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Julien Cugnière skrev:
Anyway, here is a simple way to ensure that your constants are unique
(assuming this legal C):

   static const void* regkey1 = &regkey1;
   static const void* regkey2 = &regkey2;

No, &regkey1 is not a constant expression, although the result is constant.

I would use the __FILE__ and __LINE__ macros to get unique values,
unless space is an issue.

Something like:

#define STRINGIFY(a)	#a
#define SAPPEND(s,i)	s "" STRINGIFY(i)

static const char* unique_key = UNIQUE_KEY;

// just make sure not to have more than one key-macro per line