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

[Maynard Johnson]

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?

Thanks in advance.

-Maynard