I just noticed that the binary is being built even though gcc throws
the assertion failures. Should I be concerned about these?
Jerin
On Mon, Oct 26, 2009 at 2:24 PM, JJ <alchemistmba@xxxxxxxxx> wrote:
> Thanks Ian,
>
> Removing the -nostdlibs and -nodefaultfiles and adding the following
> sections to the linker script fixed the undefined symbols and multiple
> declaration of _start issues.
>
> .data : { *(.data) }
> __exidx_start = .;
> .ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) }
> __exidx_end = .;
>
> I'm left with the assertion failures:
> $ /tools/.../arm-none-linux-gnueabi-g++ -static -nostartfiles -T
> temp.ld -o output_program start.o abc.o xyz.o
> /tools/../lib/gcc/arm-none-linux-gnueabi/4.3.2/../../../../arm-none-linux-gnueabi/bin/ld:
> BFD (Sourcery G++ Lite 2008q3-41) 2.18.50.20080215 as
> sertion fail /scratch/../linux/obj/binutils-src-2008q3-41-arm-none-linux-gnueabi-i686-pc-linux-gnu/bfd/elf.c:3916
> /tools/../lib/gcc/arm-none-linux-gnueabi/4.3.2/../../../../arm-none-linux-gnueabi/bin/ld:
> BFD (Sourcery G++ Lite 2008q3-41) 2.18.50.20080215 as
> sertion fail /scratch/../linux/obj/binutils-src-2008q3-41-arm-none-linux-gnueabi-i686-pc-linux-gnu/bfd/elf.c:3916
>
> JJ
>
>
>
> On Mon, Oct 26, 2009 at 1:05 PM, Ian Lance Taylor <iant@xxxxxxxxxx> wrote:
>> JJ <alchemistmba@xxxxxxxxx> writes:
>>
>>> unwind-arm.c:(.text+0x72c): undefined reference to `__exidx_end'
>>> unwind-arm.c:(.text+0x730): undefined reference to `__exidx_start'
>>
>> These and the other undefined symbols are intended to be defined by
>> the linker script. run ...-ld --verbose to see the default linker
>> script, and incorporate that stuff into your linker script.
>>
>>
>>> I also want to rewrite the "_start" function in assembly. If I add
>>> this file in, g++ complains that _start is defined twice. Is there a
>>> way to do this?
>>
>> You'll need to use -nostartfiles and figure out what you need to
>> replace everything other than _start.
>>
>> Or I suppose you could use ENTRY in your linker script to start your
>> program at something other than _start.
>>
>> Ian
>>
>
