[avr-gcc-list] GDB gets line numbers wrong. Help!

[Scott Finneran]

Hello everyone,

Apologies if this seems a little off-topic. I am currently experiencing
a problem with gdb-5.0 (patched for the AVR). It seems that GDB is
unable to correctly align program space addresses with source lines.
Running with -O0 does of course help a little but certainly does not fix
the problem entirely.

We are not talking about minor errors either. Quite often, GDB will say
that a program address corresponds to a line number > the length of the
source file. This also occurs regardless of whether the source contains
C or C++ or a combination of the two.

Even some help determining if the fault lies in GCC/G++ producing the
elf files or in GDB reading them would be greatly appreciated.
(avr-objdump isn't really appropriate for this as it may contain the
same bug!)

In case my mistake lies in a selection of my cmd-line args, source file
compilations look like this:
cook: avr-gcc -I./library/hdr -Ibl/library/hdr -Iblbl/library/hdr
        -Iblblbl/library/hdr -I/usr/local/include -I. -Ibl -Iblbl -Iblblbl
        -I./flasher/hdr -Ibl/flasher/hdr -Iblbl/flasher/hdr
        -Iblblbl/flasher/hdr -I./ucosii/hdr -Ibl/ucosii/hdr -Iblbl/ucosii/hdr
        -Iblblbl/ucosii/hdr -I/usr/local/avr/include -D__AVR_ATmega128__
        -DOS_UCOSII -Wa,-gstabs -mmcu=atmega128 -g -O0 -Wall -Werror
        -save-temps -c flasher/src/main.c
        -Wa,-ahl=flasher/src/ATmega128-ucos/main.lst -o
        flasher/src/ATmega128-ucos/main.o

...and linker command-line looks like this:
cook: avr-g++ -Wl,--cref -mmcu=atmega128 --verbose -t -fno-rtti
-fno-exceptions
        -T flasher/script/avrmega128.x -L./ucosii/ATmega128-ucos
        -Lbl/ucosii/ATmega128-ucos -Lblbl/ucosii/ATmega128-ucos
        -Lblblbl/ucosii/ATmega128-ucos -L./avr/ATmega128-ucos
        -Lbl/avr/ATmega128-ucos -Lblbl/avr/ATmega128-ucos
        -Lblblbl/avr/ATmega128-ucos -L./ucosii/ATmega128-ucos
        -Lbl/ucosii/ATmega128-ucos -Lblbl/ucosii/ATmega128-ucos
        -Lblblbl/ucosii/ATmega128-ucos -L./library/ATmega128-ucos
        -Lbl/library/ATmega128-ucos -Lblbl/library/ATmega128-ucos
        -Lblblbl/library/ATmega128-ucos -L./smartcpp/ATmega128-ucos
        -Lbl/smartcpp/ATmega128-ucos -Lblbl/smartcpp/ATmega128-ucos
        -Lblblbl/smartcpp/ATmega128-ucos -L/usr/local/avr/lib/avr5
        /usr/local/avr/lib/avr5/crtm128.o flasher/src/ATmega128-ucos/main.o
        -lavr -lucosii -llibrary -lsmartcpp -lucosii -lavr -lucosii -llibrary
        -lsmartcpp -lc -lgcc -nostdlib
        -Wl,-Map,bin/flasher/ATmega128-ucos/rom.map
        -obin/flasher/ATmega128-ucos/rom.elf

Thanks in advance,

Scott