Re: RE problem with gcc3.2 compiler

[Jonathan Larmour <jifl at eCosCentric dot com>]

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Ottawa Guy wrote:
> Hi Jifl 
> Yes, when I use "--gc-section" with gcc2.95 my program
> works. I am not sure what special thing happening with
> ""--gc-section" flag.
>
> Do you have any idea why this  "-Wl,--gc-sections"
> might have some effect.

I'm not familiar with the details of the sparc port, but I'd hazard a 
guess that in fact it's the compiler runtime inserting objects into the 
image. Generate a linker map for a version with or without gc-sections and 
compare the objects. Alternatively "simply" try debugging it, if necessary 
with diag_printf's or LED twiddling to see how far through the startup it 
gets (if any).

> Regarding the gcc3.x load. When I jump to 0x40001300
> my system halts. 

Is that the right address? That was only given below as what the tools 
assumed. You should use the address of the symbol "reset_vector".

Jifl

> --- Jonathan Larmour <jifl@eCosCentric.com> wrote:
>
> > Ottawa Guy wrote:
> >
> > > Thanks Jifl for your response. With the warning
> >
> > when I
> >
> > > try to run my code, my system hangs. That mean
> > > "--gc-sections" flag must be cleaning up something
> > > else.  
> >
> > You mean it works when you use -Wl,--gc-sections?
> >
> >
> > > Do you any chance have  "sparc-elf" for gcc3.x
> >
> > toolset
> >
> > > for a linux machine. I compiled the tool set on my
> > > linux machine,  I still have the same
> > > problem(constructor ordering). 
> >
> > Sorry I don't. We've recommended Jiri's site for
> > those tools since this is 
> > his port.
> >
> >
> > > I downloaded the "sparc-elf" binary file from
> > > "www.gaisler.com" website. I get the following
> >
> > error. 
> >
> > > root@ssc045 examples]# sparc-rtems-gcc hello.c
> >
> > -I./ -o
> >
> > > hello.out
> > > -I/tmp/ecos/install/include
> >
> > -L/tmp/ecos/install/lib
> >
> > > -nostdlib
> > > -Wl,--gc-sections -Ttarget.ld
> /opt/rtems/lib/gcc-lib/sparc-rtems/3.2.3/../../../../sparc-rtems/bin/ld:
>
> > > warning: cannot find entry symbol start;
> >
> > defaulting to
> >
> > > 40001300
> >
> > That may be benign, however it's meant to get the
> > start information from 
> > target.ld, e.g. in
> > hal/sparc/arch/current/src/sparc.ld:
> >
> > ENTRY(reset_vector)
> >
> > Jifl
> > --
> > eCosCentric    http://www.eCosCentric.com/    The
> > eCos and RedBoot experts
> > --["No sense being pessimistic, it wouldn't work
> > anyway"]-- Opinions==mine
>
>
>
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eCosCentric    http://www.eCosCentric.com/    The eCos and RedBoot experts
--["No sense being pessimistic, it wouldn't work anyway"]-- Opinions==mine