debug/8818: g++ 3.3: missing label definition in debug output

debug/8818: g++ 3.3: missing label definition in debug output

[snyder]

>Number:         8818
>Category:       debug
>Synopsis:       g++ 3.3: bad assembly code when optimizing (reference to undefined label)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Wed Dec 04 20:36:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     scott snyder
>Release:        3.3 20021203 (experimental)
>Organization:
>Environment:
System: Linux karma 2.4.19-emp_2419p5a829i #1 Tue Sep 3 17:42:17 EST 2002 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc/configure --prefix=/usr/local/gcc --enable-threads=posix --enable-long-long --enable-languages=c,c++,f77
>Description:

When the following source is compiled on linux/x86
with the flags `-fPIC -g -O1', the assembly code contains a reference
to the label `.LC0', which is nowhere defined.  Removing any of these
three switches makes the problem go away.

$ cc1plus -quiet -fPIC -g -O1 x.cc
$ grep LC0 x.s
	.long	.LC0
$

This then causes a link error.

It looks like this reference is part of the debug information.


>How-To-Repeat:

---------------------------------------------
struct RefCounter {
  RefCounter() ;
};

struct ObjDouble  : public RefCounter
{
  ObjDouble(double value) : _value(value) { }
  double _value;
};

int main() {
  double bfield = 2.2;
  new ObjDouble(-bfield);
  new ObjDouble(-bfield);
  return 0;
}

---------------------------------------------

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: