[Bug fortran/43180] New: [4.5 Regression] Bad results without temporary copy of intent(in) argument

["anlauf at gmx dot de" <gcc-bugzilla at gcc dot gnu dot org>]

Hi,

my large code suddenly fails with the current gfortran, while it still works
with gfortran from fortran-dev (version 20100127).  I traced the problem
to the following part of a module where the invocation of a subroutine
as

   call set_set_v (ru(i)% c, c)  ! (notemp) Fails with current gfortran

fails (i.e., the resulting c contains bad values), while

   tmp_c = ru(i)% c              ! ("temp") Works
   call set_set_v (tmp_c, c)

works.  For details see the attached code.

I have compared the output of -fdump-tree-original of the fortran-dev
and of the trunk versions of gfortran and found that they are identical
for the "temp" variant, while there is a significant different for the
notemp variant.  Maybe someone knowledgeable can identify the cause of
the problem.


-- 
           Summary: [4.5 Regression] Bad results without temporary copy of
                    intent(in) argument
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: anlauf at gmx dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43180