[Bug 697229]

[Hjl-tools]

A small testcase:

hjl at gnu-6 pr13250]$ cat foo.c
char mpi_fortran_argv_null_[8];
[hjl at gnu-6 pr13250]$ cat bar.c
extern char mpi_fortran_argv_null_[8];

int
bar ()
{
 return mpi_fortran_argv_null_[0];
}
[hjl at gnu-6 pr13250]$ cat main.c
char mpi_fortran_argv_null_[1];

extern int bar ();

int
main ()
{
  bar ();
  return 0;
}
[hjl at gnu-6 pr13250]$ make
gcc -g   -c -o main.o main.c
gcc -shared -fPIC -g -o libfoo.so foo.c
gcc -shared -fPIC -g -o libbar.so bar.c libfoo.so
gcc -Wl,--as-needed -o x main.o libbar.so libfoo.so -Wl,-rpath,.
/usr/local/bin/ld: main.o(.debug_info+0x7e): unresolvable R_X86_64_64 relocation against symbol `mpi_fortran_argv_null_'
./x
[hjl at gnu-6 pr13250]$

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https://bugs.launchpad.net/bugs/697229

Title:
  openmpi link failure with ld --as-needed

Status in binutils:
  Confirmed
Status in “binutils” package in Ubuntu:
  Confirmed
Status in “openmpi” package in Ubuntu:
  Confirmed
Status in “openmpi” package in Debian:
  New

Bug description:
  $ cat test.F
        program main
         include 'mpif.h'
         integer ierr
         call mpi_init(ierr)
        end
  $ mpif90 test.F -Wl,--as-needed -Wall -Wno-unused-variable -g   -I/usr/lib/openmpi/include -I/usr/lib/openmpi/lib -L/usr/lib/openmpi/lib -L/usr/lib/gcc/i686-linux-gnu/4.5.2 -ldl -lmpi -lopen-rte -lopen-pal -lnsl -lutil -lgcc_s -lpthread -ldl        /usr/bin/ld: /tmp/cccq3IWF.o(.debug_info+0x48d): unresolvable R_X86_64_64 relocation against symbol `mpi_fortran_argv_null_'
  /usr/bin/ld: /tmp/cccq3IWF.o(.debug_info+0x4a7): unresolvable R_X86_64_64 relocation against symbol `mpi_fortran_argv_null_'
  /usr/bin/ld: /tmp/cccq3IWF.o(.debug_info+0x511): unresolvable R_X86_64_64 relocation against symbol `mpi_fortran_errcodes_ignore_'
  /usr/bin/ld: /tmp/cccq3IWF.o(.debug_info+0x52b): unresolvable R_X86_64_64 relocation against symbol `mpi_fortran_errcodes_ignore_'

  works with --no-as-needed.

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