22.4.1 32-Bit C/C++ Compiler Macros

The compiler defines a number of macros, most with the prefix “_MCHP_”, which characterize the various target specific options, the target processor and other aspects of the host environment.

_MCHP_SZINT 32 or 64, depending on command line options to set the size of an integer (-mint32 -mint64).
_MCHP_SZLONG 32 or 64, depending on command line options to set the size of an integer (-mlong32 -mlong64).
_MCHP_SZPTR 32 always since all pointers are 32 bits.
__mchp_no_float Defined if -mno-float specified.
__NO_FLOAT Defined if -mno-float specified.
__SOFT_FLOAT Defined if -mno-float not specified and the specified device does not feature a hardware Floating-Point Unit (FPU). Indicates that floating-point operations are supported via library calls.
__HARD_FLOAT Defined if -mno-float and -msoft-float are not specified and the specified device features a hardware Floating-Point Unit (FPU). Indicates that floating-point operations utilize the FPU.
__PIC32MX

__PIC32MX__

 Defined when a PIC32MX device is specified with the -mprocessor option.
__PIC32MZ Defined when a PIC32MZ device is specified with the -mprocessor option.
__PIC32_FEATURE_SET__ The compiler predefines a macro based on the features available for the selected device. These macros are intended to be used when writing code to take advantage of features available on newer devices while maintaining compatibility with older devices.

Examples: PIC32MX795F512L would use: __PIC32_FEATURE_SET__ == 795, and PIC32MX340F128H would use: __PIC32_FEATURE_SET__ == 340.

Examples: PIC32MZ2048ECH100 would use:

__PIC32_FEATURE_SET "EC" /* PIC32MZ2048ECH100 */

__PIC32_FEATURE_SET0 69 /* PIC32MZ2048ECH100 */

__PIC32_FEATURE_SET1 67 /* PIC32MZ2048ECH100 */
PIC32MX Defined if -ansi is not specified.
__LANGUAGE_ASSEMBLY

__LANGUAGE_ASSEMBLY__

_LANGUAGE_ASSEMBLY

 Defined if compiling a pre-processed assembly file (.S files).
LANGUAGE_ASSEMBLY Defined if compiling a pre-processed assembly file (.S files) and -ansi is not specified.
__LANGUAGE_C

__LANGUAGE_C__

_LANGUAGE_C

 Defined if compiling a C file.
LANGUAGE_C Defined if compiling a C file and -ansi is not specified.
__LANGUAGE_C_PLUS_PLUS

__cplusplus

_LANGUAGE_C_PLUS_PLUS__

 Defined if compiling a C++ file.
__EXCEPTIONS Defined if X++ exceptions are enabled.
__GXX_RTTI Defined if runtime type information is enabled.
__processor__ Where “processor” is the capitalized argument to the -mprocessor option. for example, -mprocessor=32mx12f3456 will define __32MX12F3456__
__XC Always defined to indicate that this is a Microchip XC compiler.
__XC32 Always defined to indicate this the XC32 compiler.
__VERSION__ The __VERSION__ macro expands to a string constant describing the compiler in use. Do not rely on its contents having any particular form, but it should contain at least the release number. Use the __XC32_VERSION macro for a numeric version number.
__XC32_VERSION

or __C32_VERSION__

 The C compiler defines the constant __XC32_VERSION, giving a numeric value to the version identifier. This macro can be used to construct applications that take advantage of new compiler features while still remaining backward compatible with older versions. The value is based upon the major and minor version numbers of the current release. For example, release version 1.03 will have a __XC32_VERSION definition of 1030. This macro can be used, in conjunction with standard preprocessor comparison statements, to conditionally include/exclude various code constructs.
__mips_dsp 1

__mips_dspr2 1

__mips_dsp_rev 2

 The C compiler defines these constants when the selected target device supports the DSPr2 engine.
__mips_micromips 1 The compiler defines these constants when we are building for the microMIPS compressed ISA as the default using the -mmicromips option.
__mips_soft_float 1 The compiler defines this constant when we are compiling for software floating-point operations.

See also the device-specific include files (pic32mx/include/proc/p32*.h) for other macros that can be used to determine the features available on the selected device. You will find these macros near the end of the header file.