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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/55501] [F03] ICE using MERGE in constant expr
Date: Wed, 28 Nov 2012 09:16:00 -0000
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X-Bugzilla-Keywords: ice-on-valid-code
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55501

janus at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-11-28
                 CC|                            |janus at gcc dot gnu.org
            Summary|ICE using MERGE in constant |[F03] ICE using MERGE in
                   |expr                        |constant expr
     Ever Confirmed|0                           |1

--- Comment #2 from janus at gcc dot gnu.org 2012-11-28 09:16:13 UTC ---
I can confirm this error. It occurs with all gfortran versions I tried
(starting from 4.3 up to the current trunk). Slightly compactified test case:

module test
  type MPI_Datatype
    integer :: mpi_val
  end type
  type(MPI_Datatype) :: MPI_INTEGER = merge(MPI_Datatype(4), MPI_Datatype(8),
.false.)
end module 

Apparently the declaration needs to be in a module for the error to occur, and
also derived types need to be involved.


Using -std=f95, the test case is correctly rejected (without ICE):

type(MPI_Datatype) :: MPI_INTEGER = merge(MPI_Datatype(4), MPI_Datatype(8), .
                                     1
Error: Fortran 2003: Elemental function as initialization expression with
non-integer/non-character arguments at (1)