[Bug c++/14167] Unneeded C++ types are output in debug info due to use of static constants

[Bug c++/14167] Unneeded C++ types are output in debug info due to use of static constants

[drow at gcc dot gnu dot org]

------- Comment #3 from drow at gcc dot gnu dot org  2006-01-21 16:27 -------
I don't have G++ 3.4 handy at the moment.  3.3 emits about three and a half
times as large of a .debug_info section as 4.0, however, so I believe this is
fixed.

There's still lots of unneeded debug information output, but I believe I've got
another open PR describing that.


-- 

drow at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14167

[Bug c++/14167] Unneeded C++ types are output in debug info due to use of static constants

[drow at gcc dot gnu dot org]

------- Comment #4 from drow at gcc dot gnu dot org  2006-01-21 16:37 -------
Oops, not so clear after all.

Debug information for Class1 is no longer emitted, but debug information for
Class1::var1 is still emitted.  It just doesn't trigger the output of the
containing class any more.

If I add a real use of var1:

class Class1 {
public:
  static const int var1 = 1;
  static const int var2 = var1;
};

class Class2 {
  static const int var1 = 1;
  static const int var2 = 1;
};

int main(void)
{
  return Class1::var1;
}

Still no change.  We get a declaration for var1, but no definition for it, and
not even a declaration of the containing class.  It looks like this:

 <1><244>: Abbrev Number: 5 (DW_TAG_variable)
     DW_AT_name        : var1
     DW_AT_decl_file   : 1
     DW_AT_decl_line   : 3
     DW_AT_MIPS_linkage_name: _ZN6Class14var1E
     DW_AT_type        : <219>
     DW_AT_external    : 1
     DW_AT_declaration : 1
     DW_AT_const_value : 1

That's pretty useless.  It doesn't let a debugger print Class1::var1.


-- 

drow at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14167

[Bug c++/14167] Unneeded C++ types are output in debug info due to use of static constants

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEW


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14167

[Bug c++/14167] Unneeded C++ types are output in debug info due to use of static constants

[jason at gcc dot gnu dot org]

------- Comment #5 from jason at gcc dot gnu dot org  2006-08-22 19:34 -------
[basic.def.odr] says that an object that appears in an integral constant
expression is not thereby "used", and it seems reasonable to extend that to not
setting TREE_USED.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14167

[Bug c++/14167] Unneeded C++ types are output in debug info due to use of static constants

[drow at gcc dot gnu dot org]

------- Comment #6 from drow at gcc dot gnu dot org  2006-08-22 20:03 -------
The use in main should still set TREE_USED, though; should TREE_USED on a
member ought to cause the class to be emitted?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14167

[Bug c++/14167] Unneeded C++ types are output in debug info due to use of static constants

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-05-12 02:06 -------
I think this has now been fixed (I tried to reproduce this with the testcase but I don't know if I did the 
correct thing to check).

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14167

[Bug c++/14167] Unneeded C++ types are output in debug info due to use of static constants

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
   Last reconfirmed|2004-05-19 19:59:32         |2004-08-11 22:09:57
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14167

[Bug c++/14167] Unneeded C++ types are output in debug info due to use of static constants

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-02-17 05:07 -------
Confirmed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-02-17 05:07:39
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14167