debug/9039: ICE, anonymous union, gen_decl_die, dwarf2out.c:11974

debug/9039: ICE, anonymous union, gen_decl_die, dwarf2out.c:11974

[mec]

>Number:         9039
>Category:       debug
>Synopsis:       ICE, anonymous union, gen_decl_die, dwarf2out.c:11974
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 22 16:46:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     mec@shout.net
>Release:        gcc HEAD%20021221
>Organization:
>Environment:
target = native
host = i686-pc-linux-gnu (red hat linux 8)
gcc = gcc HEAD%20021221
binutils = 2.13.1
gformat = dwarf-2

I checked out gcc HEAD from :pserver:anoncvs:@subversions.gnu.org:/cvsroot/gcc.  My checkout started at 2002-12-21T16:26:28Z and ended at 2002-12-21T16:30:31Z.  Unfortunately, I'm not running ntp, so those nice timestamps are actually 5-10 minutes slow.

>Description:
g++ gives an ICE on a small function with an anonymous union when generateing dwarf-2 debugging information.

The code is:

  int foo()
  {
    union
    {
      int z;
      unsigned int w;
    };

    w = 0;
    return 0;
  }


>How-To-Repeat:
Compiler invocation line:

  gcc -v -S -gdwarf-2 z1.cc > z1.out 2>&1 z1.out

The file attachment has the exact output from "z1.out" along with a copy of the source code and essentiallly all the information from this form.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="REPORT.txt"
Content-Disposition: inline; filename="REPORT.txt"

anon-union-ice
Michael Chastain, <mec@shout.net>
2002-12-22

Synopsis:

  ICE, anonymous union, gen_decl_die, dwarf2out.c: 11974

Configuration:

  target   = native
  host     = i686-pc-linux-gnu (red hat linux 8)
  gcc      = gcc HEAD%20021221
  binutils = 2.13.1
  gformat  = dwarf-2

  I downloaded gcc HEAD with a cvs checkout command which started
  at 2002-12-21T16:26:28Z and ended at 2002-12-21T16:30:31Z.
  (Unfortunately, I'm not running ntp, and my clock is about five
  minutes fast right now, which fuzzes up my nice time markers).

Compiler invocation line:

  gcc -v -S -gdwarf-2 z1.cc > z1.out 2>&1

Compiler output:

  Reading specs from /berman/fsf/_today_/berman/native/install/gcc/gcc-HEAD-binutils-2.13.1/lib/gcc-lib/i686-pc-linux-gnu/3.4/specs
  Configured with: 
  Thread model: posix
  gcc version 3.4 20021221 (experimental)
   /berman/fsf/_today_/berman/native/install/gcc/gcc-HEAD-binutils-2.13.1/lib/gcc-lib/i686-pc-linux-gnu/3.4/cc1plus -quiet -v -D__GNUC__=3 -D__GNUC_MINOR__=4 -D__GNUC_PATCHLEVEL__=0 -D_GNU_SOURCE z1.cc -D__GNUG__=3 -quiet -dumpbase z1.cc -auxbase z1 -gdwarf-2 -version -o z1.s
  GNU C++ version 3.4 20021221 (experimental) (i686-pc-linux-gnu)
	  compiled by GNU C version 3.2.1.
  ignoring nonexistent directory "/berman/fsf/_today_/berman/native/install/gcc/gcc-HEAD-binutils-2.13.1/i686-pc-linux-gnu/include"
  #include "..." search starts here:
  #include <...> search starts here:
   /berman/fsf/_today_/berman/native/install/gcc/gcc-HEAD-binutils-2.13.1/include/c++/3.4
   /berman/fsf/_today_/berman/native/install/gcc/gcc-HEAD-binutils-2.13.1/include/c++/3.4/i686-pc-linux-gnu
   /berman/fsf/_today_/berman/native/install/gcc/gcc-HEAD-binutils-2.13.1/include/c++/3.4/backward
   /usr/local/include
   /berman/fsf/_today_/berman/native/install/gcc/gcc-HEAD-binutils-2.13.1/include
   /berman/fsf/_today_/berman/native/install/gcc/gcc-HEAD-binutils-2.13.1/lib/gcc-lib/i686-pc-linux-gnu/3.4/include
   /usr/include
  End of search list.
  z1.cc: In function `int foo()':
  z1.cc:11: internal compiler error: in gen_decl_die, at dwarf2out.c:11974
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

Contents of z1.cc:

  int foo()
  {
    union
    {
      int z;
      unsigned int w;
    };

    w = 0;
    return 0;
  }