why does Erlang define macros reserved for the C compiler?

Bengt Kleberg <>
Thu May 18 10:37:04 CEST 2006

On 2006-05-17 19:38, Matthias Lang wrote:
> I'm looking at erts/emulator/beam/sys.h.


 > Does anybody know more?

if the question included the ones above then these 2 are feature test 
macros. eg, if you want to compile a file so that it only depends upon 
posix limits (and no implementation-defined limits) you should define 


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