Martin Spott wrote:
> Can anyone give me a hint on how to determine the defines that are
> set by the compiler itself ?

With a gcc variant, you can do something like:

   echo | gcc -E -dM -

This is kinda fun, you can watch how the built-in defines changes as
you vary the optimization switches and language (g++/gcc).

More practically, this site seems to have good info, albeit not always


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