Re: bi-arch build problem: cannot build 64-bit libs on ppc64

[Maynard Johnson]

Peter O'Gorman wrote:
> Maynard Johnson wrote:
>   
> > Hi,
> > I know this topic has been discussed on the mailing list before, but
> > I've not been able to pick out all of the relevant pieces of information
> > to solve the problem for my particular situation.  Hopefully, someone on
> > the list can help.
> >
> > My platform is ppc64 SLES 10 SP1, libtool version 1.5.24.  I have a
> > project built using the standard tools -- aclocal, autoconf, automake.
> > The default configuration builds everything as 32-bit.  Prior to
> > integrating libtool into this project, I was also able to build and
> > install 64-bit programs and libraries by prefacing my ./configure
> > command with:
> >          CFLAGS="-m64" CXXFLAGS=-m64"
> >
> > I've now integrated libtool into the project.  The 32-bit build still
> > works fine, but when I try a 64-bit build (using the technique described
> > above), it fails with:
> >    gcc -m64 -o urh_int urh_int.o  /usr/lib/libbfd.so -liberty -ldl
> >    /usr/lib/libbfd.so: could not read symbols: File in wrong format
> >
> > The urh_int.o was compiled 64-bit, but /usr/lib/libbfd.so is a 32-bit
> > library.  If I manually run the above command and replace
> > '/usr/lib/libbfd.so' with '-lbfd', the 64-bit urh_int program is built
> > successfully.
> >
> > Can someone tell me the extra magic flags I need to set in order to get
> > libtool to do the right thing?
> >     
>
> Hi Maynard,
>
> There really should not be any extra magic flags. I assume that the 64
> bit libs live in a different directory that the 32 bit ones (lib64 or
>   
Yes.  For the particular failing case, the 64bit lib we need is 
/usr/lib64/libbfd.so
> lib/64 or some such). libtool should be picking this up from `gcc
> -print-multi-os-directory`.
>
> Please post ./libtool --config for both the 32 bit and 64 bit case
> (might be best to compress them).
>   
OK. Tar ball attached.
> Also, what is the libtool line for the above link line?
>   
Sorry, I should have included that the first time:

   if gcc -DHAVE_CONFIG_H -I. -I. -I..     -m64 -MT urh_int.o -MD -MP
   -MF ".deps/urh_int.Tpo" -c -o urh_int.o urh_int.c; \
   then mv -f ".deps/urh_int.Tpo" ".deps/urh_int.Po"; else rm -f
   ".deps/urh_int.Tpo"; exit 1; fi
   /bin/sh ../libtool --tag=CC --mode=link gcc  -m64   -o urh_int 
   urh_int.o -lbfd -liberty -ldl
   mkdir .libs
   gcc -m64 -o urh_int urh_int.o  /usr/lib/libbfd.so -liberty -ldl
   /usr/lib/libbfd.so: could not read symbols: File in wrong format
   collect2: ld returned 1 exit status


Thanks!
-Maynard
> Thanks,
> Peter
>

libtool_config.tar.gz
Description: GNU Zip compressed data