RE: [avr-gcc-list] how do I pass --defsym to avr-ld?

[Schwichtenberg, Knut]

Dave,

you are using the avr-gcc to pass the parameter to the linker. Did you
try to use the linker directly with 

avr-ld --script=avr5.x --defsym=__libdatareserve=0x4 -o user user.o
bootlibentries.o

I'm not sure if the command line is okay :-(.

Knut
> -----Original Message-----
> From: 
> address@hidden
> g 
> [mailto:address@hidden
ongnu.org] On Behalf Of Dave N6NZ
> Sent: Tuesday, September 30, 2008 10:15 PM
> To: address@hidden
> Cc: AVR-GCC
> Subject: Re: [avr-gcc-list] how do I pass --defsym to avr-ld?
> 
> Now I'm even more confused.
> 
> I pass the symbol __libdatareserve in through a .o file.
> and it shows up in avr-nm output for both the .o and the resulting 
> output file.  But it still seems to be ignored by the 
> DEFINED() function.
> 
> avr-nm shows the symbol -- why doesn't DEFINED() see it????
> 
> badly need a clue here...
> 
> -dave
> 
> Dave N6NZ wrote:
> > After making many threats, I'm finally attacking the 
> problem of doing 
> > separately compiled libraries in a robust fashion.  (I can't bring 
> > myself to call them dll's since being flashed they are hardly very 
> > dynamic :)
> > 
> > I have patched the avr5.x ld script as follows, which is a 
> total of 3 
> > additional lines, all upward compatible:
> > 
> > diff -u /usr/local/atmel/avr/lib/ldscripts/avr5.x avr5.x
> > --- /usr/local/atmel/avr/lib/ldscripts/avr5.x   2007-07-27 
> > 23:12:51.000000000 -0700
> > +++ avr5.x      2008-09-30 11:53:10.000000000 -0700
> > @@ -71,6 +71,7 @@
> >    {
> >      *(.vectors)
> >      KEEP(*(.vectors))
> > +    *(.entryjumps)
> >      /* For data that needs to reside in the lower 64k of 
> progmem.  */
> >      *(.progmem.gcc*)
> >      *(.progmem*)
> > @@ -145,6 +146,7 @@
> >    }  > text
> >    .data          : AT (ADDR (.text) + SIZEOF (.text))
> >    {
> > +     . += DEFINED (__libdatareserve) ? __libdatareserve : 0 ;
> >       PROVIDE (__data_start = .) ;
> >      *(.data)
> >      *(.data*)
> > @@ -176,6 +178,7 @@
> >    }  > data
> >    .eeprom  :
> >    {
> > +    . += DEFINED(__libeepromreserve) ? __libeepromreserve : 0 ;
> >      *(.eeprom*)
> >       __eeprom_end = . ;
> >    }  > eeprom
> > 
> > My current problem revolves around the DEFINED() operator 
> in avr-ld.  It 
> > does not seem to recognize my definitions, invoked as follows:
> > 
> > avr-gcc -Wl,--script=avr5.x,--defsym=__libdatareserve=0x4 -o user \
> > user.o bootlibentries.o
> > 
> > No matter what I do, it appears as if the DEFINED() is 
> being ignored. 
> > Perhaps I misunderstand how DEFINED() is supposed to work, 
> or perhaps I 
> > misunderstand --defsym.
> > 
> > If I could solve this, then I believe I have the 
> gold-plated solution 
> > for calling separately flashed libraries (ie: reusing bootloader 
> > functions.)  I'll write that up fully after resolving this 
> annoyance.
> > 
> > -dave
> > 
> > 
> > 
> > _______________________________________________
> > AVR-GCC-list mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/avr-gcc-list
> > 
> 
> 
> 
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