RE: Can't build gcc-2.95.3 with g++ for m68k-elf

["Fritz, Wolfgang" <Wolfgang dot Fritz at datentechnik dot com>]

> -----Original Message-----
> From: Kai Ruottu [mailto:kai.ruottu@luukku.com]
> Sent: Tuesday, February 12, 2002 4:19 PM
> To: Wolfgang Fritz
> Cc: crossgcc@sources.redhat.com
> Subject: Re: Can't build gcc-2.95.3 with g++ for m68k-elf
> 
> 
> Wolfgang Fritz wrote:
> > 
> > For my "real life" applications I have one problem that I 
> couldn't solve
> > up to now. I have one application which needs a special 
> linker script
> > which is conflicting with the default linker script from 
> the specs file.
> > I have the following entry in the specs file:
> > 
> > *link:
> > %{!T:-T dt.ld%s}
> > 

I got that from a configuration file in the gcc-2.95.3 gcc/config
directory (don't remember what target)

> > which LOOKS to me as it would mean "If there are no -T 
> options on the
> > linker command line, use the default dt.ld, otherwise 
> don't". That is
> > what I want. But dt.ld is always used, and my special 
> application gives
> > nice error messages during the link.
> 
>  The 'specs' file will be read by 'gcc', not by 'ld', so the 
> logic goes:
> "If there are no -T options on the gcc command line, put the 
> option '-T dt.ld%s'
> onto the 'ld' command line, otherwise don't"...  But 'gcc' 
> wouldn't understand
> the '-T' option because it is a option for 'ld'... So the 
> right way is to put :
> 
> 	*link:
> 	%{!Wl,-T*:-T dt.ld%s}
> 
That sounds logical, but it does not work :-( It is the same as before:
dt.ld is always used, and I get an linker error like "cannot move
location counter backwards".

I tried some other variations of that spec like
%{!Wl,-T:-T dt.ld%s}
%{!Wl*:-T dt.ld%s}
but they didn't work either.

Up to now I have not found any docs about spec file syntax, and I think
I have to find the location of the spec file processing in the gcc
sources :-(

Wolfgang


> there, because the linker options are given using the 
> '-Wl,<ld_options>'
> on the 'gcc' command line...
> 
> Cheers, Kai
> 
> 
> 
> > 
> > I could not find documentation about the specs entries (I'll keep on
> > searching). Is ther a solution for this problem which I 
> would imagine is
> > a common one in embedded systems with differing memory layouts etc.
> > 
> > Wolfgang
> > 
> > > Regards, Kai
> > >
> > > ------
> > > Want more information?  See the CrossGCC FAQ, 
http://www.objsw.com/CrossGCC/
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crossgcc-unsubscribe@sources.redhat.com
> 
> ------
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