DECIMAL_DIG__
__LDBL_DECIMAL_DIG__	<digits>	17
__LDBL_DENORM_MIN__	<constant>	4.9406564584124654e-324
__LDBL_DIG__	<digits>	15
__LDBL_EPSILON__	<constant>	2.2204460492503131e-16
__LDBL_MANT_DIG__	<bits>	53
__LDBL_MAX_10_EXP__	<constant>	308
__LDBL_MAX_EXP__	<constant>	1024
__LDBL_MAX__	<constant>	1.7976931348623157e+308
__LDBL_MIN_10_EXP__	<constant>	-307
__LDBL_MIN_EXP__	<constant>	-1021
__LDBL_MIN__	<constant>	2.2250738585072014e-308