[Bug lto/42665] New: Internal compiler exception in with gfortran when using -fwhole-program -flto -fopenmp

["jjcogliati-r1 at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>]

When using -fwhole-program -flto -fopenmp on a program with gcc-4.5-20100107, I
get an internal compiler exception.  If I remove the -fopenmp, the program
compiles fine.  If I remove the -flto -fwhole-program, the program compiles
fine.

I have only been able to trigger this in a multi-thousand line program
proprietary program, and have not yet figured out a small test case that causes
this.  If you have any hints as to how to create a small test case, I will try
them.  I cannot provide the full program source code.  

Approximate command line:
gfortran -march=native -std=f95 -g -Wall -pedantic -O3 -Wline-truncation
-fopenmp -fbounds-check -fwhole-program -flto -o program lots.o of.o dot.o
files.o
Error:
lto1: internal compiler error: in iterative_hash_expr, at tree.c:6592


Relevant portion of gcc/tree.c:
      /* FALL THROUGH */
    default:
      tclass = TREE_CODE_CLASS (code);

      if (tclass == tcc_declaration)
        {
          /* DECL's have a unique ID */
          val = iterative_hash_host_wide_int (DECL_UID (t), val);
        }
      else
        {
          gcc_assert (IS_EXPR_CODE_CLASS (tclass));

          val = iterative_hash_object (code, val);

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/jjc/gcc/gcc45/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-4.5-20100107/configure --prefix=/home/jjc/gcc/gcc45
--enable-languages=c,c++,fortran,lto,objc --disable-multilib
Thread model: posix
gcc version 4.5.0 20100107 (experimental) (GCC)


-- 
           Summary: Internal compiler exception in with gfortran when using
                    -fwhole-program -flto -fopenmp
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jjcogliati-r1 at yahoo dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42665