[Bug target/19087] Overflowed address in dwarf debug line information

["dwatkins at tascsystems dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From dwatkins at tascsystems dot com  2005-02-16 00:04 -------
Regarding this bug and AVRFreaks Forum topic:

http://www.avrfreaks.com/index.php?
name=PNphpBB2&file=viewtopic&t=23436&highlight=&sid=e1dbd9f208947a5efc679075b4af
f237

in which the debug info for code past the first 64k of program space wraps, 
overlaying the information at the lower 64k, I may have identified the 
problem.  It appears that using POINTER_SIZE = 16 results in DWARF2_ADDR_SIZE 
being derived as 2 when it should be 4.  This would normally not be an issue 
except that in code generation the pointers appear to address 64k words (128k 
bytes), but for debug info the address fields appears to address program space 
in bytes, thus wrapping for the second 64k when the address field size is 16 
bits.

I rebuilt GCC with the following change added to gcc/config/avr/avr.h just 
after the define for POINTER_SIZE...

#define DWARF2_ADDR_SIZE 4

GCC rebuilt, and my AVR libraries and project all rebuilt, but at this point, 
when attempting to load it into AVRStudio4.11, it results in a rather dramtic 
looking Visual C++ runtime error from AVRStudio.exe.

I obviously don't have a fix, but perhaps someone more familiar will recognize 
what I attempted to do and know what further needs to be done to both resolve 
the problem and retain interoperability with AS4.

Regards,

Darcy

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19087