What do the __CC_ARM, __ICCARM__, __GNUC__ and __TASKING__ macros mean?

Question

I am working on STM32l151rct6a by stm, I have stumbled upon these MACRO definitions

__CC_ARM, __ICCARM__, __GNUC__, __TASKING__

Does anyone kno

Answer 1

They are macros for identifying the compiler being used to build the code.

A list of such macros, and others for identifying architecture and OS etc. can be found at http://sourceforge.net/p/predef/wiki/Home/. It does not however comprehensively cover many compilers from smaller embedded systems vendors (Tasking and Imagecraft for example).