IBM/Absoft bug on Mac OS-X

From: David Sagan (dcs16_at_cornell.dot.edu)
Date: 03/07/05 

Date: Mon, 07 Mar 2005 10:02:46 -0500

Hello:

I have run across a bug using the IBM and Absoft compilers (the latest
versions) on Mac OS-X (10.3) and I am wondering whether anyone else
knows anything about this. To see the bug consider the following test
files:

!-------------------------------
! This is a file: test_mod.f

module test_mod

type my_struct
   integer :: iii = 27
endtype
type (my_struct), save :: my

contains

subroutine test_in_mod
   print *, 'In Module:', my%iii
end subroutine

end module
!-------------------------------

!-------------------------------
! This is a file: test.f

program test
   use test_mod
   implicit none
   print *, 'In Main:', my%iii
! call test_in_mod
end program
!-------------------------------

The bug appears when test_mod.f is put in a library and test.f is linked
against it:

mc66:~/Bmad/bmad_dist/bug_lib_ibm> xlf90 -c test_mod.f
** test_mod === End of Compilation 1 ===
1501-510 Compilation successful for file test_mod.f.

mc66:~/Bmad/bmad_dist/bug_lib_ibm> ar -r libtest_mod.a test_mod.o

mc66:~/Bmad/bmad_dist/bug_lib_ibm> ranlib libtest_mod.a

mc66:~/Bmad/bmad_dist/bug_lib_ibm> xlf90 test.f -L. -ltest_mod
** test === End of Compilation 1 ===
1501-510 Compilation successful for file test.f.

mc66:~/Bmad/bmad_dist/bug_lib_ibm> ./a.out
  In Main: 0

This is wrong. Uncommenting out the "call test_in_mod" makes the program
produce the correct result. Someone in my lab suspects that it is due to
the ld loader. Anyone have any information on this?

               -- Thanks, David

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