The predefined macros available for the Intel® C++ Compiler are described in the table below. The Architecture column indicates which Intel architecture supports the macro.
Predefined macros specified by the ISO/ANSI standard are not listed in the table. For a list of all macro definitions in effect, use the -E -dM options. For example:
prompt>icpc -E -dM prog1.cpp
Macro Name | Value | Architecture |
---|---|---|
__DATE__ | Current date | Both |
__ECC | 1 | Itanium® architecture only |
__EDG__ | 1 | Both |
__EDG_VERSION__ | 302 | Both |
__ELF__ | 1 | Both |
__extension__ | (no value) | Both |
__GNUC__ | 3 | Both |
__gnu_linux__ | 1 | Both |
__GNUC_MINOR__ | 2 | Both |
__GNUC_PATCHLEVEL__ | 0 | Both |
__gnu_linux__ | 1 | Both |
__GXX_ABI_VERSION | 102 | Both |
__HONOR_STD | 1 | IA-32 only |
__i386 | 1 | IA-32 only |
__i386__ | 1 | IA-32 only |
i386 | 1 | IA-32 only |
__ia64 | 1 | Itanium architecture only |
__ia64__ | 1 | Itanium architecture only |
ia64 | 1 | Itanium architecture only |
__ICC | 800 | IA-32 only |
__INTEL_COMPILER | 800 | Both |
_INTEGRAL_MAX_BITS | 64 | Itanium architecture only |
__itanium__ | 1 | Itanium architecture only |
__linux | 1 | Both |
__linux__ | 1 | Both |
linux | 1 | Both |
__LONG_DOUBLE_SIZE__ | 80 | IA-32 only |
__LONG_MAX__ | 9223372036854775807L | Itanium architecture only |
__lp64 | 1 | Itanium architecture only |
__LP64__ | 1 | Itanium architecture only |
_LP64 | 1 | Itanium architecture only |
__NO_INLINE__ | 1 | Both |
__NO_MATH_INLINES | 1 | Both |
__NO_STRING_INLINES | 1 | Both |
__OPTIMIZE__ | 1 | Both |
__PTRDIFF_TYPE__ | int on IA-32 long on Itanium architecture |
Both |
__QMSPP_ | 1 | IA-32 only |
__REGISTER_PREFIX__ | (no value) | Both |
__SIGNED_CHARS__ | 1 | Both |
__SIZE_TYPE__ | unsigned on IA-32 unsigned long on Itanium architecture |
Both |
__STDC__ | 1 | Both |
__STDC_HOSTED__ | 1 | Both |
__TIME__ | Current time | Both |
__unix | 1 | Both |
__unix__ | 1 | Both |
unix | 1 | Both |
__USER_LABEL_PREFIX__ | (no value) | Both |
__VERSION__ | Both | |
__WCHAR_TYPE__ | long int on IA-32 int on Itanium architecture |
Both |
__WINT_TYPE__ | unsigned int | Both |
Use the -Uname option to suppress any macro definition currently in effect for the specified name. The -U option performs the same function as an #undef preprocessor directive.