The IntelŪ C++ Compiler supports the predefined macros listed in the table below. The compiler also includes predefined macros specified by the ISO/ANSI standard.
The following designations apply:
| Label | Meaning |
|---|---|
| i32 | Supported on IntelŪ IA-32 compilers |
| i32em | Supported on IntelŪ EM64T compilers |
| i64 | Supported on ItaniumŪ compilers |
| Macro Name | Value | i32 | i32em | i64 |
|---|---|---|---|---|
| __ARRAY_OPERATORS | 1 | X | X | X |
| __BASE_FILE__ | Name of source file | X | X | X |
| _BOOL | 1 | X | X | X |
| __cplusplus | 1 | X | X | X |
| __DEPRECATED | 1 | X | X | X |
| __EDG__ | 1 | X | X | X |
| __EDG_VERSION__ | 304 | X | X | X |
| __ELF__ | 1 | X | X | X |
| __extension__ | X | X | X | |
| __EXCEPTIONS | Defined as 1 when -fno-exceptions is not used. | X | X | X |
| __GNUC__ | 2 - if gcc version is less than 3.2 3 - if gcc version is 3.2, 3.3, or 3.4 4 - if gcc version is 4.x |
X | X | X |
| __gnu_linux__ | 1 | X | X | X |
| __GNUC_MINOR__ | 95 - if gcc version is less than 3.2 2 - if gcc version is 3.2 3 - if gcc version is 3.3 4 - if gcc version is 3.4 |
X | X | X |
| __GNUC_PATCHLEVEL__ | 3 - if gcc version is 3.x | X | X | X |
| __GXX_ABI_VERSION | 102 | X | X | X |
| __HONOR_STD | 1 | X | X | |
| __i386 | 1 | X | ||
| __i386__ | 1 | X | ||
| i386 | 1 | X | ||
| __ia64 | 1 | X | ||
| __ia64__ | 1 | X | ||
| ia64 (deprecated) | 1 | X | ||
| __ICC | 910 | X | X | |
| _INTEGRAL_MAX_BITS | 64 | X | ||
| __INTEL_COMPILER | 910 | X | X | X |
| __INTEL_COMPILER_BUILD_DATE | YYYYMMDD | X | X | X |
| __INTEL_CXXLIB_ICC | Defined as 1 when -cxxlib-icc option is specified during compilation. | X | X | |
| __INTEL_RTTI__ | Defined as 1 when -fno-rtti is not specified. | X | X | X |
| __INTEL_STRICT_ANSI__ | Defined as 1 when -strict-ansi is specified. | X | X | X |
| __itanium__ | 1 | X | ||
| __linux | 1 | X | X | X |
| __linux__ | 1 | X | X | X |
| linux | 1 | X | X | X |
| __LONG_DOUBLE_SIZE__ | 80 | X | X | X |
| __LONG_MAX__ | 9223372036854775807L | X | X | |
| __lp64 | 1 | X | ||
| __LP64__ | 1 | X | X | |
| _LP64 | 1 | X | X | |
| _MT | 1 | X | ||
| __MMX__ | 1 | X | ||
| __NO_INLINE__ | 1 | X | X | X |
| __NO_MATH_INLINES | 1 | X | X | X |
| __NO_STRING_INLINES | 1 | X | X | X |
| _OPENMP | Defined as 200505 when -openmp is specified. | X | X | X |
| __OPTIMIZE__ | 1 | X | X | X |
| __pentium4 | 1 | X | ||
| __pentium4__ | 1 | X | ||
| __PIC__ | Defined as 1 when -fPIC is specified. | X | X | X |
| __pic__ | Defined as 1 when -fPIC is specified. | X | X | X |
| _PGO_INSTRUMENT | Defined as 1 when -prof-gen[x] is specified. | X | X | X |
| _PLACEMENT_DELETE | 1 | X | X | X |
| __PTRDIFF_TYPE__ | int on IA-32 long on EM64T long on Itanium architecture |
X | X | X |
| __REGISTER_PREFIX__ | X | X | X | |
| __SIGNED_CHARS__ | 1 | X | X | X |
| __SIZE_TYPE__ | unsigned on IA-32 unsigned long on EM64T unsigned long on Itanium architecture |
X | X | X |
| __SSE__ | 1 | X | ||
| __SSE2__ | 1 | X | ||
| __unix | 1 | X | X | X |
| __unix__ | 1 | X | X | X |
| unix | 1 | X | X | X |
| __USER_LABEL_PREFIX__ | X | X | X | |
| __VERSION__ | Intel(R) C++ gcc 3.0 mode | X | X | X |
| __WCHAR_T | 1 | X | X | X |
| __WCHAR_TYPE__ | long int on IA-32 int on EM64T int on Itanium architecture |
X | X | X |
| __WINT_TYPE__ | unsigned int | X | X | X |
| __x86_64 | 1 | X | ||
| __x86_64__ | 1 | X |