RE: Help with using multilib for Cilk Library

["Iyer, Balaji V" <balaji dot v dot iyer at intel dot com>]

> -----Original Message-----
> From: Ian Lance Taylor [mailto:iant@google.com]
> Sent: Friday, July 19, 2013 6:26 PM
> To: Iyer, Balaji V
> Cc: gcc@gcc.gnu.org
> Subject: Re: Help with using multilib for Cilk Library
> 
> On Fri, Jul 19, 2013 at 11:22 AM, Iyer, Balaji V <balaji.v.iyer@intel.com> wrote:
> > Hello Everyone,
> >         I am trying to use Multilib on Cilk Library. I looked at this website
> (http://www.airs.com/ian/configure/configure_8.html) and used libsanitizer and
> libgo as samples to model after. It is currently failing with the following error
> message:
> >
> > libtool: link: /export/users/my-files/b-gcc-multilib/./gcc/xg++ -
> B/export/users/my-files/b-gcc-multilib/./gcc/ -nostdinc++ -nostdinc++ -
> I/export/users/my-files/b-gcc-multilib/x86_64-unknown-linux-gnu/32/libstdc++-
> v3/include/x86_64-unknown-linux-gnu -I/export/users/my-files/b-gcc-
> multilib/x86_64-unknown-linux-gnu/32/libstdc++-v3/include -
> I/export/users/my-files/gcc/libstdc++-v3/libsupc++ -I/export/users/my-
> files/gcc/libstdc++-v3/include/backward -I/export/users/my-files/gcc/libstdc++-
> v3/testsuite/util -L/export/users/my-files/b-gcc-multilib/x86_64-unknown-linux-
> gnu/32/libstdc++-v3/src -L/export/users/my-files/b-gcc-multilib/x86_64-
> unknown-linux-gnu/32/libstdc++-v3/src/.libs -B/export/users/my-files/install-
> gcc-multilib/x86_64-unknown-linux-gnu/bin/ -B/export/users/my-files/install-
> gcc-multilib/x86_64-unknown-linux-gnu/lib/ -isystem /export/users/my-
> files/install-gcc-multilib/x86_64-unknown-linux-gnu/include -isystem
> /export/users/my-files/install-gcc-multilib/x86_64-unknown-linux-gnu/sys-
> include  -m32 -shared -nostdlib /usr/lib/../lib/crti.o /export/users/my-files/b-
> gcc-multilib/./gcc/32/crtbeginS.o  .libs/bug.o .libs/cilk-abi.o .libs/cilk-abi-cilk-
> for.o .libs/cilk-abi-vla.o .libs/cilk-abi-vla-internal.o .libs/cilk_api.o
> .libs/cilk_fiber.o .libs/cilk_fiber-unix.o .libs/cilk_malloc.o .libs/c_reducers.o
> .libs/except-gcc.o .libs/frame_malloc.o .libs/full_frame.o .libs/global_state.o
> .libs/jmpbuf.o .libs/local_state.o .libs/metacall_impl.o .libs/os_mutex-unix.o
> .libs/os-unix.o .libs/pedigrees.o .libs/record-replay.o .libs/reducer_impl.o
> .libs/scheduler.o .libs/signal_node.o .libs/spin_mutex.o .libs/stats.o
> .libs/symbol_test.o .libs/sysdep-unix.o .libs/worker_mutex.o   -Wl,-rpath -
> Wl,/export/users/my-files/b-gcc-multilib/x86_64-unknown-linux-gnu/libstdc++-
> v3/src/.libs -Wl,-rpath -Wl,/export/users/my-files/install-gcc-multilib/lib/../lib64
> -L/export/users/my-files/b-gcc-multilib/x86_64-unknown-linux-gnu/libstdc++-
> v3/src/.libs -L/export/users/my-files/b-gcc-multilib/x86_64-unknown-linux-
> gnu/libstdc++-v3/src -lpthread -ldl -L/export/users/my-files/b-gcc-
> multilib/x86_64-unknown-linux-gnu/32/libstdc++-v3/src -L/export/users/my-
> files/b-gcc-multilib/x86_64-unknown-linux-gnu/32/libstdc++-v3/src/.libs -
> L/export/users/my-files/b-gcc-multilib/./gcc/32 -L/lib/../lib -L/usr/lib/../lib -
> L/export/users/my-files/b-gcc-multilib/./gcc /export/users/my-files/b-gcc-
> multilib/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so -lm -lc -
> lgcc_s /export/users/my-files/b-gcc-multilib/./gcc/32/crtendS.o
> /usr/lib/../lib/crtn.o  -m32 -m32   -Wl,-soname -Wl,libcilkrts.so.5 -o
> .libs/libcilkrts.so.5.0.3511
> > /export/users/my-files/b-gcc-multilib/x86_64-unknown-linux-gnu/libstdc
> > ++-v3/src/.libs/libstdc++.so: could not read symbols: File in wrong
> > format
> > collect2: error: ld returned 1 exit status
> > make[4]: *** [libcilkrts.la] Error 1
> > make[4]: Leaving directory `/export/users/my-files/b-gcc-multilib/x86_64-
> unknown-linux-gnu/32/libcilkrts'
> > make[3]: *** [multi-do] Error 1
> > make[3]: Leaving directory `/export/users/my-files/b-gcc
> >
> >
> > From what it looks like, it is reading the 64 bit library for the 32 bit mode (or
> vice-versa). How do I fix this? I am also attaching my configure.ac and
> Makefile.am. Please note that it is not fully cleaned up (e.g. I have stuff
> commented out etc). Can someone please tell me what I am doing wrong?
> 
> When building the 32bit libcillkrts you are linking against the 64-bit
> libstdc++.  It's right there on your command line:
> /export/users/my-files/b-gcc-multilib/x86_64-unknown-linux-gnu/libstdc++-
> v3/src/.libs/libstdc++.so.
>  If that argument is needed at all, it needs to be /export/users/my-files/b-gcc-
> multilib/x86_64-unknown-linux-gnu/32/libstdc++-v3/src/.libs/libstdc++.so
> (note added /32 in there).  I guess the question is where the argument is coming
> from.  I must admit that I don't know.  Is it in some environment variable?

I am not setting any environment variable that weren't set automatically in my SUSE machine. Also, all the other libs are working correctly for 32 and 64 bit.

> 
> Ian