Re: linker --relax option with debug info

[Nick Clifton <nickc at redhat dot com>]

Hi Swami,

> > the problem(s) may be found.  (I spent a lot of time fixing the 
> > MN10300 port to work with -g and --relax).
> >   
> Is the process/fix complex?

Moderately so.  If I remember correctly you have to make sure that the 
assembler does not do some things, like resolving the distance between 
two symbols, even if they are in the same section.  (Ie you need to 
define md_alloc_local_subtract).  You should also disable call frame 
optimizations when linker relaxation is enabled (md_allow_eh_opt).

You will also need to make sure that alignment requests are passed on to 
the linker and not just resolved in the assembler.  So you will need to 
define the HANDLE_ALIGN macro and create a reloc for alignment requests.

Then in the BFD code you must make sure that the alignment relocs are 
honoured when relaxing.  Also look out for a special case when relaxing 
offsets in a DWARF2 location list.  Search for .debug_loc in 
elf-m10300.c to find out more about this.

Cheers
  Nick