Re: [avr-gcc-list] Add builtins in avr target.

[Andy H]

Anatoly,

__builtin_return_address is extremely useful for target error reporting. 
e.g. a function can be called(or trapped)  to report error in another 
part of program. This allows such routines to determine the address of 
the caller without using naked asm functions.

You are correct, that return address will only give 16bit pointer. But 
that covers most uses.

It would seem easier to implement than create documents and disable all 
current and future testcases that use it. That would seem to be 
confirmed by the fact that  bug reports  have been outstanding since 2005.

Of course, Eric and other AVR users may disagree.

Andy