[Bug 865353] [NEW] OpenMPI libraries are incompatible with --as-needed in gcc's link command

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In Ubuntu 11.10 an application that links against libmpi_f77 of OpenMPI
1.5.4 or 1.4.3 built from source *FAILS* to link due to unresolvable
relocations:

program main
include 'mpif.h'
integer ierr
call mpi_init(ierr)
end

marcusmae at loveland:~/Programming/mpitest$ mpif90 -g mpitest.f90
/usr/bin/ld: /tmp/cc3NLduM.o(.debug_info+0x542): unresolvable
R_X86_64_64 relocation against symbol `mpi_fortran_argv_null_'
/usr/bin/ld: /tmp/cc3NLduM.o(.debug_info+0x55c): unresolvable
R_X86_64_64 relocation against symbol `mpi_fortran_argv_null_'
/usr/bin/ld: /tmp/cc3NLduM.o(.debug_info+0x5d2): unresolvable
R_X86_64_64 relocation against symbol `mpi_fortran_errcodes_ignore_'
/usr/bin/ld: /tmp/cc3NLduM.o(.debug_info+0x5ec): unresolvable
R_X86_64_64 relocation against symbol `mpi_fortran_errcodes_ignore_'

The solution is to remove --as-needed from the linker command line in
gcc specs.

This issue is also described in http://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=608901

** Affects: binutils (Ubuntu)
     Importance: Undecided
         Status: New

-- 
OpenMPI libraries are incompatible with --as-needed in gcc's link command
https://bugs.launchpad.net/bugs/865353
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