[Bug debug/20998] New: GCC does not emit debug info for variables in anonymous unions

[Bug debug/20998] New: GCC does not emit debug info for variables in anonymous unions

[dpatel at apple dot com]

Here  is the simple C++ program :

int main()                                                                                                                                                                                           
{                                                                                                                                                                                                    
  union {                                                                                                                                                                                            
    int z;                                                                                                                                                                                           
    unsigned int w;                                                                                                                                                                                  
  }; w = 0;                                                                                                                                                                                          
                                                                                                                                                                                                     
}

-- 
           Summary: GCC does not emit debug info for variables in anonymous
                    unions
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dpatel at apple dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] GCC does not emit debug info for variables in anonymous unions

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-04-13 18:18 -------
Confirmed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-04-13 18:18:01
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] GCC does not emit debug info for variables in anonymous unions

[dpatel at apple dot com]

------- Additional Comments From dpatel at apple dot com  2005-04-13 18:19 -------
Subject: Re:  GCC does not emit debug info for variables in anonymous unions

It is because of ALIAS_DECL



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-04-13 18:21 -------
This is a regression from 3.3.3.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-debug
      Known to fail|                            |3.4.0 4.0.0 4.1.0
      Known to work|                            |3.3.3
            Summary|GCC does not emit debug info|[3.4/4.0/4.1 Regression] GCC
                   |for variables in anonymous  |does not emit debug info for
                   |unions                      |variables in anonymous
                   |                            |unions
   Target Milestone|---                         |3.4.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[mmitchel at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4.4                       |3.4.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-07-12 06:06 -------
(In reply to comment #2)
> It is because of ALIAS_DECL
Which means it was caused by:
2002-12-18  Jason Merrill  <jason@redhat.com>
        
        Handle anonymous unions at the tree level.
        C++ ABI change: Mangle anonymous unions using the name of their
        first named field (by depth-first search).  Should not cause
        binary compatibility problems, though, as the compiler previously
        didn't emit anything for affected unions.
        * cp-tree.def (ALIAS_DECL): New tree code.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-07-22 21:13 -------
Moving to 4.0.2 pre Mark.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4.5                       |4.0.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[rth at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rth at gcc dot gnu dot org
                   |dot org                     |
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2005-04-13 18:18:01         |2005-09-09 07:13:15
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[dpatel at apple dot com]

------- Additional Comments From dpatel at apple dot com  2005-09-09 18:01 -------
Subject: Re:  [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions


It does not fix gdb.cp/anon-union.exp (from GDB testsuite) failures  
using darwin GDB. If you do not get any other feedback/info then I'll  
try to get back to this next week.

-
Devang



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[rth at gcc dot gnu dot org]

------- Additional Comments From rth at gcc dot gnu dot org  2005-09-09 19:08 -------
Well it does with cvs head gdb on linux, both stabs and dwarf2.  If you'll
verify that you see something akin to 

        .stabs  "z:(0,7)",128,0,0,-4
        .stabs  "w:(0,9)",128,0,0,-4

in your assembly file, I'll close this as fixed on the gcc side.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-09 20:37 -------
I get:
        .stabs  "z:(0,9)",128,0,6,24
        .stabs  "w:(0,11)",128,0,6,24

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-09 20:44 -------
(In reply to comment #9)
> I get:
>         .stabs  "z:(0,9)",128,0,6,24
>         .stabs  "w:(0,11)",128,0,6,24

After updating my gcc to the today's mainline instead of one from yesterday, darwin's gdb works 
correctly for me.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[rth at gcc dot gnu dot org]

------- Additional Comments From rth at gcc dot gnu dot org  2005-09-09 21:06 -------
Fixed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-09-09 21:06 -------
Subject: Bug 20998

CVSROOT:	/cvs/gcc
Module name:	gcc
Branch: 	gcc-4_0-branch
Changes by:	rth@gcc.gnu.org	2005-09-09 21:05:57

Modified files:
	gcc            : ChangeLog Makefile.in dbxout.c 
	gcc/cp         : ChangeLog cp-tree.def decl2.c error.c 
	                 name-lookup.c semantics.c 

Log message:
	PR debug/20998
	* dbxout.c: Include expr.h.
	(dbxout_global_decl): Don't suppress for DECL_RTL unset.
	(dbxout_symbol): Handle DECL_VALUE_EXPR.
	* Makefile.in (dbxout.o): Add EXPR_H.
	cp/
	* cp-tree.def (ALIAS_DECL): Remove.
	* cp-lang.c (cp_init_ts): Remove support for it.
	* error.c (dump_decl): Likewise.
	* name-lookup.c (pushdecl): Likewise.
	* semantics.c (finish_id_expression): Likewise.
	* decl2.c (build_anon_union_vars): Use a VAR_DECL with
	DECL_VALUE_EXPR instead.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=2.7592.2.422&r2=2.7592.2.423
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/Makefile.in.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.1447.2.4&r2=1.1447.2.5
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/dbxout.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.221.2.2&r2=1.221.2.3
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.4648.2.97&r2=1.4648.2.98
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/cp-tree.def.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.94.4.3&r2=1.94.4.4
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/decl2.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.770.2.7&r2=1.770.2.8
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/error.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.279.2.2&r2=1.279.2.3
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/name-lookup.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.109.4.8&r2=1.109.4.9
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/semantics.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.463.2.9&r2=1.463.2.10



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998

[Bug debug/20998] [3.4/4.0/4.1 Regression] GCC does not emit debug info for variables in anonymous unions

[rth at gcc dot gnu dot org]

------- Additional Comments From rth at gcc dot gnu dot org  2005-09-09 21:07 -------
Oh, and that's a WONTFIX for 3.4, in case anyone's interested.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20998