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Compiler-specific Features
Table 4-24 Predefined macros (continued)
Name Value When defined
__INTMAX_TYPE__ – In GNU mode. It defines the correct underlying type for the intmax_t
typedef.
__LINE__ num Always set. It is the source line number of the line of code containing
this macro.
__MODULE__ mod Contains the filename part of the value of __FILE__.
__NO_INLINE__ – When you specify the --no_inline option in GNU mode.
__OPTIMISE_LEVEL num Always set to 2 by default, unless you change the optimization level
using the -Onum option.
__OPTIMISE_SPACE – When you specify the -Ospace option.
__OPTIMISE_TIME – When you specify the -Otime option.
__OPTIMIZE__ – When -O1, -O2, or -O3 is specified in GNU mode.
__OPTIMIZE_SIZE__ – When -Ospace is specified in GNU mode.
__PLACEMENT_DELETE – In C++ mode to specify that placement delete (that is, an operator
delete corresponding to a placement operator new, to be called if the
constructor throws an exception) is enabled. This is only relevant when
using exceptions.
__PTRDIFF_TYPE__ – In GNU mode. It defines the correct underlying type for the ptrdiff_t
typedef.
__RTTI – In C++ mode when RTTI is enabled.
__sizeof_int 4 For sizeof(int), but available in preprocessor expressions.
__sizeof_long 4 For sizeof(long), but available in preprocessor expressions.
__sizeof_ptr 4 For sizeof(void *), but available in preprocessor expressions.
__SIZE_TYPE__ – In GNU mode. It defines the correct underlying type for the size_t
typedef.
__SOFTFP__ – If compiling to use the software floating-point calling standard and
library. Set when you specify the --fpu=softvfp option for ARM or
Thumb, or when you specify --fpu=softvfp+vfpv2 for Thumb.
__STDC__ – In all compiler modes.
__STDC_VERSION__ – Standard version information.
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