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

[Matthias Klose]

looks like an issue with ld.bfd. you can work around it by using gold
for now.

  mpif90 -B/usr/lib/gold-ld -g mpitest.f90


** Package changed: gcc-4.6 (Ubuntu) => binutils (Ubuntu)

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https://bugs.launchpad.net/bugs/865353

Title:
  OpenMPI libraries are incompatible with --as-needed in gcc's link
  command

Status in “binutils” package in Ubuntu:
  New

Bug description:
  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

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