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Re: Help with using multilib for Cilk Library


On Fri, Jul 19, 2013 at 3:53 PM, Iyer, Balaji V <balaji.v.iyer@intel.com> wrote:
>
>
>> -----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.

OK.

> Also, all the other libs are working correctly for 32 and 64 bit.

That doesn't prove much one way or another, as the other libraries are
not written in C++.  Something is adding that explicit libstdc++.so
argument, but I don't know what.  I don't see it in your
configure/Makefile and I don't see it in the top-level
configure/Makefile either.  It could possibly be coming from libtool,
but I'm not sure how.

Ian


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