Predefined macros in C/C++ that tell you what the compiler is.

These are the predefined macros that C/C++ compilers define to tell you what compiler is being used. There are also predefined macros in C/C++ that tell you the platform, predefined macros in C/C++ that tell you the target processor and predefined macros in C/C++ that tell you what language features are available.

Compiler Macro Notes
Compiler Macro Notes
Metaware High C++ __HIGHC__
OpenWatcom __WATCOMC__ encodes the major version, minor version, and revision numbers in decimal (1210 for Watcom version 12.1.0. a.k.a. OpenWatcom 1.1, for example)
__WATCOM_CPLUSPLUS__ C++ language only, value identical to __WATCOMC__
IBM VAC++ __IBMC__ C language only
__IBMCPP__ C++ language only
DigitalMars __DMC__ encodes the version number in hexadecimal as three nybbles: major, minor, and revision (0x720 for version 7.2.0, for example)
Borland C++ __BCPLUSPLUS__ C++ language only
__BORLANDC
MSVC++ _MSC_VER encodes the major version, minor version, and revision numbers in decimal (1310 for version 13.1.0, for example)
GCC __GNUC__ defined to the major version number (minor version number in __GNUC_MINOR__ and revision in __GNUC_PATCHLEVEL__)
Clang __clang__
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