[Bug fortran/17917] New: gfortran ICE on "equivalence"

["olchansk at panix dot com" <gcc-bugzilla at gcc dot gnu dot org>]

In "gcc version 4.0.0 20041009 (experimental)", the "equivalence" statement no
longer works. (I think it used to work). This is what I get:

[olchansk@tw15 gfortran_test]$ cat test_equiv.f90
module test_equiv
  implicit none
  private

  real    a(100)
  integer b(100)

  ! Following error, unless "equivalence" is removed:
  ! /triumfcs/trshare/olchansk/gcc-tree-ssa/install/bin/gfortran -x f95 -c  -o
test_equiv.o -O2 -g -Wall -Waliasing -Wline-truncation -Wsurprising
-Wunused-labels -fPIC -ffixed-line-length-132 test_equiv.f90
  ! test_equiv.f90:0: internal compiler error: backend decl for module variable
a already exists
  ! Please submit a full bug report,
  ! with preprocessed source if appropriate.
  ! See <URL:http://gcc.gnu.org/bugs.html> for instructions.

  equivalence (a(1),b(1))
  
end module test_equiv

[olchansk@tw15 gfortran_test]$ make test_equiv.o
/triumfcs/trshare/olchansk/gcc-tree-ssa/install/bin/gfortran -x f95 -c  -o
test_equiv.o -O2 -g -Wall -Waliasing -Wline-truncation -Wsurprising
-Wunused-labels -fPIC -ffixed-line-length-132 test_equiv.f90
Warning: test_equiv.f90:9: Line is being truncated
test_equiv.f90:0: internal compiler error: backend decl for module variable a
already exists
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
make: *** [test_equiv.o] Error 1

[olchansk@tw15 gfortran_test]$
/triumfcs/trshare/olchansk/gcc-tree-ssa/install/bin/gfortran -v
Reading specs from
/triumfcs/trshare/olchansk/gcc-tree-ssa/install-20041008/lib/gcc/i686-pc-linux-gnu/4.0.0/specs
Configured with: ../gcc/configure
--prefix=/triumfcs/trshare/olchansk/gcc-tree-ssa/install-20041008
--with-mpfr-dir=/triumfcs/trshare/olchansk/gcc-tree-ssa/mpfr/mpfr-2.0.3
--with-gmp-dir=/triumfcs/trshare/olchansk/gcc-tree-ssa/mpfr/gmp-4.1.3
--enable-languages=c,f95
Thread model: posix
gcc version 4.0.0 20041009 (experimental)

K.O.

-- 
           Summary: gfortran ICE on "equivalence"
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: fortran
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: olchansk at panix dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17917